Ten Feet Coal (Ingleton)
type: Concept
in scheme: NamedRockUnit
alternative label: 10FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 10FT COAL
broader: PMCM

Twelfth Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: 12LS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
broader: NE

Helm Member
type: Concept
in scheme: NamedRockUnit
alternative label: 1HELM
has current status: CURRENT
has theme: BEDRCK
notation: Helm
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: SO
has youngest age: SO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38139
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38140
has lithology component: 1HELM CONGMF
has lithology component: 1HELM MDST
has lithology component: 1HELM SDST
has lithology component: 1HELM SLST
has source info: 1HELM 49352
has source info: 1HELM 52741
has source info: 1HELM 52930
broader: KMF
has additional age information: Pridoli, Late Silurian.
has lower boundary definition: Base of the lowest reddened laminated siltstone unit where it overlies thickly bedded, unreddened, coarse- to medium-grained sandstone forming the lower part of the Kirkby Moor Formation.
has geographical distribution: Restricted to The Helm and its immediate vicinity.
has lithology description: Laminated siltstone and mudstone with thinly interbedded, fine-grained sandstone that is pervasively reddened.
has thickness description: About 250m
has upper boundary definition: Base of the lowest thick and unreddened sandstone bed from the upper part of the Kirkby Moor Formation.

First St John's Coal (South Yorkshire And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: 1SJC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 1SJC COAL
broader: PMCM

Twenty Inch Coal (Forest Of Dean)
type: Concept
in scheme: NamedRockUnit
alternative label: 20CO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: 20CO COAL
broader: NE

27 Yard Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: 27YD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 27YD COAL
broader: PMCM

Second Ell Sill
type: Concept
in scheme: NamedRockUnit
alternative label: 2ES
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
broader: NE

Two Feet Six Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2F6C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: 2F6C COAL
broader: LLFB

Two-Feet Nine Coal, Four-Feet Coal And Six-Feet Coal (Undifferentiated) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2F946
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2F946 COAL
broader: SWMCM

Two-Feet Nine Coal And Four-Feet Coals (Undifferentiated) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2F94F
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2F94F COAL
broader: SWMCM

Two-Feet-Nine Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2F9C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2F9C COAL
has lateral equivalent: 2F9C st 312
broader: SWMCM

Two-Feet-Nine Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2F9RC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2F9RC COAL
broader: SWMCM

Two Foot Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FCC
has current status: CURRENT
has theme: BEDRCK
notation: TF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 2FCC COAL
broader: PLCM

Two Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2FCO COAL
broader: SWMCM

Two Foot Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: 2FSL COAL
broader: PMCM

Two Foot Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FT
has current status: CURRENT
has theme: BEDRCK
notation: 2ft
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2FT COAL
broader: PMCM

Two Foot Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 2FTC COAL
broader: PLCM

Two-Foot Vein Coal (Pembrokeshire)
type: Concept
in scheme: NamedRockUnit
alternative label: 2FTV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: 2FTV COAL
broader: NE

Two-Foot Ironstone Seam
type: Concept
in scheme: NamedRockUnit
alternative label: 2IRS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has lithology component: 2IRS FEST
broader: Cleveland Ironstone Formation

Second St John's Coal (South Yorkshire And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: 2SJC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2SJC COAL
broader: PMCM

Second Waterloo Sill
type: Concept
in scheme: NamedRockUnit
alternative label: 2WS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
broader: NE

Two Yard Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: 2YD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 2YD COAL
broader: PMCM

Three Coals (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 3C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 3C COAL
broader: SWMCM

Three Quarter Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: 3QCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 3QCC COAL
has lateral equivalent: 3QCC st 826
has obsolete equivalent: 3QCC mn 4192
broader: PMCM

Threequarters Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: 3QCO
has current status: CURRENT
has theme: BEDRCK
notation: 3Q
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 3QCO COAL
broader: PLCM

Three Quarters Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: 3QCW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 3QCW COAL
broader: PMCM

Three Quarters Mine Coal (South Lancashire) [Duplicate Code: Use 3qco]
type: Concept
in scheme: NamedRockUnit
alternative label: 3QRS
has current status: CURRENT
has theme: BEDRCK
notation: 3QRS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 3QRS COAL
broader: PLCM

Three Quarter Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: 3QTRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: 3QTRC COAL
broader: NE

Three Quarters Coals (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 3QUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 3QUC COAL
has lateral equivalent: 3QUC st 824
has obsolete equivalent: 3QUC st 824
broader: NE

Taw River Terrace Deposits, 3 Member And Taw River Terrace Deposits, 4 Member, Undifferentiated
type: Concept
in scheme: NamedRockUnit
alternative label: 3TAW4
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: 3TAW4 GRAV
has lithology component: 3TAW4 SANDU
has obsolete equivalent: 3TAW4 mn 3593
broader: TAW

River Terrace Deposits, 3 To 4 (Tamar)
type: Concept
in scheme: NamedRockUnit
alternative label: 3TMR4
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: 3TMR4 GRAV
has lithology component: 3TMR4 SANDU
broader: NE

Third Waterloo Sill
type: Concept
in scheme: NamedRockUnit
alternative label: 3WS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
broader: NE

Four-Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 4FCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 4FCO COAL
has lateral equivalent: 4FCO st 264
has lateral equivalent: 4FCO st 331
broader: SWMCM

Four Foot Coal (Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: 4FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 4FT COAL
broader: PMCM

Four Foot Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: 4FTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 4FTC COAL
broader: PMCM

Gala Unit 4 And Gala Unit 5 (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: 4GAL5
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Gala Group

Fourth Waterloo And First Ell Coal (Vale Of Belvoir)
type: Concept
in scheme: NamedRockUnit
alternative label: 4W1E
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 4W1E COAL
broader: PMCM

Fourth Waterloo Sill
type: Concept
in scheme: NamedRockUnit
alternative label: 4WS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
broader: NE

Five Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 5FC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 5FC COAL
broader: SWLCM

Five Foot Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 5FTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 5FTC COAL
has lateral equivalent: 5FTC st 10
has obsolete equivalent: 5FTC st 10
broader: SWMCM

Five-Feet-Gellideg Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 5FTG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 5FTG COAL
broader: SWLCM

Taw River Terrace Deposits, 5 Member And Taw River Terrace Deposits, 6 Member, Undifferentiated
type: Concept
in scheme: NamedRockUnit
alternative label: 5TAW6
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: 5TAW6 GRAV
has lithology component: 5TAW6 SANDU
has obsolete equivalent: 5TAW6 mn 3607
broader: TAW

Six-Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 6FCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 6FCO COAL
has lateral equivalent: 6FCO st 105
broader: SWMCM

Seven-Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 7FCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 7FCO COAL
broader: SWLCM

Seven-Feet-Yard Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 7FYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: 7FYC COAL
broader: SWLCM

Nine-Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: 9FCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 9FCO COAL
has lateral equivalent: 9FCO st 779
broader: SWMCM

Nine Feet Coal (Ingleton)
type: Concept
in scheme: NamedRockUnit
alternative label: 9FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: 9FT COAL
broader: PMCM

Ardmillan Group, Albany Group And Barr Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AAB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
broader: NA

Altnacealgach Alkali Feldspar-Syenite
type: Concept
in scheme: NamedRockUnit
alternative label: AAFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Achnaha Quartz-Monzonite Facies
type: Concept
in scheme: NamedRockUnit
alternative label: AAQM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: AAQM QMZ
broader: Achnaha Tonalite - Quartz-Monzonite Intrusion

Ardnamona Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AASA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: AASA SDST
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Achnaha Tonalite Facies
type: Concept
in scheme: NamedRockUnit
alternative label: AATO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: AATO TO
broader: Achnaha Tonalite - Quartz-Monzonite Intrusion

Achnaha Tonalite - Quartz-Monzonite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: AATQM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: AATQM QMZ
has lithology component: AATQM TO
broader: Ardnamurchan Centre 3
narrower: Achnaha Quartz-Monzonite Facies
narrower: Achnaha Tonalite Facies

Abbrook Clay And Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: AB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: AB CLAY
has lithology component: AB SANDU
has lithology component: AB SILT
has obsolete equivalent: AB mn 30
broader: Bovey Formation

Airdrie Blackband Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ABBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ABBC COAL
broader: MCMS

Airdrie Blackband Ironstone (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ABBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ABBI FEST
broader: MCMS

Alberbury Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: ABBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has obsolete equivalent: ABBR mn 63
broader: NE

Ardwell Bridge Basic Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: ABBV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38141
has lithology component: ABBV LAVA
has lithology component: ABBV PEL
has lithology component: ABBV VLSS
has lithology component: ABBV WACKE
has source info: ABBV_49232
has source info: ABBV_49798
has lateral equivalent: ABBV st 636
has obsolete equivalent: ABBV mn 3215
broader: Blackwater Formation
has lower boundary definition: Top of highest persistent sheet of fine-grained ultramafic rock in the Blackwater Formation.
has geographical distribution: 500 to 750 m-wide outcrop extending from Dead Wife's Hillock [NJ 340 267] to Ardwell Bridge and along valley of River Deveron to Gaul Burn, Succoth [NJ 430 357], Cabrach area, Moray District. 1:50 000 sheets 75E and 85E.
has lithology description: Amphibolite/metabasalt, mostly aphyric, locally with pillow structures. Interbanded with greywacke grits and slaty to phyllitic pelites.
has thickness description: c. 550-650 m (based on outcrop width with no allowance for probable folding).
has upper boundary definition: Top of highest persistent metabasalt sheet. Background lithology changes from greywacke grits with pelites to persistent pelites of the Corinacy Pelite Member.

Ayrshire Bauxitic Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: ABC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ABC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38142
has lithology component: ABC BUXCLY
has lithology component: ABC COAL
has lithology component: ABC MDST
has lithology component: ABC SEATM
has source info: ABC_49255
has source info: ABC_49986
has source info: ABC_52578
has source info: ABC_52764
has obsolete equivalent: ABC mn 191
has obsolete equivalent: ABC mn 192
broader: PGP
has lower boundary definition: Taken at lithological change from olivine basalt of the underlying Troon Volcanic Formation. The base is gradational from basalt through clayrock rich in sphaerosiderite to bauxitic clay. The base is considered to be stratiform, although it might be obscured by later lateritic weathering or diagenesis and some in situ alteration of basalt to bauxitic clay might have occurred.
has geographical distribution: Limited to north Ayrshire and parts of central Ayrshire
has lithology description: A pale grey to buff clayrock, of massive habit with conchoidal fracture, hard and compact. Texture ranges from fine-grained to ooidal, pisolitic and coarsely clastic. Mineralogically, "bauxitic in the chemical sense of containing more Al2O3 than can be accommodated with SiO2 to give kaolinite". The bauxitic clay may be considered a flint clay. The member may also contain sphaerosiderite, plant fragments, tree trunks and include beds of seatrock, coal and mudstone.
has thickness description: To about 20m
has upper boundary definition: Taken at the base of the Lower Coal Measures; in Ayrshire this is marked by the Raise Coal seam that lies immediately above the Ayrshire Bauxitic Clay.

Aberchirder Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ABCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEGRA

Abergorki Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: ABCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: ABCO COAL
broader: SWMCM

Aberdeen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABDN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: litho
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38145
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38146
has lithology component: ABDN CALSIR
has lithology component: ABDN PEL
has lithology component: ABDN PSAMM
has lithology component: ABDN QZITE
has lithology component: ABDN SEMPEL
has source info: ABDN_49386
has source info: ABDN_49841
has lateral equivalent: ABDN st 19
broader: Argyll Group
has lower boundary definition: Not seen: there is probably a major antiform running through the centre of the area of outcrop.
has geographical distribution: Occupies most of Sheet 77 and much of the eastern part of sheet 76E, together with small parts of sheets 86E and 87W. Probable extension into Sheet 67.
has lithology description: Interlayered psammite and semipelite, with subsidiary pelite and sporadic minor calcareous horizons.
has thickness description: Several kilometres, but not measureable due to intense folding and migmatisation over most of the outcrop.
has upper boundary definition: Incoming of coarse, gritty psammite in area to north of Oldmeldrum. Elsewhere upper contact is obscured by lateral transition to Ellon Formation.

Aberedw Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABDW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NP

Abdy Coal (South Yorkshire And North Nottinghamshire)
type: Concept
in scheme: NamedRockUnit
alternative label: ABDY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ABDY COAL
has lateral equivalent: ABDY st 920
has lateral equivalent: ABDY st 510
broader: PMCM

A-Bed Evaporite
type: Concept
in scheme: NamedRockUnit
alternative label: ABE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: ABE GYPST
has obsolete equivalent: ABE mn 3291
broader: Eden Shales Formation

Abbotsford Flags
type: Concept
in scheme: NamedRockUnit
alternative label: ABF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Ayrshire Basanitic And Foiditic Plugs And Vents
type: Concept
in scheme: NamedRockUnit
alternative label: ABFPV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
broader: SCPPV

Abercwmeiddaw Group
type: Concept
in scheme: NamedRockUnit
alternative label: ABG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OW
has predominant age: OW
has youngest age: OW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38147
has lithology component: ABG MDST
has lithology component: ABG SLTE
has source info: ABG_48648
broader: NE
has lower boundary definition: Drawn at the base of the Abercwmeiddaw Group where pale greyish blue, thickly bedded mudstones conformably rest upon black shales of the Nod Glas Formation.
has geographical distribution: The district around Corris and Aberllefenni (Merionethshire).
has lithology description: Thickly-bedded, mottled, grey-blue mudstones, passing locally into well cleaved slates.
has thickness description: 450 metres approx.
has upper boundary definition: Drawn at the conformable upward passage of the Abercwmeiddaw Group where mottled mudstones pass into blue mudstones with orange weathering of the Red Vein Formation.

Abergeldie Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ABGD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: ABGD DI
has lithology component: ABGD DIR
has lithology component: ABGD GD
has lithology component: ABGD GN
has lithology component: ABGD GNR
has lithology component: ABGD QDI
has lithology component: ABGD TO
broader: SSCGR
narrower: Creag Nan Gall Granodiorite

Abbotsford Flags And Grieston Shales
type: Concept
in scheme: NamedRockUnit
alternative label: ABGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Abergwilli Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABGW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: OE
has youngest age: OE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38148
has lithology component: ABGW FTUFF
has lithology component: ABGW MDST
has lithology component: ABGW SDST
has source info: ABGW_51030
has obsolete equivalent: ABGW DBB
broader: NA
has lower boundary definition: Base not seen during the current phase of survey but was previously taken at the first occurrence of "tuning fork" graptolites. (Strahan et al. 1909).
has geographical distribution: The Abergwilli Formation is restricted in occurrence to an elogate belt along the southwestern margin of the Lower Palaeozoic Welsh Basin extending from aound Llandeilo in the east to Crosshands in the west. Possible correlatives, ascribed to the Didymograptus bifidus beds crop out farther south in the ground between St Clears and Whitland.
has lithology description: The Abergwilli Formation comprises interbedded, dark grey, micaceous burrow-mottled mudstone and laminated graptolitic mudstone with scattered thin sandstone beds and tuffs.
has thickness description: Approximately 680m
has upper boundary definition: Upper boundary not seen during the current phase of survey but was previously taken at the base of the Didymograptus murchisoni bearing mudstones (now Felin Wen Formation) observed in a road bank opposite the corn mill in the village of Felin Wen (Strahan et al. 1909).

Abbey Head Bed
type: Concept
in scheme: NamedRockUnit
alternative label: ABH
has current status: CURRENT
has theme: BEDRCK
notation: ABH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38149
has lithology component: ABH CAMDST
has lithology component: ABH CONG
has lithology component: ABH SDST
has source info: ABH_51934
has obsolete equivalent: ABH mn 24
has obsolete equivalent: ABH mn 23
broader: WLH
has lower boundary definition: Faulted.
has geographical distribution: Coastal section at Abbey Head.
has lithology description: Coarse conglomerates interbedded with conglomeratic sandstones and a few thin marls.
has thickness description: 40 metres minimum.
has upper boundary definition: Unknown: probably faulted.

Abbotsbury Ironstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
has lithology component: ABI FEST
has obsolete equivalent: ABI mn 26
broader: Corallian Group

Allt Nam Biorag Psammite Member
type: Concept
in scheme: NamedRockUnit
alternative label: ABIP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38150
has lithology component: ABIP CALSIR
has lithology component: ABIP PSAMI
has lithology component: ABIP PSAMM
has lithology component: ABIP SEMPEL
has source info: ABIP_51186
has obsolete equivalent: ABIP mn 3216
broader: TFPS
has lower boundary definition: Top of the Creag na Sanais Semipelite Formation, where the predominant semipelite is overlain by predominantly feldspathic and quartzose psammites of the Allt nam Biorag Member
has geographical distribution: South of Newtonmore, between the Ericht - Laidon and Creag Liath faults
has lithology description: Feldspathic and quartzose psammites with some interbanded calc-silicates and semipelite units up to 0.5m thick; some cross-bedding seen.
has thickness description: c.400m
has upper boundary definition: Incoming of the grey psammites of the typical Fara Psammite Formation, above the feldspathic and quartzose psammites, with or without calc-silicates, and semipelites of the Allt nam Biorag Member.

Aberkenfig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABKF
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38151
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38152
has lithology component: ABKF CHRT
has lithology component: ABKF MDST
has lithology component: ABKF SMDST
has source info: ABKF_48717
has source info: ABKF_49016
has source info: ABKF_49151
has source info: ABKF_49279
has obsolete equivalent: ABKF mn 3335
broader: MARR
has lower boundary definition: The base is a gradational boundary with white-weathering, black, fine-grained limestones and interbedded black mudstones of the underlying Oystermouth Formation passing upwards into the thin-bedded radiolarian cherts and mudstones of the Aberkenfig Formation. In the type section of the Kenfig Borehole, the base is at 48.46m depth.
has geographical distribution: Parts of the northern and southern peripheries of the South Wales Coldfield:- on the north crop in the Ammanford district, from Gam [c.SN 540 139] east, to east of Llandybie [c.SN 645 173]; on the south crop, from west Gower [c.SS 430 945] (not exposed) east to Swansea Bay, and east of Swansea Bay to the Sarn Park area [c.SS 920 830].
has lithology description: Dark grey fissile mudstones with thin bedded radiolarian cherts and siliceous mudstones.
has thickness description: To c.35m
has upper boundary definition: The top is taken at the top of highest chert or siliceous mudstone of the Formation, where it is overlain by the lowest quartzite of the Twrch Sandstone Formation. In the partial type section of the Kenfig Borehole, the top is not seen, the Formation being unconformably overlain by marl and red clay of the Mercia Mudstone Group at 12.8m depth.

Aber Mawr Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AbM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O2
has lithology component: ABM FTUFF
has lithology component: ABM MDST
has lithology component: ABM TUF
has source info: ABM_51028
has source info: ABM_52423
has obsolete equivalent: ABM mn 421
broader: NP
has lower boundary definition: Not defined.
has geographical distribution: 1:50,000 Sheet 209 (St. Davids) and adjacent Sheet 210.
has lithology description: Dark grey mudstones locally with interbedded tuffs.
has thickness description: c.400M
has upper boundary definition: Not defined.

Aber Mawr Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABMR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38153
has lithology component: ABMR MDST
has lithology component: ABMR RYTUF
has source info: ABMR_51856
has source info: ABMR_52105
has obsolete equivalent: ABMR mn 31
broader: NA
has lower boundary definition: Not seen.
has geographical distribution: Ramsey Island, Pembrokeshire.
has lithology description: Dark, laminated graptolitic mudstones, with interbedded rhyolitic turbiditic tuffs and debrites.
has thickness description: More than 215m
has upper boundary definition: Conformably overlain by the Porth Lauog Formation, the boundary being taken at the first debrite incutsion into the black mudstones.

Am Binnein Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABN
has current status: CURRENT
has theme: BEDRCK
notation: ABN
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38154
has lithology component: ABN CONG
has lithology component: ABN SDST
has lithology component: ABN SLST
has source info: ABN_48813
has source info: ABN_51673
has obsolete equivalent: ABN mn 82
broader: Arbuthnott-Garvock Group
narrower: Druid Conglomerate Member
has lower boundary definition: The top of the Auchencar Sandstone Formation.
has geographical distribution: Isle of Arran.
has lithology description: Purplish grey sandstones with subordinate beds of red-brown siltstone.
has thickness description: About 950 m to 670 m in the west of Arran.
has upper boundary definition: The base of the Sannox Siltstone Formation in the Sannox area, and the unconformity with overlying Upper Devonian strata elsewhere on Arran.

Abercriban Oolite Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: ABO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38156
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38157
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38158
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38155
has lithology component: ABO DOLO
has lithology component: ABO LMMC
has lithology component: ABO LMOOL
has source info: ABO_48805
has source info: ABO_50474
has source info: ABO_51672
has obsolete equivalent: ABO mn 33
has obsolete equivalent: ABO mn 34
has obsolete equivalent: ABO mn 3147
has lateral equivalent: ABO CLD
has obsolete equivalent: ABO mn 35
broader: PEMB
narrower: PDC
has lower boundary definition: The base is placed at the sharp junction between a thin dolostone underlying the lowermost ooidal grainstone of the Abercriban Oolite Subgroup and the top of the grey mudstones forming the uppermost part of the Cwmynyscoy Mudstone Formation.
has geographical distribution: Northeast crop of the South Wales Coalfield, from Carn-yr-onen [SN 887 166] to Mynnyd Llangattock [SO 200 157].
has lithology description: Massive, pale grey, ooidal grainstone with some fine-grained micritic and dolomitic interbeds.
has thickness description: Up to 30m in the Chwar Pant-y-rhiw area [c.SO 200 157].
has upper boundary definition: The top is placed at a palaeokarstic surface, below which the ooidal grainstone at the top of the Abercriban Oolite Subgroup becomes increasingly disordered upwards and irregular ooidal limestone masses become separated by grey-green mudstone films. The palaeokarstic surface marks a regionally developed unconformity, overlain by micritic to grainstone limestones of the Llanelly Formation.

Abdy Rock
type: Concept
in scheme: NamedRockUnit
alternative label: ABR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AbR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38159
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38160
has lithology component: ABR SDST
has source info: ABR_51160
broader: PMCM
has lower boundary definition: Sharp upward change in a conformable succession from predominantly grey mudstone to sandstone - base of first sandstone above the Abdy or Winter Coal.
has geographical distribution: From southwest of Wath upon Dearne around the hamlet of Abdy [SK4430 9880], South Yorkshire, to Staincross Common, [SE3300 1100] Barnsley, South Yorkshire.
has lithology description: A thinly bedded, fine-grained, ripple cross-laminated, yellowish brown sandstone.
has thickness description: 0 to 53m
has upper boundary definition: Sharp upward change in a conformable succession from sandstone to predominantly mudstone - top of last sandstone bed below the Two-Foot Coal and overlying Maltby (Two-Foot) Marine Band.

Auchencar Burn Sandstones Member
type: Concept
in scheme: NamedRockUnit
alternative label: ABS
has current status: CURRENT
has theme: BEDRCK
notation: ABS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38161
has lithology component: ABS CONG
has lithology component: ABS SDST
has lithology component: ABS SLST
has source info: ABS_48813
has source info: ABS_51673
has lateral equivalent: ABS st 13
has obsolete equivalent: ABS mn 167
broader: Auchencar Sandstone Formation
has lower boundary definition: The top of the basal Quartz Sandstone Formation.
has geographical distribution: Isle of Arran.
has lithology description: Red-brown and purple grey cross-bedded sandstones, with beds of quartzite conglomerate and red-brown siltstone.
has thickness description: About 120 m thick.
has upper boundary definition: The base of the Creag Mhor Conglomerate Member, or locally, the Auchencar Lava Member.

Abbey Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: ABSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38163
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38162
has lithology component: ABSG GRAV
has lithology component: ABSG SANDU
has source info: ABSG_48952
has source info: ABSG_51301
has source info: ABSG_51899
has source info: ABSG_52912
has lateral equivalent: ABSG st 15
has lateral equivalent: ABSG st 82
has lateral equivalent: ABSG st 81
has obsolete equivalent: ABSG FEG
broader: Fenland Formation
has lower boundary definition: Rests unconformably on bedrock or older Quaternary deposits. Passes laterally into First Terrace Deposits (eg. of Nene and Welland rivers).
has geographical distribution: Mapped near the western and southwestern margins of Fenland in Lincolnshire and Cambridgeshire. Probably extensive beneath younger deposits throughout Fenland except, perhaps, in the east. Passes laterally into alluvial deposits (First Terrace Deposits).
has lithology description: Sands and gravels, some with marine shells, including clayey, sandy gravels and pebbly sands.
has thickness description: 0 - c.5m
has upper boundary definition: Contact with pebbly, silty, sandy clays and clayey sands of the Crowland Bed (Booth, 1982). In the absence of the Crowland Bed, may not be separable from the lowest part of the Barroway Drove Beds.

Armboth Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: ABTH
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Aberlady Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ABY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ABY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38164
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38165
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38166
has lithology component: ABY COAL
has lithology component: ABY FEST
has lithology component: ABY MDST
has lithology component: ABY SDST
has lithology component: ABY SEATS
has lithology component: ABY SLST
has source info: ABY_51455
has lateral equivalent: ABY WLO
has obsolete equivalent: ABY mn 4413
broader: SYG
narrower: LCRL
narrower: LDLS
narrower: MLOL
narrower: WIM
narrower: LLOL
narrower: SSLS
has additional age information: ?Asbian to Brigantian.
has lower boundary definition: The base is drawn at the base of the lowest of the Macgregor Marine Bands (Wilson, 1974), which in the type section is the Saltoun Marine Band (McAdam and Tulloch, 1985, p22).
has geographical distribution: Midlothian (part); East Lothian; Berwickshire (part).
has lithology description: Mainly pale coloured sandstones interbedded with grey siltstones and grey to dark grey mudstones; subordinate coal, seatrock, carbonates and ironstone.
has thickness description: Spilmersford Borehole 134m. Skateraw Borehole 139m.
has upper boundary definition: The top is taken at the base of the Upper Longcraig Limestone, the local equivalent of the Hurlet Limestone (Wilson, 1989).

Atherfield Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38167
has lithology component: AC CLAY
has lithology component: AC FEST
has lithology component: AC LMST
has lithology component: AC MDST
has lithology component: AC SANDU
has lithology component: AC SILT
has source info: AC_51325
has source info: AC_51530
has source info: AC_52315
has obsolete equivalent: AC mn 162
has obsolete equivalent: AC mn 163
has obsolete equivalent: AC mn 164
broader: LGS
has lower boundary definition: Unconformable to disconformable contact on Weald Clay (orangish brown/yellow or steely grey mudstone).
has geographical distribution: Kent to Dorset, and Isle of Wight.
has lithology description: Clays, silty clays and clayey silts (especially in upper part); locally sandy in upper part; locally glauconitic. Unweathered: dark grey or black. Weathered: chocolate brown, bluish grey and brown, mottled pinkish brown to orange.
has thickness description: 5-18m in southwest Weald; c.55m in Isle of Wight.
has upper boundary definition: Incoming of fine- to medium-grained sand of the Hythe Formation with negligible clay above silty or sandy clays of Atherfield Clay Formation.

Brithidir Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: ACBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Brithidir Porphyry
type: Concept
in scheme: NamedRockUnit
alternative label: ACBP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Allt-Y-Clych Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ACC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AcC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: SR
has youngest age: SR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38168
has lithology component: ACC CONG
has lithology component: ACC MDST
has lithology component: ACC SDST
has source info: ACC_52493
has obsolete equivalent: ACC mn 74
broader: NA
has lower boundary definition: Sharp and erosional. Taken at base of first bed of pebbly mudstone or conglomerate above the Tycwtta Mudstones or Yr Allt Formation.
has geographical distribution: Central Wales, east of Tywi Anticline.
has lithology description: Conglomerates, pebbly mudstones and sandstones. A few thin mudstone beds.
has thickness description: 12 - 80 metres.
has upper boundary definition: Gradational but taken at base of first thick mudstone unit of overlying Pistyll Gwyn Mudstones.

Acutistriatum-Comptoni Bed
type: Concept
in scheme: NamedRockUnit
alternative label: ACCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ac
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38169
has lithology component: ACCO LMST
has lithology component: ACCO MDST
has source info: ACCO_49587
has source info: ACCO_50409
has source info: ACCO_50845
has source info: ACCO_52426
has source info: ACCO_52585
has obsolete equivalent: ACCO st 23
has obsolete equivalent: ACCO mn 1020
has lateral equivalent: ACCO st 23
has obsolete equivalent: ACCO mn 48
broader: PET
has lower boundary definition: Passage up from relatively unfossiliferous brownish grey mudstone of undifferentiated Peterborough Member into shelly mudstone with fauna of Comptoni Bed as described under Lithology; base of Bed 37 in type section (Hudson and Martill, 1984, p.118).
has geographical distribution: England; Dorset to Humberside.
has lithology description: Grey calcareous mudstone, becoming more shelly and shell-detrital upwards, grading into pyritic shell bed (Comptoni Bed), overlain by brownish grey shaly mudstone (at type section) or grey calcareous mudstone with pale grey ovoid argillaceous limestone nodules and burrowed top (from Bedfordshire south) ( Acutistriatum Bed). Comptoni Bed has rich fauna of oysters, nuculacean bivalves, belemnites, and ammonites (including Binatisphinctes comptoni). Acutistriatum Bed fauna is rich in forams, and includes ammonites, notably species of Kosmoceras, including K. acutistriatum
has thickness description: 0.3 to 0.6m; 0.45m at type section.
has upper boundary definition: Change up from brownish grey mudstone with fauna of Acutistriatum Bed, as described under Lithology, into greenish grey mudstone of undifferentiated Peterborough Member, top is burrowed; top of Bed 38 in type section (Hudson and Martill, 1994, p. 118).

Achscrabster Flagstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ACFM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has obsolete equivalent: ACFM mn 45
broader: SPI

Alum Crag Grit
type: Concept
in scheme: NamedRockUnit
alternative label: ACG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: ACG SDST
broader: MARSD

Ashcombe Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: ACGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Achneim Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ACHM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ACHM PSAMM
has lithology component: ACHM SPSCH
broader: Corrieyairack Subgroup

Achnaconeran Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ACHN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ACHN PEL
has lithology component: ACHN PSAMM
has lithology component: ACHN SEMPEL
has source info: ACHN_49439
has source info: ACHN_52438
broader: Glenfinnan Group

Accerhill Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ACHS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AchS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38170
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38171
has lithology component: ACHS COAL
has lithology component: ACHS SDST
has lithology component: ACHS SEATS
has source info: ACHS_48721
has source info: ACHS_50498
has lateral equivalent: ACHS CFG
has obsolete equivalent: ACHS mn 41
has obsolete equivalent: ACHS mn 4558
broader: SAML
has lower boundary definition: Underlain by grey mudstones of the Crossdale Mudstone, including the Isohomoceras sp. nov. Marine Band.
has geographical distribution: Lancaster Fells.
has lithology description: Fine- to coarse-grained sandstone, with sandstone seatearths and thin coals.
has thickness description: 10 to 28m; thickest in the type area.
has upper boundary definition: Overlain by marine siltstones and mudstones with the Homoceras undulatum Marine Band.

Hematitic Tuffs
type: Concept
in scheme: NamedRockUnit
alternative label: ACHT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ach'Uaine Cluster
type: Concept
in scheme: NamedRockUnit
alternative label: ACHU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: ACHU MLDIH
has lithology component: ACHU OLHBT
has lithology component: ACHU UMR
broader: Appinite Suite

Acklington Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: ACKN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ACKN BA
broader: MULD

Ackworth Member
type: Concept
in scheme: NamedRockUnit
alternative label: ACKW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38172
has lithology component: ACKW COAL
has lithology component: ACKW MDST
has lithology component: ACKW SDST
has lithology component: ACKW SEATS
has lithology component: ACKW SLST
has source info: ACKW_51376
has obsolete equivalent: ACKW mn 46
broader: PUCM
narrower: Ackworth Rock
has lower boundary definition: Top of Cambriense Marine Band (or where absent through washout: base of Ackworth Rock).
has geographical distribution: Yorkshire Coalfield.
has lithology description: Grey mudstones, siltstones and sandstones with thin coals.
has thickness description: c.100m
has upper boundary definition: Base of Brierley Coal.

Ashy Cleugh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: ACLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: ACLS LMST
broader: Bewcastle Member
has supplementary information: Note that this unit was formerly incorrectly described in the Lexicon as the Ashy Cleugh Sandstone.

Accrington Mudstone
type: Concept
in scheme: NamedRockUnit
alternative label: ACM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ACM MDST
broader: PLCM

Achnacarry Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ACNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ACNS PSAMM
has lithology component: ACNS SEMPEL
has source info: ACNS_48861
has source info: ACNS_49436
broader: Glenfinnan Group

Auchmithie Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: ACO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: ACO CONG
has lithology component: ACO SDST
has source info: ACO_49429
has source info: ACO_51673
has lateral equivalent: ACO FCO
has obsolete equivalent: ACO mn 174
broader: SCN
has lower boundary definition: The top of the Red Head Sandstone Member.
has geographical distribution: The south-east limb of the Sidlaw Anticline, on Sheets 49 and 57E,
has thickness description: Up to 245 m thick at Auchmithie.
has upper boundary definition: The base of the Arbroath Sandstone Member, where this overlies the highest conglomerate bed of the Auchmithie Conglomerate.

Ackton Rock
type: Concept
in scheme: NamedRockUnit
alternative label: ACR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ACR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: ACR SDST
has lithology component: ACR SLST
has lateral equivalent: ACR st 849
has lateral equivalent: ACR st 897
broader: PMCM
has geographical distribution: West and south Yorkshire [Ackton, near Wakefield].
has thickness description: To c.10m

Acre Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: ACRE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: ACRE COAL
has source info: ACRE_51867
broader: Alston Formation
has geographical distribution: Northern Northumberland.
has supplementary information: Formerly considered part of the (English) Middle Limestone Formation.
has thickness description: c.0.6m

Aughnacloy Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ACSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: ACSF COAL
has lithology component: ACSF MDST
has lithology component: ACSF SDST
has obsolete equivalent: ACSF mn 175
broader: TYRO
has lower boundary definition: Not seen, but it is assumed to be conformable with the calcareous mudstones and thin interbedded limestones of the underlying Benbulben Shale Formation.
has geographical distribution: Counties Armargh and Tyrone, Northern Ireland.
has lithology description: A pale grey, medium-grained, parallel laminated, calcareous sandstone, which is ooidal in parts, and locally fossiliferous silty mudstone containing brachiopods and corals.
has thickness description: From 160 m - 300 m thick.
has upper boundary definition: Not seen, but seems to be conformable with the overlying Maydown Limestone Formation.

Achateny Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: ACTN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: ACTN VCBR
broader: MULP

Acton Group
type: Concept
in scheme: NamedRockUnit
alternative label: ACTO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SR
broader: NE

Acuminata Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ACU
has current status: CURRENT
has theme: BEDRCK
notation: Bdn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38175
has lithology component: ACU SHMDST
has source info: ACU_48762
has source info: ACU_49897
has source info: ACU_49898
has source info: ACU_50401
has source info: ACU_50837
has source info: ACU_50915
has lateral equivalent: ACU st 626
broader: LFE
has lower boundary definition: Transition from calcareous mudstone of the Bowden Way Beds to shell-detrital mudstone.
has geographical distribution: Central Dorset to Gloucestershire.
has lithology description: Shell-detrital mudstones with abundant Pracexogyra acuminata. NOTE: Map code 'Bdn' combines Acuminata Beds with Bowden Way Beds.
has thickness description: 5.58 metres (Purse Caundle Borehole).
has upper boundary definition: Transition from shell-detrital mudstone to argillaceous limestone (Fullers' Earth Rock).

Clogwyn Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: ACV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38176
has lithology component: ACV AND
has lithology component: ACV RY
has lithology component: ACV TUF
has source info: ACV_49770
broader: NE
has lower boundary definition: Drawn at the base of the Clogwyn Group where the base of quartz-rhyolites possibly with tuffs and some hornblende-andesite; base not seen.
has geographical distribution: Clogwyn Melyn, near Nantlle, Caernarvonshire.
has lithology description: Mainly quartz-rhyolites, possibly with tuffs, and some hornblende-andesite.
has thickness description: 305 metres approx.
has upper boundary definition: Drawn at the conformable upward passage of the Clogwyn Group where rhyolites with some tuffs are conformably overlain by grits and feldspathic tuffs of the Tryfan Group.

Viriditic Tuffs
type: Concept
in scheme: NamedRockUnit
alternative label: ACVT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Atherfield Clay Formation And Weald Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ACWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KP
has lithology component: ACWC CLAY
has lithology component: ACWC FEST
has lithology component: ACWC LMST
has lithology component: ACWC MDST
has lithology component: ACWC SANDU
has lithology component: ACWC SDST
has lithology component: ACWC SILT
has lithology component: ACWC SLMDST
has lithology component: ACWC SLST
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Ampthill Clay Formation And West Walton Formation (Undifferentiated) [Obsolete Code: Use Wwac]
type: Concept
in scheme: NamedRockUnit
alternative label: ACWW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: NE

Addlethorpe Grit
type: Concept
in scheme: NamedRockUnit
alternative label: AD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38178
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38177
has lithology component: AD SDST
has source info: AD_52091
has source info: AD_52594
has lateral equivalent: AD st 164
broader: Hebden Formation
has lower boundary definition: A sharp upward change in a conformable succession from predominantly grey mudstone to sandstone. The base of the first sandstone above the Reticuloceras todmordense (R1a4) Marine Band (if recognised) or the Cayton Gill Shell Bed.
has geographical distribution: The Pennine foothills, between Leeds, Bradford and Harrogate.
has lithology description: A brown, medium-to-coarse-grained, thinly to thickly bedded, quartzo-feldspathic, flaggy, micaceous sandstone.
has thickness description: Up to 50 m thick.
has upper boundary definition: A sharp upward change in a conformable succession from sandstone to predominantly mudstone. The top of the last sandstone below the Reticulatum-Vallites striolatus (R1c) Marine Band (where identified) or below the coarse-grained and pebbly Addingham Edge Grit.

River Terrace Deposits, 1 (Adur)
type: Concept
in scheme: NamedRockUnit
alternative label: AD1
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NP

River Terrace Deposits, 1-2 (Adur)
type: Concept
in scheme: NamedRockUnit
alternative label: AD1T2
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NP

River Terrace Deposits, 2 (Adur)
type: Concept
in scheme: NamedRockUnit
alternative label: AD2
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AD2 GRAV
has lithology component: AD2 SANDU
broader: NE
has geographical distribution: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description: London ALGI].

River Terrace Deposits, 2 To 3 (Adur)
type: Concept
in scheme: NamedRockUnit
alternative label: AD2T3
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AD2T3 GRAV
has lithology component: AD2T3 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

River Terrace Deposits, 3 (Adur)
type: Concept
in scheme: NamedRockUnit
alternative label: AD3
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NP

Adamson Band
type: Concept
in scheme: NamedRockUnit
alternative label: ADB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Adwalton Black Bed Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: ADBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ADBB COAL
has lateral equivalent: ADBB st 321
broader: PLCM

Ashfield Coking Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ADC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ADC COAL
broader: LSC

Ardclach Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ADCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: ADCL GN
broader: NWGRA

Aid Crag Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ADCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: ADCS SDST
has source info: ADCS_51867
broader: TYLS
has geographical distribution: The area around Sweethope, Northumberland.
has lithology description: Highly variable lenticular cross-bedded garnet-rich sandstone.
has thickness description: 15m to c.40m

Aberdeen Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ADEEN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEGRA

Ayr Diamond Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ADI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ADI COAL
broader: MCMS

Arched Mine Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ADMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: ADMC COAL
broader: NE

Addlethorpe Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: ADMS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Adail Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ADMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has lithology component: ADMU MDST
broader: NA

Allt Darrarie Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: ADQD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: ADQD QDI
broader: SSCGR

Ashfield Rider Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ADRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38179
has lithology component: ADRC COAL
has source info: ADRC_49221
broader: LSC
has lower boundary definition: Thin coal "cyclothem" overlies Ashfield Coking Coal, within Limestone Coal Formation.
has geographical distribution: Glasgow area of the Midland Valley, Scotland.
has lithology description: Thin, impersistent coal in the Glasgow-Stirling region. Locally replaces Possil Fourteen Inch Coal or is replaced by sandstone.
has thickness description: 0.1m
has upper boundary definition: Overlain by fissile mudstone below the Possil Fourteen Inch Coal, Limestone Shale Formation.

Ardnish Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ADS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AdS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38180
has lithology component: ADS MDST
has lithology component: ADS SDST
has lithology component: ADS SLST
has source info: ADS_49488
has source info: ADS_49615
has source info: ADS_50652
has source info: ADS_50888
has lateral equivalent: ADS HLGS
has lateral equivalent: ADS PABS
has obsolete equivalent: ADS mn 1899
has obsolete equivalent: ADS mn 4337
broader: LI
narrower: HLGS
has lower boundary definition: Lithology change, grain size decreases. Sporadic ironstones define boundary.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Sandstone, siltstone, fissile micaceous mudstone, with thin ironstones in the lower section. Gryphaea common.
has thickness description: 55 to 78m
has upper boundary definition: Overlain by fissile mudstones of the Pabay Shale Formation.

Ardnish Formation And Breakish Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ADSB
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JL
has predominant age: JL
has youngest age: JL
has lithology component: ADSB MDST
has lithology component: ADSB SDST
has lithology component: ADSB SLST
broader: LI

Ashford Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: ADSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: ADSG GRAV
has lithology component: ADSG SANDU
has source info: ADSG_51340
broader: NE

Aldress Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ADSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has obsolete equivalent: ADSH mn 65
broader: NP

Addingham Edge Grit
type: Concept
in scheme: NamedRockUnit
alternative label: AE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: AE SDST
has obsolete equivalent: AE mn 49
has lateral equivalent: AE st 140
broader: Hebden Formation
has geographical distribution: West Yorkshire.
has lithology description: The Addingham Edge Grit is a fine- to very coarse-grained, sporadically pebbly, feldspathic, thickly cross-bedded sandstone.

Ayr Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AEC COAL
broader: LCMS

Aeolian Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: AEOLD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: SUPD
narrower: NAEOL
narrower: Cover Sand
narrower: LOES
narrower: Fluvio-Aeolian Deposits
narrower: Blown Sand

Ayr Extra Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AEX COAL
broader: LCMS

Altagoan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AF
has current status: CURRENT
has theme: BEDRCK
notation: AF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38181
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38182
has lithology component: AF LMST
has lithology component: AF MDST
has lithology component: AF SDST
has lithology component: AF SLST
has source info: AF_51327
has source info: AF_52859
has source info: AF_53010
has obsolete equivalent: AF mn 4345
broader: TYRO
has lower boundary definition: Unknown but probably conformable with Iniscarn Formation.
has geographical distribution: Desertmartin area, Co.Londonderry, Northern Ireland.
has lithology description: Variable thin-bedded sediments: pebbly sandstones, laminated micaceous sandstones, siltstones, shaly mudstones, shales, thin micritic algal stromatolites.
has thickness description: Unknown
has upper boundary definition: Unknown but probably conformable with Desertmartin Limestone Formation.

Achanarras Fish Bed Member
type: Concept
in scheme: NamedRockUnit
alternative label: AFB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: AFB AROC
has lithology component: AFB LMST
has obsolete equivalent: AFB mn 42
broader: LYBR

Ayr Forty Fathom Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AFF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AFF COAL
broader: LCMS

Auchingree Four Inch Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AFIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: AFIC COAL
broader: LSC

Ashfell Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has lithology component: AFL LMST
has lithology component: AFL MDST
has lithology component: AFL SDST
has lithology component: AFL SLST
broader: Great Scar Limestone Group
narrower: Bryozoa Band (Ravenstonedale)

Aran Fawddwy Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AFM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: Aran Volcanic Group
narrower: PYBT

Allt-Tair-Ffynnon Formation And Nod Glas Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AFNG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: AFNG MDST
has lithology component: AFNG SDST
broader: NE

Allt Fawr Rhyolitic Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AFR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ARF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38185
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38184
has lithology component: AFR RYTUF
has lithology component: AFR TATUF
has source info: AFR_50909
broader: ULV
has lower boundary definition: Lies unconformably on sandstones, tuffs and siltstones of Cwm Eigiau Formation and mudstones of the Nant Ffrancon Subgroup.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: Rhyolitic ash-flow tuff.
has thickness description: 150m
has upper boundary definition: Underlies siltstones, sandstones and calcareous mudstones of the Dwyfach Formation.

Ashfell Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AfS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: AFS LMST
has lithology component: AFS MDST
has lithology component: AFS SDST
has lithology component: AFS SLST
has source info: AFS_48663
has source info: AFS_48664
has source info: AFS_51807
has obsolete equivalent: AFS mn 144
broader: Great Scar Limestone Group
has additional age information: Late Arundian

Alston Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38187
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38188
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38189
has lithology component: AG COAL
has lithology component: AG LMST
has lithology component: AG MDST
has lithology component: AG SDST
has lithology component: AG SEATS
has lithology component: AG SISTCC
has lithology component: AG SLST
has source info: AG_52813
has obsolete equivalent: AG mn 905
has obsolete equivalent: AG mn 1748
has obsolete equivalent: AG mn 2508
has obsolete equivalent: AG st 878
broader: YORE
narrower: Acre Coal (Northumberland)
narrower: ACRL
narrower: SBKL
narrower: SCL
narrower: SDG
narrower: Eelwell Limestone Member
narrower: Callant Limestone
narrower: LBWL
narrower: LDL
narrower: Cawledge Bend Limestone
narrower: MZBL
narrower: NGS
narrower: Five Yard Limestone Member
narrower: ML
narrower: HSCL
narrower: HTONL
narrower: HWL
narrower: HWLL
narrower: IPL
narrower: SML
narrower: SWOL
narrower: Cockleshell Limestone
narrower: OXL
narrower: Gayle Limestone
narrower: WDEL
narrower: WTL
narrower: WTLL
narrower: WTRL
narrower: WTRS
narrower: UBWL
narrower: LLLM
narrower: PGL
narrower: PNLS
narrower: Colwell Limestone
narrower: JWL
narrower: QHS
narrower: Barrasford Limestone
narrower: Hargate End Limestone
narrower: HLLS
narrower: SHIC
narrower: SIL
narrower: UNC
narrower: UNL
narrower: LTL
narrower: MDL
narrower: LSRL

Allt Goibhre Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AGBSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: AGBSP CALSIR
has lithology component: AGBSP SEMPEL
broader: Corrieyairack Subgroup

Ashgate Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: AGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AGC COAL
has lateral equivalent: AGC st 54
has lateral equivalent: AGC st 507
broader: PLCM

Ashgate Lower Leaf Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: AGCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AGCL COAL
broader: PLCM

Ashton Great Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: AGCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AGCO COAL
has lateral equivalent: AGCO st 55
has obsolete equivalent: AGCO mn 151
broader: PMCM

Ashgate Upper Leaf Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: AGCU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AGCU COAL
has lateral equivalent: AGCU st 53
broader: PLCM

Aberystwyth Grits Group
type: Concept
in scheme: NamedRockUnit
alternative label: AGF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: AGF AROC
has lithology component: AGF SDST
has obsolete equivalent: AGF mn 39
broader: NP
narrower: MYBA
narrower: TREF

Auglish Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AGH
has current status: CURRENT
has theme: BEDRCK
notation: AGH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38190
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38191
has lithology component: AGH SDST
has source info: AGH_52363
has obsolete equivalent: AGH mn 4464
broader: Derryloran Formation
has lower boundary definition: Apparently conformable on un-named red mudstone and sandstone in Derryloran Formation (boundary not seen).
has geographical distribution: Aughlish and Lower Kildress Townlands, south east Tyrone, Northern Ireland.
has lithology description: Silica rich sandstone
has thickness description: 7.5m
has upper boundary definition: Apparently conformably overlain by unnamed shale and "muddy" sandstone in Derryloran Formation (boundary not seen).

Alla Glen Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AGLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Claudy Formation

Aegiranum Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: AGMB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: AGMB LMST
has lithology component: AGMB MDST
has lithology component: AGMB SHMDST
has source info: AGMB_49180
has lateral equivalent: AGMB st 127
has lateral equivalent: AGMB st 178
has lateral equivalent: AGMB st 232
has lateral equivalent: AGMB st 353
has lateral equivalent: AGMB st 558
has lateral equivalent: AGMB st 627
has lateral equivalent: AGMB st 727
has lateral equivalent: AGMB st 765
has lateral equivalent: AGMB st 898
has obsolete equivalent: AGMB st 174
has obsolete equivalent: AGMB st 178
has obsolete equivalent: AGMB st 232
has obsolete equivalent: AGMB st 301
has obsolete equivalent: AGMB st 542
has obsolete equivalent: AGMB st 619
has obsolete equivalent: AGMB st 627
has obsolete equivalent: AGMB st 727
has obsolete equivalent: AGMB st 766
has lateral equivalent: AGMB st 174
has lateral equivalent: AGMB st 179
has lateral equivalent: AGMB st 271
has obsolete equivalent: AGMB st 179
has obsolete equivalent: AGMB st 271
has obsolete equivalent: AGMB st 353
has obsolete equivalent: AGMB st 558
has obsolete equivalent: AGMB st 651
has obsolete equivalent: AGMB st 765
has obsolete equivalent: AGMB st 898
has lateral equivalent: AGMB st 301
has lateral equivalent: AGMB st 542
has lateral equivalent: AGMB st 619
has lateral equivalent: AGMB st 651
has lateral equivalent: AGMB st 766
has obsolete equivalent: AGMB st 127
broader: PMCM
broader: SWMCM
broader: UCMS

Aymestry Group
type: Concept
in scheme: NamedRockUnit
alternative label: AGP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38192
has lithology component: AGP LMST
has lithology component: AGP SLST
has source info: AGP_49370
has source info: AGP_50751
has source info: AGP_50928
has source info: AGP_51009
broader: NE
has lower boundary definition: Drawn at the base of the Aymestry Group where nodular limestone conformably rests upon flaggy calcareous siltstones with fine-grained limestone nodules of the Lower Ludlow Shales.
has geographical distribution: The south Shropshire area including Aymestry, Herefordshire.
has lithology description: Grey nodular limestones with siltstone bands in the lower part passing upwards into massive blue hearted crystalline limestones passing into grey nodular limestones. The middle is very fossiliferous.
has thickness description: Max thickness 70 metres approx.
has upper boundary definition: Drawn at the conformable upward passage of the Aymestry Group where nodular limestones pass into olive green and buff flaggy siltstones of the Upper Ludlow Shales.

Aller Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38193
has lithology component: AGR CLAY
has lithology component: AGR GRAV
has lithology component: AGR SANDU
has source info: AGR_49276
has source info: AGR_49626
has source info: AGR_50211
has source info: AGR_50688
has source info: AGR_50692
has source info: AGR_50987
has source info: AGR_52239
has source info: AGR_52415
has source info: AGR_52476
has obsolete equivalent: AGR mn 67
has obsolete equivalent: AGR mn 543
has obsolete equivalent: AGR mn 4144
broader: NA
has lower boundary definition: Rests unconformably on Upper Greensand, where the contact is marked by an unconformable transition from pale green to pale brown sand with some glauconitic bands, iron staining with local chert from the Upper Greensand, to the overlying deposits of Aller Gravels. At Wolborough [SX 8535 7034], Aller Gravel has a faulted or unconformable contact with Upper Devonian Slates; here the contact is recognised by an abrupt change from the lithology of the Aller Gravel to coarse, locally dolomitised, limestones with red mudstone layers of the East Ogwell Limestone.
has geographical distribution: Sands Copse, Kingsteignton, Milber, Wolborough and Kingskerswell, south Devon.
has lithology description: Seen as 10-20cm-thick beds of lenticular-bedded abraded flint and chert gravels, with subordinate red-mottled silts and clays, coarse, angular, flinty gravelly clayey sand, with some cross-bedded coarse sand, lenticles of white clayey sand and reddish brown coarse sand. Locally finer-grained, more distinctly bedded flint gravels overlie the coarse gravels. The unit is interpreted to have been deposited by braided streams; the source is postulated to have been the Dartmoor highlands (Selwood and others, 1984; Cope et al., 1992), The constituents of the gravel vary locally, and may contain some or all of the following: flint, quartz and tourmaline rock, Greensand chert, Lower Carboniferous chert, Upper Carboniferous sandstone, white rounded clay clasts, vein quartz, dark grey hornfels and tuff.
has thickness description: To 25m
has upper boundary definition: The Aller Gravels are locally overlain by the Palaeogene clays and sands of the Bovey Formation, indeed the Sandygate Borehole [SX 8672 7507] passes through this contact. In this location, the overlying Lappathorn Member of the Bovey Formation is comprised of siliceous clays, sands and silts with pink, red and brown iron staining; these are all underlain by flint gravels that are thought to represent the Aller Gravel.

Agill Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: AGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: AGS SDST
broader: Hebden Formation

Agill Shale
type: Concept
in scheme: NamedRockUnit
alternative label: AGSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: Hebden Formation

Abbotsgrange Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: AGSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38194
has lithology component: AGSI C
has lithology component: AGSI S
has lithology component: AGSI V
has lithology component: AGSI Z
has source info: AGSI_50333
has obsolete equivalent: AGSI mn 27
broader: Forth Clay Formation
has additional age information: Windermere Interstadial.
has lower boundary definition: The relationship of the Abbotsgrange Silt Member (Forth Clay Formation) to the underlying Errol Clay Formation is probably unconformable. Never known to be in contact with the slightly older Kinneil Kerse Silt Member.
has geographical distribution: On the southern side of the Forth estuary, from east of Kincardine Bridge to Bo'ness.
has lithology description: Marine, well-bedded, very micaceous, black, grey and browish grey, loose silts, with many laminae and thin beds of fine-grained sand and dark grey silty clay. The unit has clasts up to 8cm of coal, basalt, mudstone and quartzite near its sandy base suggestive of local erosion of underlying strata. The deposit is considered to be prodeltaic in origin.
has thickness description: Veneer to 37m
has upper boundary definition: Overlain unconformably by younger deposits such as the Letham Silt or Claret Clay members (Carse Clay Formation) or by the Bothkennar Gravel Member (Forth Clay Formation).

Arngrove Spiculite Member
type: Concept
in scheme: NamedRockUnit
alternative label: AGSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AnS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38195
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38196
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38197
has lithology component: AGSP MDST
has lithology component: AGSP SDST
has lithology component: AGSP SLST
has source info: AGSP_50524
has source info: AGSP_50537
has source info: AGSP_52016
has source info: AGSP_52087
has source info: AGSP_52426
has obsolete equivalent: AGSP mn 137
has obsolete equivalent: AGSP mn 3541
broader: KTON
has lower boundary definition: An upward transition from the silty mudstones of the West Walton Formation or locally, fine-grained silty sands and clayey silts of the Temple Cowley Member of the Kingston Formation to coarser-grained, spiculitic sandstone.
has geographical distribution: The area between Beckley, Wheatley and Brill north-east of Oxford as seen on the 1:50 000 sheet 237 (inset map), and passes south-westwards into the Temple Cowley Member. Restricted to sheet 237, although similar spiculites are present in the Purton area (sheet 252).
has lithology description: Pale grey, siliceous or calcareous sandstone or siltstone with abundant siliceous spicules of Rhaxella perforata (tetractinellid sponge).
has thickness description: Up to 4.2 m thick.
has upper boundary definition: An upward transition from spiculitic sand or sandstone, to non-spiculitic sand and calcareous sandstone of the Beckley Sand Member of the Kingston Formation, or marls and limestones of the Oakley Member of the Stanford Formation.

Ayr Hard Coal (Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: AH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AH COAL
broader: MCMS

Assynt Hornblende Microdiorite Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: AHBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Ashgill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ahl
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38199
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38200
has lithology component: AHL MDST
has lithology component: AHL SDST
has lithology component: AHL SLMDST
has lithology component: AHL SLST
has lithology component: AHL TUF
has source info: AHL_48699
has source info: AHL_49785
has source info: AHL_49822
has source info: AHL_51929
has source info: AHL_52930
has obsolete equivalent: AHL mn 147
has obsolete equivalent: AHL mn 146
broader: Dent Group
narrower: Cystoid Limestone Member
narrower: REB
has lower boundary definition: Lower boundary taken at the junction of the shales with underlying calcareous mudstones with limestone nodules; the boundary is unconformable in places. Locally base taken at junction with rhyolitic tuff of the underlying High Haume Volcanic Formation.
has geographical distribution: Northern England throughout the outcrop of the Windermere Supergroup.
has lithology description: Dark blue-grey shales, distinguished from underlying formations of the Coniston Limestone Group by its lower calcareous content and the near absence of limestone nodules. Dark silty mudstones are commonly pervasively bioturbated.
has summary: Summary about the Ashgill Formation.
has thickness description: c.20m at type section, thins eastwards to less than 2m in Longsleddale. 125 to 215m in Ulverston District, generally <25m elsewhere.
has upper boundary definition: Base of overlying Skelgill Formation - black graptolitic mudstone.

Auchenhew Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AHM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38201
has lithology component: AHM MDST
has lithology component: AHM SDST
has lithology component: AHM SLST
has source info: AHM_49282
has source info: AHM_49621
has source info: AHM_49622
has source info: AHM_51743
has obsolete equivalent: AHM mn 170
broader: MMG
has lower boundary definition: Iron stained-sandstones at the top of the Lag a Bheith Formation, are overlain abruptly by the Auchenhew Mudstone Formation.
has geographical distribution: Arran.
has lithology description: Intertidal and tidal-flat facies with halite pseudomorphs within sandstones, siltstones and mudstones comprise the majority of the succession. Bimodal palaeocurrents, symmetrical ripples, flaser and wavy bedforms are common. Trace fossils are also commonly found.
has thickness description: 300m, although 45m is the maximum thickness recorded in a single exposure.
has upper boundary definition: Overlain by dark grey to black marine muds of the Levencorroch Mudstone Formation.

Arbroath Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AHS
has current status: CURRENT
has theme: BEDRCK
notation: AHS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38202
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38203
has lithology component: AHS CONG
has lithology component: AHS MDST
has lithology component: AHS SDST
has source info: AHS_49424
has source info: AHS_51208
has source info: AHS_51673
has lateral equivalent: AHS TEF
has obsolete equivalent: AHS mn 107
has obsolete equivalent: AHS mn 108
has obsolete equivalent: AHS st 817
has obsolete equivalent: AHS mn 109
broader: SCN
has lower boundary definition: The top of the Auchmithie Conglomerate Member
has geographical distribution: The south east limb of the Sidlaw Anticline, in the Dundee-Montrose area, on sheets 49 and 57.
has lithology description: Green or purplish grey to bright purple-red, cross-bedded fine- to medium-grained sandstones with local intraformational conglomerates containing concretionary limestone clasts and rare mudstone beds.
has thickness description: Up to 365m thick.
has upper boundary definition: Not seen, although unconformably overlain by the Stratheden Group (Upper Devonian).

Acer Hill Sandstone [Obsolete Entry: Incorrect Spelling: See Achs]
type: Concept
in scheme: NamedRockUnit
alternative label: AHSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CO
has lithology component: AHSA SDST
broader: NE

Armsheugh Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AHSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38204
has lithology component: AHSG S
has lithology component: AHSG V
has source info: AHSG_49726
has source info: AHSG_50565
has source info: AHSG_50918
has obsolete equivalent: AHSG mn 4313
has lateral equivalent: AHSG st 49
broader: MVG
has lower boundary definition: Sharp, irregular, erosional contact with underlying clay-rich gravel or clayey sand of the Lawthorn Diamicton Member, with relief amplitude of about 3.5m.
has geographical distribution: Probably local to west Ayrshire.
has lithology description: Sand and gravel, horizontal and cross stratified, interpreted to represent longtitudinal bars of proximal to medial reaches of a glaciofluvial outwash fan.
has thickness description: To 5.5m
has upper boundary definition: Sharp, conformable contact with laminated sand and organic-rich clay and silt of the Sourlie Organic Silt Formation.

Abbeyhill Shales
type: Concept
in scheme: NamedRockUnit
alternative label: AHSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: AHSH BATUF
has lithology component: AHSH MDST
has source info: AHSH_51867
broader: Gullane Formation
has lithology description: Dark blue shaly mudstones, locally crowded with ostracods.
has supplementary information: These beds form the lowest part of the Gullane Formation, overlying rocks of the Arthur's Seat Volcanic Formation.Though listed here as of "unclassified" rank, these beds might be considered an informal member of the Gullane Formation.

Ashness Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: AHT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AhT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38205
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38206
has lithology component: AHT LPTUF
has source info: AHT_49452
has source info: AHT_51104
broader: Birker Fell Andesite Formation
has lower boundary definition: Taken at base of lapilli-tuff resting on Grange Crags Andesite (lava); contact sharp but conformable or, at its eastern extent resting unconformably on Skiddaw Group rocks.
has geographical distribution: North Lake District near Borrowdale (Ashness Wood to Dale Head).
has lithology description: Lithic-rich lapilli-tuff, very poorly sorted and massive to weakly eutaxitic.
has thickness description: 10 - 15m
has upper boundary definition: Overlain by bedded to massive volcaniclastic sandstones contact is abruptly gradational, or by andesite of the undivided Birker Fell Andesite Formation.

Agnew's Hill Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: AHTM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Airy's Bridge Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AIB
has current status: CURRENT
has theme: BEDRCK
notation: AiB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38207
has lithology component: AIB PYRBRC
has lithology component: AIB RYLTUF
has lithology component: AIB RYTUF
has source info: AIB_49834
has source info: AIB_50725
has source info: AIB_51921
has obsolete equivalent: AIB mn 56
has obsolete equivalent: AIB mn 57
broader: Borrowdale Volcanic Group
narrower: Crinkle Tuff Member
narrower: LTT
has lower boundary definition: Base of rhyolitic pyroclastic rocks. Unconformable on slumped surface of Whorneyside Tuff Formation and locally conformable and interbedded with the Whorneyside Tuff Formation. In places directly on the Birker Fell Andesite Formation.
has geographical distribution: Scafell - Crinkel Crags area to Borrowdale and Thirlmere, Wasdale, Coniston Fells, Duddon Valley to Stainton Fell, Cumbria.
has lithology description: Massive, white to pink weathered eutaxitic and parataxitic rhyolitic tuffs and lapilli-tuffs, with some intercalated units of pyroclastic breccia and widespread beds of laminated tuff. Some component units are markedly garnetiferous.
has thickness description: 0 - 1010m.
has upper boundary definition: Defined by the base of the overlying formations that comprise a mixed succession of bedded pyroclastic rocks and volcaniclastic sandstones including: Lingmell Formation in the Central Fells, and the Duddon Hall Formation in the Coniston and Ulpha areas.

Aikbank Farm Glacigenic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AIK
has current status: CURRENT
has theme: SPRFCL
notation: AIK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38208
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38209
has lithology component: AIK CLAY
has lithology component: AIK DMTN
has lithology component: AIK GRAV
has lithology component: AIK SANDU
has lithology component: AIK SILT
has source info: AIK_48926
has source info: AIK_49633
has source info: AIK_50151
has source info: AIK_51310
has source info: AIK_51754
has lateral equivalent: AIK st 675
broader: ISCG
narrower: MGW
narrower: HSCLY
narrower: WCC
narrower: Green Croft Till Member
has lower boundary definition: Sharp, undulating, unconformable contact with pale red stony clay diamicton and cobble gravel of the HolmrookTill Member of the Blengdale Glacigenic Formation.
has geographical distribution: Lower Wasdale, West Cumbria, inland of the limit of ice of the Irish Sea Ice Stream during the "Gosforth Oscillation"
has lithology description: Rhythmically laminated silt and clay [Whinneyhill Coppice Clay Member], overlain by pebbly silty clay diamicton and sand [Green Croft Till Member], overlain by laminated clay and silt [Holmeside Clay Member], overlain by coarsening-upwards sequences of sand and gravel [Mainsgate Wood Sand and Gravel Member].
has thickness description: To 60m
has upper boundary definition: Either not overlain, or partially overlain by Flandrian peat or alluvial deposits.

Aisholt Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has lithology component: AIL LMST
broader: LESL

Ailsa Craig Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: AILC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: AIL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38210
has lithology component: AILC MCGN
has source info: AILC_50672
broader: Hebridean Province
has lower boundary definition: Intrusive contact.
has geographical distribution: Limited to the island of Ailsa Craig.
has lithology description: Circular microgranite intrusion also intruded by dolerite dykes.
has thickness description: c.1 square km in total area (circular).
has upper boundary definition: Intrusive contact.

Ailleag Diamicton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AILL
has current status: CURRENT
has theme: SPRFCL
notation: AIL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38211
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38212
has lithology component: AILL GRAV
has lithology component: AILL SANDU
has lithology component: AILL SILT
has obsolete equivalent: AILL mn 53
broader: Central Grampian (Albion) Glacigenic Subgroup
has additional age information: This unit was formerly considered Anglian to pre-Late Devensian.
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Central Grampian Mountains of Scotland.
has lithology description: Compact, very poorly sorted, clast-supported, matrix-rich diamicton formed of angular fragments of weathered psammite (locally granite or porphyry) to boulder size in a yellow-brown or orange, commonly ferruginous, matrix of silty sand.
has thickness description: 5m
has upper boundary definition: Sharp, unconformable, or gradational glacitectonic contact with Ardverikie Till Formation.

Ailstone Member (Warwickshire Avon)
type: Concept
in scheme: NamedRockUnit
alternative label: AILT
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: AILT GRAV
has lithology component: AILT SANDU
has obsolete equivalent: AILT mn 55
broader: Warwickshire Avon Valley Formation
has lithogenesis description: River Terrace Deposits.
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Avicula Ironstone Seam
type: Concept
in scheme: NamedRockUnit
alternative label: AIRS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has lithology component: AIRS FEST
broader: Cleveland Ironstone Formation

Ayr Jewel Coal (Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: AJ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AJ COAL
broader: MCMS

Archerbeck Beds
type: Concept
in scheme: NamedRockUnit
alternative label: AKB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38213
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38214
has lithology component: AKB CALSST
has lithology component: AKB CAMDST
has lithology component: AKB LMST
has lithology component: AKB MDST
has source info: AKB_49230
broader: TYLS
has lower boundary definition: Conformable contact with a thick seatearth lying c.90m above the Kinmont Limestone.
has geographical distribution: Confined to the Langholm district.
has lithology description: Alternating limestones, calcareous mudstones and mudstones with some calcareous sandstones. The strata contain a marine fauna of polyzoa, corals, brachiopods and bivalves.
has supplementary information: The proposed term Archerbeck Limestone Formation [ARLS] was abandoned, efectively unused, but the term Archerbeck Beds is retained as an informal, unclassified subdivision at the top of the Tyne Limestone Formation, below the Cornet Limestone. The Archerbeck Beds were orginally defined under his name (within the Lower Liddesdale Group) in the Langholm Memoir (Lumsden et al., 1967).
has thickness description: c.100m. Limestones form up to 33% of the thickness.
has upper boundary definition: Conformable contact with unfossiliferous sandstones and mudstones c.15m below the base of the Cornet Limestone.

Aymestry Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38215
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38216
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38217
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38218
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38219
has lithology component: AL ARLMST
has lithology component: AL CAMDST
has lithology component: AL LMST
has source info: AL_48655
has source info: AL_49310
has source info: AL_50364
has source info: AL_52005
has source info: AL_52348
has source info: AL_52581
has obsolete equivalent: AL mn 190
has obsolete equivalent: AL mn 3807
broader: NP
has lower boundary definition: Transitional with Lower Ludlow Shale.
has geographical distribution: Welsh Borderland, West Midlands, Coalbrookdale and Malverns.
has lithology description: Blue-grey, nodular argillaceous limestone with greenish shaly calcareous mudstone (at Ludlow).
has thickness description: 18 metres - 25 metres in Malvern area; up to 45 metres in type area.
has upper boundary definition: Transitional with Upper Ludlow Shale locally; local unconformity in type area; locally at base of yellow ochreous shale in type area (Alexander, 1936).

First Abden Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AL1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: AL1 LMST
broader: LLGS

Second Abden Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AL2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: AL2 LMST
broader: LLGS

Alpha Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: ALAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: ALAC COAL
broader: PMCM

Alluvium And Alluvial Fan Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ALAF
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: ALAF CLAY
has lithology component: ALAF GRAV
has lithology component: ALAF PEAT
has lithology component: ALAF SANDU
has lithology component: ALAF SILT
broader: NP

Alves Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ALB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has lithology component: ALB PESST
has lithology component: ALB SDST
broader: Forres Sandstone Group

Albion Glacigenic Group
type: Concept
in scheme: NamedRockUnit
alternative label: ALBI
has current status: CURRENT
has theme: SPRFCL
notation: ALB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38221
has lithology component: ALBI CLAY
has lithology component: ALBI DMTN
has lithology component: ALBI GRAV
has lithology component: ALBI SANDU
has lithology component: ALBI SILT
has source info: ALBI_49079
has source info: ALBI_49629
has source info: ALBI_49636
has source info: ALBI_50918
has source info: ALBI_52633
has obsolete equivalent: ALBI mn 3136
broader: Great Britain Superficial Deposits Supergroup
narrower: SDAG
narrower: East Grampian (Albion) Glacigenic Subgroup
narrower: LBAG
narrower: Central Grampian (Albion) Glacigenic Subgroup
narrower: MEAG
narrower: HPGL
narrower: IAG
narrower: ISCAG
narrower: SMCL
narrower: WIAG
narrower: WOLS
narrower: Banffshire Coast And Caithness (Albion) Glacigenic Subgroup
narrower: KNN
narrower: NSCA
narrower: NURS
narrower: NWHAG
narrower: LOFT
narrower: RIDG
narrower: Briton's Lane Formation
has lower boundary definition: Sharp, planar unconformable contact with units of the Dunwich and/or Crag groups, or bedrock.
has geographical distribution: The whole of Great Britain lying to the north of the Anglian glacial limit crossing southern England, but mainly occuring between the Anglian and Devension glacial limits.
has lithology description: A suite of glacial, glaciofluvial, glaciolacustrine and glaciomarine deposits that contain clasts derived from rocks cropping out throughout northern, central and eastern England, Scotland and Wales, and offshore, including diamictons [till], sand, gravel, silt and clay.
has thickness description: To 120m
has upper boundary definition: Ground surface or unconformable contact with units of the Caledonia Glacigenic Group, the Britannia Catchments Group or the British Coastal Deposits Group.

Albrighton Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: ALBN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ALBN COAL
has obsolete equivalent: ALBN mn 61
broader: PLCM

Alphington Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AlBr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38222
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38223
has lithology component: ALBR BREC
has source info: ALBR_49849
has source info: ALBR_49961
has source info: ALBR_51136
has source info: ALBR_52306
has source info: ALBR_52415
has lateral equivalent: ALBR TBR
has obsolete equivalent: ALBR mn 80
has obsolete equivalent: ALBR mn 81
has obsolete equivalent: ALBR HABR
broader: Exeter Group
has lower boundary definition: Rests on Whipton Formation or on basalt. Junction with the Whipton Formation is gradational over a vertical interval of about 10m, the boundary being drawn where breccia becomes the dominant lithology. Where the formation overlies basalt, a large hiatus is present between c.290 Ma basalts and c.260 Ma or younger Alphington Breccia.
has geographical distribution: Extends from Exeter City southwestwards through Alphington to Shillingford St George and Clapham (SX 895 870) areas.
has lithology description: Breccia, reddish brown, clayey, silty, fine-grained. Clasts predominantly culm shale and sandstone, together with hornfels, chert, quartz-porphyry, and lava. Most clasts less than 4cm; some range up to 0.1m and large boulders of porphyry are locally present.
has thickness description: 160-240m
has upper boundary definition: Overlain by Heavitree Breccia, which forms a scarp above the Alphington Breccia owing to the difference in cementation between the two formations.

Albert Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: ALBT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ALBT COAL
has lateral equivalent: ALBT st 671
has lateral equivalent: ALBT st 927
broader: PMCM

Albany Group
type: Concept
in scheme: NamedRockUnit
alternative label: ALBY
has current status: CURRENT
has theme: BEDRCK
notation: ALBY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38224
has lithology component: ALBY CONG
has lithology component: ALBY MDST
has lithology component: ALBY WACKE
has source info: ALBY_48694
has source info: ALBY_52655
has obsolete equivalent: ALBY mn 60
broader: NA
narrower: Doularg Formation
narrower: Craigmalloch Formation
has lower boundary definition: Faulted lower boundary.
has geographical distribution: Not defined.
has lithology description: Greywackes, mudstones, conglomerates.
has thickness description: At least approximately 1000m
has upper boundary definition: Faulted upper boundary.

Alluvial Cone
type: Concept
in scheme: NamedRockUnit
alternative label: ALC
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALC S
has lithology component: ALC V
has lithology component: ALC Z
broader: NE
has lithology description: Gravel-rich sand and silt, with a cone-like form. [Generic description].

Alloa Cherry Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ALCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ALCH COAL
broader: LCMS

Allt Crom Complex
type: Concept
in scheme: NamedRockUnit
alternative label: ALCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: AC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38225
has lithology component: ALCR GDBI
has lithology component: ALCR GNL
has source info: ALCR_48971
has source info: ALCR_51309
has obsolete equivalent: ALCR mn 70
broader: Argyll And Northern Highlands Granitic Suite
narrower: Allt Crom Granodiorite With Rafts Dominantly Of Appinitic Diorite
narrower: Allt Crom Granodiorite With Rafts Of The Coire Nan Laogh Semipelite Formation
narrower: Allt Crom Granodiorite With Rafts Of The Garva Bridge Psammite Formation
narrower: Allt Crom Granodiorite With Rafts Of The Loch Laggan Psammite Formation
narrower: Allt Crom Granodiorite With Rafts Of The Monadhliath Semipelite Formation
has geographical distribution: Southern Monadhliath Mountains in northern part of the Dalwhinnie district (Scotland sheet 63E) and southern part of the Foyers district (Scotland sheet 73E).
has lithology description: Composed of a grey, aphyric, biotite granodiorite, with a marginal zone of pink leucogranite up to 200m wide. The granodiorite is composed of oligoclase, quartz and microcline, partly chloritised biotite and minor hornblende. Abundant disorientated rafts of host rocks of psammite and semipelite up to 500m long occur in the southern part of the complex, preserving a disrupted ghost stratigraphy, mainly seen on Sheet 63E, Dalwhinnie. Elsewhere, the granodiorite includes an area where the rafts are predominantly composed of appinitic diorite. These rafts are penetrated by veins of granodiorite but otherwise generally intact, albeit thermally metamorphosed. Contact metamorphism is intense within the rafts, most noticeably affecting semipelites and any calc-silicate rocks, and recognised up to 1.4 km away from the external contacts of the intrusion. In the northern part of the complex, mainly Sheet 73E - Foyers, the metasedimentary rocks become progressively more coherent so that some areas may be regarded as intact metasedimentary formations permeated by granodiorite veins of a variety of scales and to varying degrees of intensity. Subdivisions of the complex are recognised on the basis of the character of the metasedimentary rocks enclosed.

Allt Crom Granodiorite With Rafts Dominantly Of Appinitic Diorite
type: Concept
in scheme: NamedRockUnit
alternative label: ALCRA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Allt Crom Complex

Allt Crom Granodiorite With Rafts Of The Coire Nan Laogh Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALCRC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Allt Crom Complex

Allt Crom Granodiorite With Rafts Of The Garva Bridge Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALCRG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Allt Crom Complex

Allt Crom Granodiorite With Rafts Of The Loch Laggan Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALCRL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Allt Crom Complex

Allt Crom Granodiorite With Rafts Of The Monadhliath Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALCRM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Allt Crom Complex

Allt Na Cuile Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALCU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AlCu
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
has lithology component: ALCU SDST
has source info: ALCU_51543
broader: Helmsdale Boulder Beds Formation

Alluvial Delta
type: Concept
in scheme: NamedRockUnit
alternative label: ALD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALD GRAV
has lithology component: ALD SANDU
has lithology component: ALD SILT
broader: NE
has lithology description: Gravel-rich sand and silt, developed at the mouths of tributary valleys. [Generic description].

Allt Dregnie Phyllite Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALDP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38226
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38227
has lithology component: ALDP CALSIR
has lithology component: ALDP LMST
has lithology component: ALDP PSAMM
has lithology component: ALDP SEMPEL
has source info: ALDP_49233
broader: Ailnack Phyllite And Limestone Formation
has lower boundary definition: At the top of flaggy psammites of the Corryhabbie Quartzite Formation.
has geographical distribution: Braes of Glenlivet, Glen Suie.
has lithology description: Micaceous psammites and semipelites with some pods and bands of calc-silicate rock. Contains a prominent white limestone in places. Phyllitic in places.
has thickness description: c. 140m in Glen Suie, including any thickening due to folding.
has upper boundary definition: At the incoming of prominent thin beds of limestone in strongly banded rocks of the Glen Suie Limestone Member.

Aldie Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALDTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38228
has lithology component: ALDTI DMTN
has lithology component: ALDTI S
has source info: ALDTI_50626
has source info: ALDTI_51669
broader: WHGL
has lower boundary definition: Sharp, interdigitating glacitectonic boundary with compressed peat and organic sand of the Berryley Peat Bed or with a local unit of Head named informally as the Hardslacks Gelifluctate Bed; or an apparently gradational contact with dark grey diamicton of the Camp Fauld Till Formation; or on bedrock.
has geographical distribution: Moss of Cruden, Buchan.
has lithology description: Gravelly clayey sand and diamicton (till), greenish grey (5GY 6/1), stiff, massive to crudely-horizontally bedded, with broken rounded pebbles and cobbles of flint and quartzite reworked from the Buchan Ridge Gravels Formation, together with sparse mica schist, granite, mafic igneous and red sandstone clasts. The matrix is kaolinitic quartz sand. The lithology of the till varies laterally with the underlying bedrock. It thickens to the south and east of the Moss of Cruden, where it includes red granite and has a weak NW-SE clast fabric. The till locally incorporates large masses of weathered brown sand with sparse quartzite clasts of unknown derivation and origin.
has thickness description: <10m
has upper boundary definition: Unconformable contact with red clayey diamicton of the Logie-Buchan Glacigenic Subgroup, or head deposits.

Alecks Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: ALEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ALEX COAL
broader: LSC

Alluvial Fan Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: ALF
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALF C
has lithology component: ALF CZ
has lithology component: ALF MDGV
has lithology component: ALF NATD
has lithology component: ALF P
has lithology component: ALF S
has lithology component: ALF SZCV
has lithology component: ALF V
has lithology component: ALF Z
has obsolete equivalent: ALF mn 77
is obsolete equivalent of: ALF FRHA
is obsolete equivalent of: ALF EHEN
is obsolete equivalent of: ALF CEVY
is obsolete equivalent of: ALF DOVEY
is obsolete equivalent of: ALF CWYDV
is obsolete equivalent of: ALF TEIFI
is obsolete equivalent of: ALF TYWI
is obsolete equivalent of: ALF NEATH
is obsolete equivalent of: ALF CONWY
broader: Fluvial Deposits
has lithology description: Alluvium (q.v.) with a low-angle cone form, developed at the mouths of tributary valleys [generic description: 'TMOS' procedures]; very localised source. [Description from East Anglian data].

Alluvial Fan Deposits 1
type: Concept
in scheme: NamedRockUnit
alternative label: ALF1
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALF1 GRAV
has lithology component: ALF1 PEAT
has lithology component: ALF1 SANDU
has lithology component: ALF1 SICL
broader: NP
has lithology description: Alluvium with a low-angle cone form developed at the mouths of tributary valleys [generic description: 'TMOS' procedures]; very localised source. [Descriptions from East Anglian data]. Older than 'Alluvial Fan Deposits'.

Alluvial And Glacial Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ALGD
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALGD NATD
has obsolete equivalent: ALGD mn 75
broader: NE
has lithology description: Gravel, sand, silt and clay, with rare peat; interbedded. [Generic description].

Allt Goch Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALGO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: ALGO MDST
has lithology component: ALGO SDST
broader: NA

Alturlie Gravels Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: SYMB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38230
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38231
has lithogenesis: GLACI
has lithology component: ALGR GRAV
has lithology component: ALGR SANDU
has source info: ALGR_48667
has source info: ALGR_48668
has source info: ALGR_51052
has obsolete equivalent: ALGR GSG
broader: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: Bothyhill Gravels Member
narrower: Braicklaich Sand Member
has lower boundary definition: Gradational, from the Ardersier Silts Formation below, or unconformable, with lodgement till or bedrock below.
has geographical distribution: The area surrounding the southern shore of the inner Moray Firth, between Inverness and Elgin.
has lithology description: Sand and gravel, typically a deltaic coarsening-upwards sequence. Origin thought to be glaciomarine.
has thickness description: At least 20m
has upper boundary definition: Unconformable with Late Devensian raised marine deposits above, or the present ground surface.

Allargue Graphitic Schist Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38232
has lithology component: ALGS PEL
has lithology component: ALGS SEMPEL
has source info: ALGS_49233
broader: TDSL
has lower boundary definition: At lower limit of graphitic pelite. Overlying calcareous semipelites and psammites of the Cock Burn Calcarous Schist Formation.
has geographical distribution: Poorly exposed on the valley sides in Upper Donside (around Corgarff and Allargue). Extends southeast approximately along A939 to Upper Fenzie.
has lithology description: Schistose graphitic pelite and subsidiary semipelite. Banded, slaty in parts.
has thickness description: 15 - 90m.
has upper boundary definition: At upper limit of graphitic pelite where it passes into semipelites of the Tornahaish Dark Schist and Limestone Formation.

Aller Halite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALHA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: ZG

Alkaid Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALK
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: YM

Allt Lwyd Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: All
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38233
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38234
has lithology component: ALL CONG
has lithology component: ALL MDST
has lithology component: ALL SDST
has lithology component: ALL SLST
has lithology component: ALL VCSST
has source info: ALL_50546
has source info: ALL_51180
has lateral equivalent: ALL st 371
has obsolete equivalent: ALL mn 1195
has obsolete equivalent: ALL mn 800
broader: OGW
narrower: Garth Grit Member
narrower: Aran Boulder Bed Member
has lower boundary definition: Unconformable on rocks of the Mawddach Group and the Rhobell Volcanic Group.
has geographical distribution: Northern, central and eastern Snowdonia.
has lithology description: Interbedded siltstone and coarse- to medium-grained, bioturbated and locally slumped sandstone, locally quartzose or volcaniclastic, subordinate conglomerate and rare mudstones; good sedimentary structures.
has supplementary information: Excluded from the Aran Volcanic Group by Rushton and Howells, 1998, because its identity with a particular formation remains unproved, and it is isolated from the constituent formations of that group by the ground between the Trawsfynnydd-Cwm Bowydd and Fynnon Eidda faults. Forms the base of the Ogwen Group in Snowdonia; lies between the Mawddach and Aran Volcanic groups to the east and south. Includes the Garth Grit Member at the base and, locally, the Aran Boulder Bed Member at the top.
has thickness description: 130 to 330m
has upper boundary definition: Succeeded chiefly by the Offrwm Volcanic Formation in southern Snowdonia and by mudstones of the Nant Ffrancon Subgroup in the north. Locally unconformable contact in the Snowdonia district.

Allens Coal (East Midlands)
type: Concept
in scheme: NamedRockUnit
alternative label: ALLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
has lithology component: ALLC COAL
broader: NE

Allt Breac Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ALLT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Ardvarney Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: ALM LMST
broader: Carraun Shale Formation

Allermuir Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ALMR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38236
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38237
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38235
has lithology component: ALMR AGG
has lithology component: ALMR AND
has lithology component: ALMR BA
has lithology component: ALMR BATUF
has lithology component: ALMR CONG
has lithology component: ALMR CSSST
has lithology component: ALMR OLBA
has lithology component: ALMR RY
has lithology component: ALMR TUF
has source info: ALMR_49223
has source info: ALMR_49427
has source info: ALMR_50454
has source info: ALMR_50730
has source info: ALMR_51146
has source info: ALMR_51173
has source info: ALMR_51673
has source info: ALMR_52828
has source info: ALMR_52986
has obsolete equivalent: ALMR mn 68
broader: PDH
has lower boundary definition: Conformable: in north east, where pyroxene andesites and olivine basalts overlie biotite rhyolite/dacite of Capelaw Volcanic Member. In south west where, olivine basalts and pyroxene andesites overlie rhyolites and thin lenses of conglomerate of the Bell's Hill Volcanic Member.
has geographical distribution: Pentland Hills.
has lithology description: Lowest flows are fine-grained microporphyritic pyroxene-andesites and olivine basalts, followed by feldspar phyric basalt and pyroxene andesites. Intercalations between flows include rhyolite and basic tuff, agglomerate and pebbly volcanic grit and tuff.
has thickness description: At least 366m on Allermuir Hill.
has upper boundary definition: Conformable: where pyroxene andesites, olivine basalts and locally basic tuff and breccia are overlain by rhyolitic tuff and flow-banded rhyolite of the Caerketton Volcanic Member.

Alne Glaciolacustrine Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALNE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38238
has lithology component: ALNE C
has lithology component: ALNE S
has lithology component: ALNE V
has lithology component: ALNE Z
has source info: ALNE_50714
has source info: ALNE_52594
has obsolete equivalent: ALNE mn 79
has obsolete equivalent: ALNE mn 1720
has obsolete equivalent: ALNE mn 1721
broader: NPEG
has lower boundary definition: Unconformable on the Vale of York Formation and locally on bedrock.
has geographical distribution: Vale of York north of York Moraine as far north as Thirsk, west to Littlethorpe and Hunsingore, east to Stockton on the Forest. Lake deposits generally below +30m AOD, down to +14m AOD in the lowest area near York.
has lithology description: Laminated clay with silt (varved) and subordinate fine-grained sand beds, plus a little marginal sand and gravel.
has thickness description: To 22m
has upper boundary definition: The present land surface or the base of the Sutton Sand Formation, or other "cover" sand deposits.

Alness Spiculite Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: HTHE

Altnaharra Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ALPS MIGM
has lithology component: ALPS PEL
has lithology component: ALPS PSAMI
has lithology component: ALPS PSAMM
has lithology component: ALPS PSH
has lithology component: ALPS PSMM
has lithology component: ALPS QZITE
has lithology component: ALPS SCH
has lithology component: ALPS SEMPEL
broader: MORR

Antrim Lava Group
type: Concept
in scheme: NamedRockUnit
alternative label: ALR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE
narrower: LBF
narrower: IB
narrower: UBF
narrower: Donald's Hill Ignimbrite Formation

Alpha Rider Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: ALRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: ALRC COAL
broader: PMCM

Alluvium And River Terrace Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ALRT
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALRT CLAY
has lithology component: ALRT GRAV
has lithology component: ALRT PEAT
has lithology component: ALRT SANDU
has lithology component: ALRT SICL
has lithology component: ALRT SILT
broader: NE

Palaeoproterozoic To Palaeozoic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ALRZ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: RZ
broader: NE

Alderney Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ALS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Alport Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ALSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CO
has predominant age: CO
has youngest age: CO
has lithology component: ALSA SDST
broader: NE

Allenton Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: ALSG
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: ALSG CLAY
has lithology component: ALSG GRAV
has lithology component: ALSG SANDU
has lithology component: ALSG SILT
has source info: ALSG_50017
has obsolete equivalent: ALSG mn 372
broader: NE
has lower boundary definition: The bedrock surface - commonly cryogenically involuted; other deposits may intervene.
has geographical distribution: Derwent Valley.
has lithogenesis description: River Terrace Deposits.
has lithology description: Sand and gravel with minor clay and silt lenses, commonly including deposits of head, both capping the terrace deposits and involuted with them.
has thickness description: Typically to 4m
has upper boundary definition: Top of sand and gravel, commonly corresponding to terrace surface; commonly overlain by head that is involuted with sand and gravel to varying degrees.

Alum Shale (Of The Glasgow Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ALSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has source info: ALSH_51867
broader: LWM
has supplementary information: These beds lie below the base of the Hurlet Limestone (also the base of the Lower Limestone Formation) and above the Hurlet Coal.
has thickness description: c.0.9m

Alloa Splint Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ALSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ALSP COAL
broader: LCMS

Auchleuchries Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALSSG
has current status: CURRENT
has theme: SPRFCL
notation: AU
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38239
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38240
has lithology component: ALSSG CLAY
has lithology component: ALSSG GRAV
has lithology component: ALSSG SANDU
has source info: ALSSG_49990
has source info: ALSSG_50499
has source info: ALSSG_50626
has obsolete equivalent: ALSSG GSG
broader: LBAG
has lower boundary definition: A sharp, undulating, erosional, unconformable contact with dark grey, pebbly clay diamicton of the Pitlurg Till Formation.
has geographical distribution: Eastern Aberdeenshire.
has lithology description: A mostly pale yellowish brown pebbly sand, containing a relatively large proportion of pink granite and seams of chocolate brown or dark grey clay, which is interpreted as having been derived from the underlying Pitlurg Till Formation.
has thickness description: To 12m
has upper boundary definition: Sharp, planar or gradational glacitectonic, unconformable contact with a reddish brown, gravelly sandy clay diamicton of the Hatton Till Formation, and elsewhere overlain by yellowish brown, gravelly clayey sand diamictons of the East Grampian Glacigenic Subgroup, which contain psammite, metagreywacke and granite clasts.

Alternata Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ALT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OS
has predominant age: OS
has youngest age: OS
has source info: ALT_50759
has obsolete equivalent: ALT st 30
broader: NP
has thickness description: C.30M IN THE NORTH Caradoc area increasing to c.120m southwards.

Allenton Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: ALTD
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: ALTD GRAV
has lithology component: ALTD SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Allt Dhub Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALTDU
has current status: CURRENT
has theme: BEDRCK
notation: Mods
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38241
has lithology component: ALTDU CALSST
has lithology component: ALTDU SDST
has lithology component: ALTDU SLST
has source info: ALTDU_49612
has source info: ALTDU_52601
broader: MODS
has lower boundary definition: Fossiliferous sandstones overlying conglomerates (usually red) of the Sgaorishal Member.
has geographical distribution: Isle of Rum/Sea of the Hebrides Basin.
has lithology description: Fossiliferous, grey, well-bedded sandstones. Fragments of plant, wood, fish, shells and ostracods are common. The lithology changes to siltstone and the fossils found signify an enviromnent change from alluvial to estaurine and shallow-marine conditions that prevailed at the Jurassic, but the unit cannot be accurately dated as such. Not shown on 50k maps.
has thickness description: 18m
has upper boundary definition: No overlying unit on Rum.

Alton Coal (Leicester, Nottingham, Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: ALTN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ALTN COAL
has lateral equivalent: ALTN st 316
broader: PLCM

Alluvium
type: Concept
in scheme: NamedRockUnit
alternative label: ALV
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: ALV C
has lithology component: ALV CZ
has lithology component: ALV CZS
has lithology component: ALV NATD
has lithology component: ALV P
has lithology component: ALV S
has lithology component: ALV V
has lithology component: ALV Z
is obsolete equivalent of: ALV DOVEY
is obsolete equivalent of: ALV CWYDV
is obsolete equivalent of: ALV NEATH
is obsolete equivalent of: ALV TEIFI
is obsolete equivalent of: ALV TYWI
is obsolete equivalent of: ALV CONWY
is obsolete equivalent of: ALV LGA
is obsolete equivalent of: ALV BRYD
is obsolete equivalent of: ALV CEAL
broader: Fluvial Deposits
narrower: WARP
narrower: Alluvial Deposits, Buried, Postglacial Estuarine-Marine [See Descriptions For Limitations Of Use]
narrower: Alluvial Deposits, Postglacial, Terrestrial [See Descriptions For Limitations Of Use]
has lithology description: Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and basal gravel. A stronger, desiccated surface zone may be present. [Generic description].

Alluvium 1
type: Concept
in scheme: NamedRockUnit
alternative label: ALV1
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ALV1 CLAY
has lithology component: ALV1 GRAV
has lithology component: ALV1 PEAT
has lithology component: ALV1 SANDU
has lithology component: ALV1 SICL
has lithology component: ALV1 SILT
broader: NP
has lithology description: Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and a basal gravel. A stronger, desiccated surface zone may be present. [Generic description]. Older than "Alluvium".

Alluvial Deposits, Buried, Postglacial Estuarine-Marine [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: ALVM
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
broader: Alluvium
has supplementary information: The code was originated for use in describing Quaternary Domains in the Sellafield (Cumbria) area, as a subset of "Alluvial deposits overlying possible postglacial sequence". To avoid potential confusion it should be used only for similar purposes in future. Note that on the related Quaternary Domains map, this category was described as: "Possible buried postglacial estuarine-marine sequence".

Alluvial Deposits, Postglacial, Terrestrial [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: ALVT
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
broader: Alluvium
has supplementary information: The code was originated for use in describing Quaternary Domains in the Sellafield (Cumbria) area, as a subset of "Alluvial deposits overlying possible postglacial sequence". To avoid potential confusion it should be used only for similar purposes in future. Note that on the related Quaternary Domains map, this category was described as: "Postglacial terrestrial sequence".

Alecs Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: ALXC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ALXC COAL
broader: PLCM

Alveley Member
type: Concept
in scheme: NamedRockUnit
alternative label: ALY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Aly
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38242
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38244
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38243
has lithology component: ALY COAL
has lithology component: ALY LMST
has lithology component: ALY MDST
has lithology component: ALY SDST
has source info: ALY_48659
has source info: ALY_48660
has source info: ALY_49786
has source info: ALY_49788
has source info: ALY_49789
has source info: ALY_49791
has source info: ALY_51197
has source info: ALY_52630
has obsolete equivalent: ALY mn 2145
has obsolete equivalent: ALY mn 1090
has obsolete equivalent: ALY mn 2146
broader: SAL
has lower boundary definition: Conformable, transitional-gradational boundary, arbitrarily taken at the base of the first major red-bed stratum, overlying the grey mudstone-dominated Dark Slade Member of the Halesowen Formation.
has geographical distribution: West Midlands and Salop.
has lithology description: Red mudstone and sandstone, fine- to medium-grained with thin 'Spirobis' limestone beds and pedogenic limestone (caliche). Sandstone mostly sublitharenite.
has thickness description: 152 to 274m in Alveley area; 50 to 140m in south Staffordshire.
has upper boundary definition: Poorly defined, but arbitrarily taken at the base of a sandstone-dominated succession (Enville Member), characterised by conglomerates and pebbly sandstones with extrabasinal clasts, commonly of Carboniferous limestone and chert.

Ayr Major Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: AMA COAL
broader: MCMS

Abercorn Main Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: AMAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: AMAC COAL
broader: LSC

Ampthill Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AMC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AmC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43442
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43443
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43444
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43445
has lithology component: AMC CAMDST
has lithology component: AMC LMST
has lithology component: AMC MDST
has source info: AMC_48944
has source info: AMC_48945
has source info: AMC_49500
has source info: AMC_50069
has source info: AMC_50070
has source info: AMC_50948
has source info: AMC_50969
has source info: AMC_50991
has source info: AMC_51172
has source info: AMC_51241
has source info: AMC_51346
has source info: AMC_51413
has source info: AMC_52561
has obsolete equivalent: AMC mn 86
has obsolete equivalent: AMC mn 508
has obsolete equivalent: AMC mn 1678
has obsolete equivalent: AMC mn 1044
has obsolete equivalent: AMC mn 4146
broader: Ancholme Group
narrower: RDDI
has additional age information: Late Jurassic, Late Oxfordian to (locally) earlt Kimmeridgian (Tenuiserratum to Baylei zones).
has lower boundary definition: Base of mudstones (as described under Lithology), resting on darker more silty mudstone of the West Walton Formation or on limestone/sandstone of that formation's members (Upware Limestone, Elsworth Rock) or of the Corallian Group; generally a marked colour change and break of slope at outcrop; change commonly well-marked on borehole geophysical (particularly gamma-ray) logs. Base of unit AmC1 in Fenland (Cox and Gallois, 1979).
has geographical distribution: Oxon/Wilts, where it passes progressively southwestwards into the Corallian Group (Horton et al., 1995; Gallois and Cox, 1994), to the Market Weighton area, where it is overstepped by Cretaceous rocks (Gaunt et al., 1980); also present in the Cleveland Basin (Powell et al., 1992).
has lithology description: Mudstone, mainly smooth or slightly silty, pale to medium grey with argillaceous limestone (cementstone) nodules; some rhythmic alternations of dark grey mudstone in the lower part; topmost beds are typically pale grey marls with cementstone.
has supplementary information: Powell, J H, Cooper, A H and Benfield, A C. 1992, give details of a typical onshore Yorkshire sequence in the Kirklington Borehole.
has thickness description: 0 to c.90m; typically c.25m in Oxon-Bucks., c.10m in the Bedfordshire type section; c.50m in Fenland, c.90m in north Lincolnshire.
has upper boundary definition: Upward change to darker mudstone of the Kimmeridge Clay Formation; commonly an erosive non-sequence marked by phosphatic pebbles; generally a marked colour change and break of slope at outcrop; change comonly well-marked on borehole geophysical (particularly gamma-ray) logs. Top of unit AmC42 in Fenland (Cox and Gallois, 1979), but incomplete and succeeded unconformably by Cretaceous rocks in the vicinity of the type section.

Ancholme Group
type: Concept
in scheme: NamedRockUnit
alternative label: AMG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AmG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43447
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43446
has lithology component: AMG ARLMST
has lithology component: AMG CAMDST
has lithology component: AMG MDST
has lithology component: AMG SALMST
has lithology component: AMG SDST
has lithology component: AMG SLMDST
has lithology component: AMG SLST
has source info: AMG_49892
has source info: AMG_50042
has source info: AMG_50043
has source info: AMG_51523
has source info: AMG_52090
has source info: AMG_52139
has source info: AMG_52426
has source info: AMG_52865
has source info: AMG_52941
has obsolete equivalent: AMG mn 87
broader: NP
narrower: OXC
narrower: OXWW
narrower: WWAC
narrower: WWAK
narrower: WWB
narrower: KC
narrower: KLB
narrower: KLBT
narrower: KLOX
narrower: Ampthill Clay Formation
narrower: Ampthill Clay Formation And Kimmeridge Clay Formation (Undifferentiated)
has lower boundary definition: Base of Kellaways Formation; commonly a shelly mudstone resting on limestone of the Cornbrash Formation.
has geographical distribution: Waddesdon, Buckinghamshire, between Oxford and Aylesbury (Thame district, Sheet 237), where Corallian Group wedges out (Horton, A, et al, 1995) to Market Weighton area, Yorkshire (Sheet 72). N.B. Mutually exclusive with the Corallian Formation/Group, thus not used south of Oxford, nor in the Cleveland Basin.
has lithology description: Predominantly grey, marine mudstone and silty mudstone; beds of argillaceous limestone nodules (or more or less persistent beds) at some levels; units of siltstone and sandstone at some levels, widespread near base (in Kellaways Formation), in middle part (West Walton Formation) and more locally at other levels (notably Kimmeridge Clay Formation of Oxon/Buckinghamshire); shelly marl, limestone and sandy limestone developed locally (notably in the West Walton Formation).
has thickness description: Probably zero (over Market Weighton High) to c.350m in central/eastern Lincolnshire (Louth district, Sheet 103), about 150-180m in Oxon/Buckinghamshire.
has upper boundary definition: Unconformable junction of mudstones with uppermost Jurassic/Lower Cretaceous limestones and sandstones; in the southwest (Oxon/Buckinghamshire) Kimmeridge Clay Formation overlain by Portland Formation; farther north, Ancholme Group progressively overstepped towards the Market Weighton High.

Abhainn Mhor Gabbro Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: AMGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: AMGB GB
broader: STKI

A'Mharagach Member
type: Concept
in scheme: NamedRockUnit
alternative label: AMHAR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43448
has lithology component: AMHAR BREC
has lithology component: AMHAR CONG
has lithology component: AMHAR LMSTN
has lithology component: AMHAR SDST
has source info: AMHAR_52430
has source info: AMHAR_52601
broader: MODS
has lower boundary definition: Abrupt transition to 'red beds' above the conglomerates of the Shellesder Member.
has geographical distribution: Sea of the Hebrides Basin/Isle of Rum.
has lithology description: Alluvial, pedogenesis and floodplain deposits (interpreted as cyclothems, Emeleus, 1997) are recorded in distinct red beds of fining upwards, arenaceous sediments, interbedded with cornstones. Not shown on 50K maps.
has thickness description: 40m
has upper boundary definition: Top underlies cross-stratified conglomerates of the Sgoarishal Member.

Ampthill Clay Formation And Kimmeridge Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AMKC
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JD
has lithology component: AMKC ARLMST
has lithology component: AMKC CAMDST
has lithology component: AMKC FEST
has lithology component: AMKC LMST
has lithology component: AMKC MDST
has lithology component: AMKC SANDU
has lithology component: AMKC SAPEL
has lithology component: AMKC SDST
has lithology component: AMKC SILT
has lithology component: AMKC SLST
broader: Ancholme Group

Alderwood Mudstone
type: Concept
in scheme: NamedRockUnit
alternative label: AMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has obsolete equivalent: AMM mn 64
broader: NE

Amaliae Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: AMMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AMMB MDST
has lithology component: AMMB SHMDST
has source info: AMMB_49180
has lateral equivalent: AMMB st 390
has lateral equivalent: AMMB st 547
has lateral equivalent: AMMB st 829
has obsolete equivalent: AMMB st 28
has obsolete equivalent: AMMB st 471
has obsolete equivalent: AMMB st 618
has obsolete equivalent: AMMB st 829
has lateral equivalent: AMMB st 28
has lateral equivalent: AMMB st 471
has lateral equivalent: AMMB st 618
has obsolete equivalent: AMMB st 390
has obsolete equivalent: AMMB mn 2707
broader: PLCM

Allt A' Mhuilinn Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AMMU
has current status: CURRENT
has theme: BEDRCK
notation: AMMU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43449
has lithology component: AMMU CONG
has lithology component: AMMU MDST
has lithology component: AMMU SLST
has source info: AMMU_51463
has source info: AMMU_51673
has source info: AMMU_52128
broader: NE
has lower boundary definition: An unconformity with the Dalradian Supergroup below.
has geographical distribution: The Ben Nevis area of Scotland.
has lithology description: Mainly mudstone and laminated siltstone, with quartzite-dominated conglomerate intercalations
has thickness description: About 15m thickness exposed.
has upper boundary definition: The base of the predominantly volcanic rocks belonging to the Ben Nevis Volcanic Formation.

Ardmillan Group
type: Concept
in scheme: NamedRockUnit
alternative label: AMN
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43450
has lithology component: AMN CONG
has lithology component: AMN MDST
has lithology component: AMN SDST
has lithology component: AMN SLST
has source info: AMN_48694
has source info: AMN_49784
has source info: AMN_50759
has source info: AMN_50824
has source info: AMN_52760
has obsolete equivalent: AMN mn 119
is obsolete equivalent of: AMN AWL
broader: NP
narrower: Drummuck Subgroup
narrower: WHE
narrower: Ardwell Subgroup
has lower boundary definition: Drawn at the base of the Ballatchie Formation where blue grey nodular mudstone,siltstone,fine-grained sandstone and conglomerate rest conformably upon boulder conglomerate with matrix supported clasts of basalt, dolerite and gabbro of the Benan Conglomerate Formation.
has geographical distribution: The Girvan area from Girvan south to Glen App.
has lithology description: Turbiditic sandstone, siltstone and mudstone with conglomerate at its base. Lateral impersistence and occurrence of similar lithologies at different horizons cause difficulties with stratigraphy.
has thickness description: c.2000m.
has upper boundary definition: Overlain unconformably by the Silurian Mulloch Hill Conglomerate Formation.

Amundsen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AMND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
broader: Dunlin Group

Auchmeddon Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: AMNGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43451
has lithology component: AMNGR S
has lithology component: AMNGR V
has source info: AMNGR_49172
has source info: AMNGR_50162
has source info: AMNGR_50290
has source info: AMNGR_50626
has source info: AMNGR_52460
has obsolete equivalent: AMNGR mn 171
has obsolete equivalent: AMNGR mn 172
has obsolete equivalent: AMNGR mn 1722
has obsolete equivalent: AMNGR mn 173
broader: Blackhills Sand And Gravel Formation
has additional age information: Devensian (?MIS 2).
has lower boundary definition: The lower boundary of the formation is a scoured, undulatory erosion surface (amplitude about 1.0m) on reddish brown diamicton of the Byth Till Formation.
has geographical distribution: Buchan, northeast Scotland. The member is only known from the vicinity of the Howe of Byth Quarry on Sheet 97 (Fraserburgh).
has lithology description: Gravel. Interpreted as glaciofluvial outwash. Grey, pebble to boulder grade. Clast-supported with a medium to coarse quartzose sand matrix. Clasts are subrounded to rounded and composed mainly of quartzite (probably reworked from underlying gravel deposits and Devonian conglomerates) - other lithologies are rare. The gravels are crudely horizontally bedded with local sand interbeds displaying horizontal stratification. Clast imbrication measurements indicates palaeocurrents flowing towards the south.
has thickness description: To 3m
has upper boundary definition: The formation either occurs at the present ground surface or is overlain by Holocene peat or alluvial sediments.

Amphibolite And Calcsilicate-Rock Of Uncertain Origin
type: Concept
in scheme: NamedRockUnit
alternative label: AMPCS
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Amphibolite Of Uncertain Origin
type: Concept
in scheme: NamedRockUnit
alternative label: AMPH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has lithology component: AMPH AMPHB
broader: NA

A'Mhoine Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AMPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: AMPS PAMPHB
has lithology component: AMPS PEL
has lithology component: AMPS PSAMM
has lithology component: AMPS PSAP
has lithology component: AMPS PSMGN
has lithology component: AMPS SEMPEL
broader: MORR
narrower: Glen Achall Psammite And Semipelite Member
narrower: STRC

Alum Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: AMSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
broader: WHM

Ambaston Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: AMTD
has current status: CURRENT
has theme: SPRFCL
notation: SYMB
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AMTD GRAV
has lithology component: AMTD SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Amethyst Member
type: Concept
in scheme: NamedRockUnit
alternative label: AMTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: Bunter Shale Formation

Ashdown Beds (A) [Obsolete Code: Use Asd]
type: Concept
in scheme: NamedRockUnit
alternative label: AN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KV
has predominant age: KV
has youngest age: KV
broader: NE
has supplementary information: The bracketed letter (A) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Annagher Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: ANC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ANC COAL
broader: NE

Ashton Mudstone Member And Crackington Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ANCK
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
broader: NE

Andrews Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: ANDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ANDC COAL
broader: LSC

Aberdeen Ground Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ANG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: ANG CLAY
has lithology component: ANG CLSH
has lithology component: ANG SANDU
has lithology component: ANG SILT
has source info: ANG_49267
has obsolete equivalent: ANG mn 36
broader: NE
has lower boundary definition: Eroded by pre-Ling Bank and pre-Coal Pit and Forth Formation erosive phases. Base not seen in most seismic sections except near the type borehole. Further to the west, the formation lies on Tertiary and occurs at outcrop.
has geographical distribution: Not defined.
has lithology description: Hard, heavily overconsolidated, commonly fissured, grey clay. Sporadic shell fragments and plant remains. Lenses and laminae of silt and fine-grained sand increasing in content towards the west. [Generic description: 1:50k map margins].
has thickness description: 72.5 metres : maximum of around 130 metres in central part of Devil's Hole area.
has upper boundary definition: See lower boundary.

Arran Northern Granite (Inner Granite)
type: Concept
in scheme: NamedRockUnit
alternative label: ANGI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ANGI GN
broader: NGPA

Arran Northern Granite (Outer Granite)
type: Concept
in scheme: NamedRockUnit
alternative label: ANGO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ANGO GN
broader: NGPA

Argyll And Northern Highlands Granitic Suite
type: Concept
in scheme: NamedRockUnit
alternative label: ANHGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: ANHGR DI
has lithology component: ANHGR DIRAP
has lithology component: ANHGR GD
has lithology component: ANHGR GN
has lithology component: ANHGR GNFO
has lithology component: ANHGR GNR
has lithology component: ANHGR MCDI
has lithology component: ANHGR MCDIF
has lithology component: ANHGR MCGDP
has lithology component: ANHGR MCGN
has lithology component: ANHGR MCGNA
has lithology component: ANHGR MCGNP
has lithology component: ANHGR MCGNPF
has lithology component: ANHGR MLDIH
has lithology component: ANHGR MMZO
has lithology component: ANHGR MZGN
has lithology component: ANHGR MZGP
has lithology component: ANHGR OLPXHB
has lithology component: ANHGR PEG
has lithology component: ANHGR PGGN
has lithology component: ANHGR QDI
has lithology component: ANHGR QZP
has lithology component: ANHGR UMR
broader: Caledonian Supersuite
narrower: SADHI
narrower: Etive Pluton
narrower: Ben Nevis Complex
narrower: LEAT
narrower: Carn Odhar Granite Cupolas
narrower: MUNC
narrower: Foyers Igneous Complex
narrower: Glen Garry Vein Complex
narrower: MIGD
narrower: STRON
narrower: STROS
narrower: LIAN
narrower: LLINN
narrower: Corrieyairack Pluton
narrower: QCHAN
narrower: Balfreish Microgranite
narrower: KMFD
narrower: LAIRG
narrower: Helmsdale Granite
narrower: Cluanie Granodiorite
narrower: Clunes Complex
narrower: STHL
narrower: Glen Orrin Intrusion
narrower: Grugie Pluton
narrower: Allt Crom Complex
narrower: Arbriachan Intrusion
narrower: Auchnahillin Monzonite
narrower: RANH
narrower: RATG
narrower: REAY
narrower: ROMG
narrower: Findhorn Pluton
narrower: Fearn Pluton
narrower: RORT
narrower: Ballachulish Pluton
narrower: Glencoe Ring Intrusions
narrower: Glen Loy Complex

Appinite Suite
type: Concept
in scheme: NamedRockUnit
alternative label: ANITE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: ANITE DIR
has lithology component: ANITE FELAF
has lithology component: ANITE FELAP
has lithology component: ANITE GD
has lithology component: ANITE HBDI
has lithology component: ANITE IBREC
has lithology component: ANITE LMPY
has lithology component: ANITE LMPYFO
has lithology component: ANITE MCGD
has lithology component: ANITE MLDIH
has lithology component: ANITE MLGBRH
has lithology component: ANITE MMZO
has lithology component: ANITE MZ
has lithology component: ANITE PXDI
has lithology component: ANITE UMR
has lithology component: ANITE UMRAF
has lithology component: ANITE UMRAP
broader: Caledonian Supersuite
narrower: Ach'Uaine Cluster

Anabacia Limestones
type: Concept
in scheme: NamedRockUnit
alternative label: ANL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: NE

Andsell Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ANMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
has source info: ANMU_52697
broader: LEMU

Annaclare Group
type: Concept
in scheme: NamedRockUnit
alternative label: ANNA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
broader: NE

Annandale Sandstone Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ANSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ANSD
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43454
has lithology component: ANSA CONG
has lithology component: ANSA SDST
has source info: ANSA_52512
has obsolete equivalent: ANSA mn 92
has obsolete equivalent: ANSA mn 94
has obsolete equivalent: ANSA mn 93
broader: KICM
has lower boundary definition: Conformable on Birrenswark Volcanic Formation.
has geographical distribution: Restricted to the Dalton area of Dumfriesshire (1:50000 Sheets 10 W, Lochmaben and 10 E, Ecclefechan [Scotland]).
has lithology description: Dark red, fine-grained to coarse-grained sandstone and locally derived conglomerate.
has thickness description: 180m
has upper boundary definition: Gradational, passing up into sequence characterised by thin dolomitic limestones (cementstones), sandstones and mudstones.

Anker Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: ANSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: ANSG GRAV
has lithology component: ANSG SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Ashton Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ANSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43455
has lithology component: ANSH MDST
has lithology component: ANSH SDST
has lithology component: ANSH SLST
has source info: ANSH_48818
has source info: ANSH_52690
has source info: ANSH_52918
has source info: ANSH_52971
has obsolete equivalent: ANSH mn 133
has obsolete equivalent: ANSH mn 150
has obsolete equivalent: ANSH mn 152
has obsolete equivalent: ANSH st 56
broader: Dowhills Mudstone Formation
has additional age information: ?Visean to Kinderscoutian.
has lower boundary definition: The lower boundary is taken at the incoming of bluish grey micaceous mudstones with scattered thin sandstones and siltstones of the Ashton Mudstone Member above the fossiliferous interbedded cherts, limestones and mudstones (Posidonia Beds) of the Teign Chert Formation.
has geographical distribution: Teign Valley (SX 84 84), and Exeter (SX 90 92) areas, south Devon. May extend westwards into the Okehampton area (SX 59 94), where it has previously been included in the Crackington Formation, but further investigation is needed.
has lithology description: Greyish blue, rusty-weathering mudstones with scattered thin sooty goniatite-bearing mudstones. Scattered siltstones and sandstones (up to 7cm thick) form less than 10% of the Member. The sandstones are commonly medium-grained, quartzitic and feldspathic and thought to be derived from the south. Plant fragments are locally abundant.
has thickness description: 210-430m
has upper boundary definition: The upper boundary is taken at the gradational incoming of more abundant and relatively thicker sandstones of the overlying Crackington Formation above the mudstones with less than 10% sandstone of the Ashton Mudstone Member.

An Stac Semipelite And Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ANST
has current status: CURRENT
has theme: BEDRCK
notation: AS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43456
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43457
has lithology component: ANST CALSIR
has lithology component: ANST PSAMM
has lithology component: ANST QZITE
has lithology component: ANST SEMPEL
broader: Glen Banchor Succession
has lower boundary definition: Base marked by interbanded garnetiferous quartzite and semipelite above psammites of Creag an Loin Psammite.
has geographical distribution: Central Highlands of Scotland. Newtonmore - Glen Banchor - Kincraig areas.
has lithology description: Striped association of semipelite, psammite and siliceous psammite with subordinate quartzite and calc-silicate rock, variably gneissose.
has thickness description: 200 m +
has upper boundary definition: Invariably marked by a narrow zone of ductile shear overlain by gneissose arkosic psammites of the Creag Liath Psammite.

An Tamhanachd Member
type: Concept
in scheme: NamedRockUnit
alternative label: ANTA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Port Askaig Tillite Formation

Acklinton Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ANTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NSG

Anthracoceratites Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: ANTMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has source info: ANTMB_49246
broader: Bishopston Mudstone Formation
has additional age information: Younger than the Bilinguites superbilinguis Marine Band and older than the Cancelloceras cancellatum Marine Band.
has geographical distribution: Confirmed as present in several areas along the Namurian outcrop of southern Wales, between Druidston in the west and the Twrch Valley in the east (see Ramsbottom et al., 1978, Fig.4).

An Torran Pelite
type: Concept
in scheme: NamedRockUnit
alternative label: ANTOR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ANTOR AMPHB
has lithology component: ANTOR PELGN
has lithology component: ANTOR PSAMM
has lithology component: ANTOR QZITE
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M

Archerbeck Ochre Bed
type: Concept
in scheme: NamedRockUnit
alternative label: AOB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
broader: SMGP

Aonach Beag Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AOBG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43458
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43459
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43460
has lithology component: AOBG AMPHB
has lithology component: AOBG PSAMI
has lithology component: AOBG PSAMM
has lithology component: AOBG QZITE
has lithology component: AOBG SCHT
has lithology component: AOBG SEMPEL
has lithology component: AOBG SPSCH
has source info: AOBG_52636
broader: Appin Group
has lower boundary definition: Boundary between platy feldspathic psammites of the Inverlair Psammite Formation and schistose micaceous psammites and semipelites. Base where micaceous psammite and semipelite become dominant.
has geographical distribution: Ardverikie Forest, southern Central Highlands of Scotland, largely on sheet 63E [Dalwhinnie].
has lithology description: Schistose semipelite and micaceous psammite with white quartzite beds locally abundant in the type area.
has thickness description: Generally to 200m but c.500m in the Aonach Beag area.
has upper boundary definition: Transitional boundary into overlying Kinlochlaggan Quartzite Formation marked by either increasing psammite in locally increasing proportion of interbanded quartzite. Top at point where quartzite becomes dominant.

Athelstan Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AOL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43462
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43461
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43463
has lithology component: AOL LMOOL
has lithology component: AOL LMST
has source info: AOL_48979
has source info: AOL_50034
has source info: AOL_51206
has source info: AOL_51357
has obsolete equivalent: AOL mn 317
broader: Great Oolite Group
narrower: Crapwell Coppice Limestone
has lower boundary definition: South of Horsley [ST 840 975]; rapid passage up from fine-grained slightly argillaceous limestone with ooidal limestone lenses (Tresham Rock Formation), into massive ooid-limestones. Locally a thin grey mudstone bed may intervene. North of Horsley; sharp change up from grey mainly calcareous mudstone (Fuller's Earth Formation), or where absent, from shell-detrital limestone of the Dodington Ash Rock Member (Fuller's Earth Formation), into massive ooid-limestones.
has geographical distribution: Outcrop: Old Sodbury to Cirencester area, Gloucestershire, where the Athelstan Oolite passes into the White Limestone Formation (boundary is taken arbitrarily at the western and southern edges of the 1:50 000 sheet 235 (Cirencester). Subcrop: Hullavington, Wiltshire to Sandpool Farm (Somerford Keynes), Gloucestershire (Wyatt, 1996).
has lithology description: Limestone, white to pale yellow, poorly fossiliferous ooid-grainstones and ooidal limestones, in the southwest they are generally well sorted medium-grained and massive, rarely cross-bedded; in the northeast they become more bioclastic, less well sorted fine- to coarse-grained, commonly cross-bedded. Generally capped by bored, encrusted hardground (mapped on sheets 234 (1972 edition) and 251 (1970 edition) as "chinastone" or "Coppice Limestone" (Cave, 1977)). Lateral passage northeast into peloidal packstones and wackestones of the Ardley Member (White Limestone Formation), and the lower part passes southwestwards by decrease in ooid content into the Tresham Rock Formation.
has thickness description: About 3 to 21m
has upper boundary definition: Bored and oyster encrusted hardground on ooidal limestone, overlain by pale grey, bioclastic ooidal limestones of Chalfield Oolite Formation, or where absent, brown and grey variably ooidal, sandy or muddy bioclastic lime-grainstone/packstone (Forest Marble Formation). Near the formation's southern limit, grey mudstone of the Fuller's Earth Formation intervenes beneath the Chalfield Oolite.

Allt Odhar Peat Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AOPT
has current status: CURRENT
has theme: SPRFCL
notation: AO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43464
has lithology component: AOPT GRAV
has lithology component: AOPT PEAT
has lithology component: AOPT SANDU
has source info: AOPT_50681
has source info: AOPT_50834
has source info: AOPT_52490
has obsolete equivalent: AOPT mn 3119
broader: INVG
has additional age information: ? Early Devensian [see Lithology description].
has lower boundary definition: Sharp, draped, conformable contact with underlying cobble gravel of the Odhar Gravel Formation.
has geographical distribution: Sheet 84W (Fortrose), southeast of Inverness.
has lithology description: Peat highly compressed, black, with lenses of pebbly peaty sand and bleached white sand. Containing beetle remains and pollen indicative of (early Devensian) interstadial conditions
has thickness description: 0.6m
has upper boundary definition: Unconformable, glacitectonic contact with stiff, stony sand/clay diamicton of the overlying Athais Till Formation.

Applethwaite Member
type: Concept
in scheme: NamedRockUnit
alternative label: AP
has current status: CURRENT
has theme: BEDRCK
notation: AP
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OU
has predominant age: OU
has youngest age: OU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43465
has lithology component: AP CASLST
has lithology component: AP LMST
has lithology component: AP MDST
has lithology component: AP SHSST
has source info: AP_49822
has source info: AP_51300
has source info: AP_52930
has obsolete equivalent: AP st 36
has obsolete equivalent: AP st 37
has obsolete equivalent: AP mn 99
has obsolete equivalent: AP mn 98
broader: KKB
has lower boundary definition: Rests with a marked lithological change either on the rhyolitic ignimbrite of the Yarlside Volcanic Formation, or on the concretionary limestone of the Kentmere Member (Kirkley Bank Formation).
has geographical distribution: Southeastern part of the English Lake District, Cumbria, between Coniston [SD 300 980] and the Birkbeck Fells [NY 560 070].
has lithology description: Mainly a calcareous siltstone, although it occurs in graded units that range from a fine-grained sandstone with shelly lag accumulations at the base, to a bioturbated and fine-grained top. Cross-bedding is widespread, and there are rare interbeds of concretionary limestone. The unit is interpreted as a series of storm surge deposits.
has supplementary information: Note that the Applethwaite Member was previously assigned to the Coniston Limestone Formation, a unit that is now redundant and does not equate to the Kirkley Bank Formation.
has thickness description: To about 60m
has upper boundary definition: Overlain by uniform, bioturbated calcareous siltstone of the Torver Member. The top of the Applethwaite Member is taken as the top of the highest graded unit, which is transitional into the overlying and more homogeneous siltstone.

Ailnack Phyllite And Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: APAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43467
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43466
has lithology component: APAL CALSIR
has lithology component: APAL LMST
has lithology component: APAL MLMST
has lithology component: APAL PSAMM
has lithology component: APAL SEMPEL
has source info: APAL_49233
broader: Ballachulish Subgroup
narrower: KYSP
narrower: Glen Suie Limestone Member
narrower: Allt Dregnie Phyllite Member
narrower: TORL
has lower boundary definition: At upper limit of quartzite of the Corryhabbie Quartzite Formation and at lowest occurrence of white limestone or semipelite.
has geographical distribution: Extends from Muckle Allt Venney (Glen Markie) southwest to Glenfiddich, Upper Glenlivet and Glen Suie to the Kylnadrochit-Fodderletter area (Strathavon), Water of Ailnack section and Glen Avon (Burn of Little Fergie to Foal's Crag) and Glen Builg. Southern limit - Loch Builg.
has lithology description: Semipelites with subsidiary psammites, generally phyllitic, more calcareous in its upper part. Distinctive white limestone bands typically. Also grey finely crystalline limestones and calc-silicate bands. In Glenlivet-Glen Suie area divided into three members.
has thickness description: 40 - 600m.
has upper boundary definition: Rapid gradation from calcareous semipelite and limestone to graphitic pelite/semipelite of Clashnoir Semipelite Formation.

Appin Group And Argyll Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: APAR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: APAR CALPL
has lithology component: APAR CALSIR
has lithology component: APAR MLMST
has lithology component: APAR PEGP
has lithology component: APAR PEL
has lithology component: APAR PELGP
has lithology component: APAR PSAMM
has lithology component: APAR QZITE
broader: Dalradian Supergroup

Ardnamurchan Point Gabbro Ring Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: APGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: RI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: APGB GB
broader: Ardnamurchan Centre 2

Appletree Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: APL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: APL LMST
has source info: APL_51867
broader: TYLS
has additional age information: Was formerly considered "S2" (Holkerian).
has geographical distribution: Area around Brampton, Cumbria.
has lithology description: Coral-rich limestone.
has thickness description: c.3.7m

Appin Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: APLI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: APLI LMST
has lithology component: APLI MDOLO
has lithology component: APLI MLMST
has lithology component: APLI PSAMM
has lithology component: APLI QZITE
has lithology component: APLI SPPH
broader: Appin Phyllite And Limestone Formation

Anthracoceras Paucilobum Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: APMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: APMB MDST
broader: MG

Aber Pensidian Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: APMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ON
has lithology component: APMU MDST
has source info: APMU_51485
broader: Dinas Island Formation
has lower boundary definition: Conformable with the sandstones of the Dinas Island Formation.
has lithology description: Dark grey interbedded turbiditic and laminated hemipelagic mudstones.
has thickness description: To 60m
has upper boundary definition: Conformable with the sandstones of the Dinas Island Formation.

Assapol Group
type: Concept
in scheme: NamedRockUnit
alternative label: APOL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lateral equivalent: APOL st 11
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M

Appin Group
type: Concept
in scheme: NamedRockUnit
alternative label: APP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: App
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43468
has lithology component: APP BREC
has lithology component: APP CALSIR
has lithology component: APP DOLMST
has lithology component: APP LMST
has lithology component: APP MLMST
has lithology component: APP PEL
has lithology component: APP PELGP
has lithology component: APP PSAMM
has lithology component: APP QZITE
has lithology component: APP SEMPEL
has source info: APP_50001
has source info: APP_51142
has source info: APP_51764
has source info: APP_52364
has source info: APP_52589
has lateral equivalent: APP st 520
has obsolete equivalent: APP mn 2560
broader: Dalradian Supergroup
narrower: SCLF
narrower: IBGC
narrower: Blair Atholl Subgroup
narrower: Ballachulish Subgroup
narrower: Lochaber Subgroup
narrower: KLLQ
narrower: KTHL
narrower: LOBH
narrower: Aonach Beag Semipelite Formation
narrower: Creeslough Formation And Ards Black Schist (Undifferentiated)
narrower: Ballachulish Subgroup And Blair Atholl Subgroup (Undifferentiated)
has lower boundary definition: Generally rapid transition from monotonous psammite, generally flaggy, with thin quartzite and semipelite units of underlying Grampian Group, to better sorted psammite or quartzite and semipelite or pelite.
has geographical distribution: Connemara; North Mayo; Donegal west of Main Donegal Granite; Lismore to Glen Spean; Kinlochlaggan; Kinloch Rannoch via Glen Shee to Braemar; Glen Livet; Dufftown to Banffshire coast (Findlater Castle to Portsoy). The Appin Group is also roughly equivalent to the Scatsta Division of Shetland.
has lithology description: Alternating units of psammite to quartzite and semipelite to pelite in Lochaber Subgroup. In the Ballachulish and Blair Atholl Subgroups, pelitic and calcareous lithologies dominate, although one clean-washed, locally pebbly quartzite in the Ballachulish Subgroup is persistent from Donegal to Banffshire. Many of the pelitic and calcareous rocks are graphitic.
has thickness description: Typically 4km where untectonised, but thinned sequence (1km or less) occurs over structural highs.
has upper boundary definition: Transition from graphitic semipelite and limestone to psammite and quartzite with rare semipelite, or locally to diamictite.

Applecross Subswarm
type: Concept
in scheme: NamedRockUnit
alternative label: APPC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: UW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: APPC BA
has lithology component: APPC DOLR
has lithology component: APPC MCOLGB
broader: PDNB

Appleton Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: APPE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: APPE COAL
broader: LLGS

Proterozoic To Palaeozoic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: APRZ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: RZ
has lithology component: APRZ METR
broader: NE

Appleby Group, Stewartry Group And Permian Sedimentary Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: APS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NA

Assynt Porphyritic Trachyte Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: APT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Appin Transition Formation
type: Concept
in scheme: NamedRockUnit
alternative label: APTR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: APTR PELGP
has lithology component: APTR QZITE
has lithology component: APTR SPGR
broader: Ballachulish Subgroup

Appleby Group
type: Concept
in scheme: NamedRockUnit
alternative label: APY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: APY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43469
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43471
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43470
has lithology component: APY BREC
has lithology component: APY MDST
has lithology component: APY SDST
has source info: APY_48679
has source info: APY_48719
has source info: APY_49384
has source info: APY_50428
has source info: APY_50552
has source info: APY_50613
has source info: APY_50750
has source info: APY_50988
has source info: APY_51968
broader: NE
narrower: Collyhurst Sandstone Formation
narrower: PS
narrower: KTBR
narrower: THHS
narrower: RHP
narrower: Brockram
narrower: Glendouran Breccia Formation
has lower boundary definition: Strongly unconformable mainly on a range of Carboniferous strata, locally on older formations.
has geographical distribution: Extends from northern part of Solway Basin in the north to northeast part of Cheshire Basin in the south and at least as far west as the Isle of Man and the eastern Irish Sea (Jackson and others, 1987).
has lithology description: Red, aeolian cross-bedded millet-seed sandstone, fluviatile sandstone and breccias ('Brockram') interbedded in varying proportions. In the Collyhurst Sandstone and correlatives grey, white and pale brown colours are also common and breccias are rare. Some interbedded red mudstones are present locally. NOTE: Group includes Penrith Sandstone, Brockram, Rougholme Point Conglomerate, Collyhurst Sandstone, Lockarbriggs Sandstone Formation and Dowell Breccia Formation.
has thickness description: Typically shows large variations over short distances.
has upper boundary definition: Taken at point in sequence where sandstone becomes subordinate to mudstones, siltstones, carbonates and evaporites of the overlying Cumbrian Coast Group (St Bees Evaporites or Manchester Marls formations).

Aqueduct Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: AQC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AQC COAL
broader: PLCM

Ackworth Rock
type: Concept
in scheme: NamedRockUnit
alternative label: AR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: AR SDST
broader: Ackworth Member

Arun Terrace Deposits, 1 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR1
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43472
has lithology component: AR1 C
has lithology component: AR1 S
has lithology component: AR1 V
has lithology component: AR1 VS
has source info: AR1_49405
has source info: AR1_50660
has source info: AR1_50918
has source info: AR1_52506
has obsolete equivalent: AR1 mn 3567
has lateral equivalent: AR1 st 635
broader: Arun Formation
has additional age information: Devensian: OIS 2-4.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the River Arun, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally to 4m, but locally up to 10m
has upper boundary definition: Ground surface.

Arun Terrace Deposits, 2 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR2
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43473
has lithology component: AR2 C
has lithology component: AR2 S
has lithology component: AR2 V
has lithology component: AR2 VS
has source info: AR2_49405
has source info: AR2_50660
has source info: AR2_50918
has source info: AR2_52506
has obsolete equivalent: AR2 mn 3577
has lateral equivalent: AR2 st 635
broader: Arun Formation
narrower: Arun Terrace Deposits, Facet 2a
narrower: Arun Terrace Deposits, Facet 2b
has additional age information: Devensian: OIS 2-4.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the River Arun, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

Arun Terrace Deposits, Facet 2a
type: Concept
in scheme: NamedRockUnit
alternative label: AR2A
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43474
has lithology component: AR2A C
has lithology component: AR2A S
has lithology component: AR2A V
has lithology component: AR2A VS
has source info: AR2A_49405
has source info: AR2A_50660
has source info: AR2A_50918
has source info: AR2A_52506
has obsolete equivalent: AR2A mn 3584
has lateral equivalent: AR2A st 635
broader: Arun Terrace Deposits, 2 Member
has additional age information: Devensian: OIS 2-4.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the Arun River, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Normally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

Arun Terrace Deposits, Facet 2b
type: Concept
in scheme: NamedRockUnit
alternative label: AR2B
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43475
has lithology component: AR2B C
has lithology component: AR2B S
has lithology component: AR2B V
has lithology component: AR2B VS
has source info: AR2B_49405
has source info: AR2B_50660
has source info: AR2B_50918
has source info: AR2B_52506
has lateral equivalent: AR2B st 635
has obsolete equivalent: AR2B mn 3585
broader: Arun Terrace Deposits, 2 Member
has additional age information: Devensian: OIS 2-4.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the Arun River, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

River Terrace Deposits, 2 To 3 (Arun)
type: Concept
in scheme: NamedRockUnit
alternative label: AR2T3
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AR2T3 GRAV
has lithology component: AR2T3 SANDU
broader: Arun Formation
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Arun Terrace Deposits, 3 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR3
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43476
has lithology component: AR3 C
has lithology component: AR3 S
has lithology component: AR3 V
has lithology component: AR3 VS
has source info: AR3_49405
has source info: AR3_50660
has source info: AR3_50918
has source info: AR3_52506
has lateral equivalent: AR3 st 635
has obsolete equivalent: AR3 mn 3586
broader: Arun Formation
has additional age information: Wolstonian: IOS 6-8.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the River Arun, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is prediminantly subangular flint with subordinate debris of chert, polished quartz grain, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

River Terrace Deposits, 3 To 4 (Arun)
type: Concept
in scheme: NamedRockUnit
alternative label: AR3T4
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AR3T4 GRAV
has lithology component: AR3T4 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Arun Terrace Deposits, 4 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR4
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43477
has lithology component: AR4 C
has lithology component: AR4 S
has lithology component: AR4 V
has lithology component: AR4 VS
has source info: AR4_49405
has source info: AR4_50660
has source info: AR4_50918
has source info: AR4_52506
has obsolete equivalent: AR4 mn 3596
has lateral equivalent: AR4 st 635
broader: Arun Formation
has additional age information: Anglian: OIS 12.
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the River Arun, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

River Terrace Deposits, 4 To 5 (Arun)
type: Concept
in scheme: NamedRockUnit
alternative label: AR4T5
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: AR4T5 GRAV
has lithology component: AR4T5 SANDU
broader: Arun Formation
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Arun Terrace Deposits, 5 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR5
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43478
has lithology component: AR5 C
has lithology component: AR5 S
has lithology component: AR5 V
has lithology component: AR5 VS
has source info: AR5_49405
has source info: AR5_50660
has source info: AR5_50918
has source info: AR5_52506
has obsolete equivalent: AR5 mn 3602
has lateral equivalent: AR5 st 635
broader: Arun Formation
has additional age information: Anglian or older Pleistocene: OIS 12-14?
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of the Arun River, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences in the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

Arun Terrace Deposits, 6 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR6
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43479
has lithology component: AR6 C
has lithology component: AR6 S
has lithology component: AR6 V
has lithology component: AR6 VS
has source info: AR6_49405
has source info: AR6_50660
has source info: AR6_50918
has source info: AR6_52506
has obsolete equivalent: AR6 mn 3608
has lateral equivalent: AR6 st 635
broader: Arun Formation
has additional age information: Anglian or older Pleistocene: OIS 12-14?
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of River Arun, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sandy gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences in the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

Arun Terrace Deposits, 7 Member
type: Concept
in scheme: NamedRockUnit
alternative label: AR7
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43480
has lithology component: AR7 C
has lithology component: AR7 S
has lithology component: AR7 V
has lithology component: AR7 VS
has source info: AR7_49405
has source info: AR7_50660
has source info: AR7_50918
has source info: AR7_52506
has obsolete equivalent: AR7 mn 3611
has lateral equivalent: AR7 st 635
broader: Arun Formation
has additional age information: Anglian or older Pleistocene: OIS 12-14?
has lower boundary definition: Unconformably overlies Lower Cretaceous bedrock.
has geographical distribution: Valley of River Arun, Haslemere, Horsham, Chichester district, Sussex.
has lithology description: Sand, sand gravel, and gravel, locally clayey. Gravel component is predominantly subangular flint with subordinate debris of chert, polished quartz grains, and larger fragments of pebbly ferruginous sandstone derived from Lower Cretaceous sequences to the north.
has thickness description: Generally up to 4m, but locally up to 10m.
has upper boundary definition: Ground surface.

Amman Rider Coal, Seven-Feet Coal And Yard Coal (Undifferentiated) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: AR7FY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AR7FY COAL
broader: SWLCM

Armadale Ball Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ARB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARB COAL
broader: LCMS

Aran Boulder Bed Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43481
has lithology component: ARBB BREC
has lithology component: ARBB CONG
has source info: ARBB_50546
has source info: ARBB_52536
broader: Allt Lwyd Formation
has lower boundary definition: Taken at the conformable, diachronous upward passage from volcaniclastic sandstones of the Allt Lwyd Formation into conglomerate. East of the Harlech district it oversteps the lower part of the Allt Lwyd Formation to rest on strata of the Mawddach Group. The boulder bed passes distally into altered feldspathic sandstones.
has geographical distribution: Harlech and Bala districts.
has lithology description: Coarse, massive to graded volcaniclastic conglomerates and breccias comprising pebbles, cobbles and boulders predominantly of intermediate feldspar-phyric lava.
has thickness description: 0 to 300m
has upper boundary definition: Taken at the top of the Allt Lwyd Formation, where it is overlain by extrusive volcanic rocks and volcaniclastic sediments of the Benglog or Offrwm Volcanic formations. The boundary may be conformable or disconformable, represented by a condensed sequence within the Allt Lwyd Formation.

Armadale Ball Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: ARBF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Arbikie Diamicton Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARBI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43482
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43483
has lithology component: ARBI C
has lithology component: ARBI S
has lithology component: ARBI V
has lithology component: ARBI Z
broader: MFT
has additional age information: Probably Devensian.
has lower boundary definition: Overlies sand, reddish-brown, pebbly and compact or unconformably overlies bedrock.
has geographical distribution: Valley of the Gighty Burn, lying north of Arbikie NO 6610 5085 and south of Mountboy NO 6650 5300.
has lithology description: Diamict of red-brown silty, clayey, stoney sand with distictive colour-mottled patches of sand that are intensely weathered lithic clasts that appear dark green, yellow, white, orange in colour. Also partly weathered lithic clasts and unweathered clasts that are matrix-supported in the sand matrix. Unweathered clasts are angular to rounded and lithologies include schist, quartz, white coarse-grained sandstone, red medium-grained sandstone, mafic rock, red-brown sandstone and purple sandstone.
has thickness description: 0.32m to 1.3m
has upper boundary definition: Overlain by diamict of the Mill of Forest Till without the distinctive colour-mottled weathered clasts, or unconformably overlain by recent deposits of alluvium or soil.

Middle Ardwell Beds [Obsolete Name And Code: Use Ard]
type: Concept
in scheme: NamedRockUnit
alternative label: ARBM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Arbriachan Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: ARBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: ARBR GN
broader: Argyll And Northern Highlands Granitic Suite

Anstruther Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ARBS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43486
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43484
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43485
has lithology component: ARBS COAL
has lithology component: ARBS DOLMST
has lithology component: ARBS FEST
has lithology component: ARBS LMST
has lithology component: ARBS MDST
has lithology component: ARBS SAPEL
has lithology component: ARBS SDST
has lithology component: ARBS SLST
has source info: ARBS_48772
has source info: ARBS_51864
has obsolete equivalent: ARBS mn 95
broader: SYG
narrower: Charles Hill Volcanic Member
narrower: RNDL
has lower boundary definition: Not known at outcrop; would be taken at the lithological change from the sandstone dominated sequences of the underlying Fife Ness Formation into relatively mudstone/siltstone-rich cyclical deposits.
has geographical distribution: East Fife.
has lithology description: Mudstone, siltstone and sandstone in thin cycles with thin beds of limestone, dolomite and coal. Predominantly non-marine origin.
has thickness description: Maximum thickness exceeds 810m in east Fife
has upper boundary definition: The conformable top of the Formation lies in a transitional sequence to the Pittenweem Formation and is taken at the base of the Cuniger Rock Marine Band.

Archerbeck Coal (Canonbie)
type: Concept
in scheme: NamedRockUnit
alternative label: ARC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ARC COAL
broader: MCMS

Argyll Carbonate Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARCA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: Halibut Carbonate Formation

Archiestown Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ARCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Amman Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: ARCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARCO COAL
broader: SWLCM

Armadale Coxrod Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ARCX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARCX COAL
broader: LCMS

Ardwell Farm Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ARD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43487
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43488
has lithology component: ARD CONG
has lithology component: ARD MDST
has lithology component: ARD SDST
has lithology component: ARD SLST
has source info: ARD_48694
has source info: ARD_48778
has source info: ARD_48780
has source info: ARD_48781
has source info: ARD_48814
has source info: ARD_49348
has source info: ARD_50759
has source info: ARD_50930
has source info: ARD_52188
has obsolete equivalent: ARD mn 123
has obsolete equivalent: ARD mn 125
has obsolete equivalent: ARD mn 2830
has obsolete equivalent: ARD mn 121
has obsolete equivalent: ARD mn 124
broader: Ardwell Subgroup
narrower: Cascade Conglomerate Member
narrower: PLF
narrower: Bay Member
narrower: Assel Conglomerate Member
narrower: TMS
has lower boundary definition: Rests conformably on Balclatchie Formation.
has geographical distribution: Girvan district, southwest Scotland.
has lithology description: Flaggy wacke.
has thickness description: c.1000m
has upper boundary definition: Underlies the Whitehouse Subgroup (not seen, faulted out).

Ardnamurchan Centre 1
type: Concept
in scheme: NamedRockUnit
alternative label: ARD1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: CE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ARD1 FELS
has lithology component: ARD1 FPMGB
has lithology component: ARD1 GNGP
has lithology component: ARD1 MCGBFP
has lithology component: ARD1 MCQGB
has lithology component: ARD1 QGB
has obsolete equivalent: ARD1 mn 856
broader: Ardnamurchan Central Complex
narrower: Centre 1 Cone-Sheet-Swarm
narrower: MNCG
narrower: MBMG
narrower: MBMQG
narrower: Camphouse Quartz-Dolerite Intrusion
narrower: TNMT
narrower: Ben Hiant Porphyritic Dolerite Intrusion
narrower: Ben Hiant Pitchstone Sheet-Swarm
narrower: Beinn An Leathaid Granodiorite Intrusion

Ardnamurchan Centre 2
type: Concept
in scheme: NamedRockUnit
alternative label: ARD2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: CE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ARD2 FELS
has lithology component: ARD2 GBBY
has lithology component: ARD2 GBHB
has lithology component: ARD2 GBR
has lithology component: ARD2 GNGP
has lithology component: ARD2 MCQGB
has lithology component: ARD2 QGB
has obsolete equivalent: ARD2 mn 857
broader: Ardnamurchan Central Complex
narrower: Centre 2 Inner Basic Cone-Sheet-Swarm
narrower: Centre 2 Outer Basic Cone-Sheet-Swarm
narrower: SMQD
narrower: Beinn Buidhe Older Quartz-Gabbro Intrusion
narrower: LAGB
narrower: Ardnamurchan Point Gabbro Ring Intrusion
narrower: Grigadale Microgranite Intrusion
narrower: Garbh-Dhail Quartz-Gabbro Ring-Intrusion
narrower: Glas Eilean Basaltic Vent

Ardnamurchan Centre 3
type: Concept
in scheme: NamedRockUnit
alternative label: ARD3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: CE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ARD3 GBBBY
has lithology component: ARD3 GBBY
has lithology component: ARD3 GBFLX
has lithology component: ARD3 MCQGB
has lithology component: ARD3 QGB
has lithology component: ARD3 QMZ
has lithology component: ARD3 TO
has obsolete equivalent: ARD3 mn 858
broader: Ardnamurchan Central Complex
narrower: Achnaha Tonalite - Quartz-Monzonite Intrusion
narrower: Centre 3 Basic Cone-Sheet-Swarm
narrower: Centre 3 Layered Gabbro Lopolith
narrower: LCQGB
narrower: MTSQG
narrower: Coire Na Rainich Hybrid Ring-Dyke
narrower: Coire Na Rainich Peridotite Raft
narrower: Beinn Nan Ord Gabbro Ring-Dyke

Ardtun Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ARDB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ARDB COAL
has lithology component: ARDB CONG
has lithology component: ARDB LIGN
has lithology component: ARDB MDST
has lithology component: ARDB SDST
has lithology component: ARDB SLST
broader: NE

Ardmore Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARDC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Ardmore Formation

Ardmore Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARDG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Ardmore Formation

Ardmore Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARDM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Crinan Subgroup
narrower: Ardmore Conglomerate Member
narrower: Ardmore Grit Member

Ardnamurchan Dyke-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: ARDN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: DM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: PDNB

Ardnamurchan Central Complex
type: Concept
in scheme: NamedRockUnit
alternative label: ARDNA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ARDNA MCQGB
broader: Hebridean Province
narrower: MNCND
narrower: Ardnamurchan Centre 1
narrower: Ardnamurchan Centre 2
narrower: Ardnamurchan Centre 3
narrower: Ben Hiant Intrusion

Ardara Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ARDP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has source info: ARDP_51323
broader: NE
has additional age information: K - Ar 392-414 Ma (Pitcher and Berger, 1972).
has geographical distribution: Recognised in the Republic of Ireland.

Ardara Pluton Phase 1
type: Concept
in scheme: NamedRockUnit
alternative label: ARDP1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Ardara Pluton Phase 2
type: Concept
in scheme: NamedRockUnit
alternative label: ARDP2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Ardara Pluton Phase 3
type: Concept
in scheme: NamedRockUnit
alternative label: ARDP3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
has source info: ARDP3_52660
broader: NE
has additional age information: Rb-Sr whole rock 405 +/- 5 Ma (Halliday et al, 1980).
has geographical distribution: Recognised in the Republic of Ireland.

Ardair Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARDR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43489
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43491
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43490
has lithology component: ARDR CALSIR
has lithology component: ARDR PSAMI
has lithology component: ARDR PSAMM
has lithology component: ARDR QZITE
has source info: ARDR_51263
has source info: ARDR_51925
is obsolete equivalent of: ARDR MNSP
broader: Corrieyairack Subgroup
has lower boundary definition: Transitional with underlying micaceous psammites of the Loch Laggan Psammite Formation.Marked by increase in semipelite and thin-banded micaceous psammite content.
has geographical distribution: South-western Monadhliath Highlands, Glen Roy - Glen Banchor, and Adverikie and Ben Alder Forest areas.
has lithology description: Interbedded schistose semipelite and micaceous psammite in roughly equal proportions
has thickness description: 770m in type area.
has upper boundary definition: Sharp to transitional with thinly bedded feldspathic and micaceous psammites of the Creag Meagaidh Psammite Formation

Ardersier Silts Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARDS
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: ARS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43492
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43493
has lithogenesis: GLACI
has lithology component: ARDS CLAY
has lithology component: ARDS DMTN
has lithology component: ARDS GRAV
has lithology component: ARDS SANDU
has lithology component: ARDS SILT
has source info: ARDS_48667
has source info: ARDS_48668
has source info: ARDS_52896
broader: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: KICL
has lower boundary definition: Unseen; on lodgement till or bedrock.
has geographical distribution: Southern shores of the inner Moray Firth, between Inverness and Elgin.
has lithology description: Rhythmically-bedded sequence of silty clays, silts and silty sands, typically graded. Subordinate diamicton and gravel. Origin thought to be glaciomarine.
has thickness description: At least 20m
has upper boundary definition: Gradational contact with Alturlie Gravels Formation above, or unconformable boundary with younger deposits.

Ardverikie Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARDT
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43494
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43495
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43496
has lithology component: ARDT DMTN
has lithology component: ARDT GRAV
has lithology component: ARDT SANDU
has source info: ARDT_51577
broader: Central Grampian Glacigenic Subgroup
has lower boundary definition: Unconformable on (1) Linn of Pattack Silt Formation, or (2) Pattack Till Formation, or (3) bedrock.
has geographical distribution: Whole of Sheet 63E and beyond.
has lithology description: Stony sandy clay diamicton with angular to subrounded clasts up to boulder size; a typical lodgement till. Locally overlying a unit of deformation till derived from the destruction of underlying Linn of Pattack Silt Formation.
has thickness description: <12m
has upper boundary definition: Conformable with units of outwash sand and gravel, morainic deposits or peat, etc.

Ardvreck Group
type: Concept
in scheme: NamedRockUnit
alternative label: ARDV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43497
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43498
has lithology component: ARDV DLGST
has lithology component: ARDV DSDST
has lithology component: ARDV DSLST
has lithology component: ARDV QAREN
has lithology component: ARDV SFAREN
has source info: ARDV_48901
has source info: ARDV_49592
has source info: ARDV_49989
has source info: ARDV_50441
has source info: ARDV_50712
has source info: ARDV_50830
has source info: ARDV_50831
has source info: ARDV_51163
has source info: ARDV_51744
has source info: ARDV_53055
has obsolete equivalent: ARDV mn 1464
broader: NA
narrower: Eriboll Formation
narrower: An T-Sron Formation
has lower boundary definition: The lower boundary is placed where white or pale grey, granule- or pebble-grade quartz arenites/subarkoses of the Basal Quartzite Member (Eriboll Formation) rest unconformably on rocks of the Lewisian Complex or the Torridon Group.
has geographical distribution: The Ardvreck Group forms a narrow belt, extending along the northwestern side of Scotland from the Durness-Eriboll area, through Assynt, Dundonnell, Kinlochewe and Kishorn, to Skye.
has lithology description: The lowest unit of the group is the Basal Quartzite Member (Eriboll Formation), which is cross-bedded, fine- to medium-grained, quartz arenite, although locally the base reaches pebble grade. Compositionally, the basal part is also feldspar rich, up to subarkose in places, but the proportion and grain size decreases rapidly upwards. The unit is overlain by cross-bedded quartz arenites of the Pipe Rock Member (Eriboll Formation), which is a fine- to coarse-grained, quartz arenite with abundant Skolithos burrows at most levels. Localised staining by ferric iron oxide is present in the upper part of the Member, commonly differentially distributed between burrows and matrix. The Eriboll Formation is conformably overlain by dolomitic siltstones, with minor dolomitic grainstones and dolomitic sandstones, of the Fucoid Beds Member (An t-Sron Formation). The Fucoid Beds Member is in turn overlain by the Salterella Grit Member (An t-Sron Formation) which marks a return to cross-bedded quartz arenites containing Skolithos, but also containing abundant agglutinated shells of Salterella.
has thickness description: 93-142m
has upper boundary definition: The upper boundary is placed where dolostones of the Ghrudaidh Formation (Durness Group), which may be locally sandy or muddy, lie conformably on the Salterella Grit Member (An t-Sron Formation) of the Ardvreck Group.

Ardley Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARDY
has current status: CURRENT
has theme: BEDRCK
notation: WhL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43500
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43501
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43499
has lithology component: ARDY LMST
has lithology component: ARDY MDST
has source info: ARDY_48906
has source info: ARDY_49459
has source info: ARDY_49465
has source info: ARDY_50033
has source info: ARDY_50874
has source info: ARDY_51330
has source info: ARDY_51597
has obsolete equivalent: ARDY mn 118
has obsolete equivalent: ARDY mn 4443
broader: WHL
has lower boundary definition: Generally sharp, erosive boundary, with sandy mudstone or sandy limestone ('Roach Bed') overlying Excavata Bed (peloidal packstone) at the top of the Shipton Member.
has geographical distribution: Stroud to Cirencester area of Gloucestershire where it passes south-westwards into the Athelstan Oolite Formation, northeastward through Oxon ando Buckinghamshire to the Brackley area, where it arbitarily passes north-east into the Blisworth Limestone Formation. Restricted to Sheets 217, 218, 219, [234]. 235, 236, 237.
has lithology description: A pale grey to off-white or yellowish limestone, peloidal wackestones and packstones with common ooidal and shell fragmental grainstones, particularly to the southwest of the type area, also recrystallised limestone with beds of argillaceous limestone, sandy limestone, marl and mudstone or clay at some levels.
has thickness description: From 6 m to 10 m thickness - generally increasing thickening to the southwest, and about 7m thick in the type section.
has upper boundary definition: Sharp, eroded and commonly with a hardground top surface of pale grey to white wackestone of the Bladonensis Bed at the top of the Ardley Member, overlain by clay/mudstone marl/limestone of the Bladon Member or the Signet Member, else where these are absent, with a sharp, erosive boundary with cross-bedded shell-fragmental ooidal limestone, or mudstone of the Forest Marble Formation. In the northeast, it is believed to be overlain directly by the Blisworth Clay Formation.

Ardnandave Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ARSF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43502
has lithology component: ARES MMST
has lithology component: ARES MSDST
has lithology component: ARES QZITE
has lithology component: ARES SEMPEL
has obsolete equivalent: ARES mn 393
broader: SOHI
has lower boundary definition: Rapid transition from interbedded semipelite and arenite (Ben Lui Schist Formation) upwards into quartzose arenites. Locally metalimestone (Loch Tay Limestone Formation) is present. Metadolerite sills also intruded along contact zone in type area.
has geographical distribution: Within sheet 38E as currently defined, fringing the Ben Ledi - Ben Vane - Ardnandave Hill massif above Loch Lubnaig and limited to the west side of the Loch Tay Fault.
has lithology description: Metasandstone; arenite, locally quartzose and microconglomerate, with minor semipelite abundant locally.
has thickness description: c.1000m maximum (estimated)
has upper boundary definition: Incoming of chloritic, more matrix-rich greenish to green and commonly rusty weathering arenites and wackes (at the base of the Loch Katrine Volcaniclastic Formation).

Arcow Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ArF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43503
has lithology component: ARF SLST
has source info: ARF_49554
has source info: ARF_50498
has source info: ARF_51972
has source info: ARF_52930
has obsolete equivalent: ARF mn 177
has obsolete equivalent: ARF mn 178
broader: TNTH
has lower boundary definition: Taken at the sharp base of thickly bedded calcareous siltstones overlying laminated siltstones of the Austwick Formation.
has geographical distribution: Restricted to the Craven inliers, North Yorkshire
has lithology description: Medium to pale grey mottled, dominantly calcareous, extensively bioturbated, thickly bedded, "unstriped" siltstone with thin siltstone laminations.
has thickness description: Generally about 10m; but locally up to 35m
has upper boundary definition: Defined by the base of the overlying Horton Formation.

Arch Farm Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARFS
has current status: CURRENT
has theme: BEDRCK
notation: ARFS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43504
has lithology component: ARFS CONG
has lithology component: ARFS MDST
has lithology component: ARFS SDST
has source info: ARFS_50020
has source info: ARFS_50021
broader: NP
has lower boundary definition: A sharp, conformable base of green to grey, fine- to medium-grained sandstone with Lingula, of the Arch Farm Sandstone Formation, above the brown to green-grey medium to coarse-grained sandstone and conglomerate of the Calke Abbey Sandstone Formation; seen as a prominent step on gamma-ray logs.
has geographical distribution: Present in the subsurface in the area of Hathern Shelf, Loughborough District [SK32].
has lithology description: Green to grey, fine- to medium-grained, laminated or cross laminated sandstone in beds up to 1.7m thick, with pebble-rich lenses and shelly lags with Lingula fragments and seams up to several centimetres thick, consisting of green mudstone and siltstone with Lingula. All lithologies are seen as rip-up clasts in the basal parts of the sandstone beds.The upper part of the formation comprises coarse-grained, calcareous sandstone, with pedogenic fabrics, and conglomerate.
has thickness description: Measured as 9 m thick in the Ticknall Borehole, as detailed in the reference stratotype information.
has upper boundary definition: The top of a medium- to coarse-grained pebbly sandstone, overlain by green, slickensided, smectite-rich mudstone with about 4 mm ferruginous concretions of the Arch Farm Sandstone Formation, sharply overlain by pale grey to white calcareous sandstone of the Cloud Hill Dolostone Formation.

Argill Marine Band [Local Name: Use Lsmb]
type: Concept
in scheme: NamedRockUnit
alternative label: ARGMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARGMB MDST
has lateral equivalent: ARGMB LSMB
broader: PLCM

Argyll Group
type: Concept
in scheme: NamedRockUnit
alternative label: ARGY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Argy
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43505
has lithology component: ARGY AMPHB
has lithology component: ARGY BA
has lithology component: ARGY CALSIR
has lithology component: ARGY LMST
has lithology component: ARGY MLMST
has lithology component: ARGY MSDR
has lithology component: ARGY PEL
has lithology component: ARGY PELGN
has lithology component: ARGY PSAMI
has lithology component: ARGY PSAMM
has lithology component: ARGY PSMGN
has lithology component: ARGY QZITE
has lithology component: ARGY SEMPEL
has lithology component: ARGY SPELGN
has lithology component: ARGY VLSS
has source info: ARGY_50001
has source info: ARGY_51142
has source info: ARGY_52364
has source info: ARGY_52589
has obsolete equivalent: ARGY mn 2841
has obsolete equivalent: ARGY mn 2842
broader: Dalradian Supergroup
narrower: Aberdeen Formation
narrower: SBUS
narrower: Beldorney Pelite Formation
narrower: Crinan Subgroup
narrower: Crinan Subgroup And Tayvallich Subgroup (Undifferentiated)
narrower: Easdale Subgroup
narrower: Islay Subgroup
narrower: Kinnairds Head Formation
narrower: Tayvallich Subgroup
narrower: Blackwater Formation
has lower boundary definition: Generally transitional over a few metres at base of tillite of Port Askaig (Schiehallion) Boulder Bed.
has geographical distribution: Scottish Highlands and Islands, and Northern Ireland: see entries for component subgroups.
has lithology description: See descriptions for; Islay Subgroup, Easdale Subgroup, Crinan Subgroup and Tayvallich Subgroup.
has thickness description: Up to 9km
has upper boundary definition: Top of highest limestone bed in Loch Tay Limestone Formation where present; in Glen Clova and Glen Esk below unit with beds of strongly magnetic semipelite.

Abercorn Rough Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: ARHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ARHC COAL
broader: LSC

Argoed Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ArL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43506
has lithology component: ARL DOLO
has lithology component: ARL LMST
has lithology component: ARL MDST
has source info: ARL_48717
has obsolete equivalent: ARL mn 708
broader: Cornelly Oolite Formation
has lower boundary definition: Taken at the base of a bed of grey calcareous mudstone, overlain by thin- to medium-bedded, fine- to coarse-grained crinoidal skeletal packstones, that overlies the clay palaeosol capping the underlying Cefnyrhendy Oolite Member, or the top of the underlying palaeokarstic surface if the clay palaeosol is absent.
has geographical distribution: Northern Vale of Glamorgan [ST 00 74]. Passes southwards into the High Tor Limestone Formation.
has lithology description: Thin- to medium-bedded, fine- to coarse-grained crinoidal skeletal packstones with a bed of grey calcareous mudstone at the base. Dolmitized along the southeast crop of the South Wales Coalfield. Deposited in an offshore platform setting and representing the basal Holkerian transgression.
has thickness description: 10m
has upper boundary definition: Gradational boundary in which the top is taken at the first bed of ooidal grainstone of the Cornelly Oolite Formation above the crinoidal skeletal packstones of the Member.

Ardross Lingula Band
type: Concept
in scheme: NamedRockUnit
alternative label: ARLB
has current status: CURRENT
has theme: BEDRCK
notation: ARLB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43507
has lithology component: ARLB MDST
has source info: ARLB_48772
broader: PDB
has lower boundary definition: Conformable.
has lithology description: Mudstone with Lingula.
has thickness description: 1.22m in type section.
has upper boundary definition: Conformable.

Arbigland Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARLM
has current status: CURRENT
has theme: BEDRCK
notation: ARLM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43508
has lithology component: ARLM LMST
has lithology component: ARLM MDST
has lithology component: ARLM SDST
has lithology component: ARLM SLST
has source info: ARLM_49410
has source info: ARLM_53020
has obsolete equivalent: ARLM mn 103
has obsolete equivalent: ARLM mn 104
has obsolete equivalent: ARLM mn 106
has obsolete equivalent: ARLM mn 105
broader: TYLS
has lithology description: Interbedded marine limestone, siltstone and mudstone with thick cross-bedded, bioturbated medium-grained sandstone.
has thickness description: > 300m
has upper boundary definition: The Arbigland Limestone Member is stratigraphically the highest unit in the district.

Armadale Main Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ARM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARM COAL
broader: LCMS

Armagh Group
type: Concept
in scheme: NamedRockUnit
alternative label: ARMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
broader: NE
narrower: Derryloran Formation

Arley Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: ARMC
has current status: CURRENT
has theme: BEDRCK
notation: AM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARMC COAL
has obsolete equivalent: ARMC mn 135
has lateral equivalent: ARMC st 47
broader: PLCM

Arfon Group
type: Concept
in scheme: NamedRockUnit
alternative label: ARN
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43509
has lithology component: ARN FTUFF
has lithology component: ARN TUFT
has lithology component: ARN VLSS
has source info: ARN_49349
has source info: ARN_49929
has source info: ARN_49930
has source info: ARN_50644
has source info: ARN_52301
has obsolete equivalent: ARN mn 139
has obsolete equivalent: ARN mn 140
broader: NE
narrower: Bangor Formation
narrower: MINF
narrower: ORMF
narrower: PDT
narrower: Baron Hill Formation
narrower: OCO
narrower: Fachwen Formation
has lower boundary definition: Drawn at the base of welded ash-flow tuffs of the Padarn Tuff Formation (base not exposed). (Correlative of Padarn Tuff Formation = Bwlch Gwyn Felsite, Anglesey).
has geographical distribution: Anglesey and Gwynedd, Wales.
has lithology description: Welded, felsic ash-flow tuff, volcanogenic conglomeratic sandstone, fine-grained interlaminated tuffite and tuffaceous sediment.
has supplementary information: The upper part is considered to be of Cambrian age, the lower part is Precambrian or Cambrian.
has thickness description: Almost 4000m - derived from geophysical evidence as base in not exposed.
has upper boundary definition: Drawn at conformable upward passage from siltstone and sandstone of the Fachwen Formation (east of Aber-Dinlle Fault) or tuff and tuffite of the Bangor Formation (west of Aber-Dinlle Fault) to purple-red siltstone of the Llanberis Slates Formation.

Arnage Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ARNA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEBAS

Arenig Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ARNG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has lithology component: ARNG CHRT
has lithology component: ARNG MDST
broader: NP

Abercorris Group
type: Concept
in scheme: NamedRockUnit
alternative label: ARO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43510
has lithology component: ARO MDST
has source info: ARO_49774
broader: NE
narrower: NRV
narrower: Garnedd-Wen Formation
narrower: Broad Vein Mudstone Formation
has lower boundary definition: Drawn at the base of the Red Vein Formation where blue mudstones with orange weathering rest conformably upon mottled mudstones of the Abercwmeiddaw Group.
has geographical distribution: Exposed in the area around Corris and Aberllefenni,(Merionethshire).
has lithology description: Weathered dark blue blocky mudstone, well cleaved homogeneous blue mudstone (slate), dark blue micaceous mudstones often sandy or gritty, weathered to a dull bronze.
has thickness description: 633 metres approx.
has upper boundary definition: Drawn at the conformable upward passage of the Narrow Vein Formation where well cleaved slate passes into a dark blue micaceous sandy and gritty mudstone of the Garwedd-Wen Formation.

Arniston Parrot Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: ARP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ARP COAL
broader: LSC

Ardnave Phyllite And Greywacke Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARPG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ARPG PEL
has lithology component: ARPG QZITE
has lithology component: ARPG SEMPEL
has source info: ARPG_49443
broader: Colonsay Group

Archaean And Proterozoic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ARPR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: AP
broader: NP

Arnbath Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ArPs
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43511
has lithology component: ARPS MDIAMT
has lithology component: ARPS PSAMI
has lithology component: ARPS PSAMM
has lithology component: ARPS QZITE
has lithology component: ARPS SEMPEL
has source info: ARPS_48907
has source info: ARPS_49235
has source info: ARPS_50001
has source info: ARPS_51142
has source info: ARPS_52863
has obsolete equivalent: ARPS mn 1374
broader: Islay Subgroup
narrower: REDQ
has lower boundary definition: Base faulted out in coast section; elsewhere rapid transition is inferred from graphitic semipelites and limestones of Fordyce Limestone Formation.
has geographical distribution: Coast section from Red Haven to 150m southeast of Foul Hole [NJ 563 663-579 666]; extends southwards as far as Newpark [NJ 530 606].
has lithology description: Medium- to thickly-bedded psammite and semipelite; coastal section contains a basal quartzite member; elsewhere locally contains units of 'boulder bed', a metadiamicton with sparse cobble clasts of granitic and metasedimentary rocks.
has thickness description: Increases from c.75m at Newton [542 619] to c.200m at coast, where it is partly repeated by a ductile thrust of the Keith Shear Zone.
has upper boundary definition: Change from interbedded psammite and semipelite to thick-bedded quartzite.

Archaean Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ARRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: AR
has youngest age: AR
broader: NA

Ardingly Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ARS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KV
has predominant age: KV
has youngest age: KV
has lithology component: ARS SDST
broader: LTW

Arley And Exhall Sandstones
type: Concept
in scheme: NamedRockUnit
alternative label: ARSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has lithology component: ARSA SDST
has source info: ARSA_49363
has source info: ARSA_49789
has obsolete equivalent: ARSA mn 134
has obsolete equivalent: ARSA mn 136
broader: WIT

Armadale Slatyband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: ARSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARSI FEST
broader: LCMS

Armadale Splint Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ARSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARSP COAL
broader: LCMS

Aulrothie Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ArS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43512
has lithology component: ARSS CONG
has lithology component: ARSS SDST
has source info: ARSS_50898
has obsolete equivalent: ARSS mn 3908
broader: SPY
has lower boundary definition: Unconformable contact on metamorphic basement.
has geographical distribution: Pathside area (NJ3785 5500) north-eastwards to Braes of Enzie (NJ4000 5995).
has lithology description: Red coarse-grained sandstone with thin pebbly beds.
has thickness description: Approximately 70 metres - lensing.
has upper boundary definition: At base of main conglomerate sequence in Spey Conglomerate Formation.

Armadale Stinking Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ARST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARST COAL
broader: LCMS

Armathwaite Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: ARTH
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Arnhash Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: ARTI
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43513
has lithology component: ARTI DMTN
has lithology component: ARTI GRAV
has lithology component: ARTI SANDU
has source info: ARTI_50626
has source info: ARTI_51486
has source info: ARTI_51559
broader: Essie Till Formation
has lower boundary definition: Overlies the Blackhills Sand and Gravel Formation unconformably.
has geographical distribution: From Elgin to Fraserburgh. Not yet used on any 50k maps.
has lithology description: Reddish brown to brownish grey till or diamicton, deposited by local readvances of the Moray Ice Stream.
has thickness description: 2m
has upper boundary definition: The present land surface.

Offshore Artificial Deposits Not Mapped [For Digital Map Use Only]
type: Concept
in scheme: NamedRockUnit
alternative label: ARTOF
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
broader: NE

Aruisg Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ARU PEPH
has lithology component: ARU PSAMGF
has lithology component: ARU PSAMM
broader: TARS

Armadale Upper Ball Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ARUB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARUB COAL
broader: LCMS

Armadale Upper Cannel Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ARUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ARUC COAL
broader: LCMS

Arun Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ARUN
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43514
has lithology component: ARUN P
has lithology component: ARUN S
has lithology component: ARUN V
has lithology component: ARUN VC
has lithology component: ARUN VS
has source info: ARUN_49405
has source info: ARUN_50660
has source info: ARUN_50918
has source info: ARUN_52506
has obsolete equivalent: ARUN mn 3566
has lateral equivalent: ARUN st 50
broader: SXCAT
narrower: Arun Terrace Deposits, 1 Member
narrower: Arun Terrace Deposits, 2 Member
narrower: River Terrace Deposits, 2 To 3 (Arun)
narrower: Arun Terrace Deposits, 3 Member
narrower: Arun Terrace Deposits, 4 Member
narrower: River Terrace Deposits, 4 To 5 (Arun)
narrower: Arun Terrace Deposits, 5 Member
narrower: Arun Terrace Deposits, 6 Member
narrower: Arun Terrace Deposits, 7 Member
has lower boundary definition: Incises bedrock or older superficial deposits.
has geographical distribution: Valley of the Arun River, Haslesmere, Horsham, Chichester district, Sussex.
has lithology description: River terrace gravels, sands and associated organic sediments.
has thickness description: Average 4m, although may reach 8 to 10m in places.
has upper boundary definition: At surface or overlain by younger deposits including alluvium and head.

Aryleive Limestone Bed
type: Concept
in scheme: NamedRockUnit
alternative label: ARYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43515
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43517
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43516
has lithology component: ARYL LMST
has source info: ARYL_50922
has source info: ARYL_51428
has source info: ARYL_52360
has obsolete equivalent: ARYL mn 1875
has obsolete equivalent: ARYL mn 2756
broader: PSKA
has lower boundary definition: Rests unconformably directly on Caledonian igneous or Precambrian Moine [basement] rocks as the basal unit of the Bighouse Formation on the Middle Old Red Sandstone unconformity. Locally interbedded with conglomerates of the Portskerra Conglomerate Member.
has geographical distribution: Onshore in the Dounreay area of Caithness, northern Scotland.
has lithology description: A thickly-bedded, pale grey, nodular limestone.
has thickness description: From 3.5m to 4.0m
has upper boundary definition: Overlain by interbedded, sandstone-dominated rhythmic sequence of sandstones, siltstones and laminated carbonate mudstones (fish beds) of the Baligill Limestone Member of the Bighouse Formation. At the type section site, however, the unit is instead overlain directly by a thin bed of angular pebbly conglomerate.

Arden Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TC
has predominant age: TC
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43518
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43519
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43521
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43522
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43520
has lithology component: AS CONG
has lithology component: AS MDST
has lithology component: AS SDST
has lithology component: AS SLST
has source info: AS_48671
has source info: AS_48761
has source info: AS_48797
has source info: AS_48817
has source info: AS_49046
has source info: AS_49873
has source info: AS_50189
has source info: AS_50336
has source info: AS_51243
has source info: AS_51286
has source info: AS_51590
has source info: AS_51610
has source info: AS_51674
has source info: AS_51722
has source info: AS_51762
has source info: AS_51853
has source info: AS_52146
has source info: AS_52368
has source info: AS_52591
has source info: AS_52614
has source info: AS_53057
has obsolete equivalent: AS st 250
has obsolete equivalent: AS mn 2015
has obsolete equivalent: AS mn 2017
has obsolete equivalent: AS mn 2200
has obsolete equivalent: AS mn 4590
has obsolete equivalent: AS mn 114
has obsolete equivalent: AS mn 115
has obsolete equivalent: AS st 158
has lateral equivalent: AS st 158
has obsolete equivalent: AS mn 116
has obsolete equivalent: AS mn 1215
has obsolete equivalent: AS mn 3072
has obsolete equivalent: AS mn 4400
broader: MMG
has lower boundary definition: Placed at a rapid upward transition from the red mudstones or siltstones of the Sidmouth Mudstone Formation to the dominantly grey or green, partly or largely arenaceous beds of the Arden Sandstone Formation. Conformable in all areas. At outcrop, the boundary is typically marked by a change from the reddish-brown clayey soils of the Sidmouth Mudstone Formation to the grey, slightly sandy clay soils of the overlying Arden Sandstone Formation. Where the latter forms a marked cuesta feature, the boundary typically lies at a slight concave break in the scarp slope.
has geographical distribution: The outcrop of the Formation is traceable nearly continuously from Gloucestershire northward through Worcestershire and eastwards through Warwickshire into Leicestershire and Nottinghamshire. Less continuous outcrop is mapped in Somerset and east Devon. At subcrop, the Formation is proved in several cored and geophysically logged boreholes in the subsurface in the Central Midlands (Worcester and Knowle basins), East Midlands , and in southern England (Wessex Basin). It is not recognised in the Cheshire Basin and other basins farther northwest, though thin sandstones in the upper part of the Wilkesley Halite (Poole and Whiteman, 1966), might represent the Formation in the Cheshire Basin. At depth in Dorset and Somerset the Formation passes laterally into halite (Gallois, 2001).
has lithology description: Heterolithic, consisting of grey, green and purple mudstones interbedded with paler grey-green to buff coloured siltstones and fine- to medium-grained, varicoloured green, brown, buff, mauve sandstones; beds of conglomerate occur locally. Laminated and thinly interbedded sediments are commonly extensively bioturbated and show structures indicative of thixotropic deformation. The siltstones and finer sandstones show small-scale ripple drift cross bedding; thicker sandstone beds show trough and planar cross bedding. The proportion of fine to coarse clastics varies laterally within the Formation. The thicker sandstone units, composed of several individual beds, have a lenticular geometry and occupy the inferred former courses of fluvial distributary channels in a deltaic or estuarine environment. Less arenaceous, mudstone and siltstone-dominated successions occupy intervening interdistributary areas. The Arden Sandstone Formation is differentiated from the reddish-brown, blocky weathering mudstones of adjacent formations by its predominantly greenish grey colour, the presence of a significant, though often subordinate, proportion of sandstone, and the predominance of finely laminated lithologies throughout.
has thickness description: Typically 7m to 8m in the Warwickshire area near the type section, with a maximum of 20m in the Stowell Park Borehole [SP01SE/1, SP 0835 1176, Green and Melville, 1956] and a minimum, regionally, of 2 to 3m.
has upper boundary definition: Placed at the base of the predominantly red mudstones and siltstones of the Branscombe Mudstone Formation where they rest on the interbedded dark grey-green siltstones and pale grey sandstones of the underlying Arden Sandstone Formation; the boundary is abrupt or a rapid, interbedded transition. At outcrop, the boundary is typically marked by a change from the grey, slightly sandy clay soils of the Arden Sandstone Formation to the reddish-brown clayey soils of the Branscombe Mudstone Formation. Where the Arden Sandstone forms a marked cuesta feature, the boundary lies at the down-dip limit of the dip slope.

Asaphus Ash Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O3
has lithology component: ASA AGG
has lithology component: ASA ANDTFF
has lithology component: ASA MDST
has lithology component: ASA SLST
has source info: ASA_51030
broader: NA
has lower boundary definition: Data unavailable.
has lithology description: Silicified andesitic tuffs and agglomerates with interbedded mudstones and siltstones containing a rich shelly fauna, particularly trilobites
has thickness description: To 25m
has upper boundary definition: Data unavailable.

Aldeby Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASAG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43523
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43524
has lithogenesis: GLACI
has lithology component: ASAG C
has lithology component: ASAG DMTN
has lithology component: ASAG S
has lithology component: ASAG V
has lithology component: ASAG Z
has source info: ASAG_49182
has source info: ASAG_50256
has source info: ASAG_52145
has obsolete equivalent: ASAG mn 62
broader: LOFT
has lower boundary definition: Unconformable, most commonly overlies silt- and clay-rich chalky till (diamicton) of the Lowestoft Formation, but also locally overlies well-sorted sands and gravels of the Crag Group and Happisburgh Formation.
has geographical distribution: Restricted to the valley sides of the River Waveney and Hundred River to the west and south of Lowestoft.
has lithology description: The Aldeby Sand and Gravel Member is lithogically very variable; it is composed predominantly of sand and gravel that also contains lenses of reworked chalky till, discrete beds of clay and silt, reconstituted chalk and masses of sand transported and apparently derived from the Happisburgh Formation. The gravel fraction is composed predominantly of clasts of angular flint with some quartz and quartzite. In places beds of well-rounded flint and quartz gravel are present. The Member is thought to have formed during wastage of the Lowestoft ice from the adjacent higher ground.
has thickness description: Thicknesses are imprecisely known but 18m was exposed at Oaklands Pit, Aldeby and 4m at Aldeby Quarry, (see Stratotypes).
has upper boundary definition: The Aldeby Sand and Gravel is overlain unconformably by variable Head deposits, and peat and silt of the Breydon Formation, and locally by river terrace sand and gravel of the Britannia Catchments Group. The overlying sand and gravel is typically better sorted and more well bedded.

Airth Shellband
type: Concept
in scheme: NamedRockUnit
alternative label: ASB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Assel Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASC
has current status: CURRENT
has theme: BEDRCK
notation: ASC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43525
has lithology component: ASC CONG
has source info: ASC_48694
has source info: ASC_50759
has source info: ASC_52760
has obsolete equivalent: ASC mn 155
broader: Ardwell Farm Formation
has lower boundary definition: Base of conglomerate, resting on flaggy sandstone.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: A localized thick conglomerate within the generally flaggy Ardwell Farm Formation.
has thickness description: To 70m
has upper boundary definition: Taken at top of conglomerate, overlain by flaggy sandstone.

Ardscalpie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASCP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: TROS
narrower: LDHU
narrower: QHGR
has additional age information: Early Cambrian to Early Ordovician.

Ashdown Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KV
has obsolete equivalent: ASD mn 142
has obsolete equivalent: ASD mn 143
broader: Hastings Beds (Subgroup)

Ashover Grit
type: Concept
in scheme: NamedRockUnit
alternative label: ASG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: ASG MDST
has lithology component: ASG SDST
has lithology component: ASG SLST
has source info: ASG_50404
has obsolete equivalent: ASG mn 4167
is obsolete equivalent of: ASG COG
broader: MARSD
has lower boundary definition: The base of the first main sandstone or sandstones above the Bilinguites Marine Band. If no Marine Bands are proved it is the base of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group.
has geographical distribution: Derbyshire, Leicestershire, Nottinghamshire.
has lithology description: Massive or cross-bedded, medium to coarse grained, often pebbly and feldspathic sandstone.
has thickness description: Up to 213 m thick.
has upper boundary definition: The top of the first main sandstone or sandstones below the Bilinguites Marine Band. If no Marine Bands are proved it is the top of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group.

Ashover Grit (Main Bed)
type: Concept
in scheme: NamedRockUnit
alternative label: ASGM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: ASGM SDST
broader: MARSD

Acton Scott Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASGP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OT
has predominant age: OT
has youngest age: OT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43526
has lithology component: ASGP LMST
has lithology component: ASGP SDST
has lithology component: ASGP SLMDST
has lithology component: ASGP SLST
has source info: ASGP_49336
has source info: ASGP_51093
has source info: ASGP_51545
has obsolete equivalent: ASGP mn 47
broader: NP
narrower: Acton Scott Limestone
has lower boundary definition: Drawn at the base of the Acton Scott Formation where mudstone facies rest conformably on blocky and rubbly mudstones and siltstones of the Cheney Longville Flags.
has geographical distribution: Caradoc - Wrekin District, Shropshire.
has lithology description: Grey rubbly micaceous silty mudstones with siltstone bands, in places orange-stained and weathering shaly.
has thickness description: c.60m near Church Stretton to c.150m in the Caradoc (south) area.
has upper boundary definition: Drawn at the conformable upward passage of the Acton Scott Formation where the division from the overlying Onny Shales has been based on palaeontological grounds because of difficulty differentiating.

Ashbourne Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: ASGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43527
has lithogenesis: GLACI
has lithology component: ASGR GRAV
has lithology component: ASGR SANDU
has source info: ASGR_50614
broader: NP
has lower boundary definition: Pronounced irregular unconformity on underlying, mainly Triassic bedrock.
has geographical distribution: Sporadic outcrops extend from a location 750m due west of Spitalhill, northwards to 800m SW of Sandybrook Hall (SK 173 456 to SK 175 476).
has lithology description: Coarse gravel, hard and with a calcite cement,with abundant pebbles and cobbles of more than 55% Carboniferous limestone, 8 - 29% Carboniferous sandstone and minor proportions of quartzite and quartz. Interbedded with cemented quartzose sand.
has thickness description: Variable, locally up to 2.8m
has upper boundary definition: Locally overlain by till (Quaternary).

Ashton Great Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ASGT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ASGT COAL
broader: SWLCM

Abbey Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ASh
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43528
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43529
has lithology component: ASH LMST
has lithology component: ASH MDST
has lithology component: ASH SDST
has source info: ASH_48798
has source info: ASH_51605
broader: SSH
has lower boundary definition: Not penetrated in the borehole. Base gradational with Purley Shale Formation in partial type section.
has geographical distribution: North-west suburbs of Nuneaton, extending north-westwards to the southern suburbs of Atherstone (SP3530 9180 - SP3063 9712).
has lithology description: Dark grey, greenish or blueish black mudstones with thin beds of limestone and glauconitic sandstone. Locally with phosphate, pyrite and siderite nodules.
has thickness description: 10-40 m. 109 feet (33.2m) minimum in reference section.
has upper boundary definition: A stratigraphical discontinuity. Upper dark phosphatic mudstone bed is sharply overlain by basal pebble conglomerate of Mancetter Formation.

Ashdown Beds (B) [Obsolete Code: Use Asd]
type: Concept
in scheme: NamedRockUnit
alternative label: ASHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KV
broader: NE
has supplementary information: The bracketed letter (B) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Ashclough Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: ASHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ASHC COAL
has lateral equivalent: ASHC st 52
has obsolete equivalent: ASHC mn 141
broader: PMCM

Ashover Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ASHCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: ASHCO COAL
broader: MG

Ashington High Main Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: ASHI
has current status: CURRENT
has theme: BEDRCK
notation: Ashi
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ASHI COAL
broader: PMCM

Ashgill Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ASHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Ashington Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: ASHN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ASHN COAL
has lateral equivalent: ASHN st 252
has lateral equivalent: ASHN st 877
broader: PMCM

Ardtrea Sill
type: Concept
in scheme: NamedRockUnit
alternative label: ASI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

An Sithean Granite
type: Concept
in scheme: NamedRockUnit
alternative label: ASIG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: ASIG GNGP
broader: SKYC

Askham Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AskL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43530
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43531
has lithology component: ASKL LMST
has lithology component: ASKL MDST
has source info: ASKL_50122
has source info: ASKL_50428
has source info: ASKL_50534
has source info: ASKL_52813
has source info: ASKL_52989
has lateral equivalent: ASKL st 721
has obsolete equivalent: ASKL mn 154
broader: Alston Formation
has lower boundary definition: Sharp base of limestone bed on the underlying Wintertarn Sandstone Member.
has geographical distribution: North Cumbria and Edenside, west of the Pennine-Dent Fault Zone.
has lithology description: Limestone, dark grey, well-bedded, wackestone and packstone, porcellanous in parts. Prominent layers with algal oncoliths and coral colonies. The member is split into 2 leaves by a thin layer of red-brown mudstone.
has thickness description: 12 - 14.7m.
has upper boundary definition: Taken at the base of overlying shelly marine mudstone within the Alston Formation Yoredale depositional cycle.

Acton Scott Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: ASL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: ASL LMST
has lithology component: ASL SALMST
broader: Acton Scott Formation
has thickness description: c.25m

Aston Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AsL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43532
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43533
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43534
has lithology component: ASLS CAMDST
has lithology component: ASLS LMST
has lithology component: ASLS SALMST
has lithology component: ASLS SDST
has source info: ASLS_48896
has source info: ASLS_48908
has source info: ASLS_49459
has source info: ASLS_50047
has source info: ASLS_50049
has source info: ASLS_50050
has source info: ASLS_50324
has source info: ASLS_50541
has source info: ASLS_51129
has source info: ASLS_51352
has source info: ASLS_51751
has source info: ASLS_51928
has source info: ASLS_52502
has obsolete equivalent: ASLS mn 1936
has obsolete equivalent: ASLS mn 2856
broader: INO
narrower: NGRV
narrower: LTG
narrower: Gryphite Grit Member
narrower: ROBA
has additional age information: Discites Zone to Sauzei Zone.
has lower boundary definition: Disconformity: upward change from ooidal and peloidal limestone (Scottsquar Member) or sand, mudstone and sandy limestone (Harford Member) into limestone as in lithological description. Generally marked by a hardground.
has geographical distribution: North and mid-Cotswolds: west of Northleach, Cold Aston and Blockley, and northeast of Stroud, Gloucestershire. Present locally outside this area to the south of Cold Aston, and absent between Birdlip and Cirencester ('Birdlip Anticline'). (Barron, A J M, et al, 1997, fig.4).
has lithology description: Grey and brown variously shelly, ooidal, sandy, shell-detrital and bioturbated limestones; rubbly in parts, with sandy and shell-detrital marl beds. Component members: Lower Trigonia Grit, Gryphite Grit, Notgrove, Rolling Bank.
has thickness description: Type section up to about 6.45m. Maximum c.22m (Cleeve Hill area).
has upper boundary definition: Disconformity: hardground: limestone as in lithological description, overlain by Salperton Limestone Formation.

Ashton Little Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ASLT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ASLT COAL
broader: SWLCM

Alteen Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: NE

Abercorn Steam Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: ASMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ASMC COAL
broader: LSC

Ascog Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASO
has current status: CURRENT
has theme: BEDRCK
notation: ASO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43535
has lithology component: ASO SDST
has lithology component: ASO SLST
has source info: ASO_50587
broader: Clyde Sandstone Formation
has lower boundary definition: Seen where grey-white fine-grained calcareous sandstone of the Ascog Member is interbedded with grey mudstone and dolomitic limestone (cementstone) of the Ballagan Formation. The boundary is picked where beds of dolomitic limestone (cementstone) are absent and sandstone becomes the dominant lithology.
has geographical distribution: Isle of Bute in Strathclyde, Scotland.
has lithology description: Red brown siltstone and sandstone with pedogenic limestone.
has thickness description: 86m
has upper boundary definition: Seen as a sharp change at the probably erosional base of the overlying Birgidale Formation, which comprises mudstone, sandstone, seatrock and coal.

An Socach Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ASQ QZITE
has lithology component: ASQ QZTPB
has source info: ASQ_48864
has source info: ASQ_50001
has source info: ASQ_51786
has lateral equivalent: ASQ st 95
has lateral equivalent: ASQ st 34
broader: Ballachulish Subgroup

An T-Sron Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43537
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43536
has lithology component: ASR ARRD
has lithology component: ASR DOLO
has lithology component: ASR DSLST
has lithology component: ASR QAREN
has lithology component: ASR SDST
has source info: ASR_48901
has source info: ASR_49592
has source info: ASR_49989
has source info: ASR_50473
has source info: ASR_50712
has source info: ASR_51799
has source info: ASR_52035
has source info: ASR_52639
has source info: ASR_52897
has obsolete equivalent: ASR mn 3230
has obsolete equivalent: ASR mn 2885
broader: Ardvreck Group
narrower: Fucoid Beds Member
narrower: SLGT
narrower: SGQ
has lower boundary definition: Conformably overlies the Pipe Rock Member of the Eriboll Formation.
has geographical distribution: The An t-Sron Formation forms a narrow, discontinous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt, Dundonnell, Kinlochewe and Kishorn, to Skye.
has lithology description: Consists of two distinctive members: dolomitic brown-coloured siltstone, mudstone and sandstone (of the Fucoid Beds Member, and white quartzite and quartz arenite of the Salterella Grit Member.
has thickness description: From 20 to 50 m thick.
has upper boundary definition: Conformably overlain by dark grey dolostones of the Ghrudaidh Formation of the Durness Group.

Avill Slates And Sandstones Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: IFS

Ashbank Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASSM
has current status: CURRENT
has theme: BEDRCK
notation: ASSM
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43538
has lithology component: ASSM CONG
has lithology component: ASSM PESST
has lithology component: ASSM SDST
has source info: ASSM_51892
broader: SCN
has lower boundary definition: The base of the lowest bed of sandstone in the Hatton Conglomerate Member in the vicinity of Ashbank House.
has geographical distribution: Blairgowrie area.
has lithology description: Predominantly a reddish-brown sandstone with thin beds of pebbly sandstone and conglomerate.
has thickness description: 150 m thick.
has upper boundary definition: The base of the lowest bed of conglomerate, overlying bedded sandstones in the vicinity of Ashbank House.

Asta Spilitic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ASSP MLAVA
has lithology component: ASSP MTUF
has obsolete equivalent: ASSP mn 158
broader: Clift Hills 'Division'

Aston Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AST
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43539
has lithology component: AST MDST
has source info: AST_52218
has obsolete equivalent: AST mn 161
broader: NP
narrower: Edgton Limestone Member
has lower boundary definition: Upwards change in lithology for grey well-bedded (shaly) mudstone to grey thickly bedded (blocky) mudstone.
has geographical distribution: Not defined.
has lithology description: Grey thickly bedded (blocky) mudstone, commonly bioturbated.
has thickness description: c.100m (lateral variations from about 100 - 275m).
has upper boundary definition: See Bishopsmoat Beds, Lower.

Astarte Bed
type: Concept
in scheme: NamedRockUnit
alternative label: ASTA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: LC

Abercorn Splint Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: ASTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ASTC COAL
broader: LSC

Assynt Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASTI
has current status: CURRENT
has theme: SPRFCL
notation: AST
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43540
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43541
has lithology component: ASTI CZSVB
has lithology component: ASTI DMTN
has source info: ASTI_52745
broader: NWHG
narrower: STTI
narrower: LLNN
narrower: SGTI
narrower: UPTI
narrower: TRTI
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Patchy, discontinuous extent across Wester Ross and western Sutherland, west of the main Highland watershed.The Assynt Till Formation is composed of the following geographically distinct, mappable, members: Unapool Till Member, predominantly overlying Lewisian gneiss; Loch Lurgain Till Member, predominantly overlying Torridon Group sandstone; Allt Sgiathaig Till Member, predominantly overlying Eriboll Formation sandstone (quartzite); Traligill Till Member, predominantly overlying Durness Group limestone; and Allt an t-Strathain Till Member, predominantly overlying Moine Supergroup psammite.
has lithology description: Heterogeneous orange-brown to dark grey diamicton with wide ranging sedimentological properties, containing a diverse suite of clast lithologies including Lewisian gneiss, Torridon Group sandstone, Eriboll Formation sandstone (quartzite), Moine Supergroup psammite, Durness Group limestone, Canisp porphy, Borralan syenite and other minor igneous rocks. Orange-brown to dark grey poorly sorted diamicton ranging in texture from poorly consolidated, immature, stony till to over-consolidated, silt-rich, lodgement till. The till is typically autochthonous, being largely derived from the underlying bedrock, however it may also contain reworked glaciofluvial and/or morainic deposits of Devensian age or older.
has thickness description: Variable, ranges from 0.5-78m (maximum observed thickness).
has upper boundary definition: Overlain locally by Holocene (Flandrian) deposits, typically peat or (glacio)fluvial gravel.

Astell Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: ASTL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ASTL COAL
broader: SWLCM

Aston Coal (Oxfordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: ASTN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: ASTN COAL
broader: NE

Ashton Top Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ASTP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ASTP COAL
broader: SWLCM

Ardalanish Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASTR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ASTR CALSIR
has lithology component: ASTR PEL
has lithology component: ASTR PELH
has lithology component: ASTR PSAMM
has lithology component: ASTR PSH
has lithology component: ASTR SEMPEL
has source info: ASTR_49982
broader: Glenfinnan Group

Arthur's Seat Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ASV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43542
has lithology component: ASV BA
has lithology component: ASV BAOM
has lithology component: ASV BAPOCM
has lithology component: ASV BAROCM
has lithology component: ASV BARPM
has lithology component: ASV BARPMA
has lithology component: ASV LAVA
has lithology component: ASV MUG
has lithology component: ASV SR
has lithology component: ASV TUF
has source info: ASV_49223
has source info: ASV_51455
has obsolete equivalent: ASV mn 138
broader: SYG
has lower boundary definition: Base of volcanic rocks on sedimentary rocks of Inverclyde Group (Ballagan Formation).
has geographical distribution: Mainly conjectural; thins in all directions.
has lithology description: The predominant rock types are basaltic lavas and tuffs and mugearite lavas; subordinate interbedded sedimentary rocks also occur.
has thickness description: c.300m
has upper boundary definition: Top of volcanic rocks below sedimentary rocks of Gullane Formation.

Asfordby Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ASVO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: ASVO BALAVA
has lithology component: ASVO BATUF
broader: NE

Allesley Member
type: Concept
in scheme: NamedRockUnit
alternative label: ASY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Asy
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43543
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43544
has lithology component: ASY CONG
has lithology component: ASY MDST
has lithology component: ASY SDST
has source info: ASY_49363
has source info: ASY_49789
has source info: ASY_49953
has source info: ASY_50812
has source info: ASY_51419
has obsolete equivalent: ASY mn 1088
has obsolete equivalent: ASY mn 69
broader: SAL
narrower: Allesley Sandstones And Conglomerates
has lower boundary definition: Taken at the junction between the highest sandstone package in the Keresley Member (Corley Sandstone) and the overlying mudstone unit.
has geographical distribution: Warwickshire Coalfield (Sheet 169). Also likely to extend in the subcrop across the southern part of the Coalfield (Sheet 184).
has lithology description: Redbed sequence; mudstone-dominated at base but becoming more arenaceous towards top. Impersistent conglomerates at some levels.
has thickness description: c.140m
has upper boundary definition: Defined at the incoming of mudstones of the essentially argillaceous Tile Hill Mudstone Formation.

Abercorn Stony Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: ASYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ASYC COAL
broader: LSC

Acton Turville Beds
type: Concept
in scheme: NamedRockUnit
alternative label: AT
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: AT LMOOL
broader: Forest Marble Formation
has geographical distribution: Locally developed north of Bath, from Biddestone to Didmarton.

An Tamhanachd Member And Beannan Buidhe Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ATBB
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Port Askaig Tillite Formation

Allt-Tair-Ffynnon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ATF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OY
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OL
has lithology component: ATF MDST
has lithology component: ATF SDST
broader: NP

Ayr Twenty Fathom Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ATFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ATFC COAL
broader: LCMS

Arbuthnott-Garvock Group
type: Concept
in scheme: NamedRockUnit
alternative label: ATGK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ATGK
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43547
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43548
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43549
has lithology component: ATGK AND
has lithology component: ATGK ANDLAV
has lithology component: ATGK ANDR
has lithology component: ATGK BA
has lithology component: ATGK BAANDT
has lithology component: ATGK BALAVA
has lithology component: ATGK CONG
has lithology component: ATGK LAVA
has lithology component: ATGK LMSTN
has lithology component: ATGK MDST
has lithology component: ATGK RYLAVA
has lithology component: ATGK SDST
has lithology component: ATGK SLST
has lithology component: ATGK TRAND
has lithology component: ATGK TUF
has lithology component: ATGK VCSST
has source info: ATGK_48854
has source info: ATGK_49343
has source info: ATGK_49424
has source info: ATGK_49428
has source info: ATGK_49907
has source info: ATGK_49979
has source info: ATGK_50412
has source info: ATGK_50709
has source info: ATGK_51629
has source info: ATGK_51673
has source info: ATGK_51883
has source info: ATGK_52093
has source info: ATGK_52227
has obsolete equivalent: ATGK mn 111
has obsolete equivalent: ATGK mn 1693
broader: NP
narrower: Am Binnein Sandstone Formation
narrower: SACR
narrower: SCN
narrower: BWST
narrower: Catterline Conglomerate Formation
narrower: CDC
narrower: MVF
narrower: OVF
narrower: POCR
narrower: The Bastard Sandstone Formation
narrower: Craig Of Monievreckie Conglomerate Formation
narrower: NWO
narrower: Glenramskill Formation
narrower: Basal Quartz Sandstone Formation
narrower: Auchencar Sandstone Formation
narrower: Craighall Conglomerate Formation
narrower: RLF
narrower: Deep Conglomerate Formation
narrower: Dundee Flagstone Formation
narrower: GCGF
has lower boundary definition: Diachronous, rising to higher levels towards the southwest. In the type area it lies at the top of the highest lava of the Crawton Volcanic Formation, where this is overlain by clast-supported conglomerate. Elsewhere its base is taken to lie at the eroded top of the Lintrathen Tuff Member or its presumed correlatives (cf. Paterson and Harris, 1969). Where these horizons are absent, on Sheets 66E and 67, the base has been taken at the base of the lowest of the series of andesitic lavas that characterise the lower part of the Group in this area.
has geographical distribution: Northern Midland Valley of Scotland, Arran to Stonehaven.
has lithology description: Sandstone predominates, interbedded with clast-supported conglomerate with well-rounded boulders, cobbles and pebbles predominantly of lava, psammite and quartzite in the northeast and adjacent to the Highland Boundary Fault. Siltstone and mudstone are interbedded with the sandstone, e.g. in the Dundee area and Strathallan. Piles of andesitic, basaltic and rhyolitic lavas, locally very thick, are interbedded with conglomerate and sandstone in many areas. Lenses and thicker formations of volcaniclastic sandstone are interbedded with conglomerate in the Stonehaven area and are associated with lavas elsewhere. Calcrete near top in many areas.
has thickness description: Variable; 2400 to 3150m in the Stonehaven area. The sedimentary rocks thin to the southwest, but in the Stirling area the Ochil Volcanic Formation alone reaches 2400m.
has upper boundary definition: At the base of bright red, massive poorly sorted siltstone and sandy siltstone of the Cromlix Mudstone Formation, overlying coarser-grained sandstone or conglomerate of the Arbuthnott-Garvock Group. Locally diachronous in areas adjacent to the Highland Boundary Fault where conglomerate interfingers with the Cromlix Mudstone Formation.

Arbuthnott-Garvock Group And Strathmore Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ATGKS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: ATGKS AND
has lithology component: ATGKS ANDLAV
has lithology component: ATGKS ANDR
has lithology component: ATGKS BA
has lithology component: ATGKS BAANDT
has lithology component: ATGKS BALAVA
has lithology component: ATGKS CONG
has lithology component: ATGKS LAVA
has lithology component: ATGKS LMST
has lithology component: ATGKS LMSTN
has lithology component: ATGKS MDST
has lithology component: ATGKS RYLAVA
has lithology component: ATGKS SDST
has lithology component: ATGKS SLST
has lithology component: ATGKS TRAND
has lithology component: ATGKS TUF
has lithology component: ATGKS VCSST
broader: NP

Athelstaneford Sill
type: Concept
in scheme: NamedRockUnit
alternative label: ATHFD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: ATHFD TR
broader: MVFEL

Atlantean Supersuite
type: Concept
in scheme: NamedRockUnit
alternative label: ATLAN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SS
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE
narrower: HSSV
narrower: Celtic Palaeogene Minor Intrusion Suite

Ayr Thirty Six Fathom Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ATS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ATS COAL
broader: LCMS

Ayr Twenty Three Fathom Coal
type: Concept
in scheme: NamedRockUnit
alternative label: ATTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ATTF COAL
broader: LCMS

Athais Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ATTI
has current status: CURRENT
has theme: SPRFCL
notation: ATH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43551
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43550
has lithology component: ATTI CLAY
has lithology component: ATTI DMTN
has lithology component: ATTI GRAV
has lithology component: ATTI SANDU
has lithology component: ATTI SILT
has source info: ATTI_50681
has source info: ATTI_50834
has source info: ATTI_52490
has obsolete equivalent: ATTI mn 1208
has obsolete equivalent: ATTI mn 2959
has obsolete equivalent: ATTI mn 2958
broader: INVG
has lower boundary definition: Sharp, undulating or planar, glacitectonic, unconformable contact with white, sandy, organic deposits of the Dalcharn Palaeosol Formation, compressed peat of the Allt Odhar Peat Formation, or bedrock.
has geographical distribution: Sheet 84W (Fortrose), SE of Inverness.
has lithology description: Stoney clayey sand diamicton, matrix-supported, moderate brown to yellowish brown, extremely compact, containing clasts of Devonian sandstone and siltstone, with some psammite, granite and schist. Many clasts are weathered, with orange weathering rinds. Mainly massive lodgement till, but contains lenses of stratified gravelly sandy diamicton and bedded sandy gravel. Locally includes a bed of glacitectonite at the base (Allt Odhar site).
has thickness description: 10m
has upper boundary definition: Either a gradational contact with dark yellowish brown to olive grey stony sandy clay diamicton of the overlying Beinn an Uain Till Formation or a sharp, glacitectonic, boundary with some wedge structures filled by that till.

Ancestral Thames River Terrace Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ATTU
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: ATTU GRAV
has lithology component: ATTU SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Abercorn Turf Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: ATUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ATUC COAL
broader: LSC

Appletree-Worth Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ATW
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: AtW
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Austwick Formation And Arcow Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AUAR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has lithology component: AUAR AROC
has lithology component: AUAR SDST
broader: NA
has lithology description: See the Lithology descriptions for the component formations.

Auchensoul Bridge Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AUB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43552
has lithology component: AUB CAMDST
has source info: AUB_52655
broader: Barr Group
has lower boundary definition: Conformably overlies Kirkland Conglomerate.
has geographical distribution: Not defined.
has lithology description: Reddish-grey and greenish-grey silty calcareous mudstones.
has thickness description: 30 metres.
has upper boundary definition: Conformably overlain by Stinchar Limestone, lateral equivalent of Auchensoul Limestone and perhaps Confinis Flags.

Auchtitench Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AUC
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43553
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43554
has lithology component: AUC ANDLAV
has lithology component: AUC BA
has lithology component: AUC MDST
has lithology component: AUC SDST
has lithology component: AUC SLST
has lithology component: AUC VCCNG
has lithology component: AUC VCSST
has source info: AUC_51434
has source info: AUC_51619
has source info: AUC_51673
has obsolete equivalent: AUC mn 176
broader: LNK
narrower: WGVS
narrower: LABN
narrower: Dungavel Hill Conglomerate Member
has lower boundary definition: The base of the substantial thickness in excess of 30m of volcanogenic sandstones and conglomerates above the andesitic volcanic pile of the Duneaton Volcanic Formation seen in Duneaton Water in the New Cumnock area, and above the Biggar Formation in the Biggar area.
has geographical distribution: Ayrshire and Lanarkshire, and between the Ayrshire Coalfield and the Pentland Hills.
has lithology description: Yellow to red-brown, medium- and coarse-grained, poorly-sorted volcaniclastic sandstones with pebble beds and substantial interbeds of andesitic lava pebble conglomerates, and thin fine-grained sandstone, siltstone, mudstone and andesitic and basaltic lava beds.
has thickness description: Estimated to be up to at least 1800 m thick along the Duneaton Water, where the youngest beds lie in the core of a syncline.
has upper boundary definition: The unconformity with the overlying Upper Devonian-Carboniferous strata, exposed in the burn north of Clocklowie Hill at NS 696 179, below a cornstone bed.

Auchinlea Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: AUCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Auchnahillin Monzonite
type: Concept
in scheme: NamedRockUnit
alternative label: AUCHN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: AUCHN MZ
broader: Argyll And Northern Highlands Granitic Suite

Auchencrow Burn Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AUCR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43555
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43556
has lithology component: AUCR CONG
has lithology component: AUCR LMSTN
has lithology component: AUCR MDST
has lithology component: AUCR PESST
has lithology component: AUCR SDST
has lithology component: AUCR SLST
has lithology component: AUCR TUF
has source info: AUCR_48966
has source info: AUCR_51673
has obsolete equivalent: AUCR mn 169
has obsolete equivalent: AUCR LORS
broader: REST
has lower boundary definition: The top of the Eyemouth Volcanic Formation.
has geographical distribution: The Eyemouth area, along the Eye valley between Ayton and Reston.
has lithology description: Reddish brown coarse-grained to pebbly sandstones with intercalated tuffs, siltstones and mudstones, local conglomerates and one thin cornstone.
has thickness description: At least 430 m and probably up to 1400 m thick.
has upper boundary definition: The unconformity with the overlying Devono-Carboniferous conglomerates.

Auchenheath Dross Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AUDR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: AUDR COAL
broader: LSC

Austwick Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AuF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43557
has lithology component: AUF SDST
has lithology component: AUF SLST
has source info: AUF_49554
has source info: AUF_50498
has source info: AUF_50748
has source info: AUF_52930
has obsolete equivalent: AUF mn 178
broader: TNTH
has lower boundary definition: Taken at the base of carbonaceous siltstones that are overlain by turbiditic sandstones. Oversteps Crummack Formation and Ashgill strata to overlie the Ingleton Group.
has geographical distribution: Restricted to the Craven Inliers, North Yorkshire.
has lithology description: Parallel bedded turbiditic sandstones separated by laminated siltstone. Laminated argillaceous siltstone up to 80m thick at base contain an abundant graptolite fauna indicative of the Sheinwoodian Stage of the Wenlock.
has thickness description: Up to 600m
has upper boundary definition: Defined by the base of the overlying Arcow Formation.

Auch Gleann Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUGL
has current status: CURRENT
has theme: BEDRCK
notation: AUGL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43558
has lithology component: AUGL PEL
has lithology component: AUGL PSAMM
has lithology component: AUGL SEMPEL
has source info: AUGL_52851
has obsolete equivalent: AUGL mn 1800
has obsolete equivalent: AUGL mn 2918
broader: Glen Spean Subgroup
has additional age information: Neoproterozoic (Cryogenian).
has lower boundary definition: Not seen.
has geographical distribution: Includes all of the Grampian Group psammite rocks which extend across the northern parts of 1:50k sheets 46W (Crianlarich) and 46E (Killin).
has lithology description: Interbedded pink quartzofeldspathic psammite and grey micaceous grey psammite. Parallel bedded psammite layers 10-20cm thick develop plane parallel internal lamination defined by alternations of more micaceous and quartzofeldspathic layers at a mm scale. Similar scale but undulose bedded forms also present with rare preservation of hummocky cross stratification. Subsidiary 50-100cm-thick massive beds may have a lenticular form and may be indicative of channel or sand-wave macroforms. Semipelite to pelite comprises a very minor part of the Formation but forms in layers up to 15m thick.
has thickness description: >1000m.
has upper boundary definition: Abrupt change to white weathering pinkish-brown quartzose psammite and quartzite of the succeeding Beinn a' Chaisteil Formation.

Auk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: RLG

Auchensoul Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AUL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43559
has lithology component: AUL SALMST
has lithology component: AUL SLST
has source info: AUL_48694
has source info: AUL_52655
broader: Barr Group
has lower boundary definition: Rests conformably on Kirkland Conglomerate.
has geographical distribution: Stinchar Valley area, Girvan. Laterally equivalent to Auchensoul Bridge Mudstone.
has lithology description: Impure sandy algal limestone.
has thickness description: 2.5m
has upper boundary definition: Conformably overlain and laterally transitional into Auchensoul Bridge Mudstone Formation (Ince, 1984).

Auchencar Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: AULA
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has source info: AULA_50545
has obsolete equivalent: AULA mn 168
broader: Auchencar Sandstone Formation
has lower boundary definition: The top of the Auchencar Burn Sandstone Member.
has geographical distribution: Isle of Arran.
has upper boundary definition: The base of the Creag Mhor Conglomerate Member, or sandstone within the Auchencar Sandstone Formation.

Auldearn (Park) Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: AULD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: AULD GN
broader: Cairngorm Granitic Suite

Auchlyne Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AULY
has current status: CURRENT
has theme: BEDRCK
notation: AULY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43560
has lithology component: AULY CALSIR
has lithology component: AULY CALSPL
has lithology component: AULY GHSCH
has lithology component: AULY PSAMI
has lithology component: AULY PSAMM
has lithology component: AULY SEMPEL
has lithology component: AULY SEMPG
has lithology component: AULY TALCR
has source info: AULY_52851
has obsolete equivalent: AULY mn 3952
broader: Easdale Subgroup
narrower: PUBL
has additional age information: Neoproterozoic (Ediacaran).
has lower boundary definition: Upper limit of the calcareous semipelite (typically pale green, phengite, chlorite schist) of the Ben Lawers Schist Formation.
has geographical distribution: Occurs at the stratigraphical boundary between the Ben Lawers Schist Formation and Ben Lui Schist Formation. Formation outcrops in the area west and northwest of Killin, in and around upper Glen Lyon and Glen Lochay.
has lithology description: Psammite, micaceous psammite and garnetiferous semipelite, with minor calcsilicate, calcareous garnetiferous semipelite and garnet-hornblende schist, the latter of possible volcaniclastic origin. Psammite dominates in the upper part of the formation, semipelite dominates in the lower part. Locally, muscovite-chlorite-talc schist with included fragments of carbonate, psammite and siliceous semipelite comprises a distinctive unit with a melange-like appearance within the Formation (Pubil Melange Member).
has thickness description: 0-400m?
has upper boundary definition: Transitional change upwards to schistose muscovite-biotite-garnet semipelite of the Ben Lui Schist Formation.

Auldshields Musselband (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: AUM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AUM FEST
has lateral equivalent: AUM st 59
broader: LCMS
has supplementary information: Might be split into the Auldshields Upper Blackband (Musselband) Ironstone and the Auldshields Lower Blackband Ironstone.

Auchnahyle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUNH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Aurora Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Auchencar Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43561
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43562
has lithology component: AUSA AND
has lithology component: AUSA CONG
has lithology component: AUSA SDST
has lithology component: AUSA SLST
has source info: AUSA_50545
has source info: AUSA_51673
has obsolete equivalent: AUSA mn 168
has obsolete equivalent: AUSA mn 4226
has obsolete equivalent: AUSA mn 166
has obsolete equivalent: AUSA mn 1120
broader: Arbuthnott-Garvock Group
narrower: Auchencar Burn Sandstones Member
narrower: Creag Mhor Conglomerate Member
narrower: Auchencar Lava Member
has lower boundary definition: The top of the Basal Quartz Sandstone Formation.
has geographical distribution: Machrie to Glen Rosa, Arran.
has lithology description: Red lithic sandstones, quartzite conglomerates and lava pebble conglomerates common towards the top of the succession, withnd one grey pyroxene andesite lava intercalation.
has thickness description: About 450 - 500 m thick.
has upper boundary definition: The sandstone of the Auchencar Sandstone Formation, and the top of the Creag Mhor Conglomerate Member are overlain by the base of the Machrie Burn and Allt an Brighide Siltstones of the Am Binnein Sandstone Formation.

Auchenheath Smithy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AUSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: AUSM COAL
broader: LSC

Arundel Sponge Beds
type: Concept
in scheme: NamedRockUnit
alternative label: AUSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Auldthorns Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AUT
has current status: CURRENT
has theme: BEDRCK
notation: AUT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OU
has predominant age: OU
has youngest age: OU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43563
has lithology component: AUT SDST
has source info: AUT_51772
broader: Drummuck Subgroup
narrower: East Brow Member
has lower boundary definition: Conformably overlies the Shalloch Formation.
has geographical distribution: Not defined.
has lithology description: Coarse-grained greenish sandstones.
has thickness description: 36m
has upper boundary definition: Conformably overlain by the Quarrel Hill Formation.

Auchenheath Wee Gas Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AUWG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: AUWG COAL
broader: LSC

Airdrie Virtuewell Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: AV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: AV COAL
has lateral equivalent: AV st 476
broader: LCMS

Avonmouth No.1 Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AV1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: AV1 COAL
broader: Farrington Member

Avonmouth No.2 Coal
type: Concept
in scheme: NamedRockUnit
alternative label: AV2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: AV2 COAL
broader: Farrington Member

Appletreeworth Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AVF
has current status: CURRENT
has theme: BEDRCK
notation: AVF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43564
has lithology component: AVF RYTUF
has source info: AVF_50725
has source info: AVF_51117
has obsolete equivalent: AVF mn 3557
broader: Dent Group
has lower boundary definition: Base of rhyolitic tuff, overlying limestone of the Broughton Moor Formation or, where absent, the Kirkley Bank Formation.
has geographical distribution: Windermere to Broughton Mills, Cumbria.
has lithology description: Rhyolitic tuff within a succession of calcareous siltstones and impure limestones.
has thickness description: 0 to 5m
has upper boundary definition: Defined by base of overlying calcareous siltstones/impure limestones.

Aran Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: AVG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43565
has lithology component: AVG BA
has lithology component: AVG RY
has lithology component: AVG SR
has lithology component: AVG VLSS
has source info: AVG_48777
has source info: AVG_50526
has source info: AVG_50686
has source info: AVG_51180
has source info: AVG_51270
has source info: AVG_51272
has source info: AVG_52047
has source info: AVG_52252
has source info: AVG_52909
has source info: AVG_52970
broader: NA
narrower: Aran Fawddwy Formation
narrower: Bifidus Slate Formation
narrower: Benglog Volcanic Formation
narrower: Craig-Y-Ffynnon Formation
narrower: Craig Cau Formation
narrower: MU
narrower: MUBR
narrower: Cregennen Formation
narrower: OF
narrower: PGA
narrower: PNF
narrower: Craig Y Llam Formation
narrower: LYG
narrower: RBVO
narrower: Brithion Formation
narrower: Beacon Hill Volcanic Formation
has lower boundary definition: Overlies the Mawddach and Rhobell Volcanic groups, with unconformity in places. The base is drawn at the base of the quartzose sandstones of the Garth Grit Member (Allt Llwyd Formation), where it rests unconformably upon bedded felsic rocks of the Rhobell Volcanic Group.
has geographical distribution: The surrounding area of Harlech known as the Harlech Dome, which includes most of the Snowdonia National Park.
has lithology description: A mixed suite of basalts, rhyolites volcaniclastic and sedimentary rocks.
has thickness description: Up to 2.5km in the Cadair Idris district.
has upper boundary definition: Drawn at the conformable upward passage of the Craig Cau Formation (Cadair Idris District) into turbiditic mudstones and siltstones o the Ceiswyn Formation. The top of the group is not seen in the Harlech district, where the highest formation represented is the Aran Fawddwy Formation, comprising felsic ash-flow tuffs.

Aveline's Hole Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AVHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
broader: Burrington Oolite Subgroup

Anvil Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AVL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: AVL LMST
has source info: AVL_51867
has lateral equivalent: AVL SHLS
has lateral equivalent: AVL KL1
broader: LLGS
has geographical distribution: Around East Kilbride, "Lanarkshire". Correlated with Second Hosie and First Kingshaw limestones elsewhere.

Avoniel Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: AVLI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: AVLI LMST
broader: NE

Avoch Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AVM
has current status: CURRENT
has theme: BEDRCK
notation: AvM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43566
has lithology component: AVM CONG
has lithology component: AVM SDST
broader: RDF
has lower boundary definition: Conformable lower contact on Kilmuir Conglomerate Formation.
has geographical distribution: Not defined.
has thickness description: 100m, lensing.
has upper boundary definition: Conformable upper contact with Drumderfit Conglomerate Member.

Avon Group
type: Concept
in scheme: NamedRockUnit
alternative label: AVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43567
has lithology component: AVO CLMST
has lithology component: AVO FEST
has lithology component: AVO LMST
has lithology component: AVO MDST
has source info: AVO_48818
has source info: AVO_49355
has source info: AVO_49376
has source info: AVO_51502
has source info: AVO_51803
has source info: AVO_52565
has obsolete equivalent: AVO st 173
has obsolete equivalent: AVO mn 2710
has obsolete equivalent: AVO mn 2614
has obsolete equivalent: AVO mn 2615
broader: Carboniferous Limestone Supergroup
narrower: Castell Coch Limestone Formation
narrower: Cwmyniscoy Mudstone Formation
narrower: Castell Coch Limestone [Duplicate Code: Use Ccl]
narrower: PLTB
narrower: SHB
narrower: TGW
has lower boundary definition: Conformable in southern settings, where it is taken at the sharp to gradational incoming of grey calcite mudstones, mudstones and limestones of the Group, above the red sandstones, siltstones and mudstones of the Upper Old Red Sandstone [Quartz Conglomerate Group, Tintern Sandstone Formation and Portishead Formation]. Boundary sharp in the Vale of Glamorgan and southeast crop of the South Wales Coalfield, where it is taken at the base of the Tongwynlais Formation. Elsewhere, boundary reported to be gradational at base of Shirehampton Formation or Avon Group undivided. Such boundaries are in urgent need of revision, especially that in South Pembrokeshire, where the uppermost part of the Skrinkle Sandstones is of similar facies to the Shirehampton Formation. In the Newport area of South Wales and the Bristol district the lower part of the Avon Group this has mistakenly been included in the Upper Old Red Sandstone formations on BGS maps. Disconformable along the north crop of the South Wales Coalfield, and Monmouth and Chepstow area where it is taken at the sharp erosive base of the transgressive skeletal and ooidal grainstones [Castell Coch Limestone Formation] of the group above the sandstones of the underlying Quartz Conglomerate Group, Tintern Sandstone Formation, Plateau Beds Formation, Grey Grits Formation and Brownstones Formation.
has geographical distribution: South Wales [SS 90 95], Monmouth and Chepstow [ST 53 94], Bristol [ST 60 74], the Mendip Hills [ST 50 53] and Clee Hill [Shropshire] [SO 60 74] areas. Passes southwards into the Pilton Shales Formation of North Somerset [ST 00 20].
has lithology description: Interbedded grey mudstones and thin- to medium-bedded skeletal packstones with one to several thick units of ooidal and skeletal grainstones. Thin units of calcite mudstone and mudstone locally present. Sparse thin ironstones. Represents mid to inner shelf/ramp deposits with coeval barrier, back barrier and coastal plain sediments.
has thickness description: 156m in the south Mendip Hills, thinning northwards to 96m in the Bristol area, 54m in the Monmouth area. 140m in the southern Vale of Glamorgan, thinning northwards to 10m on the northwest crop [Ammanford area] of the South Wales Coalfield.
has upper boundary definition: Gradational in southern settings, and taken at the incoming of stacked dark grey fine to coarse skeletal packstones with scattered mudstone partings [Barry Harbour Limestone Formation] of the Black Rock Limestone Subgroup above the interbedded mudstones and skeletal packstones [Cwmyniscoy Mudstone Formation] of the Avon Group. Boundary taken at the top of the last significant bed of grey mudstone. Along the eastern part of the north crop of the South Wales Coalfield, taken at the gradational incoming of the stacked dolomitised skeletal packstones [Sychnant Dolomite Formation] of the Clydach Valley Subgroup above the interbedded mudstones and skeletal packstones of the Avon Group. Along the remainder of the crop, the Group is overlain unconformably by the Dowlais Limestone Formation.

Assynt Vogesite Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: AVOG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Warwickshire Avon Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AVON
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43568
has lithology component: AVON C
has lithology component: AVON P
has lithology component: AVON S
has lithology component: AVON V
has lithology component: AVON Z
has source info: AVON_49128
has source info: AVON_49129
has source info: AVON_50269
has source info: AVON_50676
has source info: AVON_50812
has source info: AVON_50918
has source info: AVON_50978
has source info: AVON_51403
has source info: AVON_51616
has source info: AVON_52088
has source info: AVON_52614
has obsolete equivalent: AVON mn 185
broader: SACA
narrower: Ailstone Member (Warwickshire Avon)
narrower: Bretford Sand And Gravel Member And Wasperton Sand And Gravel Member (Undifferentiated) (Warwickshire Avon)
narrower: Frog Hall Member
narrower: STRSG
narrower: Cropthorne Sand And Gravel Member
narrower: PERT
narrower: WANIT
narrower: WAT
narrower: NIAT
narrower: NIT
narrower: Bretford Sand And Gravel Member
has additional age information: Mid Pleistocene to Holocene (MI Stages ?11 or 9 to 1).
has lower boundary definition: Unconformable, commonly channelled base on pre-Quaternary (mostly Triassic and Jurassic with some Carboniferous) bedrock, or on glacial deposits (till, sands and gravels) of the Wolston Formation, or pre-glacial fluvial sands and gravels of the Baginton Formation.
has geographical distribution: Avon Catchment (Warwickshire, Rugby to Tewkesbury area).
has lithology description: Fluvial terrace and alluvial deposits of the Warwickshire River Avon and all its tributaries; mainly sand, gravel, and mud; divided into six [or seven] "terrace" members (Frog Hall, Pershore, [Strensham], Cropthorne, New Inn, Wasperton and Bretford members), Holocene alluvium (Elmore Member of Bowen, 1999) and with local named organic deposits. Includes contemporaneous head, colluvium and soil deposits. Gravels are principally composed of "Bunter" quartz/quartzite, flint and Jurassic (mostly Lias) lithologies, derived from the Baginton Formation, Wolston Formation and the local bedrock of the catchment.
has supplementary information: (A) Renamed the Warwickshire Avon Valley Formation to avoid confusion with the Bristol Avon Valley Formation. Other possibilities might have been Warwick or Stratford or even Midland Avon, the last having been used in the titles of some papers. (B) It is impractical to give a fully comprehensive definition of the base in lithological terms.
has thickness description: 0 to c. 9m
has upper boundary definition: Ground surface.

Auchivarie Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AVPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: AVPS PSAMIF
has lithology component: AVPS PSAMM
has lithology component: AVPS QZITE
has lithology component: AVPS SEMPEL
broader: Corrieyairack Subgroup

Ashprington Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AVS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has lithology component: AVS BALAVA
has lithology component: AVS BATUF
has obsolete equivalent: AVS mn 149
broader: TBAY
narrower: Greenway Tuff Member

Ashow Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: AW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43569
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43570
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43572
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43573
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43574
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43571
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43575
has lithology component: AW MDST
has lithology component: AW SDST
has source info: AW_49363
has source info: AW_49953
has source info: AW_50777
has source info: AW_50812
has source info: AW_51419
has source info: AW_51872
has source info: AW_52392
has source info: AW_52583
has obsolete equivalent: AW mn 148
broader: WAWK
has lower boundary definition: Taken at the incoming of a thick succession of red mudstone (50 to 65m thick) above the Kenilworth Sandstone Formation.
has geographical distribution: Southern part of the Warwickshire Coalfield.
has lithology description: Red-brown mudstone with subordinate, but locally thick, beds of red-brown and grey-green, fine- to medium-grained sandstone.
has thickness description: Up to 250m in Sandy Lane and Barford boreholes.
has upper boundary definition: Taken at the base of the unconformable Bromsgrove Sandstone Formation (Triassic) in the type area.

Loch Awe Group
type: Concept
in scheme: NamedRockUnit
alternative label: AWE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43576
has lithology component: AWE CONG
has lithology component: AWE LAVA
has lithology component: AWE LMST
has lithology component: AWE QZITE
has lithology component: AWE SLTE
has source info: AWE_51875
has source info: AWE_52884
has obsolete equivalent: AWE mn 2448
broader: NE
has lower boundary definition: Drawn at base of quartzite conglomerate of the Loch Awe Group where it rests unconformably on the Ardrishaig Phyllites.
has geographical distribution: Strathclyde, Scotland.
has lithology description: Dark grey, black or blue limestones, highly pebbly quartzites, pebbly or non-pebbly, black-grey slates, conglomerate and pillow lavas associated with slate and limestone.
has thickness description: At least 90 metres.
has upper boundary definition: Drawn at unconformable upward change from schistose volcanic rocks of the Loch Awe Group to recent deposits.

Ardwell Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: AWL
has current status: CURRENT
has theme: BEDRCK
notation: AWL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43577
has lithology component: AWL CONG
has lithology component: AWL LMST
has lithology component: AWL MDST
has lithology component: AWL SDST
has lithology component: AWL SLST
has source info: AWL_48694
has source info: AWL_50759
has obsolete equivalent: AWL AMN
broader: Ardmillan Group
narrower: Craighead Limestone Formation
narrower: Balclatchie Formation
narrower: Ardwell Farm Formation
has lower boundary definition: Coincides with lower boundary of the Balclatchie Formation (on coastal outcrops) and lower boundary of the Craighead Limestone Formation (in the Craighead Inlier).
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Sandstone, siltstone, mudstone, limestone and conglomerate; highly fossiliferous in places (shelly faunas).
has thickness description: To c.1600m
has upper boundary definition: Coincides with upper boundary of the Ardwell Farm Formation.

Andrew Sandstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: AWSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: LIST

Auchenwinsey Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: AWTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43578
has lithology component: AWTI C
has lithology component: AWTI S
has lithology component: AWTI V
has source info: AWTI_49726
has source info: AWTI_50565
has source info: AWTI_50918
has lateral equivalent: AWTI st 58
has obsolete equivalent: AWTI mn 4318
broader: WITI
has lower boundary definition: Sharp, convex-up, undulose unconformity with underlying pinkish brown, very stiff, pebbly sandy silty shelly clay diamicton of the Eglinton Shell Till Member, or with dark grey stony diamicton of the Littlestone Till Formation, or bedrock.
has geographical distribution: West central Scotland.
has lithology description: Silty sandy stony clay diamicton ("lodgement till"), very stiff, dark grey, containing clasts of mainly local Westphalian lithogies (sandstone, mudstone, limestone and coal), with dolerite and local mafic igneous rocks. Forming drumlins.
has thickness description: To 12m
has upper boundary definition: Land surface or overlain by various younger Superficial units such as alluvium.

Mesoproterozoic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AXRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AX
has predominant age: AX
has youngest age: AX
broader: NA

Aylesbeare Mudstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: AYB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ayb
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43580
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43579
has lithology component: AYB MDST
has lithology component: AYB SDST
has lithology component: AYB SLMDST
has lithology component: AYB SLST
has source info: AYB_48711
has source info: AYB_51322
has source info: AYB_52078
has source info: AYB_52244
has source info: AYB_52971
has obsolete equivalent: AYB mn 188
has obsolete equivalent: AYB mn 1496
has obsolete equivalent: AYB mn 2625
has obsolete equivalent: AYB mn 189
broader: NRS
narrower: Exmouth Mudstone And Sandstone Formation
narrower: Clyst St Lawrence Formation
narrower: VBR
narrower: LMU
has lower boundary definition: Where undivided the Aylesbeare Mudstone rests on red-brown sandstone of the Dawlish Sandstone, possibly unconformably. See Clyst St Lawrence Formation and Exmouth Mudstone and Sandstone Formation for definition of base where those formations are present.
has geographical distribution: Extends from south Devon coast between Exmouth and Budleigh Salterton in a north-south trending belt to area west of the Quantocks (Sheet 295).
has lithology description: The undivided Aylesbeare Mudstone Group consists of reddish-brown silty mudstone and clayey siltstone; clayey fine-grained sandstone occurs locally, and less commonly, clean, fine- to medium-grained sandstone.
has thickness description: 530m on south coast (Selwood, et al, 1984); about 400m in Exeter district.
has upper boundary definition: Overlain sharply by the Budleigh Salterton Pebble Beds.

Allesley Sandstones And Conglomerates
type: Concept
in scheme: NamedRockUnit
alternative label: AYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has source info: AYC_49789
has lateral equivalent: AYC ASY
has obsolete equivalent: AYC mn 69
broader: Allesley Member

Astbury Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AYLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: AYLM LMST
broader: Astbury Formation

Astbury Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AYLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43581
has lithology component: AYLS COAL
has lithology component: AYLS LMST
has lithology component: AYLS MDST
has lithology component: AYLS SDST
has lithology component: AYLS SEATM
has lithology component: AYLS TUF
has source info: AYLS_49279
has source info: AYLS_50820
has source info: AYLS_51259
has source info: AYLS_52516
has obsolete equivalent: AYLS mn 160
broader: PKLM
narrower: Astbury Limestone Member
narrower: Astbury Sandstone Member
has lower boundary definition: The base of the formation is taken at the conformable base of the mudstone-rich succession with subordinate limestone above the limestone-dominated succession of the Bowsey Wood Formation.
has geographical distribution: The formation occurs above the northern part of the Market Drayton Horst. The formation is limited in outcrop to a small inlier, about 1km long and 300m wide, at Limekiln Farm, Astbury [SJ 86 59].
has lithology description: Comprises mudstones, interbedded with limestones, sandstones and tuffs and subordinate coals and seatearths. At the type locality the basal 43 m of the formation is dominated by grey or brown calcareous mudstone with several thin beds of impure grey or dark grey limestone and in the upper part thin beds of yellow-brown tuff and tuffaceous limestone and mudstone. Above this, a 52 m thick succession comprises brown mudstone and calcareous mudstone and includes at least three coals and a 21 m thick succession of white or pale yellow coarse-grained and feldspathic sandstones with thin interbeds of siltstone or mudstone, informally referred to as the Astbury Sandstone.
has thickness description: Up to 100 m thick.
has upper boundary definition: The top of the formation is taken at the top of the mudstone-dominated succession with subordinate limestones and sandstones, overlain conformably by the dark grey mudstone of the Bowland Shale Formation.

Ayre Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AYRE
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QI
has predominant age: QI
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43582
has lithology component: AYRE S
has lithology component: AYRE Z
has source info: AYRE_50596
has source info: AYRE_51128
broader: British Coastal Deposits Group
has additional age information: Possibly temperate OIS 5, 7 or 9 (between Saalian and Early Devensian).
has lower boundary definition: Overlies sand, gravel and diamicton of the Ayre Lighthouse Formation.
has geographical distribution: Northern part of the Isle of Man (50k sheets 36 and possibly 46).
has lithology description: Shelly silts and sands with a marine fauna (known only from boreholes).
has thickness description: 8m at its type section.
has upper boundary definition: Base of sand and gravel of the overlying Kiondroughad Formation.

Ayre Lighthouse Formation
type: Concept
in scheme: NamedRockUnit
alternative label: AYRL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QX
has predominant age: QX
has youngest age: QX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43583
has lithology component: AYRL DMTN
has lithology component: AYRL S
has lithology component: AYRL V
has source info: AYRL_50596
has source info: AYRL_51128
broader: ISCAG
has additional age information: Possibly cold OIS 8, 10 or 12 (between Anglian and Wolstonian).
has lower boundary definition: Unconformably overlies Permo-Triassic bedrock.
has geographical distribution: Northern part of the Isle of Man (50k sheets 36 and possibly 46)
has lithology description: Sand, gravel and diamicton of northern origin that rests on Permo-Triassic bedrock (known only from boreholes).
has thickness description: c.70m at its type section.
has upper boundary definition: Base of the shelly silts and sands of the overlying Ayre Formation.

Aylesbury Sand
type: Concept
in scheme: NamedRockUnit
alternative label: AYS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
broader: NE

Astbury Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: AYSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: AYSA SDST
broader: Astbury Formation

Aydon Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: AYSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: AYSH LMST
has lithology component: AYSH MDST
has lithology component: AYSH SDST
broader: SMGP

Neoproterozoic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: AZRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NA

Bottom First Waterloo Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: B1WC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: B1WC COAL
has lateral equivalent: B1WC 27YD
broader: PMCM

Bottom Second Waterloo Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: B2WC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: B2WC COAL
broader: PMCM

Bradford Threequarters Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: B3QC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: B3QC COAL
has obsolete equivalent: B3QC mn 567
has lateral equivalent: B3QC st 139
broader: PUCM

Bettws Four Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: B4FC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: B4FC COAL
broader: SWMCM

Burnley Four Foot Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: B4FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: B4FT COAL
has lateral equivalent: B4FT st 155
broader: PLCM

Barton Group
type: Concept
in scheme: NamedRockUnit
alternative label: BA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42120
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42119
has lithology component: BA CLAY
has lithology component: BA SANDU
has source info: BA_48788
has source info: BA_49354
has source info: BA_49933
has source info: BA_49934
has source info: BA_50819
has source info: BA_51020
has source info: BA_51410
has source info: BA_51620
has source info: BA_52147
has obsolete equivalent: BA mn 273
has obsolete equivalent: BA mn 2479
has obsolete equivalent: BA mn 275
broader: NE
narrower: Becton Bunny Member
narrower: Becton Sand Formation And Chama Sand Formation (Undifferentiated)
narrower: Becton Sand Formation
narrower: Barton Clay Formation
narrower: Barton Sand Formation
narrower: Boscombe Sand Formation
narrower: Chama Sand Formation
has lower boundary definition: Drawn at base of clay and flint pebbles of the Barton Clay where it rests conformably on grey-brown sand of the Selsey Sand.
has geographical distribution: Hampshire, England.
has lithology description: Yellow weathering, green-grey clay, with discrete fine-grained sand bands, yellow-pale grey weathering fine-grained sand, green-grey, sandy clay and clayey, silty fine-grained sand.
has thickness description: Approximately 175 metres.
has upper boundary definition: Drawn at conformable upward passage from black clays of the Belton Sand to pale green clays of the Headon Formation.

Barracks Ash
type: Concept
in scheme: NamedRockUnit
alternative label: BAA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BAA TUF
has source info: BAA_51867
broader: HON
has geographical distribution: The area around Barracks, Linlithgowshire.
has lithology description: Soft, fine-grained green feldspathic tuff, increasingly contaminated with epiclastic material northwards.

Beinn Airein-An Stac Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: BAAS FPBA
has lithology component: BAAS OLBA
broader: Eigg Lava Formation

Badbea Breccio-Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: BAB BREC
has lithology component: BAB CONG
has obsolete equivalent: BAB mn 195
broader: Berriedale Sandstone Formation

Barnstone Member And Barnby Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BABA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JH
has lithology component: BABA ARLMST
has lithology component: BABA CAMDST
has lithology component: BABA LMST
has lithology component: BABA MDST
broader: SMD
has lithology description: See the Lithology descriptions for the component members.

Barton Group, Bracklesham Group And Bagshot Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BABB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GY
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GB
has lithology component: BABB AROC
has lithology component: BABB CLAY
has lithology component: BABB GRAV
has lithology component: BABB LIGN
has lithology component: BABB SANDU
has lithology component: BABB SDST
has lithology component: BABB SILT
broader: NP
has lithology description: See the Lithology descriptions for the component units.

Basal Beds Formation (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: BABE
has current status: CURRENT
has theme: BEDRCK
notation: BB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42121
has lithology component: BABE CONG
has lithology component: BABE MDST
has lithology component: BABE SDST
has lithology component: BABE SLST
has source info: BABE_49423
has source info: BABE_52813
has source info: BABE_52954
has obsolete equivalent: BABE mn 304
has obsolete equivalent: BABE mn 306
broader: NP
has lower boundary definition: Unconformable base on Skiddaw Group or Eycott Volcanic Group rocks.
has geographical distribution: British Geological Sheets 22, 23.
has lithology description: Conglomerates with minor sandstones and mudstones.
has thickness description: Up to c.30m.
has upper boundary definition: Overlain conformably by Dinantian sediments (Orton Group or Chief Limestone Group); locally by Cockermouth Lavas.

Basement Breccia (Shetland)
type: Concept
in scheme: NamedRockUnit
alternative label: BABR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: NE

Basement Beds (Group)
type: Concept
in scheme: NamedRockUnit
alternative label: BABS
has current status: CURRENT
has theme: BEDRCK
notation: BB
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: BABS CONG
has source info: BABS_53034
broader: NE

Barton Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GB
has lithology component: BAC CLAY
has obsolete equivalent: BAC mn 274
broader: Barton Group
narrower: WNH

Barncroft Beck Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BACB
has current status: CURRENT
has theme: BEDRCK
notation: BacB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42122
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42123
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42124
has lithology component: BACB SDST
has lithology component: BACB SLST
has source info: BACB_48646
has source info: BACB_50588
has source info: BACB_52911
has obsolete equivalent: BACB mn 251
has obsolete equivalent: BACB mn 929
broader: Claughton Member
has lower boundary definition: Sharp between fossiliferous fissile clayey blue-grey mudstones with limestone nodules and thin sideritic lenses of Caton Shale below and siltstones with sandstones of the Barncroft Beck Beds above. Coincident with the base of the Claughton Member.
has geographical distribution: Lancaster Fells.
has lithology description: Variably interbedded sandy micaceous planty siltstones and fine-grained sandstones.
has thickness description: Approximately 85m
has upper boundary definition: Base of coarse-grained Nottage Crag Grit above siltstones and fine-grained sandstones of the Barncroft Beck Beds.

Badenloch Pelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BACH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BACH MIGM
has lithology component: BACH PELGN
has lithology component: BACH PSAMM
broader: LOCE

Ponfeith Back Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BACK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BACK COAL
broader: LSC

Basal Clastics Member
type: Concept
in scheme: NamedRockUnit
alternative label: BACL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
broader: RIPO
has geographical distribution: Recognised in the Republic of Ireland.

Barras Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BACO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BACO
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42125
has lithology component: BACO CONG
has lithology component: BACO SDST
has source info: BACO_50893
has source info: BACO_51273
has source info: BACO_51673
has source info: BACO_51981
has obsolete equivalent: BACO mn 259
has obsolete equivalent: BACO mn 2132
broader: Catterline Conglomerate Formation
has lower boundary definition: A conformable and diachronous passage down and laterally south into the St. John's Knap Sandstone Member, delineated at the point where conglomerate becomes predominant upwards from the underlying formation.
has geographical distribution: Between Law of Lumgair (NO 8525 8180) and Chapel of Barras (NO 8355 7812).
has lithology description: A bimodal, clast-supported conglomerate with clasts mainly of lava, with psammite, quartzite, vein-quartz and feldspar porphyry in a coarse-grained lithic sandstone matrix.
has thickness description: From 100 m to 255 m thick.
has upper boundary definition: Apparently conformable, probably diachronous, at the base of the lavas of the Montrose Volcanic Formation.

Bacton Group
type: Concept
in scheme: NamedRockUnit
alternative label: BACT
has current status: CURRENT
has theme: BEDRCK
notation: Bac
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42126
has lithology component: BACT MDST
has lithology component: BACT SDST
has source info: BACT_50904
has source info: BACT_52982
broader: NP
narrower: Bunter Sandstone Formation
narrower: Bunter Shale Formation
has lower boundary definition: Slightly unconformable, at an abrupt upward transition from the evaporites or dolomitic limestones of the upper part of the underlying Zechstein Group to the red or red-brown mudstones of the lower part of the Bacton Group.
has geographical distribution: Offshore UK, southern North Sea. Equivalent to the combined Roxby Formation and Sherwood Sandstone Group of onshore nomenclature, northeast England (Johnson et al., 1994).
has lithology description: Comprises a lower unit of red, red-brown and grey mudstones (Bunter Shale Formation), and an upper unit of red, orange and white dolomitic sandstones interbedded with red and grey mudstone (Bunter Sandstone Formation).
has thickness description: Up to 600m (Johnson et al., 1994).
has upper boundary definition: Slightly unconformable, at abrupt upward change from sandstone of the Bacton Group to red-brown dolomitic mudstone with evaporites of the overlying Haisborough Group.

Basement Beds (Of Dudley)
type: Concept
in scheme: NamedRockUnit
alternative label: BAD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Badanloch Granite Sheets
type: Concept
in scheme: NamedRockUnit
alternative label: BADG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: G
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: BADG GN
has obsolete equivalent: BADG mn 2450
has obsolete equivalent: BADG mn 3907
broader: HOMI
has lower boundary definition: The sheets are subconcordant within the Moine metasedimentary rocks.
has geographical distribution: Caithness and Sutherland, Scotland.
has lithology description: A locally highly foliated sodic, plagioclase granite with biotite schlieren.
has thickness description: Variable.
has upper boundary definition: The sheets are subconcordant within the Moine sedimentary rocks.

Bassenthwaite Diorite Intrusions
type: Concept
in scheme: NamedRockUnit
alternative label: BADIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42127
has lithology component: BADIN DI
has lithology component: BADIN DOLR
has lithology component: BADIN HBT
has lithology component: BADIN MCDI
has source info: BADIN_48986
has source info: BADIN_48987
has source info: BADIN_48988
has source info: BADIN_51591
has source info: BADIN_52826
broader: LDOMI
has lower boundary definition: Not defined.
has geographical distribution: In the outcrop area of the Skiddaw Group, mainly between Cockermouth and Keswick, Cumbria, and also in Black Combe, Cumbria.
has lithology description: A porphyritic, horneblende-diorite and microdiorite, dolerite and olivine-augite hornblendite. Radiometric age: 458 +/- 9 Ma (K-AR whole rock) (Rundle, 1979)
has thickness description: Plugs and sheet-like masses emplaced into the Skiddaw Group.
has upper boundary definition: Not defined.

Baddoch Burn Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BADL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BADL LMST
has obsolete equivalent: BADL mn 1746
broader: Birchwood Semipelite Formation

Baddoch Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BADQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Badsworth Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BADR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BDR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BADR SDST
broader: PUCM

Badsworth Member
type: Concept
in scheme: NamedRockUnit
alternative label: BADS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42129
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42128
has lithology component: BADS COAL
has lithology component: BADS MDST
has lithology component: BADS SDST
has lithology component: BADS SEATS
has lithology component: BADS SLST
has source info: BADS_51376
has obsolete equivalent: BADS mn 196
broader: PUCM
has lower boundary definition: Base of First Cherry Tree Marker (mudstones with bivalves).
has geographical distribution: Yorkshire Coalfield.
has lithology description: Mudstones, siltstones and sandstones. Grey beds with thin coals in lower part. Red beds above.
has thickness description: c.90m+
has upper boundary definition: Not defined. (Highest preserved bed of Coal Measures beneath the sub-Permian Unconformity).

Ballyloughan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: NE

Barmouth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BaGS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42130
has lithology component: BAG MDST
has lithology component: BAG SDST
has source info: BAG_49097
has source info: BAG_52252
has source info: BAG_52536
broader: Harlech Grits Group
has additional age information: St David?s?
has lower boundary definition: Conformable on siltstones and mudstones of the Hafotty Formation.
has geographical distribution: Harlech Dome.
has lithology description: Coarse grained turbiditic sandstone and subordinate mudstone.
has thickness description: 60-230m
has upper boundary definition: Sharply and conformable overlain by silty mudstone of the Gamlan Formation.

Ballagh Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAGH
has current status: CURRENT
has theme: BEDRCK
notation: BAGH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42131
has lithology component: BAGH LMST
has source info: BAGH_50015
broader: Dartry Limestone Formation
has lower boundary definition: Sharp contact with dark grey limestones and shales of the Dartry Limestone Formation.
has geographical distribution: Exposed over 4km strike length in south County Fermanagh.
has lithology description: Massive bedded, pale grey to fawn, coarse crinoidal grainstone.
has thickness description: 0 to 6m
has upper boundary definition: Sharp contact with dark grey limestones and shales of the Dartry Limestone Formation.

Barony Glen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAGL
has current status: CURRENT
has theme: BEDRCK
notation: BAGL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42132
has lithology component: BAGL CLCRET
has lithology component: BAGL MDST
has lithology component: BAGL PALSOL
has lithology component: BAGL SDST
has lithology component: BAGL SLST
has source info: BAGL_51705
has source info: BAGL_51814
broader: ROEV
narrower: Douglas Bridge Limestone Member
has additional age information: Courceyan (CM Biozone).
has lower boundary definition: Concealed, but succeeds the Spincha Burn Conglomerate Formation from which it is distinguished by the absence of conglomerates and coarse-grained sandstones and the presence of palaeosols and calcrete horizons.
has geographical distribution: East side of the Dalradian Supergroup outcrop in the Sperrin Mountains and fringing the south side of Loch Foyle. Located west of the western edge of the basalt lavas of the Antrim Plateau.
has lithology description: Interbedded sandstone, siltstone, mudstone, calcrete, palaeosols, purplish brown, purplish red, grey, fawn, brown, green.
has thickness description: 400m
has upper boundary definition: On 1:50 000 Sheet 18 the Barony Glen Formation is overlain unconformably by a succession of rocks including the Triassic Sherwood Sandstone and Mercia Mudstone groups, the Late Cretaceous Hibernian Greensand and Ulster White Limestone formations and the Palaeogene Lower Basalt Formation of the Antrim Lava Group.

Bayston-Oakswood Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAGP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42133
has lithology component: BAGP CSSST
has lithology component: BAGP MDST
has lithology component: BAGP SDST
has lithology component: BAGP SLST
has source info: BAGP_48649
has source info: BAGP_49336
has source info: BAGP_49905
has obsolete equivalent: BAGP mn 321
broader: YW
narrower: YWCH
narrower: YWOC
narrower: YWOD
narrower: YWOL
narrower: YWOS
has additional age information: Late Neoproterozoic.
has lower boundary definition: At the base of the Bayston - Oakswood Formation massive coarse purplish sandstone with small scattered pebbles rests unconformably upon purple and green shales and sandstones of the Portway Formation. The basal sanstone may reprent the dying out of the Haughmond Conglomerate, which forms the basal member of the Formation, overlying beds that might be equivalent to the Synalds Formation, in the Shrewsbury area.
has geographical distribution: Within the Church Stretton district: Long Mynd towards Shrewsbury.
has lithology description: Coarse-grained purple sandstones and grits with subordinate purple mudstones, siltstones and at least three beds of conglomerate.
has thickness description: Averages c.1800m.
has upper boundary definition: Drawn at the conformable upward passage of massive sandstones of the Bayston - Oakswood Formation to more flaggy siltstones and laminated sandstones of the Bridges Formation.

Balnagown Group
type: Concept
in scheme: NamedRockUnit
alternative label: BAGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42134
has lithology component: BAGR SDST
has source info: BAGR_48776
has source info: BAGR_51276
has source info: BAGR_52175
has source info: BAGR_52293
has source info: BAGR_52691
broader: NE
has lower boundary definition: Drawn at base of yellow and red sandstones of the Balnagown Group where it rests unconformably on sandstone of the Strath Rory Group.
has geographical distribution: Highlands, Scotland.
has lithology description: Yellow and red, medium-grained, cross bedded sandstone of fluvial origin with scattered pebbles.
has thickness description: Not known.
has upper boundary definition: Drawn at unconformable upward change from yellow and red sandstone of the Balnagown Group to probable Jurassic Strata.

Baron Hill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42135
has lithology component: BAH TFAMST
has lithology component: BAH TFASST
has lithology component: BAH TUF
has source info: BAH_49929
has source info: BAH_50193
has source info: BAH_50644
has source info: BAH_50698
has source info: BAH_51843
has obsolete equivalent: BAH mn 254
has obsolete equivalent: BAH mn 255
broader: Arfon Group
has additional age information: Early Cambrian.
has lower boundary definition: Unknown, however Greenly (1919) supposed that it overlay the Gwna Melange (now Gwna Group) of Anglesey, but there is some doubt about this, given the current uncertainties on the age of these divisions.
has geographical distribution: 1:50,000 Geological Sheet 106 (Bangor). The formation represents part of the Arfon Group of the mainland that extends onto Sheet 105 Caernarfon.
has lithology description: Tuffaceous mudstones interbedded with massive, coarse-grained tuffaceous sandstones and conglomerates, containing clasts of felsic welded tuff, basalt and basaltic hyaloclastite.
has thickness description: At least 300 m thick.
has upper boundary definition: Unknown; probably unconformably overlain by Ordovician strata along its southeastern crop.

Bail Hill Volcanic Group [Obsolete Code: Use Bail]
type: Concept
in scheme: NamedRockUnit
alternative label: BAHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: LHG

Bailey Hill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SD
broader: NA
narrower: Dingle Mudstone Member
narrower: Cwm-Yr-Hob Member
has geographical distribution: Presteigne - Knighton area, mid Wales.
has thickness description: 1066m

Bail Hill Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: BAIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BAIL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42136
has lithology component: BAIL FELS
has lithology component: BAIL LAVA
has lithology component: BAIL PYBRT
has lithology component: BAIL TRAND
has lithology component: BAIL TUF
has source info: BAIL_52489
broader: LHG
narrower: Cat Cleuch Formation
narrower: PERG
has lower boundary definition: Rests on black mudstone, possiblythe the Glenkiln Shale Formation of the Moffat Shale Group.
has geographical distribution: Bail Hill area, Sanquhar, south Scotland. Includes Peat Rig Formation and Cat Cleugh Formation.
has lithology description: Lavas, pyroclastic rocks, etc, thought to be remains of a seamount volcano.
has thickness description: c.1200m
has upper boundary definition: Faulted.

Bain Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAINV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42137
has lithology component: BAINV C
has lithology component: BAINV S
has lithology component: BAINV V
has lithology component: BAINV Z
has source info: BAINV_49710
has source info: BAINV_50286
has source info: BAINV_50918
has source info: BAINV_52253
broader: TRWCA
narrower: Castle Sand And Gravel Member
narrower: THSG
has additional age information: Middle Pleistocene (Anglian) to Holocene (MI Stages 12 or 10 to 1).
has lower boundary definition: Unconformable, commonly channelled base on Anglian glacial deposits or on pre-Quaternary bedrock.
has geographical distribution: Bain catchment, from headwaters near Doninton on Bain [TF 23 83] to confluence with River Witham near Tattershall [TF 21 59].
has lithology description: Fluvial terrace deposits of the River Bain. Mainly sand, gravel and mud; divided (in type area) into two principal "terrace" members (Thorpe and Castle) plus alluvium (Bain Member of Bowen, 1999), and an older (late Anglian) terrace (Martin/Tattershall Airfield of Bowen, 1999), plus local named organic deposits. Includes contemporaneous head, colluvium and soil deposits. Gravel dominated by flint and chalk pebbles, and other Jurassic/Cretaceous material derived mainly from glacial deposits of the Anglian Lowestoft Formation, plus an additional component of Upper Jurassic and Cretaceous material from the bedrock of the catchment.
has thickness description: 0 to c. 8m
has upper boundary definition: Ground surface.

Bathgate Jewel Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BAJ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BAJ COAL
broader: LSC

Banknock Shale Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BAKN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BAKN COAL
broader: LCMS

Banks Group
type: Concept
in scheme: NamedRockUnit
alternative label: BAKS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
broader: NE
narrower: NANN
narrower: STAT

Ballyshannon Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAL
has current status: CURRENT
has theme: BEDRCK
notation: BAL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42138
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42139
has lithology component: BAL CHRT
has lithology component: BAL LMST
has lithology component: BAL SDST
has lithology component: BAL SLMDST
has source info: BAL_51623
has source info: BAL_52064
has source info: BAL_52183
has obsolete equivalent: BAL GLRB
has obsolete equivalent: BAL mn 3303
broader: TYRO
narrower: Ederny Limestone Member
narrower: NEWT
narrower: Drumowen Sandstone Member
narrower: MGHM
narrower: Crockanaver Limestone Member
narrower: ROOM
narrower: Gortnaree Sandstone Member
has lower boundary definition: Lowest member of the formation, the Gortnaree Sandstone Member, conformably succeeds the Termon River Limestone Formation.
has geographical distribution: Northwest Carboniferous basin of Ireland.
has lithology description: Limestone, dark blue-grey, bioclastic, argillaceous packstones, interbedded with dark grey, silty shale; rarely with chert nodules in upper part; named members include sandstones.
has thickness description: 120 - 450 metres.
has upper boundary definition: Highest member of the formation, the Ederny Limestone Member, is overlain disconformably by the normal Bundoran Shale Formation or the sandstone basal member in the Kesh-Omagh area and southwest County Fermanagh.

Balbardie Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BALB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BALB FEST
broader: LSC

Ballyalicock Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Balchraggan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: BALCH MDST
has lithology component: BALCH SDST
has lithology component: BALCH SLST
broader: INS

Balls Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BALCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BALCO COAL
broader: SWLCM

Balder Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: MORA
narrower: ODSA

Balfreish Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: BALFH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BALFH MCGN
broader: Argyll And Northern Highlands Granitic Suite

Ballater Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BALG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: BALG GN
broader: Cairngorm Granitic Suite

Ballaugh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALGH
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42140
has lithogenesis: FLUV
has lithology component: BALGH V
has source info: BALGH_50596
has source info: BALGH_51128
broader: IMCA
has additional age information: Late Devensian (Lateglacial) to Holocene.
has lower boundary definition: Generally alluvial fan gravels of the Ballaugh Formation unconformably overlie mixed sequence of the Orrisdale Formation [qv] (though some fan gravels interdigitate with deposits of the Orrisdale Formation). In other exposures the fan gravels overlie Lateglacial organic sediments of the Glen Balleira Formation.
has geographical distribution: Northern part of the Isle of Man (50k sheets 36 and possibly 46).
has lithogenesis description: Alluvial fan deposits.
has lithology description: Gravel-dominated sequences forming mountain front alluvial fans, commonly cryoturbated.
has thickness description: Unrecorded but diagrams suggest >20m thick locally.
has upper boundary definition: Usually the ground surface.

Balleich Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: BALH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BAL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: DO
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42141
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42142
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42143
has lithology component: BALH BA
has lithology component: BALH OLBA
has source info: BALH_51673
has source info: BALH_52200
broader: Craig Of Monievreckie Conglomerate Formation
has lower boundary definition: A conformable contact with medium-grained sublithic sandstone of the Bofrishlie Burn Sandstone Member.
has geographical distribution: The north-west limb of Strathmore Syncline between Maol Ruadh and Balleich in Queen Elizabeth Forest Park.
has lithology description: A fine- to medium-grained, commonly vesicular and amygdaloidal olivine basalt.
has thickness description: Approximately 30 m thick.
has upper boundary definition: Not seen, but quartz and quartzite conglomerate of the parent Craig of Monievreckie Conglomerate Formation, in close proximity above.

Balintober Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BALI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: BALI MDISH
has lithology component: BALI UMR
broader: NEBAS

Ball Coal (Midlothian)
type: Concept
in scheme: NamedRockUnit
alternative label: BALL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BALL COAL
broader: LSC

Ballysteen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: BALN LMST
has lithology component: BALN MDST
broader: NE

Balmakeith Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: BALT
has current status: CURRENT
has theme: SPRFCL
notation: BK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42144
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42145
has lithology component: BALT DMTN
has source info: BALT_48667
broader: Finglack Till Formation
has lower boundary definition: Unconformable (commonly tectonised) contact on underlying pebbly sands of the Ardersier Silts Formation or unconformable on bedrock.
has geographical distribution: Outcrops in main late glacial cliff between Nairn and Kingsteps Quarry; farther eastwards on 1:50000 Sheet 84 E (Nairn).
has lithology description: Diamicton, firm, sandy and silty, moderate reddish-brown to "reddish-yellow" with abundant rounded clasts of red-brown Upper Devonian (Nairn Sandstone Formation) sandstone.
has thickness description: To 3.2m
has upper boundary definition: Unconformable contact with overlying sands and silts of the Ardersier Silts Formation.

Ballencleuch Law Granite
type: Concept
in scheme: NamedRockUnit
alternative label: BALW
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: BALW
has revision number: 0
has rock unit rank: SH
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42146
has lithology component: BALW GN
has source info: BALW_50101
has obsolete equivalent: BALW mn 11
broader: Galloway Granitic Suite
has lower boundary definition: Intrusive.
has geographical distribution: Thornhill area.
has lithology description: Granite sheet intruded into wackes of the Gala Group (Silurian).
has thickness description: Elongate sheet c.4.5km x 0.2km, orientated NE - SW.
has upper boundary definition: Intrusive.

Ballynahone Micrite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BALY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: NE

Ballymartin Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Bankhead Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BAMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Bassey Mine Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BAMC
has current status: CURRENT
has theme: BEDRCK
notation: Bs
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BAMC COAL
has lateral equivalent: BAMC st 84
has obsolete equivalent: BAMC mn 310
broader: PLCM

Barrowmouth Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has source info: BAMU_52697
broader: Cumbrian Coast Group

Blue Anchor Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BAn
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42147
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42148
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42149
has lithology component: BAN DOLO
has lithology component: BAN DSMDST
has lithology component: BAN GYPST
has lithology component: BAN MDST
has lithology component: BAN SLMDST
has lithology component: BAN SLST
has source info: BAN_48671
has source info: BAN_48817
has source info: BAN_49475
has source info: BAN_50812
has source info: BAN_50821
has source info: BAN_51674
has source info: BAN_51731
has source info: BAN_51798
has source info: BAN_51812
has source info: BAN_52296
has source info: BAN_52358
has source info: BAN_52370
has source info: BAN_52513
has source info: BAN_52670
has source info: BAN_52829
has source info: BAN_52982
has lateral equivalent: BAN TTHY
has obsolete equivalent: BAN mn 1846
has obsolete equivalent: BAN mn 1849
has obsolete equivalent: BAN mn 3225
has obsolete equivalent: BAN mn 4124
has obsolete equivalent: BAN mn 4125
has obsolete equivalent: BAN mn 3189
has obsolete equivalent: BAN mn 4058
broader: MMG
has additional age information: ?Norian to Rhaetian. The precise level of the Norian-Rhaetian boundary in the UK sequence is currently unknown. It could be in the upper Branscombe Formation or in the lower Blue Anchor Formation. The Arden Sandstone Formation is late Carnian, and the upper part of the Blue Anchor Formation is Rhaetian, but there are no dates at all for the whole of the Branscombe Formation or the lower part of the Blue Anchor Formation. The lowest beds of the Blue Anchor Formation in SW England are certainly older than those in the Midlands, where the base of the Blue Anchor Formation is unconformable.
has lower boundary definition: Placed at an abrupt or rapid upward change from the red-brown, silty mudstones of the Branscombe Mudstone Formation to the green or grey-green, dolomitic mudstones of the Blue Anchor Formation. In parts of southern England and Wales the transition occurs over a greater thickness of beds or above a unit of interbedded red and green strata (e.g. on the west Somerset and south Devon coasts). The boundary may be locally unconformable, as suggested in the Warwickshire area by Old et al. (1987). At outcrop, the boundary is marked by a change in soil colour from the reddish brown clayey soils of the underlying Branscombe Mudstone Formation to the grey clayey soils of the Blue Anchor Formation. Typically, this boundary lies near the base of a scarp slope, which is formed by the Blue Anchor Formation and capped by limestones of the Penarth Group and lowermost Lias Group.
has geographical distribution: The formation is the highest unit of the Mercia Mudstone Group in the British Isles. The outcrop extends northwards from the south Devon coast, through Somerset, Avon, Gloucestershire, Worcestershire, Warwickshire, Leicestershire, Nottinghamshire, Lincolnshire, Humberside and Yorkshire and into Cleveland. Other outcrops occur in Gwent and Glamorgan, South Wales, and in the Cheshire and Carlisle basins. Outcrops in south Devon and Cleveland are in spatial continuity with occurrences of equivalent units offshore in the English Channel and Southern North Sea basins respectively.
has lithology description: The formation typically comprises pale green-grey, dolomitic silty mudstones and siltstones with thin arenaceous lenses and a few thin, commonly discontinuous beds of hard, dolomitic, pale yellowish-grey, porcellanous mudstone and silltstone ("Tea Green Marl" of Etheridge, 1865). In southern England and Wales only, the "Tea Green Marl" is overlain by the "Grey Marls" (Richardson, 1906). This unit (equivalent to the upper part of the Rydon Member and the whole of the Williton Member of Mayall, 1981) comprises grey, black, green and, rarely, red-brown dolomitic mudstones with, in the higher beds, yellowish-grey dolostones; also present are laminated siltstone beds with mudcracks, scarce pseudomorphs after halite, and locally abundant gypsum; miospores occur throughout and bivalve fossils and bioturbation become increasingly common upwards.
has thickness description: Type section: 36.54m (Warrington and Whittaker, 1984); primary reference section: 31.18m (Warrington and Ivimey-Cook, 1995). Maximum recorded thickness: 67.20m, Winterborne Kingston Borehole (BGS Borehole reference number SY89NW/1), Dorset (Rhys et al., 1982), inferred from geophysical logs. Elsewhere the Formation typically ranges from 5 to 20m; it is generally thinner (7 to 10m) in the more northerly basins.
has upper boundary definition: Slightly unconformable or disconformable, marked by an abrupt upward transition from green or grey-green, dolomitic mudstones of the Blue Anchor Formation to black, fossiliferous shales of the Westbury Formation (Penarth Group). The unconformity surface is commonly slightly irregular and small clasts of Blue Anchor Formation lithologies may occur at the base of the Westbury Formation. The Blue Anchor Formation is both burrowed and bored to a depth of several centimetres below the boundary. In parts of southern England and Wales (e.g. on the west Somerset coast) the upper part of the formation (Williton Member of Mayall, 1981) includes lithologies similar to that of the overlying Westbury Formation, giving rise to an apparently gradational and interdigitating upper boundary. At outcrop, the boundary is marked by a change in soil type from the generally paler grey clay of the Blue Anchor Formation, to the darker grey clay of the overlying Westbury Formation of the Penarth Group. Typically, this boundary lies about half way up a scarp slope capped by limestones of the Penarth Group and lowermost Lias Group.

Banton [Main] Coal (Glasgow-Airdrie)
type: Concept
in scheme: NamedRockUnit
alternative label: BANC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BANC COAL
broader: LSC

Banjaard Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BANJ
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Bank Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: BANK
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: BANK GRAV
has lithology component: BANK SANDU
has lithology component: BANK SDSH
broader: MDU
has lithology description: Typically sand and gravel; bank or bank-like form. [Generic description].

Banham Member
type: Concept
in scheme: NamedRockUnit
alternative label: BANM
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42150
has lithology component: BANM CLAY
has lithology component: BANM DMTN
has lithology component: BANM GRAV
has lithology component: BANM SANDU
has lithology component: BANM SILT
has source info: BANM_51305
has source info: BANM_52076
has obsolete equivalent: BANM BRK
has obsolete equivalent: BANM mn 243
has obsolete equivalent: BANM mn 1720
broader: HPGL
has lower boundary definition: Resting unconformably on Upper Chalk
has geographical distribution: Mapped out in the Banham - Kenninghall - Quidenham area; for exact distribution see Diss Memoir, figure 9.
has lithology description: Suite of diamictons, sands and gravels, silts and clays characterized by abundant quartz-quartzite pebbles.
has thickness description: Max. 9m
has upper boundary definition: Overlain abruptly by deposits of glacigenic Lowestoft Formation.

Bannagher Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BANN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
broader: TYRO
has geographical distribution: Recognised in the Republic of Ireland.

Banwy Member
type: Concept
in scheme: NamedRockUnit
alternative label: BANW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NYG

Blue Anchor Formation And Penarth Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BAPN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TR
has lithology component: BAPN LMST
has lithology component: BAPN MDST
has lithology component: BAPN SDST
has lithology component: BAPN SLMDST
has lithology component: BAPN SLST
broader: NP

Barron's Pike Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BAPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: BAPS SDST
broader: Cambeck Member
has geographical distribution: Parts of the Bewcastle sheet area, Cumbria.

Ben Algan Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42153
has lithology component: BAQU PSAMM
has lithology component: BAQU QZITE
has obsolete equivalent: BAQU mn 387
broader: Cullen Quartzite Formation
has lower boundary definition: Base of quartzites (not seen, cut-out by fault system along valley of River Spey).
has geographical distribution: Between Rothes Fault and River Spey NE of Craigellachie and Old Red Sandstone unconformity at Cairnty, Mulben (Sheet 85E).
has lithology description: Quartzite and quartzose psammite, buff to grey, well-bedded with abundant micaceous interbeds. Locally recrystallised, hard and massive.
has thickness description: c. 1250m seen.
has upper boundary definition: Top of quartzites, overlain by flaggy and schistose semipelites of the Findlater Flag Formation.

Bardsley Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BAR SDST
broader: PMCM

Barra Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BARA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: BARA CLAY
has source info: BARA_49243
broader: NE
has lower boundary definition: Base lies on major erosion surface or associated Hebrides Formation overlain by Jura Formation or crops out.
has geographical distribution: Not defined.
has lithology description: Dark grey clay, very soft-very firm, silty and gritty with scattered pebbles.
has thickness description: 66 metres in Borehole 78/2. Reaches maximum of 130 metres in western part of the sea of the Hebrides.
has upper boundary definition: Not defined.

Barrington Member
type: Concept
in scheme: NamedRockUnit
alternative label: BARB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42154
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42155
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42156
has lithology component: BARB LMST
has source info: BARB_48661
has source info: BARB_49793
has source info: BARB_50671
has source info: BARB_52108
has source info: BARB_52264
has obsolete equivalent: BARB mn 270
has obsolete equivalent: BARB mn 4406
broader: Beacon Limestone Formation
has lower boundary definition: Upward change from ferruginously weathering calcarenite with dominant mudstone clasts, pebbles and belemnite fragments.
has geographical distribution: Barrington (at least) to Pennard Hill in the north [ST 615 375]
has lithology description: Poorly ooidal micrites and calcarenites with common ammonites.
has thickness description: 0-3m
has upper boundary definition: Upward change from limestone to clays (Down Cliff Clay) or, where absent, sands of the Bridport Sands.

Barnsley Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BARC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BARC COAL
has lateral equivalent: BARC st 835
broader: PMCM

Bare Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BARE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BARE COAL
broader: PMCM
has supplementary information: Locally becomes part of the Thick Coal.

Bargan Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BARG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BARG COAL
broader: PMCM

Bardahessiagh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BARH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Barnsley Rider Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BARI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BARI COAL
broader: PMCM

Barkley Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BARK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Barrasford Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BARL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BARL LMST
has source info: BARL_51867
broader: Alston Formation

Barncraig Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BARN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BARN COAL
broader: MCMS

Barn Rock Member
type: Concept
in scheme: NamedRockUnit
alternative label: BARO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42157
has lithology component: BARO SDST
has source info: BARO_49776
has source info: BARO_50496
broader: LC
has lower boundary definition: Incoming of glauconitic and concretionary sandstone at the top of the silty clay coarsening upward sequence attributed to Division B (of London Clay) by King (1981).
has geographical distribution: Eastern Hampshire Basin in the vicinity of Portsmouth and Bognor Regis.
has lithology description: Very fine-grained glauconitic sandstone.
has thickness description: 2-3m
has upper boundary definition: Erosive contact at the base of the silty clays of Division C (of London Clay), King (1981).

Barnesmore Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BARP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has source info: BARP_52886
broader: NE
has additional age information: Rb-Sr whole rock 397 +/- 7 Ma (O'Connor et al., 1987).
has geographical distribution: Recognised in the Republic of Ireland.

Barnesmore Pluton (Phase 2)
type: Concept
in scheme: NamedRockUnit
alternative label: BARP2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Barnesmore Pluton (Phase 3)
type: Concept
in scheme: NamedRockUnit
alternative label: BARP3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Barr Group
type: Concept
in scheme: NamedRockUnit
alternative label: BARR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BARR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42158
has lithology component: BARR CONG
has lithology component: BARR LMST
has lithology component: BARR MDST
has source info: BARR_48694
has source info: BARR_49820
has source info: BARR_49821
has source info: BARR_52760
has obsolete equivalent: BARR mn 258
broader: NP
narrower: SLF
narrower: SMU
narrower: SUM
narrower: KDC
narrower: Confinis Formation
narrower: Benan Conglomerate Formation
narrower: Auchensoul Bridge Mudstone Formation
narrower: Auchensoul Limestone Formation
has lower boundary definition: Drawn at the base of the Kirkland Conglomerate Formation where conglomerate with interbedded limestone rests unconformably upon igneous and metamorphic lithologies of the Ballantrae Complex.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Conglomerate, limestone and mudstone, shallow marine and fan delta deposits.
has thickness description: c.1000m
has upper boundary definition: Drawn at the conformable upward passage of the Benan Conglomerate Formation where boulder conglomerate with matrix supported clasts of basalt dolerite and gabbro pass into blue grey nodular mudstone siltstone and sandstone of the Balatchie Formation.

Barrow Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BART
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BarT
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42159
has lithology component: BART LPTUF
has source info: BART_49785
broader: WB
has lower boundary definition: Base of pyroclastic flow deposit, usually overlies volcaniclastic sandstone and locally sits directly on the Wrayslack Tuff Member in the Waberthwaite Formation.
has geographical distribution: Between Beckstone (SD 183 903) and Duddon Bridge (SD 197 881), near Broughton in Furness, Cumbria.
has lithology description: Dacitic lapilli-tuff, pink-weathered, foliated, with autobreccia at top.
has thickness description: 230-270m
has upper boundary definition: Top of pyroclastic flow deposit that characteristically has a rheomorphic autoclastic breccia; Duddon Bridge Tuff Member above.

Barrow Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: BARW
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: BARW GRAV
has lithology component: BARW SANDU
broader: NE

Barton Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
has lithology component: BAS SANDU
has obsolete equivalent: BAS mn 278
broader: Barton Group

Balmoral Sandstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: BASA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: LIST

Basal Andesite Sill-Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BASC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SC
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Glencoe Caldera-Volcano Complex

Bassingfield Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BASG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: BASG GRAV
has lithology component: BASG SANDU
has obsolete equivalent: BASG mn 311
broader: TRVA
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Ballyalton Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BASI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Bass Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BASS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BASS COAL
has lateral equivalent: BASS st 333
broader: PLCM

The Bastard Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BAT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42160
has lithology component: BAT SDST
has source info: BAT_51520
has source info: BAT_52905
has lateral equivalent: BAT st 32
broader: Arbuthnott-Garvock Group
has lower boundary definition: The top of the New Orleans Conglomerate Formation.
has geographical distribution: South of Campbeltown on the Kintyre Peninsula on Sheet 12, excluding Sanda and neighbouring islands.
has lithology description: A finely laminated, locally cross-bedded sandstone, more quartzose than the underlying formation.
has thickness description: At least 100 m thick.
has upper boundary definition: Not seen as dips into the sea, elsewhere on Kintyre it is unconformably overlain by the Stratheden Group.

Batchie Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BATC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BATC COAL
broader: LSC

Bathgate Group
type: Concept
in scheme: NamedRockUnit
alternative label: BATH
has current status: CURRENT
has theme: BEDRCK
notation: BATH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has lithology component: BATH BA
has lithology component: BATH LAVA
has lithology component: BATH SR
has lithology component: BATH TUF
has lithology component: BATH TUFT
has source info: BATH_52764
broader: NE
narrower: SALV
narrower: KNV
narrower: Bathgate Hills Volcanic Formation
has lower boundary definition: The base of the Group is taken in most areas at an upward transition from sedimentary rocks in the Strathclyde or Clackmannan groups.
has geographical distribution: Central Fife, west Lothian, Bathgate and Salsburgh areas. Component Formations: Bathgate Hills Volcanic Formation, Salsburgh Volcanic Formation, Kinghorn Volcanic Formation.
has lithology description: Olivine-rich microporphyritic basalts of Dalmeny and Hillhouse types, some macroporphyritic olivine-basalts of Craiglockhart and Dunsapie types; bedded tuffites, tuffaceous sedimentary rocks also present.
has thickness description: Very variable: maximum is over 450m
has upper boundary definition: The top of the Group is taken at the highest known lava in the Passage Formation (in the Central Coalfield).

Banchory Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BATI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42161
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42163
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42162
has lithogenesis: GLACI
has lithology component: BATI CLAY
has lithology component: BATI DMTN
has lithology component: BATI GRAV
has lithology component: BATI SANDU
has source info: BATI_50626
broader: East Grampian Glacigenic Subgroup
has lower boundary definition: Unconformable: on pre Late Devensian superficial deposits or bedrock.
has geographical distribution: The East Grampian Highlands.
has lithology description: Gravelly and sandy diamicton composed principally of decomposed Neoproterozoic metamorphic rocks and Caledonian igneous rocks.
has thickness description: Very variable, generally 2 to 5m, over 8m proved in some sections
has upper boundary definition: Conformably overlain by Glen Dye Silts Formation or Lochton Sand and Gravel Formation; otherwise unconformably overlain by Flandrian deposits, or at the ground surface.

Batty Mine Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BATM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BATM COAL
broader: NE

Balmoral Tuffite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BATU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: LIST

Batavier Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BATV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Bad Na H-Achlaise Ultramafic Rocks
type: Concept
in scheme: NamedRockUnit
alternative label: BAUM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Bristol Avon Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BAVON
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42164
has lithology component: BAVON C
has lithology component: BAVON P
has lithology component: BAVON S
has lithology component: BAVON V
has lithology component: BAVON Z
has source info: BAVON_52266
has source info: BAVON_52565
has lateral equivalent: BAVON st 88
has lateral equivalent: BAVON st 399
has lateral equivalent: BAVON st 755
broader: SACA
has additional age information: Early Pleistocene to Holocene.
has lower boundary definition: Rests conformably on Jurassic, Triassic and Carboniferous bedrock.
has geographical distribution: The entire catchment of the Bristol Avon river and its tributaries, from Malmesbury and Frome to the mouth of the river.
has lithology description: The formation encompasses the fluvial, lacustrine and organic deposits of the Bristol Avon river. It includes floodplain alluvium and deposits of three river terraces. The floodplain alluvium comprises soft clays, silts and fine sands, with bodies of peat, all overlying sands and gravels. The terrace deposits include gravels, sands, silts and clays; the gravel clasts are dominantly local Jurassic limestones, Triassic sandstones and Carboniferous limestone, but also include some glacially-derived erratics from northwest England and the Welsh Borders.
has thickness description: To c.10m
has upper boundary definition: Surface.

Balclatchie Formation, Ardwell Formation And Whitehouse Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BAW
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has lithology component: BAW CONG
has lithology component: BAW MDST
has lithology component: BAW PESST
has lithology component: BAW SDST
has lithology component: BAW SLST
broader: NA
has lithology description: See the Lithology descriptions for the component formations.

Black And White Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BAWC
has current status: CURRENT
has theme: BEDRCK
notation: Bk&W
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BAWC COAL
has lateral equivalent: BAWC st 108
has obsolete equivalent: BAWC mn 448
broader: PMCM

Bay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BAY
has current status: CURRENT
has theme: BEDRCK
notation: BAY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OX
has predominant age: OX
has youngest age: OX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42165
has lithology component: BAY MDST
has lithology component: BAY SDST
has source info: BAY_50759
has source info: BAY_52717
has lateral equivalent: BAY st 171
has lateral equivalent: BAY st 44
has obsolete equivalent: BAY mn 4624
broader: Ardwell Farm Formation
has additional age information: Late Ordovician [Late Caradoc] Streffordian Stage, clingani Zone, morrisi Subzone (see Fortey and others, 2000, column 77).
has lower boundary definition: Distinguished from the rest of the Ardwell Farm Formation below, by the incoming of dark grey graptolite-bearing shale.
has geographical distribution: The Girvan area of southwest Scotland.
has lithology description: Sandstone and dark grey graptolitic shale.
has supplementary information: The Bay Member of the Ardwell Farm Formation in the Girvan foreshore area is a direct correlative of the Cascade Member of the same formation in the Penwhapple Burn area.
has thickness description: At least 45m
has upper boundary definition: Overlain by the South Shore Formation of the Whitehouse Subgroup.

Bay Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BAYC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Ba
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BAYC COAL
broader: NE

Bays Leap Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BAYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BAYL COAL
broader: PLCM

Brown Bank Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42166
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42167
has lithology component: BBA FELSFO
has lithology component: BBA LPTUF
has lithology component: BBA TUF
has lithology component: BBA VCSST
has source info: BBA_52468
has obsolete equivalent: BBA mn 638
broader: Borrowdale Volcanic Group
has lower boundary definition: At the change from coarse, eutaxitic, fiamme-rich lapilli tuff at the top of the Bleawath Formation to generally lithic-rich sequence above. Various members of the Formation overlap on to the top of the Bleawath Formation.
has geographical distribution: Seen in Sellafield boreholes 2 (NY00/28), 4 (NY00SE/29), 5 (NY00SE/30), 10A (NY00SW/38), RCF1 (NY00SE/35), RCF3 (NY00SE/37), RCM1 (NY00SE/41) and RCM2 (NY00SE/40).
has lithology description: Sheets of massive, unbedded, poorly sorted, generally lithic-rich welded lapilli-tuff of andesitic and rhyolitic composition; interbedded volcaniclastic sandstone, siltstone, pumice lapilli-tuff and accretionary lapilli-tuff. Contains the rhyolitic welded lapilli-tuff (Seascale Hall Member) and, in BH RCF1, a rhyolitic lava flow or lava-like tuff.
has thickness description: 255.55m in Type Section (355.5m in core because of andesite sill); 188m in Sellafield BH No.2; 127m in Sellafield BH No. 4; 45m in Sellafield BH No.5.
has upper boundary definition: At the upward change from the generally lithic-rich sequence to homogeneous andesitic welded tuff of the Fleming Hall Formation.

Blackband Coal (New Cumnock)
type: Concept
in scheme: NamedRockUnit
alternative label: BBAC
has current status: CURRENT
has theme: BEDRCK
notation: BB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BBAC COAL
broader: MCMS

Blaeberry Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BBB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42168
has lithology component: BBB CAMDST
has lithology component: BBB MDST
has lithology component: BBB SLMDST
has source info: BBB_48677
has source info: BBB_52494
broader: PRH
has lower boundary definition: Transition from grey mudstones and silty mudstones of Kip Burn Formation.
has geographical distribution: Muirkirk to Strathaven, Strathclyde region, Central Scotland.
has lithology description: Dark greenish grey mudstone and silty mudstone, rusty weathering.
has thickness description: 130m.
has upper boundary definition: Transition to greenish grey sandstones and mudstones of Dunside Formation.

Bagshot Formation, Bracklesham Group, Barton Group, Becton Sand Formation And Chama Sand Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BBBBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: BBBBC CLAY
has lithology component: BBBBC GRAV
has lithology component: BBBBC LIGN
has lithology component: BBBBC SANDU
has lithology component: BBBBC SDST
has lithology component: BBBBC SILT
broader: NE

Better Bed Band Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BBBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBBC COAL
broader: PLCM
has geographical distribution: West Yorkshire area.
has lithology description: The Better Bed Band Coal is a thin, poor quality, but widespread coal not normally of economic value

Burnfoot Bridge Coal (New Cumnock)
type: Concept
in scheme: NamedRockUnit
alternative label: BBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BBC COAL
broader: UCMS

Brathay Formation, Birk Riggs Formation And Coldwell Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BBCW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SH
has lithology component: BBCW AROC
has lithology component: BBCW CALSST
has lithology component: BBCW MDHLM
has lithology component: BBCW MDST
has lithology component: BBCW SDST
has lithology component: BBCW SLST
broader: WIN
has lithology description: See the Lithology descriptions for the component formations.

Black Band Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BBDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BBDC COAL
broader: PUCM

Brewin's Bridge Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: BBDY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: NA

B-Bed Evaporite
type: Concept
in scheme: NamedRockUnit
alternative label: BBE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: BBE GYPST
has obsolete equivalent: BBE mn 3292
broader: Eden Shales Formation

Black Bed Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BBEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BBEC COAL
broader: PMCM

Bottom Bensham Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BBEN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BBEN COAL
has lateral equivalent: BBEN st 395
has lateral equivalent: BBEN st 492
broader: PMCM

Bitter Beck Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BBF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BBF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42169
has lithology component: BBF MDST
has lithology component: BBF SDST
has lithology component: BBF SLST
has source info: BBF_50836
broader: SKG
has lower boundary definition: Not seen, thrust faulted over Kirkstile Formation.
has geographical distribution: Not defined.
has lithology description: Siltstone and mudstone with subordinate sandstone beds.
has thickness description: c.250m at Bitter Beck, up to 600m (very poorly exposed) south of Cockermouth (northwest corner of Map NY12).
has upper boundary definition: Rapid interbedded transition to Watch Hill Formation. (NY 149 316).

Better Bed Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: BBFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBFC SEATM
broader: PLCM

Breaky Bottom Flint
type: Concept
in scheme: NamedRockUnit
alternative label: BBFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Black Band Ironstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BBG
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42170
has lithology component: BBG COAL
has lithology component: BBG FEST
has lithology component: BBG LMST
has lithology component: BBG MDST
has lithology component: BBG SDST
has lithology component: BBG SEATM
has lithology component: BBG SLST
has source info: BBG_50705
has source info: BBG_51259
has source info: BBG_52516
has obsolete equivalent: BBG mn 472
has obsolete equivalent: BBG mn 449
broader: PUCM
has lower boundary definition: Base of the Bassey Mine Coal.
has geographical distribution: North Staffordshire Coalfield, but not shown on map.
has lithology description: Grey mudstone, siltstone and sandstone with 6 named coals, thick seatearths and 4 blackband ironstones. Ironstones pass laterally into limestone or calcareous mudstone to the south. Reddened mudstones increase in number and thickness to the south and west.
has thickness description: Up to 135 m in the Wolstanton Colliery No. 3 Shaft, SJ84NE/29 (SJ 8606 SJ 4800).
has upper boundary definition: Passage by alternation from grey strata of the Black Band Ironstone Member to red strata of the Etruria Formation. Top of member taken at top of uppermost grey measures in succession.

Boulby Halite
type: Concept
in scheme: NamedRockUnit
alternative label: BBH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Batchie (Blackband) Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BBI FEST
broader: LSC

Brocka Bank Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BBK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CH
has predominant age: CH
has youngest age: CH
has lithology component: BBK SDST
broader: SAML
has geographical distribution: West Yorkshire area [Brocka Bank, near Ilkley].
has lithology description: Thickly bedded, coarse-grained sandstone.
has thickness description: To c.25m

Blind Beck Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BBKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BBKS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42171
has lithology component: BBKS SDST
has lithology component: BBKS SLST
has source info: BBKS_50729
has source info: BBKS_51857
has source info: BBKS_52784
has obsolete equivalent: BBKS mn 3219
has obsolete equivalent: BBKS mn 3512
has obsolete equivalent: BBKS mn 3828
has obsolete equivalent: BBKS mn 3831
has obsolete equivalent: BBKS mn 493
broader: SHWC
has lower boundary definition: Conformable upon the top of the Shap Wells Conglomerate Formation.
has geographical distribution: The valley of the Birk Beck and Upper Lunedale, Cumbria.
has lithology description: A brick-red, trough cross-bedded, medium- to coarse-grained sandstone, with siltstone interbeds containing large abundant well-rounded sand grains with haematite pellicles interpreted to be of aeolian provenance.
has thickness description: Up to 200 m thick.
has upper boundary definition: Marked by the unconformity at the base of the Dinantian Marsett Formation.

Blackband Lingula Band
type: Concept
in scheme: NamedRockUnit
alternative label: BBLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Baddoch Burn Limestone Member [Redundant Code: Use Badl]
type: Concept
in scheme: NamedRockUnit
alternative label: BBLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Birchwood Semipelite Formation

Balblair Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BBLR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: SSCGR

Blackbyre Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BBLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42172
has lithology component: BBLS LMST
has source info: BBLS_49578
has source info: BBLS_50527
has obsolete equivalent: BBLS mn 2965
has obsolete equivalent: BBLS mn 3063
has obsolete equivalent: BBLS mn 4017
has obsolete equivalent: BBLS mn 1293
broader: LWM
has lower boundary definition: Usually seen as a change from an apparently marine mudstone, known as the Balgrochan Beds, in the Lawmuir Formation.
has geographical distribution: The Paisley and Glasgow area.
has lithology description: A pale to dark grey, crinoidal, bioclastic, argillaceous limestone interpreted to be of marine origin generally with a massive lower portion and a thinly bedded upper part, and is a name applied to limestone beds within the Balgrochan Beds., which are mostly mudstones.
has thickness description: Generally up to 0.35m thick, and possibly up to 7.0m in the Paisley and Glasgow districts. Elsewhere, the unit is represented by the Balgrochan Beds.
has upper boundary definition: Mostly identified by a change to probable marine mudstone of the Balgrochan Beds in the Lawmuir Formation overlain by non-marine strata locally including the freshwater Baldernock Limestone.

Bothwell Bridge Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BBMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BBMB SHMDST
has lateral equivalent: BBMB SFMB
broader: UCMS

Benburb Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BBMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bottom Beaumont Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BBMN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBMN COAL
broader: PLCM

Bebside Bank Seam (D/De1)
type: Concept
in scheme: NamedRockUnit
alternative label: BBNK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: PMCM

Basement Beds (Northern Pennines)
type: Concept
in scheme: NamedRockUnit
alternative label: BBNP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BBNP CONG
has lithology component: BBNP MDST
has lithology component: BBNP SDST
has lithology component: BBNP SLST
broader: NE

Basement Beds (North West)
type: Concept
in scheme: NamedRockUnit
alternative label: BBNW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BBNW CONG
broader: NE

Brooksbottoms Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BBOC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BBOC COAL
broader: MG

Beinn Buidhe Older Quartz-Gabbro Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BBOQG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BBOQG QGB
broader: Ardnamurchan Centre 2

Burn Of Benholm Peat Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BBP
has current status: CURRENT
has theme: SPRFCL
notation: BP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42173
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42174
has lithology component: BBP CLAY
has lithology component: BBP PEAT
has lithology component: BBP SILT
has source info: BBP_50227
has source info: BBP_50626
has source info: BBP_51777
has source info: BBP_52387
has source info: BBP_52712
has obsolete equivalent: BBP mn 693
has obsolete equivalent: BBP mn 694
broader: MDR
has lower boundary definition: Tectonic contact with grey shelly clay of Benholm Clay Formation.
has geographical distribution: NO 7943 6914 to NO 7943 6915. Burn of Benholm site.
has lithology description: Silty peat and organic silt, as lenses and rafts preserved between red-brown till and grey shelly clay.
has thickness description: 0.15m
has upper boundary definition: Tectonic contact with Mill of Forest Till Formation.

Baddoch Burn Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BBPE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BBPE PEL
has lithology component: BBPE PSAMM
has lithology component: BBPE SEMPEL
broader: Lochaber Subgroup

Beinn Bhreac Psammite
type: Concept
in scheme: NamedRockUnit
alternative label: BBPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42175
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42176
has lithology component: BBPS PSAMI
has lithology component: BBPS PSAMM
has lithology component: BBPS QZITE
broader: Dava Succession
has lower boundary definition: Poorly exposed conformable contact with Creag Bhuidhe Semipelite and way-up criteria.
has geographical distribution: Central Highlands, SE of Loch Ness, Strathnairn to Strathdean, Slochd area.
has lithology description: Gneissose interbanded psammite, micaceous psammite and siliceous psammite. Locally migmatitic.
has upper boundary definition: Transitional, locally tectonised contact. Structurally up into Flichity Semipelite - no way-up criteria.

Blanket Bog Peat
type: Concept
in scheme: NamedRockUnit
alternative label: BBPT
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: PEAT

Bouley Rhyolite Formation [Redundant Code: Use Brh]
type: Concept
in scheme: NamedRockUnit
alternative label: BBR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: JYVO

Banbury Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BBRC
has current status: CURRENT
has theme: BEDRCK
notation: B
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBRC COAL
broader: PLCM

Bottom Brockwell Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BBRO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBRO COAL
broader: PLCM

Brooksbottoms Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BBS SDST
has lateral equivalent: BBS st 148
broader: MG

Bofrishlie Burn Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BBSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BBS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42177
has lithology component: BBSA CONG
has lithology component: BBSA PESST
has lithology component: BBSA SDST
has source info: BBSA_51673
has source info: BBSA_52200
has obsolete equivalent: BBSA mn 514
broader: Craig Of Monievreckie Conglomerate Formation
has lower boundary definition: A faulted contact with Highland Border Complex rocks.
has geographical distribution: The north-west limb of the Strathmore Syncline, adjacent to the Highland Boundary Fault, between Balleich and Drum of Clashmore.
has lithology description: A reddish grey to reddish brown, fine- to coarse-grained, commonly poorly sorted, locally massive, locally micaceous, sub-lithic sandstone, with igneous clasts.
has thickness description: Inferred to be 200 m thick in the Aberfoyle area.
has upper boundary definition: A sharp contact with the overlying Balleich Lava Member of Craig of Monievreckie Conglomerate Formation.

Beck Bottom Stone Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BBSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BBSC COAL
broader: PMCM

Benbulben Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BBSF
has current status: CURRENT
has theme: BEDRCK
notation: BBSF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42178
has lithology component: BBSF CAMDST
has lithology component: BBSF LMST
has lithology component: BBSF SDST
has source info: BBSF_52183
has source info: BBSF_52776
has obsolete equivalent: BBSF mn 760
broader: TYRO
has lower boundary definition: Conformable with underlying siltstone/sandstone dominated sequence of the Drumchorick Siltstone Formation and Mullaghmore Sandstone Formation (only in type area).
has geographical distribution: Northwest Carboniferous basin of Ireland.
has lithology description: Mudstone, medium to dark grey, micaceous, calcareous, bioclastic, with thin to thick blue-grey, argillaceous, very fossiliferous limestones, thin calciturbidites and sandstones.
has thickness description: c.60 - 120 metres.
has upper boundary definition: Conformable, rapid transition with succeeding limestone dominated sequence of the Glencar Limestone Formation, in the type area.

Bark Butts Silts Member
type: Concept
in scheme: NamedRockUnit
alternative label: BBSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42179
has lithology component: BBSI C
has lithology component: BBSI S
has lithology component: BBSI Z
has source info: BBSI_49633
has source info: BBSI_49654
has source info: BBSI_50151
has source info: BBSI_51754
broader: Blengdale Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: At its type site, the Bark Butts Silts Member rests with an erosional contact on matrix-rich poorly sorted gravel of Lake District provenance (probably a cobbly upper facies of the Scale Beck Till Member).
has geographical distribution: West Cumbria, typically within Blengdale.
has lithology description: Interbedded clayey silt, sandy silt and silty sand with thin horizontal lamination and upward-fining varved interlamination towards its base.
has thickness description: 1.9m
has upper boundary definition: At its type site the Bark Butts Silts Member is overlain by the erosional base of the Whin Grit Gravel Member.

Babbacombe Slates
type: Concept
in scheme: NamedRockUnit
alternative label: BBSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
broader: NE

Brook-Bottom Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: BBT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bottom Brass Thill Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BBTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BBTC COAL
broader: PMCM

Bottom Busty Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BBU
has current status: CURRENT
has theme: BEDRCK
notation: BBu
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBU COAL
has lateral equivalent: BBU st 680
has lateral equivalent: BBU st 914
broader: PLCM

Basement Beds (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BBW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE

Brathay Formation, Birk Riggs Formation And Wray Castle Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BBWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has lithology component: BBWC AROC
has lithology component: BBWC MDHLM
has lithology component: BBWC MDST
has lithology component: BBWC SDST
has lithology component: BBWC SLST
broader: TNTH
has lithology description: See the Lithology descriptions for the component formations.

Bloody Bay Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BBY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/J
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has lithology component: BBY SDST
broader: NA
has additional age information: The units age, stratigraphical position and status are currently uncertain.
has lithology description: Massive cross-bedded sandstone.

Beltiboy Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: BBYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BBYC COAL
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Basement Conglomerate (North West)
type: Concept
in scheme: NamedRockUnit
alternative label: BC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: BC CONG
broader: NE

Banffshire Coast And Caithness (Albion) Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BCAG
has current status: CURRENT
has theme: SPRFCL
notation: BCA
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42180
has lithology component: BCAG CLAY
has lithology component: BCAG DMTN
has lithology component: BCAG GRAV
has lithology component: BCAG SANDU
has lithology component: BCAG SILT
has source info: BCAG_50626
has source info: BCAG_51617
has obsolete equivalent: BCAG mn 241
broader: Albion Glacigenic Group
narrower: Camp Fauld Till Formation
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: The hinterland of the Moray Firth, including the northeastern end of the Great Glen, the southern shores of the Moray Firth as far east as Buckie, the Black Isle, the land surrounding the Cromarty and Dornoch firths, Caithness and Orkney.
has lithology description: Suite of glacial, glaciofluvial, glaciolacustrine and glaciomarine deposits that include reddish to dark blue-grey clayey diamictons containing clasts and rafts of Mesozoic rocks derived from the bed of the Moray Firth; also pre-Late Devensian glaciomarine shelly muds.
has thickness description: To 10m
has upper boundary definition: Ground surface or unconformable contact with units of the Banffshire Coast and Caithness Glacigenic Subgroup.

Barr Church Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Britannia Catchments Group
type: Concept
in scheme: NamedRockUnit
alternative label: BCAT
has current status: CURRENT
has theme: SPRFCL
notation: CAT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42181
has lithology component: BCAT CLAY
has lithology component: BCAT DMTN
has lithology component: BCAT GRAV
has lithology component: BCAT PEAT
has lithology component: BCAT SANDU
has lithology component: BCAT SILT
has source info: BCAT_49636
has source info: BCAT_50918
has source info: BCAT_51617
has source info: BCAT_52633
broader: Great Britain Superficial Deposits Supergroup
narrower: SACA
narrower: Cornubian Catchments Subgroup
narrower: NCAT
narrower: NHC
narrower: Forth Catchments Subgroup
narrower: Forth Valley Formation
narrower: IMCA
narrower: SKCAT
narrower: SNTCA
narrower: SOCA
narrower: SOSI
narrower: SUCA
narrower: SXCAT
narrower: SYDR
narrower: ONCA
narrower: WMCS
narrower: WWACA
narrower: YCAT
narrower: YKC
narrower: Clyde Catchments Subgroup
narrower: Cheshire - North Wales Catchments Subgroup
narrower: STAY
narrower: Grampian Catchments Subgroup
narrower: TAYCA
narrower: TBPS
narrower: THCAT
narrower: Chelford Sand Formation
narrower: Cumbria-Lancashire Catchments Subgroup
narrower: Four Ashes Sand And Gravel Formation
narrower: Flanders Moss Peat Formation
narrower: TRWCA
narrower: TSLSI
narrower: TWEED
has lower boundary definition: Unconformable contact with units of the Albion Glacigenic Group, the Caledonia Glacigenic Group, the Dunwich Group, the Crag Group or bedrock.
has geographical distribution: The British Isles excluding Ireland.
has lithology description: A suite of fluvial, lacustrine, mass movement, periglacial and aeolian deposits that contain clasts derived from rocks cropping out throughout Great Britain and the Isle of Man, including alluvium, river terrace deposits, peat, head, cover sand and blown sand. Subdivided into subgroups defined geographically by drainage systems.
has thickness description: To 100m
has upper boundary definition: Generally the ground surface, but locally units of this group interfinger with units of the British Coastal Deposits Group.

Black Cock Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has source info: BCB_50080
has obsolete equivalent: BCB mn 450
broader: NA
narrower: Grammysia Member
narrower: LYB

Bottom Coal (Birmingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BCBM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BCBM COAL
broader: PLCM

Bryn-Crin Basaltic Trachyandesite
type: Concept
in scheme: NamedRockUnit
alternative label: BCBT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ON
has lithology component: BCBT TRAND
has source info: BCBT_50909
broader: NA
has lower boundary definition: Not applicable.
has lithology description: Amygdaloidal basaltic trachyandesite, characterised by abundant andesine phenocrysts, glomeroporphritic clots, augite and apatite in microcrystalline groundmass.
has thickness description: To 100m
has upper boundary definition: Not applicable.

Bein Nan Coireag Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: BCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Blackstone Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: BCCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BCCC COAL
broader: PMCM

Ballycastle Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KM
has predominant age: KM
has youngest age: KM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42182
has lithology component: BCCK CHLK
has lithology component: BCCK FLNT
has source info: BCCK_51373
has source info: BCCK_52106
has source info: BCCK_52212
has obsolete equivalent: BCCK mn 227
has obsolete equivalent: BCCK mn 229
broader: UWLF
has additional age information: Maastrichtian. Belemnella occidentalis Zone.
has lower boundary definition: Conformable on the Port Calliagh Chalk Formation at a prominent weathered-out bedding plane at the top of `Bed? F of that lower formation and characterised by tabulate flints.
has geographical distribution: Limited to the Ballymagarry and Ballycastle areas by pre-Palaeogene erosion
has lithology description: Limestone (chalk) with nodular flint bands which have a carious habit in the upper part of the formation. Divided into seven `Beds? (A to G).
has thickness description: 13.72m at type-site.
has upper boundary definition: Erosional contact with Palaeogene Basalts or Quaternary deposit.

Black Cliff Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BCCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has lithology component: BCCO COAL
has lateral equivalent: BCCO st 109
has obsolete equivalent: BCCO st 109
broader: PES

Banffshire Coast And Caithness Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BCD
has current status: CURRENT
has theme: SPRFCL
notation: BC
has revision number: 4
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42183
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42184
has lithology component: BCD CLAY
has lithology component: BCD DMTN
has lithology component: BCD GRAV
has lithology component: BCD SANDU
has lithology component: BCD SILT
has source info: BCD_48872
has source info: BCD_49235
has source info: BCD_49239
has source info: BCD_50626
has obsolete equivalent: BCD mn 241
has obsolete equivalent: BCD mn 507
has obsolete equivalent: BCD mn 987
has obsolete equivalent: BCD mn 240
has obsolete equivalent: BCD mn 2639
broader: Caledonia Glacigenic Group
narrower: Essie Till Formation
narrower: HOBGR
narrower: WHGL
narrower: PGTI
narrower: KBSI
narrower: Clava Shelly Formation
narrower: Alturlie Gravels Formation
narrower: Ardersier Silts Formation
narrower: REDR
narrower: Blackhills Sand And Gravel Formation
has lower boundary definition: Unconformable on bedrock or units of the Banffshire Coast and Caithness (Albion) Glacigenic Subgroup.
has geographical distribution: Southern coast of Moray Firth from Elgin to Peterhead, Caithness and Orkney.
has lithology description: Suite of reddish to dark blue-grey clayey diamictons containing clasts and rafts of Mesozoic rocks derived from the bed of the Moray Firth, also pre-Late Devensian glaciomarine shelly muds.
has thickness description: 30m or more.
has upper boundary definition: Extends to the surface or buried by Late Glacial to Postglacial deposits.

Barracados Cherts
type: Concept
in scheme: NamedRockUnit
alternative label: BCDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
is obsolete equivalent of: BCDC TCH
broader: NE

Brims Castle Dolomite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42185
has lithology component: BCDL DOLMST
has lithology component: BCDL MDST
has lithology component: BCDL SDST
has lithology component: BCDL SLST
has source info: BCDL_50382
has source info: BCDL_50645
has source info: BCDL_51428
has obsolete equivalent: BCDL mn 608
has obsolete equivalent: BCDL mn 2299
has obsolete equivalent: BCDL st 144
broader: MEY
has lower boundary definition: Faulted at Red Geo against the older Scarden Sandstone Member, of the Mey Flagstone Formation.
has geographical distribution: Onshore and immediate offshore of the Dounreay area, Caithness, Northern Scotland.
has lithology description: Ferruginous, dolomitic cycles of laminite-limestone, siltstone and thin, fine-grained sandstone.
has thickness description: 70m
has upper boundary definition: Conformable at the top of the highest dolomitic laminite-limestone against the base of the overlying Tang Sandstone Member.

Ballycultra Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
broader: NE

Brooch Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: BCFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: PMCM

Brandy Craig Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCG
has current status: CURRENT
has theme: BEDRCK
notation: BCG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42186
has lithology component: BCG HY
has lithology component: BCG LAVA
has lithology component: BCG SLST
has lithology component: BCG TUF
has lithology component: BCG VCBR
has source info: BCG_49784
has source info: BCG_49821
has source info: BCG_52231
has obsolete equivalent: BCG mn 575
broader: Balcreuchan Group
has additional age information: Lower Arenig.
has lower boundary definition: Overlies Slockenray Formation.
has geographical distribution: Girvan - Ballantrae area, southwest Scotland.
has lithology description: Pillowed and massive, porphyritic and aphyric lavas with local red horizons suggestive of subaerial weathering.
has thickness description: c.285m
has upper boundary definition: Faulted against Kennedy's Pass Formation and younger rocks of the Barr and Ardmillan groups.

Bottom Crag Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BCGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BCGL LMST
broader: MG

Balclatchie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bch
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42187
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42188
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42189
has lithology component: BCH CONG
has lithology component: BCH MDST
has lithology component: BCH SDST
has lithology component: BCH SLST
has source info: BCH_48694
has source info: BCH_49820
has source info: BCH_52760
has obsolete equivalent: BCH mn 208
has obsolete equivalent: BCH mn 210
has obsolete equivalent: BCH mn 209
has obsolete equivalent: BCH mn 211
broader: Ardwell Subgroup
narrower: Burn Side Conglomerate Member
narrower: Doon Hill Conglomerate Member
narrower: PMP
narrower: KRC
narrower: LAGN
narrower: Bellmoor Member
has lower boundary definition: Rests conformably on Benan Conglomerate (Barr Group).
has geographical distribution: Girvan District, southwest Scotland.
has lithology description: Blue-grey nodular mudstone, siltstone and impersistent conglomerate units.
has thickness description: c.300m
has upper boundary definition: Overlain conformably by the Ardwell Formation.

Beinn Chaisgidle (Centre 2) Suite
type: Concept
in scheme: NamedRockUnit
alternative label: BCHA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BCHA AGG
has lithology component: BCHA AND
has lithology component: BCHA DI
has lithology component: BCHA MCDI
has lithology component: BCHA MCGB
has lithology component: BCHA MCGD
has lithology component: BCHA MCOLGB
has lithology component: BCHA MCQGB
has lithology component: BCHA OLGB
has lithology component: BCHA QGB
broader: MUCC

Benches Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BCHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BCHC COAL
broader: PMCM

Beach Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: BCHD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: BCHD B
has lithology component: BCHD CLAY
has lithology component: BCHD GRAV
has lithology component: BCHD NATD
has lithology component: BCHD SANDU
has lithology component: BCHD SDSH
has lithology component: BCHD SILT
broader: ITD
has lithology description: Shingle, sand, silt and clay; may be bedded or chaotic; beach deposits may be in the form of dunes, sheets or banks. [Generic description].

Buchanan Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCHN
has current status: CURRENT
has theme: SPRFCL
notation: BCHN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42191
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42190
has lithology component: BCHN C
has lithology component: BCHN CZ
has lithology component: BCHN S
has lithology component: BCHN Z
has source info: BCHN_49147
has source info: BCHN_50918
has source info: BCHN_51103
has source info: BCHN_51617
has obsolete equivalent: BCHN mn 656
broader: Clydebank Clay Formation
has lower boundary definition: The Buchanan Clay Member of the Clydebank Clay Formation rests with angular conformity on older Quaternary sediments. It is known to rest on the Gartocharn Till Formation (GATI) of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup).
has geographical distribution: The Buchanan Clay Member of the Clydebank Clay Formation is recognized in the lower Endrick valley near its confluence with Loch Lomond.
has lithology description: The typical lithology is a thinly bedded silt clay with many laminae and thin bands of silt and locally of sand. The deposits are brown, brownish grey and reddish brown, and are conspicuously colour banded, the banding being emphasised by the grey clay units. The consistency varies from soft to stiff and the deposits is of medium to high plasticity.
has thickness description: Veneer to more than 7m.
has upper boundary definition: The Buchanan Clay Member of the Clydebank Clay Formation is overlain conformably by younger Quaternary sediments of the Kilmaronock Silt Formation of the Britannia Catchments Group (Clyde Catchments Subgroup).

Beach Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BCHR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BCHR CONG
has lithology component: BCHR SDST
broader: NE

Burnham Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BCk
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42192
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42193
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42194
has lithology component: BCK CAMDST
has lithology component: BCK CHLK
has lithology component: BCK FLNT
has source info: BCK_48936
has source info: BCK_49495
has source info: BCK_50061
has source info: BCK_50586
has source info: BCK_51213
has source info: BCK_51523
has source info: BCK_52270
has source info: BCK_52668
has obsolete equivalent: BCK mn 695
has obsolete equivalent: BCK mn 868
has obsolete equivalent: BCK mn 4349
broader: Chalk Group
has lower boundary definition: Marked change from massive, rubbly-weathering chalks below, to harder, thinly bedded or nodular chalk above. This horizon lies just below the Ravendale Flint, a tabular or semi-tabular flint up to 0.25m thick, which is the lowest such flint in the Chalk Group and base of the chalk unit in which such flint bands are common. The lowest few metres of the formation comprises hard chalks and thick, closely spaced, tabular flints, which produce a topographic feature by which the base of the formation can be mapped, and a characteristic geophysical log signature enabling its identification in boreholes.
has geographical distribution: Yorkshire and Lincolnshire Wolds and the superficialdeposit-covered area to the east, from Flamborough Head south to the Mablethorpe-Chapel St Leonards area on the Lincolnshire coast (see Sumbler, M G, 1999, Fig.1).
has lithology description: White, thinly-bedded chalk with common tabular and discontinuous flint bands; sporadic marl seams. Formal subdivision: None herein but there are many named marl and flint bands throughout the succession that are used to divide the formation. They are all of bed status.
has thickness description: Generally about 140m; possibly significantly thinner (85-100m) over the Market Weighton High; 105m reported on the Yorkshire coast, but possibly much thicker (up to c.160m).
has upper boundary definition: Top of highest flint band in the thick, flint-rich unit of chalk (ie. the Burnham Formation), succeeded by flint-free chalks (ie. the Flamborough Formation). At Flamborough Head, this is the High Stacks Flint, but elsewhere may be at a somewhat different horizon. The change is particularly marked on borehole sonic velocity logs.

Birky Cleugh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: BCL LMST
broader: MAN
has geographical distribution: Parts of the Bewcastle sheet area, Cumbria.

Boulder Clay And Laminated Clay (Alternate Beds)
type: Concept
in scheme: NamedRockUnit
alternative label: BCLC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BCLC CLAY
has lithology component: BCLC DIAMIT
broader: NE
has lithology description: Composite of 'Boulder Clay': interbedded clay and silty clay, pebbly, reddish brown, stiff, sandy, possibly interbedded with sand and gravel-rich lenses and 'Laminated Clay': clay brown and yellow, laminated; ('Laminated Clay'). [Generic description].

Balnacraig Metabasite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCMB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BCMB MLAVA
has lithology component: BCMB MTUF
broader: QH

Branscombe Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42195
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42196
has lithology component: BCMU GYPST
has lithology component: BCMU MDST
has lithology component: BCMU SDST
has lithology component: BCMU SLST
has source info: BCMU_48671
has source info: BCMU_48761
has source info: BCMU_48797
has source info: BCMU_48817
has source info: BCMU_49047
has source info: BCMU_49048
has source info: BCMU_49873
has source info: BCMU_50329
has source info: BCMU_50812
has source info: BCMU_51403
has source info: BCMU_51595
has source info: BCMU_51674
has source info: BCMU_52009
has source info: BCMU_52146
has source info: BCMU_52154
has source info: BCMU_52516
has source info: BCMU_52591
has source info: BCMU_52875
has source info: BCMU_52982
has obsolete equivalent: BCMU mn 2962
has obsolete equivalent: BCMU mn 4256
has obsolete equivalent: BCMU mn 4284
has obsolete equivalent: BCMU mn 4397
has obsolete equivalent: BCMU mn 4068
has obsolete equivalent: BCMU mn 4257
has obsolete equivalent: BCMU mn 4396
has lateral equivalent: BCMU ELMU
has obsolete equivalent: BCMU mn 624
has lateral equivalent: BCMU TTHY
has obsolete equivalent: BCMU mn 1150
broader: MMG
narrower: NEWG
narrower: TUT
has additional age information: Norian to ?Rhaetian. The precise level of the Norian-Rhaetian boundary in the UK sequence is currently unknown. It could be in the upper Branscombe Formation or in the lower Blue Anchor Formation. The Arden Sandstone Formation is late Carnian, and the upper part of the Blue Anchor Formation is Rhaetian, but there are no dates at all for the whole of the Branscombe Formation or the lower part of the Blue Anchor Formation. The lowest beds of the Blue Anchor Formation in SW England are certainly older than those in the Midlands, where the base of the Blue Anchor Formation is unconformable.
has lower boundary definition: Conformable in all areas. Placed at the base of predominantly red, structureless mudstones where they rest on the interbedded dark green-grey siltstones and pale grey fine-grained sandstones of the underlying Arden Sandstone Formation; the boundary is abrupt, or a rapid, interbedded transition. Where the Arden Sandstone Formation is absent (Cheshire Basin and parts of the Wessex Basin), the boundary is placed immediately above the highest halite beds of the Sidmouth Mudstone Formation (Wilkesley Halite Member, Somerset Halite Member). At the type section, the base of the formation is drawn at a lower stratigraphical level than originally defined by Gallois (2001), to encompass approximately 15m of predominantly reddish-brown mudstone that was included by Gallois in the Dunscombe Mudstone Formation. At outcrop, the boundary is typically marked by a change from the grey, slightly sandy clay soils of the Arden Sandstone Formation to the reddish-brown clayey soils of the Branscombe Mudstone Formation. Where the Arden Sandstone forms a marked cuesta feature, the boundary lies at the down-dip limit of the dip slope. In the Cheshire Basin, where the Arden Sandstone Formation is absent, the boundary is mapped at the approximate down-dip limit of subsidence hollows and collapse breccias, which are associated with near-surface dissolution of halites (Wilkesley Halite Member) at the top of the Sidmouth Mudstone (Taylor et al., 1963).
has geographical distribution: The surface outcrop extends from the South Devon coast northwards into Somerset, Avon and Worcestershire. The formation crops out below parts of the English Central Midlands and Cheshire, and in a strip extending northwards from Nottingham into north Yorkshire. The formation occurs in the subsurface below much of the south Midlands and eastern England. It has equivalents in the Southern North Sea and East Irish Sea basins.
has lithology description: Mudstone and siltstone, red-brown with common grey-green reduction patches and spots. The mudstones are mostly structurless, with a blocky weathering habit. Gypsum/anhydrite, locally of economic importance, is common throughout in beds, nodules and veins. Many of these sulphate beds have been named (e.g. Tutbury Gypsum and Newark Gypsum of the East Midlands) and form distinct markers on geophysical logs. Sporadic thin beds of argillaceous sandstone and silty dolomite occur in the lower part of the formation. Beds of thinly interlaminated, dark grey-green mudstone and dolomitic siltstone occur locally towards the top of the formation (formerly separated in the East Midlands as the Glen Parva Formation, Warrington et al., 1980). Halite is recorded towards the base of the formation in Nettlecombe Borehole, Dorset, SY59NW/1, [SY50520 95440], but is absent elsewhere; halite pseudomorphs are rare.
has thickness description: Up to 240m in the Wessex Basin, 170m in the Worcester Basin; 25 to 60m in the East Midlands, up to 160m in the Cheshire Basin
has upper boundary definition: Placed at an abrupt or rapid upward change from the red-brown, silty mudstones of the Branscombe Mudstone Formation to the green or grey-green, dolomitic mudstones of the Blue Anchor Formation. In parts of southern England and Wales the transition occurs above a unit of interbedded red and green strata (e.g. on the west Somerset and south Devon coasts). The boundary may be locally unconformable, as suggested in the Warwickshire area by Old et al. (1987). At outcrop, the boundary is marked by a change in soil colour from the reddish brown clayey soils of the Branscombe Mudstone Formation to grey clayey soils of the overlying Blue Anchor Formation. Typically, this boundary lies near the base of a scarp slope formed by the Blue Anchor Formation and capped by the Penarth Group.

Balcreuchan Group
type: Concept
in scheme: NamedRockUnit
alternative label: BCN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BCN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42198
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42197
has lithology component: BCN AGG
has lithology component: BCN AMPSCH
has lithology component: BCN BALVPW
has lithology component: BCN BAVBR
has lithology component: BCN CESCH
has lithology component: BCN CHRT
has lithology component: BCN CONG
has lithology component: BCN SLST
has lithology component: BCN TUF
has lithology component: BCN VCSST
has source info: BCN_49596
has source info: BCN_50930
has source info: BCN_51071
has source info: BCN_51860
has source info: BCN_52027
has source info: BCN_52097
has source info: BCN_52305
has obsolete equivalent: BCN mn 2291
broader: Ballantrae Ophiolite Complex
narrower: MHF
narrower: SLO
narrower: PIN
narrower: KDY
narrower: Brandy Craig Lava Formation
narrower: KRY
narrower: Craig Hill Breccia Formation
has lower boundary definition: Not seen. The probable oldest component, the Mains Hill Agglomerate Formation, has its base faulted out by the Stinchar Valley Fault.
has geographical distribution: Between Girvan and Ballantrae, Ayrshire, southwest Scotland.
has lithology description: An interbedded succession of basaltic pillow lava (some are boninitic) and breccia, agglomerate, volcaniclastic sandstone, tuff, siltstone, conglomerate and mudstone-supported melange, and hyaloclastite. Locally sheared and metamorphosed to amphibolitic schist and chlorite-epidote schist. The dominant lavas are contained in faulted, tectonic blocks and are not, for the most part, formally defined as formations. There is good stratigraphical correlation between some of the blocks, but connections are generally tenuous. A number of the more distinctive lithological units have been defined formally as formations.
has thickness description: 1.5 to 2km
has upper boundary definition: The major unconformity at the base of the overlying Barr Group.

Blisco Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bco
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42199
has lithology component: BCO ANDVST
has lithology component: BCO LPTUF
has lithology component: BCO TUF
has source info: BCO_50725
has source info: BCO_50778
has obsolete equivalent: BCO mn 495
has obsolete equivalent: BCO mn 496
broader: Birker Fell Andesite Formation
has lower boundary definition: Overlies Little Stand Tuff; base taken at change from massive rhyolitic tuff to bedded andesitic volcanclastic sandstone.
has geographical distribution: Pike of Blisco to Little Stand between Duddon Valley and Longdale, Cumbria.
has lithology description: Andesitic volcaniclastic sandstone with tuff and lapilli-tuff interbeds; bedded succession.
has thickness description: 0 - 150m
has upper boundary definition: Overlain by unnamed dacite within the Birker Fell Andesite Formation.

Quetivel Mill Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: BCQC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AP
has predominant age: AP
has youngest age: AP
broader: NE

Bell Crags Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BCr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42200
has lithology component: BCR VCBR
has lithology component: BCR VCSST
has lithology component: BCR VSSTP
has source info: BCR_49453
has source info: BCR_52187
has obsolete equivalent: BCR mn 381
broader: SET
has lower boundary definition: Erosional contact on bedded sandstone within the Seathwaite Fell Sandstone Formation.
has geographical distribution: North Lake District, between Borrowdale and Thirlmere.
has lithology description: Matrix-supported, poorly supported pebble to cobble breccia, fining upwards into pebbly sandstone.
has thickness description: 45 - 60m
has upper boundary definition: Erosional contact with disturbed siltstone and sandstone, within the Seathwaite Fell Sandstone Formation.

Briscloonagh Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BCS MDST
has lithology component: BCS SDST
has lithology component: BCS SLST
broader: NE

Birch Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KZ
broader: KC

Ballagan Formation, Clyde Sandstone Formation, Strathclyde Group And Clackmannan Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BCSC
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: BCSC ANHY
has lithology component: BCSC ARLMST
has lithology component: BCSC BA
has lithology component: BCSC BAPOCM
has lithology component: BCSC BAROCM
has lithology component: BCSC BARPMA
has lithology component: BCSC BATUF
has lithology component: BCSC BRPOCM
has lithology component: BCSC CAMDST
has lithology component: BCSC COAL
has lithology component: BCSC CONG
has lithology component: BCSC DOLMST
has lithology component: BCSC FEST
has lithology component: BCSC GYPST
has lithology component: BCSC LMST
has lithology component: BCSC LMSTN
has lithology component: BCSC MDST
has lithology component: BCSC MUG
has lithology component: BCSC PESST
has lithology component: BCSC SAPEL
has lithology component: BCSC SDST
has lithology component: BCSC SEATS
has lithology component: BCSC SLST
has lithology component: BCSC TRBA
has lithology component: BCSC TRR
has lithology component: BCSC TUF
has lithology component: BCSC VLSS
broader: NA

Blaen-Y-Cwm Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BCSH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ON
has predominant age: ON
has youngest age: ON
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42201
has lithology component: BCSH MDST
has source info: BCSH_48690
has obsolete equivalent: BCSH mn 478
broader: NP
has lower boundary definition: Base disconformable on Pen-y-Garnedd calcareous tuffs and tuffites in West Berwyns or The Bryn Siltstone Formation in the North Berwyns.
has geographical distribution: Not defined.
has lithology description: Black and dark-grey graptolitic shales. Pyritous.
has thickness description: Thickness of type section - c.30 metres. Thickness of lateral variation - 0-30 metres.
has upper boundary definition: Unconformably overlain by the siltstones of the Dolhir Formation.

Ballagan Formation, Clyde Sandstone Formation, Strathclyde Group And Lower Limestone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BCSL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BCSL ANHY
has lithology component: BCSL BA
has lithology component: BCSL BAPOCM
has lithology component: BCSL BAROCM
has lithology component: BCSL BARPMA
has lithology component: BCSL BATUF
has lithology component: BCSL BRPOCM
has lithology component: BCSL CAMDST
has lithology component: BCSL COAL
has lithology component: BCSL DOLMST
has lithology component: BCSL FEST
has lithology component: BCSL GYPST
has lithology component: BCSL LMST
has lithology component: BCSL MUG
has lithology component: BCSL PESST
has lithology component: BCSL SAPEL
has lithology component: BCSL SDST
has lithology component: BCSL SEATS
has lithology component: BCSL SLST
has lithology component: BCSL TRBA
has lithology component: BCSL TRR
has lithology component: BCSL TUF
has lithology component: BCSL VLSS
broader: NA

Ballycastle Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: BCSS
has current status: CURRENT
has theme: BEDRCK
notation: BCSS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42202
has lithology component: BCSS BALAVA
has lithology component: BCSS COAL
has lithology component: BCSS LMST
has lithology component: BCSS MDST
has lithology component: BCSS SDST
has lithology component: BCSS SEATS
has lithology component: BCSS SLST
has lithology component: BCSS TUF
has source info: BCSS_50453
broader: NA
narrower: Eglish Sandstone Formation
narrower: Ballyvoy Sandstone Formation
narrower: MUSH
narrower: Carey River Basalt Formation
narrower: Glenshesk Tuff Formation
has lower boundary definition: Unconformity with Dalradian.
has geographical distribution: Data not yet available.
has lithology description: Sandstone, conglomerate, siltstone, basalt lava, mudstone (including fissile mudstone), tuff, coals, seatearths, limestone.
has thickness description: 700m
has upper boundary definition: Present erosion levels.

Ballagan Formation, Clyde Sandstone Formation And Strathclyde Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BCST
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: BCST ANHY
has lithology component: BCST BA
has lithology component: BCST BAPOCM
has lithology component: BCST BAROCM
has lithology component: BCST BARPMA
has lithology component: BCST BATUF
has lithology component: BCST BRPOCM
has lithology component: BCST CAMDST
has lithology component: BCST COAL
has lithology component: BCST DOLMST
has lithology component: BCST FEST
has lithology component: BCST GYPST
has lithology component: BCST LMST
has lithology component: BCST MUG
has lithology component: BCST PESST
has lithology component: BCST SAPEL
has lithology component: BCST SEATS
has lithology component: BCST TRBA
has lithology component: BCST TRR
has lithology component: BCST TUF
has lithology component: BCST VLSS
broader: NA

Beacon Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BCT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BcT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42204
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42203
has lithology component: BCT DATUF
has lithology component: BCT LPTUF
has lithology component: BCT TFSLST
has lithology component: BCT TUF
has source info: BCT_50921
has source info: BCT_51833
has source info: BCT_52376
has obsolete equivalent: BCT mn 325
broader: Beacon Hill Formation
has lower boundary definition: Not exposed; thought to be sharp to gradational on grey lapilli tuff and volcanic breccia of the Benscliffe Breccia Member.
has geographical distribution: From Nanpantan Hills it extends southwards to Beacon Hill, Broombriggs Hill and Ling Hill. Poorly exposed west of Benscliffe Wood.
has lithology description: Medium- to thickly-bedded blue-grey, fine- to coarse-grained tuffs and tuffaceous siltstones, and beds of massive, grey, dacitic lithic-crystal tuff and lapilli tuff.
has thickness description: c.880m
has upper boundary definition: Not exposed, but probably sharply overlain by volcaniclastic sandstones and breccia of the Sandhills Lodge Member.

Boyne Craig Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BCTI
has current status: CURRENT
has theme: SPRFCL
notation: bct
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42205
has lithology component: BCTI CLAY
has lithology component: BCTI DMTN
has lithology component: BCTI GRAV
has lithology component: BCTI SANDU
has source info: BCTI_48931
has source info: BCTI_51508
has obsolete equivalent: BCTI mn 4310
broader: Central Grampian (Albion) Glacigenic Subgroup
has lower boundary definition: Unconformable on bedrock, commonly decomposed.
has geographical distribution: Scotland sheet 96 (Portsoy).
has lithology description: Diamicton, clayey, sandy, gravelly, dark yellowish brown to orangey brown. Containing much decomposed calc-silicate rock and clasts of quartzite, psammite, gabbro and probable Triassic sandstone.
has thickness description: >5m
has upper boundary definition: Unconformable contact with Old Hythe Till Formation or glacitectonic contact with Whitehills Glacigenic Formation.

Beechwood Conglomerate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BCWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BCWC CONG
has source info: BCWC_49789
has lateral equivalent: BCWC st 93
broader: TLM

Brick Clay
type: Concept
in scheme: NamedRockUnit
alternative label: BCY
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BCY CLAY
has lithology component: BCY SILT
broader: NE
has lithology description: Varies from silt to clay, usually yellow-brown and massive. [Generic description].

Bottom Coatyards Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BCYD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BCYD COAL
broader: SMGP

Brithdir Member
type: Concept
in scheme: NamedRockUnit
alternative label: BD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42206
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42207
has lithology component: BD COAL
has lithology component: BD CONG
has lithology component: BD LAREN
has lithology component: BD MDST
has lithology component: BD SDST
has lithology component: BD SEATM
has lithology component: BD SEATS
has lithology component: BD SLST
has source info: BD_49279
has source info: BD_52073
has source info: BD_52938
has obsolete equivalent: BD mn 610
has obsolete equivalent: BD mn 611
broader: PES
narrower: Brithdir Coal (South Wales)
narrower: Brithdir Rider Coal (South Wales)
narrower: Dirty Coal (South Wales)
narrower: Dirty Rider Coal (South Wales)
narrower: Cilmaenllwyd Coal (South Wales)
narrower: Cwm Mawr Coal (South Wales)
narrower: Goodig Coal (South Wales)
narrower: Graig Coal (South Wales)
narrower: Glyngwilym Coal (South Wales)
has lower boundary definition: The base is placed at the base of the Brithdir Coal, above "Pennant" sandstones and thin mudstones/siltstones of the Rhondda Member or above red/green mudstones of the Deri Formation on the east crop of the coalfield.
has geographical distribution: Extensive throughout the South Wales Coalfield, from Pembrey [SN 42 02] east to Blaenavon [SO 230 085] and, on the south crop, from Gower, [SS 545 960] to Pontypool [ST 268 990].
has lithology description: Green-grey, lithic arenites ("Pennant sandstones") with conglomerate lenses at bases of units; thin mudstone/siltstone and seatearth interbeds and mainly thin coals.
has thickness description: 45m in the Pontypool area [ST 268 990] to 200m in the Swansea area [SS 660 945].
has upper boundary definition: The top is placed at the base of the Hughes (Cefn Glas) Coal, where the coal rests on either "Pennant" sandstones or thin mudstones/siltstones at the top of the Brithdir Member. The coal is overlain by "Pennant" sandstones or thin mudstones/siltstones of the Hughes Member.

Bowden Way Beds And Acuminata Beds (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BDAC
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: BDAC CAMDST
has lithology component: BDAC LMST
has lithology component: BDAC SHMDST
broader: LFE

Bracadale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDALE
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42208
has lithology component: BDALE BENMOR
has lithology component: BDALE MUG
has lithology component: BDALE TR
has source info: BDALE_50384
has source info: BDALE_51743
has source info: BDALE_51835
has obsolete equivalent: BDALE mn 559
broader: SKYL
has lower boundary definition: Overlies the Beinn Totaig Formation.
has geographical distribution: Northern Skye.
has lithology description: Mugearites, benmoreites and trachytes, both porphyritic and non-porphyritic, are typical of these evolved flows.
has thickness description: To 120m
has upper boundary definition: Overlain by the Osdale Formation.

Bradford Dale Lava
type: Concept
in scheme: NamedRockUnit
alternative label: BDB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bardon Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: BDBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BdB
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42209
has lithology component: BDBR AND
has lithology component: BDBR VCBR
has source info: BDBR_49533
has source info: BDBR_49534
has source info: BDBR_50482
has source info: BDBR_52376
has obsolete equivalent: BDBR mn 19
broader: Bardon Hill Volcanic Complex
has lower boundary definition: Displays a sharp contact with the volcaniclastic sandstone of the Bardon Hill Volcanic Complex.
has geographical distribution: Mainly restricted to the western side of Charnwood Forest at Bardon Hill Quarry. May also extend eastwards to Birch Hill.
has lithology description: Massive to brecciated, green-grey, locally porphyritic andesite. Grades into hyaloclastic breccia with localised blocks of black-rimmed spherulitic andesite.
has thickness description: At least 200m thick.
has upper boundary definition: Not seen, only found in fault contact with the volcaniclastic siltstones and sandstones of the Bradgate Formation.

Big Drum Coal (Lanarkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BDC COAL
broader: LSC

Ben Dorrery Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BDCM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has obsolete equivalent: BDCM mn 4320
broader: LYBR

Bradley Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BDCO
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BDCO COAL
broader: NE

Baddinsgill Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BDD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BDD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42210
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42211
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42212
has lithology component: BDD MDST
has lithology component: BDD SLMDST
has source info: BDD_48654
has source info: BDD_49222
has source info: BDD_49223
has source info: BDD_49784
has source info: BDD_50454
has source info: BDD_51092
has source info: BDD_51262
has source info: BDD_51491
has obsolete equivalent: BDD mn 356
has obsolete equivalent: BDD mn 361
has obsolete equivalent: BDD mn 4422
has obsolete equivalent: BDD mn 4437
has obsolete equivalent: BDD mn 4317
has obsolete equivalent: BDD mn 4432
broader: WLN
has lower boundary definition: Conformable on Lamb Rig Siltstone Member: First appearance of olive-grey silty mudstone.
has geographical distribution: Pentland Hills, Midland Valley.
has lithology description: Laminated grey and brown mudstones and silty shales. No sediment coarser than siltstone.
has thickness description: 155m
has upper boundary definition: Conformable: Highest red, poorly lithified shales below coarse-grained sandstone of the Henshaw Formation.

Berriedale Flagstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: BDF SDST
has lithology component: BDF SLST
has obsolete equivalent: BDF mn 269
broader: LCF

Bedlam Gill Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: BDGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BDGC COAL
broader: SMGP

Beaconsfield Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BDGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42213
has lithogenesis: FLUV
has lithology component: BDGR CLAY
has lithology component: BDGR GRAV
has lithology component: BDGR SANDU
has source info: BDGR_51689
has source info: BDGR_52631
has obsolete equivalent: BDGR mn 1986
has obsolete equivalent: BDGR PLG
broader: NE
has lower boundary definition: Erosional base on Tertiary-Cretaceous bedrock.
has geographical distribution: Thames Valley.
has lithology description: Gravel, variably clayey and sandy. [Generic description: Geol Soc Lond Special Publication Report 4, 2nd edition].
has thickness description: 1-7m
has upper boundary definition: Erosional remnants of terrace surface.

Birdshill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BDH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Ben Dubhain Breccia And Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: BDHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Bardon Hill Volcanic Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BDHV
has current status: CURRENT
has theme: BEDRCK
notation: BVC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42214
has lithology component: BDHV AND
has lithology component: BDHV DA
has lithology component: BDHV HY
has lithology component: BDHV PEP
has lithology component: BDHV VCSST
has source info: BDHV_49533
has source info: BDHV_50482
has source info: BDHV_52376
has source info: BDHV_52379
broader: Charnian Supergroup
narrower: Bardon Breccia
narrower: PLPD
has lower boundary definition: Not seen.
has geographical distribution: Western Charnwood Forest, between Bardon Hill Quarry, Bardon Hill and Birch Hill.
has lithology description: An assemblage with no obvious stratigraphy, consisting of andesite breccia (Bardon Breccia) and porphyritic dacite (Peldar Porphyritic Dacite).
has thickness description: At least 250 m thick.
has upper boundary definition: Possible fault contact with Precambrian volcaniclastic siltstones and sandstones of the Bradgate Formation.

Beinn An Dubhaich Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BDL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE

Bradley Flags
type: Concept
in scheme: NamedRockUnit
alternative label: BDLF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42215
has lithology component: BDLF SDST
has source info: BDLF_48801
has source info: BDLF_51343
has source info: BDLF_51611
broader: MG
has lower boundary definition: Base of lowermost thick fine-grained and micaceous sandstone above the Bradley Coal. Note that this definition is more restricted than the definition of Stephens et al. (1953), who included all sandstones above the Bradley Coal.
has geographical distribution: Restricted to the northwest part of the Bradford district (Sheet 69).
has lithology description: Fine-grained sandstone interbedded with micaceous mudstone. The sandstone is highly micaceous, flaggy, with planar bedding and lamination displaying primary current lineations, cross bedding with burrow traces in places and both wave and current ripple cross lamination.
has thickness description: Maximum of 25m at Bradley.
has upper boundary definition: Passage from the fine-grained sandstone of the Bradley Flags into the overlying dark grey mudstones containing the Cravenoceras cowlingense Marine Band.

Brockley Down Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BDLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JH
broader: NP

Bottom Durham Low Main Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BDLO
has current status: CURRENT
has theme: BEDRCK
notation: BDLM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BDLO COAL
has lateral equivalent: BDLO st 448
broader: PMCM

Bedhampton Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: BDMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: PCK

Bedhampton Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: BDMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: PCK

Bedhampton Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: BDMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: PCK

Blairdaff Moraine Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDMO
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: BM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42216
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42217
has lithology component: BDMO B
has lithology component: BDMO CLAY
has lithology component: BDMO DMTN
has lithology component: BDMO GRAV
has lithology component: BDMO SANDU
has lithology component: BDMO SILT
has source info: BDMO_50626
has obsolete equivalent: BDMO mn 2051
broader: East Grampian Glacigenic Subgroup
has lower boundary definition: Generally a sharp, undulating, unconformable contact with a yellowish brown, gravelly clayey sand diamicton of the Banchory Till Formation and other sandy tills of the East Grampian Glacigenic Subgroup.
has geographical distribution: East Aberdeenshire: sheets S76E, S77, S66E, S67.
has landform description: Forms hummocky ground and cross-valley moraine ridges.
has lithology description: Typically yellowish brown, crudely bedded, angular to well-rounded clasts, with extremely variable sorting, of both matrix- and clast-supported clayey gravel, with boulders and sandy diamicton, composed of psammite, metagreywacke, granite and quartzite, with some gneiss, slate and dolerite, elsewhere locally formed of mainly granite or gabbroic rocks, forming hummocky ground and cross-valley moraine ridges.
has thickness description: To 10m
has upper boundary definition: Generally the present ground surface.

Breadstone Shale Formation And Micklewood Beds (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BDMW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has lithology component: BDMW AROC
broader: NA
has geographical distribution: Tortworth Inlier.
has lithology description: See the Lithology descriptions for the component units.

Bowden Way Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BDN
has current status: CURRENT
has theme: BEDRCK
notation: Bdn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42219
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42218
has lithology component: BDN CAMDST
has lithology component: BDN LMST
has source info: BDN_48762
has source info: BDN_48763
has source info: BDN_50401
broader: LFE
has lower boundary definition: Transition from dark olive grey fissile mudstone to calcareous mudstone.
has geographical distribution: Sherborne Park, Sherborne, Dorset, to Milborne Wick, Somerset.
has lithology description: Calcareous mudstones with intervals of argillaceous limestone. NOTE: Map code 'Bdn' combines Bowden Way Beds with Acuminata Beds.
has thickness description: 11.6m (Type Section), 21.2m (Purse Caundle Borehole).
has upper boundary definition: Transition from calcareous mudstone to shell-detrital mudstones of the Acuminata Beds.

Beadnell Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BDNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BDNL COAL
broader: LLG

Bindon Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BDNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
broader: UGS

Bryn Dowsi Mudstone
type: Concept
in scheme: NamedRockUnit
alternative label: BDO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42220
has lithology component: BDO MDST
has lithology component: BDO SDST
has lithology component: BDO SLMDST
has source info: BDO_52509
broader: NE
has lower boundary definition: Not defined.
has geographical distribution: Not defined.
has lithology description: Mudstones - dark grey. Underlying unit grey silty mudstones with sandstones, overlying unit pale mudstones.
has thickness description: 50 - 120 metres.
has upper boundary definition: Not defined.

Bad Step Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: BDP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bdp
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42221
has lithology component: BDP RYTUF
has source info: BDP_50725
has source info: BDP_50955
has obsolete equivalent: BDP mn 194
broader: Crinkle Tuff Member
has lower boundary definition: Base of rhyolitic, lava-like tuff. Unconformable on various units within the underlying Long Top Tuffs of Airy's Bridge Tuff Formation.
has geographical distribution: Borrowdale, Eskdale to Langdale. Hard Knott (NY 233 025) to White Gill Crag (NY 298 070), Cumbria.
has lithology description: White to pink weathered rhyolitic, high-grade lava-like tuff; garnetiferous.
has thickness description: 40 - 400m
has upper boundary definition: By overlying Crinkle Member of Airy's Bridge Tuff Formation.

Broadford Beds Formation And Pabay Shale Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BDPY
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
broader: LI

Beinn Donn Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BDQU PELGP
has lithology component: BDQU QZITE
has lithology component: BDQU SPFLG
broader: Islay Subgroup

Border Group
type: Concept
in scheme: NamedRockUnit
alternative label: BDR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BDR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42222
has lithology component: BDR ARLMST
has lithology component: BDR BA
has lithology component: BDR BAANDT
has lithology component: BDR COAL
has lithology component: BDR CONG
has lithology component: BDR DOLMST
has lithology component: BDR LMST
has lithology component: BDR MDST
has lithology component: BDR SDST
has lithology component: BDR SEATS
has lithology component: BDR SLST
has lithology component: BDR TUF
has source info: BDR_49230
has source info: BDR_49231
has source info: BDR_49510
has source info: BDR_49797
has source info: BDR_50078
has source info: BDR_50087
has source info: BDR_50675
has source info: BDR_50832
has source info: BDR_52465
has source info: BDR_52512
has source info: BDR_53020
has obsolete equivalent: BDR mn 3402
broader: NP
narrower: Crying Crag Sandstone
narrower: MLL
narrower: MPIL
narrower: ISB
narrower: JCL
narrower: JPL
narrower: SLP
narrower: SVLC
narrower: SVLS
narrower: SWS
narrower: OKST
narrower: WHCO
narrower: WLL
narrower: WSNC
narrower: Christy's Walls Coal
narrower: LARS
narrower: Hens Sike Coal
narrower: Collering Sandstone
narrower: Crammel Linn Sandstone
narrower: NMS
narrower: SHCL
narrower: SHHC
narrower: LWHC
narrower: LWSL
narrower: LYNE
narrower: LMPS
narrower: Bearsmouth Or Thorneyburn Coal
narrower: TCS
narrower: THBN
narrower: Chirdon No.1 Coal
narrower: Chirdon No.1 Limestone
narrower: Chirdon No.2 Coal
narrower: Chirdon No.2 Limestone
narrower: Channelbush Coal
narrower: Channelbush Limestone
narrower: Clock's Cleuch Coal

Brithdir Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BDRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BDRC COAL
broader: Brithdir Member

Borders Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BDRGL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42223
has lithology component: BDRGL C
has lithology component: BDRGL DMTN
has lithology component: BDRGL S
has lithology component: BDRGL V
has lithology component: BDRGL Z
has source info: BDRGL_49715
has source info: BDRGL_50291
has source info: BDRGL_50396
has source info: BDRGL_51617
broader: Caledonia Glacigenic Group
narrower: NMTI
has lower boundary definition: Sharp, unconformable contact with bedrock. Pre-Ipswichian Quaternary deposits are not proved within the Scottish Borders.
has geographical distribution: Distributed across the Merse of Berwickshire from the Lammermuir Hills in the north to the margins of the Cheviot Hills in the south. Units of the subgroup might occur locally beyond these geographical boundaries and beyond the approximate surface boundaries with adjacent glacigenic subgroups (e.g. the North Sea Coast Glacigenic Subgroup). Units might also extend offshore,
has lithology description: Suite of glacial, glaciofluvial and glaciolacustrine deposits including sandy diamictons (till), sand, gravel, silt and clay. The sediments were deposited by or are the deglaciation products of ice which emanated from the Southern Uplands and streamed eastwards aound the northern margins of the Cheviot Hills across the Merse of Berwickshire. The deposits contain clasts derived from Devonian and Carboniferous sedimentary rocks (sandstone, siltstone, mudstone) and volcanic and intrusive rocks (basalt, andesite) of the Cheviot Hills and the Kelso district. Varying proportions of Lower Palaeozoic wacke sandstone and siltstone are also present. Tills are generally matrix-supported diamictons with characteristically brownish grey or yellowish grey matrices. However, locally they can be reddish brown, either where the diamictons are weathered or are derived from red strata (e.g. Devonian outcrops).
has thickness description: To 30m
has upper boundary definition: Unconformable contact with units of the Britannia Catchments Group (Tweed Catchments Subgroup) and the British Coastal Deposits Group.

Brithdir Coal (Lower Leaf) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BDRLL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BDRLL COAL
broader: SWLCM

Brithdir Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BDRR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BDRR COAL
broader: Brithdir Member

Brithdir Coal (Upper Leaf) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BDRUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BDRUL COAL
broader: SWUCM

Bridport Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BdS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42224
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42225
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42226
has lithology component: BDS LMST
has lithology component: BDS MDST
has lithology component: BDS SANDU
has lithology component: BDS SDST
has lithology component: BDS SILT
has lithology component: BDS SLST
has source info: BDS_49471
has source info: BDS_49475
has source info: BDS_51388
has source info: BDS_51615
has source info: BDS_51796
has source info: BDS_51874
has obsolete equivalent: BDS mn 603
has obsolete equivalent: BDS mn 604
has obsolete equivalent: BDS mn 1082
has obsolete equivalent: BDS mn 1084
has obsolete equivalent: BDS mn 2893
has obsolete equivalent: BDS mn 4407
has obsolete equivalent: BDS mn 4717
broader: LI
narrower: Ham Hill Limestone Member
narrower: Down Cliff Clay Member
has lower boundary definition: Base of sand/silt or mudstone, as described in the Lithological Description, resting non-sequentially on limestone of the Beacon Limestone Formation or, north of c.Chipping Sodbury area in the Worcester Basin, a gradational boundary with mudstone of the Whitby Mudstone Formation (q.v.)
has geographical distribution: Wessex Basin to Worcester Basin (Dorset Coast to central Cotswolds, Cheltenham area).
has lithology description: Grey, weathering yellow or brown, micaceous silt, very fine-grained sand and fine-grained sand, locally with calcite-cemented sandstone beds and lenses, variably sandy clay/mudstone at base, including Downcliff Clay [Member] of type area (Knox, R W O'B, Morton, A C and Lott, G K, 1982; Hesselbo, S P and Jenkyns, H C, 1995, and references therein).
has thickness description: To c.120m
has upper boundary definition: Non sequential; base of lowest limestone (commonly sandy) of the Inferior Oolite Group resting on sand/silt or mudstone (as in the Lithological Description), or on "[Cotswold] Cephalopod Bed" (sandy and argillaceous, ironshot commonly fossiliferous limestone) in the Worcester Basin area.

Berriedale Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has lithology component: BDSA BREC
has lithology component: BDSA LMST
has lithology component: BDSA MDST
has lithology component: BDSA SDST
has lithology component: BDSA SLST
has obsolete equivalent: BDSA mn 412
has obsolete equivalent: BDSA mn 413
broader: LCF
narrower: Badbea Breccio-Conglomerate Member

Breadstone Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42227
has lithology component: BDSH MDST
has lithology component: BDSH SDST
has source info: BDSH_49880
has source info: BDSH_50195
has source info: BDSH_52401
has obsolete equivalent: BDSH mn 581
broader: NA
has lower boundary definition: Not seen. Strata beneath the Breadstone Shale Formation are not exposed in the Tortworth Inlier.
has geographical distribution: The northern end of the Lower Palaeozoic Tortworth Inlier, between Purton (SO 691 042) and Newport (ST 699 977).
has lithology description: Fissile, micaceous, grey to bluish grey or greenish grey mudstone, with bands of fine-grained sandstone and rare thin calcareous beds with cone-in-cone concretions.
has thickness description: Estimated to be about 1500 thick.
has upper boundary definition: Overlain by the Micklewood Beds (Tremadoc). Contact not seen but probably conformable and gradational. The Micklewood Beds are distinguished from the Breadstone Shale Formation by the more common occurrence of flaggy sandstone and siltstone beds.

Braich Tu Du Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BDT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42228
has lithology component: BDT RY
has lithology component: BDT TUF
has source info: BDT_49974
has source info: BDT_50521
has source info: BDT_52199
broader: LLV
has lower boundary definition: Overlies mudstones of the Nant Ffrancon Subgroup and locally the Foel Grach Basalt Formation, with which it interdigitates.
has geographical distribution: South of Foel Fras, south-west to Nant Peris.
has lithology description: Rhyolite lava flows with acidic tuffs.
has thickness description: Up to 195m, thinning to the north and south.
has upper boundary definition: Overlain by Foel Fras Volcanic Complex, and locally by part of the Nant Ffrancon Subgroup.

Brewood Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BDTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42229
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42230
has source info: BDTI_49767
has source info: BDTI_49768
has source info: BDTI_49769
has source info: BDTI_51013
has source info: BDTI_51440
has source info: BDTI_51896
has source info: BDTI_52805
has obsolete equivalent: BDTI mn 4304
has lateral equivalent: BDTI st 784
broader: ISCG
has lower boundary definition: Sharp, unconformable contact with fluviatile gravel (Four Ashes Sand and Gravel Formation) containing mainly well rounded clasts derived from the Kidderminster Formation (Bunter Pebble Beds) conglomerates and numerous organic-rich lenses of Ipswichian to Middle Devensian age. The diamicton is heavily cryoturbated at the type section at Four Ashes where it has been loaded down into the underlying gravel.
has geographical distribution: The ground lying within the generally accepted Late Devensian glacial limit in Staffordshire, but outside the Wrexham-Ellesmere-Whitchurch-Barr Hill Moraine in Cheshire.
has lithology description: Reddish brown, gravelly sandy silty clayey diamicton dominated by locally-derived clasts such as of the Kidderminster Formation (Bunter Pebble Beds) conglomerates, but with a significant proportion of erratics including grey granite from the Southern Uplands, striated volcanic rocks, Eskdale Granite, Ennerdale Granophyre and slates from the Lake District, limestone, flint and marine shells. The tills are typically thinner, more eroded, more weathered and considerably more cryoturbated than those of the Stockport Glacigenic Formation lying to the north of the Wrexham-Ellesmere-Whitchurch-Barr Hill Moraine in Cheshire.
has thickness description: 3 m at type section. Up to 17 m at Madeley in Telford district
has upper boundary definition: The ground surface or unconformable contacts with glaciofluvial sand and gravel or younger Quaternary deposits.

Balderton Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BDTN
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42231
has lithogenesis: FLUV
has lithology component: BDTN C
has lithology component: BDTN P
has lithology component: BDTN S
has lithology component: BDTN V
has lithology component: BDTN Z
has source info: BDTN_48837
has source info: BDTN_49166
has source info: BDTN_49167
has source info: BDTN_49168
has source info: BDTN_49450
has source info: BDTN_49709
has source info: BDTN_50347
has source info: BDTN_50409
has source info: BDTN_50603
has source info: BDTN_50918
has source info: BDTN_52160
has source info: BDTN_52386
has source info: BDTN_52457
has source info: BDTN_52487
has source info: BDTN_52748
has obsolete equivalent: BDTN mn 215
has obsolete equivalent: BDTN mn 216
has obsolete equivalent: BDTN mn 370
has obsolete equivalent: BDTN ORG
has obsolete equivalent: BDTN WHAT
has obsolete equivalent: BDTN mn 369
broader: TRVA
has additional age information: Middle Pleistocene (MI Stage 7 to 6).
has lower boundary definition: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock and possibly, very locally, on the Skellingthorpe Clay Member of the Wolston Formation.
has geographical distribution: Newark upon Trent to Lincoln Gap (see Brandon and Sumbler, 1991, Figure 1) with possible outliers (Whatton Sand and Gravel) present to the southwest of Newark. British Geological Survey sheets 113, 114, 126, 127.
has lithology description: Predominantly cold-phase sands and gravels that underlie the Balderton Terrace. Orange-brown sandy gravel dominated by rounded pebbles of "Bunter" quartz/quartzite (c.75%) with subordinate subangular flint (c.15%), and rarer Triassic sandstone, etc. Infills a broad sinuous channel extending northeast from Newark towards the Lincoln Gap; terrace surface falls from c.20m above OD (c.10m above the Trent floodplain) to c.11m OD. Sections show intraformational and epigenetic ice wedge casts. Upper part locally includes a thin fluvio-aeolian coversand (Whisby Sand Bed, pre-Ipswichian) and a rubified paleosol (Hykeham Soil: Ipswichian). Basal part locally includes channel-filling organic silts (Thorpe on the Hill Bed), which yield a temporate flora and fauna assigned to MIS 7. Correlated with the Southrey Sand and Gravel Member (Trent Valley Formation, pre-diversionary River Trent east of Lincoln Gap) and Egginton Common Sand and Gravel Member (Trent Valley Formation).
has supplementary information: The definition compiler notes: At Newark itself this terrace seems to be at c.18m, which (depending upon how the profile is drawn) could read as only 7m above the Trent - hence previous confusion with the Beeston Terrace. However, the terrace here could be degraded in some way, because it is slightly higher than this "downstream". If the profile is projected back towards Newark it "ought" to be 10 or 11m above the modern floodplain.
has thickness description: 0 to c.9m; typically c.6 to 8m
has upper boundary definition: Ground surface.

Bodieve Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: BDV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: NE

Bodwr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BDWR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BDWR COAL
broader: Hughes Member

Bembridge Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GR
broader: NE
narrower: Bembridge Limestone Formation
narrower: Bembridge Oyster Beds
narrower: Bembridge Marls Formation
has geographical distribution: Isle of Wight.

Bealsmill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42232
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42233
has lithology component: BEAL CONG
has lithology component: BEAL MDST
has lithology component: BEAL SDST
has lithology component: BEAL SLST
has source info: BEAL_49095
has source info: BEAL_49280
has source info: BEAL_49498
has source info: BEAL_49645
has source info: BEAL_50450
has source info: BEAL_51644
has source info: BEAL_52501
has obsolete equivalent: BEAL mn 328
has obsolete equivalent: BEAL mn 1425
has obsolete equivalent: BEAL mn 3126
has obsolete equivalent: BEAL mn 327
has obsolete equivalent: BEAL CKF
has obsolete equivalent: BEAL mn 2873
broader: HOWY
has lower boundary definition: The depositional lower boundary is not seen as the base is always faulted. The lower boundary is thought to post-date the D1 deformation phase, with the formation resting unconformably on Dinantian sequences.
has geographical distribution: Mapped from Altarnun (SX 22 81), east Cornwall to northwest Dartmoor (SX 49 85), but thought to extend into the southwestern part of the Okehampton area (SX 53 87), mid Devon, where is has been mapped as Crackington Formation. Formational diagnosis needs further work, as does the area where it has not been mapped.
has lithology description: Thin- to thick-bedded commonly coarse and feldspathic sandstones interbedded with siltstones and dark grey mudstones. Scattered beds of ill-sorted pebble to cobble conglomerate up to 2m thick contain clasts including chert, lava and limestone as well as derived Dinantian and ?Namurian fossils. Some channels are present.
has thickness description: Unknown. Minimum thickness 120m
has upper boundary definition: The depositional upper boundary is not seen but probably tectonic.

Bearreraig Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BeaS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42234
has lithology component: BEAS CALSST
has lithology component: BEAS LMST
has lithology component: BEAS MDST
has lithology component: BEAS SDST
has source info: BEAS_49488
has source info: BEAS_49569
has source info: BEAS_50053
has source info: BEAS_52637
has obsolete equivalent: BEAS mn 329
broader: NP
narrower: Beinn Na Leac Member
narrower: Garantiana Mudstone Member
narrower: Druim An Fhurain Sandstone Member
narrower: RAAS
narrower: Dun Caan Shale Member
narrower: Balachuirn Sandstone Member
has additional age information: Upper? Toarcian to Upper? Bajocian.
has lower boundary definition: Erosive unconformity on the Lias Group (PEE, RASL and SCS).
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: The Bearreraig Sandstone Formation consists of the Druim An Fhurain Sandstone Member (DAFS) and the Garantiana Mudstone Member (GaSh). See also the descriptions for these units. There are three cycles of deposition within the formation; the first is cross-bedded sandstone and sandy limestones, deposited as tidal sand waves. The cross-bedded facies passes laterally to massive sandstones with doggers, then to upward-coarsening cycles of mudstone, siltstone and sandstone. The third facies consists of mudstones, silty and sandy limestones.
has thickness description: To 488m
has upper boundary definition: Change from marine sandstones to estuarine mudstones of the Cullaidh Shale Formation.

Beauly Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEAU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: Dornoch Formation

Bealbury Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEAY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42235
has lithology component: BEAY MDST
has lithology component: BEAY SLST
has lithology component: BEAY SLTE
has source info: BEAY_50924
broader: NP
has lower boundary definition: Faulted.
has geographical distribution: East Cornwall.
has lithology description: Green and blue green shale and siltstone, with purple slate.
has thickness description: Not known.
has upper boundary definition: Faulted.

Benthall Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Beb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SH
has predominant age: SH
has youngest age: SH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42236
has lithology component: BEB LMST
has lithology component: BEB SLST
has source info: BEB_48909
has obsolete equivalent: BEB mn 403
broader: WEL
has lower boundary definition: Transitional. Base of limestone-siltstone sequence of above type, resting conformably on calcareous siltstones of the underlying Tickwood Beds; lateral passage to reef facies.
has geographical distribution: North Shropshire.
has lithology description: Coarse-grained shelly limestone, interbedded with impersistent siltstone beds in lower and upper parts.
has thickness description: 15 - 30m
has upper boundary definition: Base of thinly bedded crinoidal limestones of the overlying (undivided) uppermost part of the Much Wenlock Limestone Formation.

Beinn Bhreac Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEBH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BEBH LMST
has lithology component: BEBH MLMST
has lithology component: BEBH PEL
has lithology component: BEBH PSAMM
broader: Ballygrant Formation

Batchie Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BEBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: LSC

Belton Brae Vent
type: Concept
in scheme: NamedRockUnit
alternative label: BEBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BEBR AGG
has lithology component: BEBR TUF
broader: SSDLO

Beannan Buidhe Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Port Askaig Tillite Formation

Beccles Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Becton Bunny Member
type: Concept
in scheme: NamedRockUnit
alternative label: BECB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Barton Group

Best Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: BECC
has current status: CURRENT
has theme: BEDRCK
notation: B
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BECC COAL
broader: PLCM

Becton Sand Formation And Chama Sand Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BECH
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
broader: Barton Group
has lithology description: See the Lithology descriptions for the component formations.

Benholm Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BECL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: BC
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42237
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42238
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42239
has lithogenesis: GLACI
has lithology component: BECL CLAY
has lithology component: BECL CLSH
has lithology component: BECL DMTN
has lithology component: BECL GRAV
has lithology component: BECL SILT
has source info: BECL_48885
has source info: BECL_50626
has source info: BECL_51777
has source info: BECL_52387
has source info: BECL_52712
has obsolete equivalent: BECL mn 466
has obsolete equivalent: BECL mn 465
has obsolete equivalent: BECL mn 1983
broader: LBAG
has lower boundary definition: Unconformable on bedrock and conformable or tectonic contact on Birnie Gravel Formation.
has geographical distribution: Burn of Benholm area and coastal exposures on Kincardine coast between Inverbervie and St.Cyrus.
has lithology description: Dark grey shelly silty clay with broken marine bivalve shells and sparse clasts of sandstone, andesite, siltstone and limestone.
has thickness description: 4.6m+
has upper boundary definition: Tectonic contacts with Burn of Benholm Peat Bed or Mill of Forest Till Formation.

Berriedale Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: BECO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
broader: NE

Becton Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BECS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BECS SANDU
has obsolete equivalent: BECS mn 333
broader: Barton Group

Belsay Dene Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BEDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BEDC COAL
broader: SMGP

Bedruthan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEDN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DI
broader: NA

Bedrock Theme Not Mapped [For Digital Map Use Only]
type: Concept
in scheme: NamedRockUnit
alternative label: BEDNM
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has obsolete equivalent: BEDNM mn 348
broader: NA
has supplementary information: This code is specifically intended for use in labelling digital geological maps and should not be used for any other purpose.

Belah Dolomite
type: Concept
in scheme: NamedRockUnit
alternative label: BEDO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: BEDO ARRD
has lithology component: BEDO DOLO
broader: Eden Shales Formation

Offshore Bedrock Theme Not Mapped [For Digital Map Use Only]
type: Concept
in scheme: NamedRockUnit
alternative label: BEDOF
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has obsolete equivalent: BEDOF mn 3120
broader: NE
has supplementary information: This code is specifically intended for use in labelling digital geological maps and should not be used for any other purpose.

Beinn Edra Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEDRA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42240
has lithology component: BEDRA BAALK
has source info: BEDRA_50384
has source info: BEDRA_51743
has source info: BEDRA_51835
has obsolete equivalent: BEDRA mn 374
broader: SKYL
has lower boundary definition: Overlies the Portree Hyaloclastite Formation.
has geographical distribution: Northern Skye.
has lithology description: Consists mainly of alkali basalt flows. Evolved composition lavas are present, but rare.
has thickness description: To 300m
has upper boundary definition: Partially overlain by the Ramasaig Formation and the later Beinn Totaig Formation in central north Skye.

Bedchester Sands Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEDS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BedS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42241
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42242
has lithology component: BEDS SANDU
has source info: BEDS_49334
has source info: BEDS_50798
has source info: BEDS_51584
has source info: BEDS_52347
broader: LGS
has lower boundary definition: Upward change from usually clay-free glauconitic sand (Child Okeford Sands) to very clayey, fine-grained sand.
has geographical distribution: Patchy distribution across the south-western part of the Shaftesbury sheet (313); more continuous outcrop between Child Okeford (ST830 130) to (ST860 180).
has lithology description: Very clayey, fine-grained, glauconitic sand.
has thickness description: 0-5 metres.
has upper boundary definition: Usually capped by a thin pebble bed that marks the basal bed of the Gault. Where the pebble bed is absent, the boundary is drawn at the change from very clayey glauconitic sand, to glauconitic sandy clay.

Beefie Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: BEE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BEE COAL
broader: MCMS

Bee Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BEEC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Bee
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BEEC COAL
broader: NE

Beeston Chalk Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEECK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has lithology component: BEECK CHLK
has lithology component: BEECK FLNT
has source info: BEECK_49701
has source info: BEECK_50858
has source info: BEECK_51091
has source info: BEECK_51662
broader: NE
has additional age information: Together with the Catton Sponge Bed below, the beds cover most of the Belemnitella minor I Zone of Christensen (1995, 1999).
has lower boundary definition: The lower boundary placed at the surface above the Catton Sponge Bed.
has lithology description: The member comprises soft white chalk with irregular seams of large flints.
has thickness description: 75 feet [22.8m] estimated by Peake and Hancock,
has upper boundary definition: the upper boundary is poorly defined at a hardground on the coast at West Runton.

Beetle Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BEET
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: LC

Broadearth Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: BEFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Beeding Flints
type: Concept
in scheme: NamedRockUnit
alternative label: BEFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Beldin Gill Ganister
type: Concept
in scheme: NamedRockUnit
alternative label: BEG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CH
has predominant age: CH
has youngest age: CH
has obsolete equivalent: BEG mn 376
broader: SAML

Beggar Coal (Midlothian)
type: Concept
in scheme: NamedRockUnit
alternative label: BEGG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BEGG COAL
broader: LSC

Birnie Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42243
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42244
has lithology component: BEGR GRAV
has lithology component: BEGR SANDU
has lithology component: BEGR SILT
has source info: BEGR_50227
has source info: BEGR_52387
has obsolete equivalent: BEGR mn 641
broader: East Grampian (Albion) Glacigenic Subgroup
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Burn of Benholm (Type Area) and local developments. Kincardine coast between Inverbervie and Gourdon.
has lithology description: Matrix-rich red-brown clayey gravel containing cobbles of schistose semipelite, quartzite, psammite, sandstone and some chalk flints locally.
has thickness description: To 3m
has upper boundary definition: Tectonic or unconformable contact with Mill of Forest Till Formation or Benholm Clay Formation.

Bedminster Great Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BEGT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BEGT COAL
broader: SWMCM

Belton Grain Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BEGV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42245
has source info: BEGV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Beeding Hardgrounds
type: Concept
in scheme: NamedRockUnit
alternative label: BEHG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Bembridge Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GI
has predominant age: GI
has youngest age: GI
has lithology component: BEL LMST
has lithology component: BEL MDST
has obsolete equivalent: BEL mn 386
broader: Bembridge Beds
has geographical distribution: Isle of Wight and Creechbarrow (Dorset).

Bellochantuy Bay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BELB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BELB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42247
has lithology component: BELB BREC
has lithology component: BELB CALSST
has lithology component: BELB SDST
has source info: BELB_49618
has source info: BELB_51174
has source info: BELB_52127
has obsolete equivalent: BELB UORS
broader: STEW
has lower boundary definition: Unconformably overlies Dalradian metasedimentary rocks.
has geographical distribution: Coastal exposures on the west coast of the Kintyre peninsula, Argyll, Scotland.
has lithology description: Bright red friable sandstone, with thin layers composed of well-rounded and polished grains of quartz, interbedded with beds of breccia. Clasts within the breccia are of vein quartz, quartzite and mica-schist. The sandstone may contain facetted pebbles [of dreikanter type]. Cross-bedding [false-bedding] is a conspicuous feature of the sandstone, which is interpreted as an aeolian sand-dune deposit. Greyish-white sandstone with a calcareous cement is noted at Muasdale [NR675 395].
has thickness description: The proven minimum thickness of the formation exposed in the roadside cliff at Bellochantuy is 6m [18ft] [Pringle, 1952]. However, this is considered only to be the edge of strata that extend under the sea and are continuous with other exposures of the Formation along the Kintyre coast [Pringle, 1952].
has upper boundary definition: Overlying rocks no longer preserved.

Bellside Coal (Glasgow; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BELC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BELC COAL
broader: LCMS

Beinn Leamhain Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BELE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BELE PEL
has lithology component: BELE PSAMM
has lithology component: BELE QZITE
broader: LEIL

Belfast Group
type: Concept
in scheme: NamedRockUnit
alternative label: BELF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE
narrower: MGL
narrower: Ballytrea Formation
narrower: Gallagh Bridge Formation

Bellside Ironstone (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BELI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BELI FEST
broader: LCMS

Bellingham Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BELL
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BELL COAL
has lateral equivalent: BELL st 169
broader: SCG
has thickness description: c.0.6m

Barness East Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BELS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bedminster Little Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BELT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BELT COAL
broader: SWMCM

Beoch Musselband
type: Concept
in scheme: NamedRockUnit
alternative label: BEM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Beeding Marl
type: Concept
in scheme: NamedRockUnit
alternative label: BEMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Bettws Mill Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEMI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
broader: Camnant Mudstone Formation

Bensham Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BEN
has current status: CURRENT
has theme: BEDRCK
notation: Bent
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BEN COAL
has lateral equivalent: BEN st 393
has lateral equivalent: BEN QCO
broader: PMCM

Bencroy Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BENC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: NE
has geographical distribution: Slieve Anierin

Bees Nest Member
type: Concept
in scheme: NamedRockUnit
alternative label: BENE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: N1
has predominant age: N1
has youngest age: N1
has lithology component: BENE CLAY
has lithology component: BENE SILT
broader: Brassington Formation
has geographical distribution: Confined to scattered pockets on the Carboniferous Limestone outcrop of the Peak District, from north of Ramshorn [SK 088 463] to south of Monyash [SK 134 635].
has lithology description: Red, green and yellow silt and clay.

Ben Nevis Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BENEV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BENEV GD
has lithology component: BENEV PXDI
has lithology component: BENEV QDI
broader: Argyll And Northern Highlands Granitic Suite
narrower: Ben Nevis Complex (Inner Granite)
narrower: Ben Nevis Complex (Outer Granite)
narrower: Ben Nevis Complex (Marginal Intrusion) (Pyroxene Diorite To Granodiorite)
narrower: Ben Nevis Complex (Marginal Intrusion) (Quartz Diorite)

Benigarth Mica-Schist [?Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BENI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: AP
has lithology component: BENI SEMPEL
broader: Eastern Gneisses

Beinn Na Leac Member
type: Concept
in scheme: NamedRockUnit
alternative label: BENL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42248
has lithology component: BENL CALSST
has lithology component: BENL MDST
has lithology component: BENL SLST
has source info: BENL_49488
has source info: BENL_49569
has source info: BENL_50053
broader: Bearreraig Sandstone Formation
has lower boundary definition: First limestone bed above Dun Caan Shale Member.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Soft silty sandstones, harder calcareous sandstones becoming coarser upwards over the first 10m or so. The topmost part of the unit is thickly-bedded to massive sandstone with silty partings. Poorly fossiliferous, with rare bivalves, belemnites and ammonites.
has thickness description: 21m
has upper boundary definition: Overlain by cross-bedded sandstone of the Rasasay Sandstone Member.

Ben More Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BENM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has obsolete equivalent: BENM mn 3193
broader: MULL

Bennachie Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BENN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Cairngorm Granitic Suite

Ben Nevis Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: BENND
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: BENND FELS
has lithology component: BENND LMPY
has lithology component: BENND MCDI
has lithology component: BENND MCDIP
broader: SDCAD

Benscliffe Breccia Member [Superfluous Entry: Use Cmba]
type: Concept
in scheme: NamedRockUnit
alternative label: BENS
has current status: CURRENT
has theme: BEDRCK
notation: Ben
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42249
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42250
has lithology component: BENS DA
has lithology component: BENS LPTUF
has lithology component: BENS TFAMST
has lithology component: BENS TFSLST
has lithology component: BENS VCBR
has source info: BENS_50900
has source info: BENS_50921
has source info: BENS_51833
has source info: BENS_52376
has obsolete equivalent: BENS mn 402
has obsolete equivalent: BENS mn 1530
broader: Charnwood Lodge Volcanic Formation
has lower boundary definition: Not exposed; rests on fine-grained beds of Blackbrook Reservoir Formation, latter greenish-grey and commonly well-laminated.
has geographical distribution: Discontinuously exposed from Nanpantan (Rhododendron Hill) south to Benscliffe Wood, then north to Flat Hill. Possibly merges with Kite Hill Tuff north of latter.
has lithology description: Massive to thickly bedded sequence of dacitic volcanic breccia, lapilli tuffs and tuffaceous mudstones/siltstones.
has thickness description: c.21m in east, possibly over 100m in west.
has upper boundary definition: Overlain by Beacon Tuff Member in east, and by Charnwood Lodge Volcanic Formation (undivided beds) in west.

Bentinck Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BENT
has current status: CURRENT
has theme: BEDRCK
notation: Bent
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BENT COAL
has lateral equivalent: BENT st 344
has lateral equivalent: BENT st 672
has lateral equivalent: BENT st 842
broader: PMCM

Ben Vuirich Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BENVU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BENVU MIR
broader: PCGRA

Beoil Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEOQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BeoQ
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42251
has lithology component: BEOQ PEL
has lithology component: BEOQ PSAMM
has lithology component: BEOQ QZITE
has lithology component: BEOQ SEMPEL
has source info: BEOQ_50001
has source info: BEOQ_50024
has source info: BEOQ_51142
has source info: BEOQ_51764
has obsolete equivalent: BEOQ mn 407
broader: Lochaber Subgroup
has lower boundary definition: Gradational boundary with Dunalastair Semipelite Formation; boundary taken at base of first quartzite rib.
has geographical distribution: Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically in attenuated form as far west as Allt Druidhe [NN 6423 5693] and as far east as the Allt Kynachan [NN 7775 5723]. Not present east of the Loch Tay Fault, where it may have been tectonically excised;however some of the rocks of the 'Banvie Burn Series' may be equivalent.
has lithology description: Pelitic, semipelitic and psammitic rocks containing numerous characteristic ribs of pure white quartzite. Locally contains carbonate or graphite.
has thickness description: 0 - 30m; probably much tectonic thinning.
has upper boundary definition: Transitional boundary with Beoil Schist Formation; boundary taken at top of last quartzite rib.

Beoil Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEOS
has current status: CURRENT
has theme: BEDRCK
notation: BeoS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42252
has lithology component: BEOS PEL
has lithology component: BEOS PSAMM
has lithology component: BEOS QZITE
has lithology component: BEOS SCH
has source info: BEOS_50024
has source info: BEOS_50026
has source info: BEOS_51142
has source info: BEOS_51764
has obsolete equivalent: BEOS mn 408
broader: Lochaber Subgroup
has lower boundary definition: Transitional boundary with Beoil Quartzite Formation; boundary taken at top of last quartzite rib.
has geographical distribution: Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically as far west as Allt Druidhe [NN 642 5712] and as far east as the Tomintianda Burn [NN 809 606]. Not present east of the Loch Tay Fault, where it is tectonically excised; however some of the rocks of the 'Banvie Burn Series' may be equivalent.
has lithology description: Schistose muscovite-rich pelite with a scattered garnet porphyroblasts and pods of vein quartz. Unusually mica-rich. Locally contains sporadic carbonate or graphite.
has thickness description: 5 - 90m ; probably much tectonic thinning.
has upper boundary definition: Apparently transitional boundary with Meall Dubh Striped Pelite; highly tectonised.

Beldorney Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BEPE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42253
has lithology component: BEPE PEL
has lithology component: BEPE PSAMG
has lithology component: BEPE PSAMGF
has lithology component: BEPE PSAMI
has lithology component: BEPE PSAMM
has lithology component: BEPE QZITE
has lithology component: BEPE SEMPEL
broader: Argyll Group
has lower boundary definition: Sheared-out at western limit of Portsoy Shear-zone.
has geographical distribution: Cachnamuin Stripe, Bridgend (85E) to Bogforth, Cairnborrow (86W).
has lithology description: Pelite and semipelite, phyllitic and schistose, rarely slaty, commonly biotite-rich. Minor beds of psammite and quartzite. Thicker beds of gritty psammite.
has thickness description: Approximately 1250m maximum (based on maximum outcrop width and average dip).
has upper boundary definition: Faulted-out, sheared-out or cut by mafic and ultramafic major intrusions and pods at eastern limit of the Portsoy Shear-zone.

Bellyhack Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BEQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42254
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42255
has lithology component: BEQU QZITE
broader: Cullen Quartzite Formation
has lower boundary definition: Base of massive quartzite, not exposed.
has geographical distribution: Core of Ardonald Anticline on Jock's Hill, Dufftown and from Clunymore to Hill of Bellyhack.
has lithology description: Quartzite, pinkish white, massive.
has thickness description: Over 200m.
has upper boundary definition: Top of massive quartzite where overlain by flaggy micaceous psammites and semipelites of the Findlater Flag Formation.

Berllan Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BER
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has source info: BER_52509
has obsolete equivalent: BER mn 411
has obsolete equivalent: BER BER
is obsolete equivalent of: BER BER
broader: Denbigh Grits Formation

Benhar Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BERC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BERC COAL
broader: LCMS

Beeston Regis Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BERE
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QB
has predominant age: QB
has youngest age: QB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42256
has lithology component: BERE CLAY
has lithology component: BERE DIAMIT
has lithology component: BERE SANDU
has source info: BERE_48974
has source info: BERE_50918
has source info: BERE_52758
has source info: BERE_53005
has source info: BERE_53031
has obsolete equivalent: BERE mn 3078
broader: NP
narrower: TRIM
has lower boundary definition: Rests upon the Lowestoft Formation.
has geographical distribution: North-east Norfolk, possibly extending into north-east Suffolk.
has lithology description: Diamicton, comprising massive silty clayey sand with scattered pebbles of flint, sandstone, etc. containing rafts of chalk and bodies of "marly drift" (reconstituted chalk), interbedded with sands and laminated clays. (Age OIS 10 or 12).
has thickness description: About 50m thick.
has upper boundary definition: Overlain by the Overstrand Formation.

Beragh Granite
type: Concept
in scheme: NamedRockUnit
alternative label: BERG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Ben Rinnes Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BERI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: SSCGR
narrower: Ben Rinnes Pluton (Phase 1)
narrower: Ben Rinnes Pluton (Phase 2)
narrower: Ben Rinnes Pluton (Phase 3)
narrower: Ben Rinnes Pluton (Phase 4)

Ben Rinnes Pluton (Phase 1)
type: Concept
in scheme: NamedRockUnit
alternative label: BERI1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Ben Rinnes Pluton

Ben Rinnes Pluton (Phase 2)
type: Concept
in scheme: NamedRockUnit
alternative label: BERI2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Ben Rinnes Pluton

Ben Rinnes Pluton (Phase 3)
type: Concept
in scheme: NamedRockUnit
alternative label: BERI3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Ben Rinnes Pluton

Ben Rinnes Pluton (Phase 4)
type: Concept
in scheme: NamedRockUnit
alternative label: BERI4
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Ben Rinnes Pluton

Blackstone Edge Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BES
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42257
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42258
has lithology component: BES FEST
has lithology component: BES MDST
has lithology component: BES SDST
has source info: BES_49236
has source info: BES_50773
has obsolete equivalent: BES mn 222
broader: MORRI
has lower boundary definition: The lower boundary is taken at the base of the first protoquartzitic sandstone-dominated unit above black fissile mudstone that includes a Hodsonites magistrorum Marine Band.
has geographical distribution: West Derbyshire - north-east Staffordshire. Revidge [SK075 598] - Blackbank [SK032 666].
has lithology description: Sandstone, protoquartzitic, in sharp-based medium-bedded units with some preserved sole marks on the bases of units, and mudstone with ironstone beds and nodules. Soft sediment deformation structures common in places.
has thickness description: 30m
has upper boundary definition: The upper boundary is taken at the base of mudstone-dominated succession overlying the Blackstone Edge Sandstone, below black fissile mudstone that includes a Reticuloceras reticulatum Marine Band.

Brodie Sandstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: BESA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: HORD

Ben Eagach Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BESC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42259
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42260
has lithology component: BESC MCONG
has lithology component: BESC PEGP
has lithology component: BESC PELGP
has lithology component: BESC QZITE
has lithology component: BESC SCHGR
has source info: BESC_49440
has source info: BESC_51786
has source info: BESC_52396
has obsolete equivalent: BESC mn 388
broader: Easdale Subgroup
has lower boundary definition: Base of dominantly graphitic succession above the dominantly semipelitic Killiecrankie Schist in Perthshire and the quartzitic Creag Leacach Quartzite Formation in the Glen Shee district.
has geographical distribution: North of Tyndrum eastwards to north of Loch Lyon and then from north of Schiehallion to east of Spittal of Glen Shee.
has lithology description: Black graphitic schist with fine-grained disseminated sulphides.
has thickness description: Not known
has upper boundary definition: Top of dominantly graphitic succession below dominantly calcareous succession of the overlying Ben Lawers Schist Formation.

Belton Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BESG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: BESG GRAV
has lithology component: BESG SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Betton Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BET
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bet
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: BET MDST
has lithology component: BET SLST
has source info: BET_52275
has source info: BET_52403
has obsolete equivalent: BET mn 415
has obsolete equivalent: BET mn 416
broader: NP
has lower boundary definition: Overlies Weston Flags Formation.
has geographical distribution: Not defined.
has lithology description: Grey shales and siltstones.
has thickness description: Not defined.
has upper boundary definition: Underlies Meadowtown Formation.

Bedminster Toad Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BETD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BETD COAL
broader: NE

Bettshanger L Coal (Kent)
type: Concept
in scheme: NamedRockUnit
alternative label: BETL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BETL COAL
broader: NE

Bedminster Top Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BETP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BETP COAL
broader: NE

Beatrice Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BETR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Fladen Group
narrower: Carr Member
narrower: LOSE

Beverkae Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BEV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BEV LMST
broader: PDB

Bewerley Shales
type: Concept
in scheme: NamedRockUnit
alternative label: BEW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Bude Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42261
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42262
has lithology component: BF FEST
has lithology component: BF MDST
has lithology component: BF SDST
has lithology component: BF SLST
has source info: BF_49280
has source info: BF_50621
has source info: BF_51383
has source info: BF_51438
has source info: BF_51644
has source info: BF_52501
has obsolete equivalent: BF mn 994
has obsolete equivalent: BF mn 2839
has obsolete equivalent: BF mn 669
has obsolete equivalent: BF mn 1841
has obsolete equivalent: BF mn 2941
broader: HOWY
narrower: HQS
narrower: TMCS
has lower boundary definition: On the north Cornwall and north Devon coast, the base is taken at the top of the Hartland Quay Shale, the uppermost of the named goniatite-bearing mudstones in the underlying Crackington Formation. Inland, where the Hartland Quay Shale cannot be mapped in pervasively folded terrain, as it is too thin, the base is taken at the incoming of softer, siltier thick-bedded sandstones of the Bude Formation above the dominantly thin- to medium-bedded sandstones and mudstones of the underlying Crackington Formation. In north Devon, south of Bideford, the base is taken at the sharp incoming of over 100m of grey mudstones and siltstones with two thin anthracitic coals (culm) above the cross-bedded thick-bedded Cornborough Sandstone that caps the top of the underlying Bideford Formation. Thick-bedded sandstone with internally massive beds typical of the Bude Formation, appear above these mudstones and siltstones.
has geographical distribution: Occupies large area in mid-Devon between the coast at Bude (SS 21 06) and the area west of Tiverton (SS 96 13).
has lithology description: Grey thick-bedded, somewhat argillaceous and silty sandstones, in laterally discontinuous internally massive beds 1-5m thick and commonly amalgamated into units up to 10m thick. When weathered the sandstones become buff and friable. Very thick beds of slumped and destratified strata are also present. Grey mudstones occur as interbeds up to 1m thick but locally packets of darker mudstone up to 20m thick with thin ironstone beds and bundles of thin sandstones are present, especially in the upper part of the Formation. Five named beds of black sulphurous "shales" with goniatite-bearing calcareous nodules occur within the Formation. Thin units of thin- to medium-bedded siltstones with Xithosurid trails are also present.
has thickness description: 1290m+ calculated on the north Cornwall and north Devon coast.
has upper boundary definition: The upper boundary is taken at an angular unconformity, where breccias of the Exeter Group rest upon sandstone and subordinate mudstone of the Bude Formation.

Birker Fell Andesite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BFA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BFA
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42263
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42264
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42265
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42266
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42267
has lithology component: BFA AND
has lithology component: BFA BA
has lithology component: BFA BAANDT
has lithology component: BFA DA
has lithology component: BFA HY
has lithology component: BFA LPTUF
has lithology component: BFA PYRBRC
has lithology component: BFA TUF
has lithology component: BFA VCBR
has lithology component: BFA VCCNG
has lithology component: BFA VCSST
has source info: BFA_49013
has source info: BFA_50109
has source info: BFA_50153
has source info: BFA_50725
has source info: BFA_50981
has source info: BFA_51563
has source info: BFA_51742
has source info: BFA_51921
has source info: BFA_52012
has source info: BFA_52404
has source info: BFA_52834
has source info: BFA_52839
has source info: BFA_53059
has obsolete equivalent: BFA mn 88
has obsolete equivalent: BFA mn 436
has obsolete equivalent: BFA mn 2510
has obsolete equivalent: BFA mn 4300
broader: Borrowdale Volcanic Group
narrower: Ashness Tuff Member
narrower: NCT
narrower: Devoke Water Tuff Member
narrower: Eagle Crag Sandstone Member
narrower: Frith Crag Breccia Member
narrower: Great Whinscale Dacite Member
narrower: Grey Friar Tuff Member
narrower: Haystacks Andesite Member
narrower: WGTB
narrower: LIT
narrower: LMEL
narrower: Blisco Sandstone Member
narrower: LTY
narrower: STAD
narrower: TGH
narrower: Craghouse Tuff Member
narrower: Cockley Beck Tuff Member
narrower: RND
narrower: Dale Head Breccia Member
narrower: TNM
narrower: Birkby Fell Andesite Member
narrower: Grange Crags Andesite Member
has lower boundary definition: Taken at base of andesite succession unconformably overlying Skiddaw Group over most of the outcrop, except where andesites overlie bedded sandstones of the Letterbarrow Sandstone Formation in the west of the outcrop.
has geographical distribution: Stoneside Hill, west of Black Combe; Wasdale, Eskdale, Hard Knott, Harter Fell, and Devoke Water; Eskdale area, Borrowdale, Thirlmere, Matterdale Common, Gawbarrow, southeast of Ullswater, Haweswater and Swindale, Cumbria.
has lithology description: Predominantly a tabular sheeted succession of feldspar-phyric andesite lava flows, usually with blocky autobreccia at the top and base, and subordinate sills; includes some basalts, dacites and subordinate volcaniclastic deposits. Distinctive units are given Member status.
has thickness description: To c. 2.7km.
has upper boundary definition: Overlain by Whorneyside Formation; change to andesitic lapilli tuff.

Broadford Beds Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BFB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BfB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42268
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42269
has lithology component: BFB CALSIR
has lithology component: BFB FEST
has lithology component: BFB HFMDST
has lithology component: BFB HFSDST
has lithology component: BFB LMST
has lithology component: BFB MDST
has lithology component: BFB SDST
has lithology component: BFB SLST
has source info: BFB_49056
has source info: BFB_49488
has source info: BFB_49569
has source info: BFB_50053
has source info: BFB_52629
has source info: BFB_52637
has obsolete equivalent: BFB mn 2520
has obsolete equivalent: BFB mn 4337
broader: LI
has additional age information: Hettangian To Lower? Simemurian
has lower boundary definition: Transitional, transgressive mudstones and sandstones from underlying Triassic.
has geographical distribution: Sea of Hebrides Basin.
has lithology description: The Broadford Beds Formation is fully described by Morton and Hudson, 1995, though Hesselbo et al, (1998) contradict this and rename the units described. BGS maps are based on the former reference. The description includes BHLS, BRKH and ADS, which are also documented in the Lexicon. The lower Broadford Beds are dominated by carbonate rocks, calcareous mudstones and mature sandstones. Coral-rich beds are abundant in the lowermost parts and are overlain by restricted marine-fauna-rich lagoonal sediments. A shallowing of marine conditions from neritic deposition during Blue Lias times to nearshore/lagoonal is inferred. The upper Broadford Beds comprise sandstones and sandy siltstones. Typically these are highly micaceous and ferriginous. An ironstone bed with chamosite is found on the Ardnish Peninsula. A diverse marine faunal assemblage is common.
has thickness description: 50 to 100m
has upper boundary definition: Abrupt facies change to Pabay Shale Formation.

Bude Formation And Bideford Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BFBF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
has lithology component: BFBF AROC
has lithology component: BFBF MDST
has lithology component: BFBF SDST
has lithology component: BFBF SLST
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Big Flint Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: BFCC
has current status: CURRENT
has theme: BEDRCK
notation: BF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BFCC COAL
broader: PMCM

Bracklinn Falls Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BFCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BFC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42271
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42270
has lithology component: BFCO CONG
has lithology component: BFCO PESST
has lithology component: BFCO SDST
has source info: BFCO_51673
has source info: BFCO_52200
has lateral equivalent: BFCO UBCO
broader: THF
has lower boundary definition: A diachronous, transitional contact with the typical sandstone facies of the undivided Teith Sandstone Formation.
has geographical distribution: North-west limb of Strathmore Syncline between Lake of Menteith and Glen Artney.
has lithology description: Conglomerate with quartz clasts, interbedded with pebbly sandstones.
has thickness description: Variable, 150 m at Bracklinn Falls, 350 m at Craig of Port [NN 581 022], but not found south-west of Lake of Menteith, although it may correlate with a 2 m thick quartz conglomerate in Green Burn [NS 5115 9519].
has upper boundary definition: Sharp, diachronous contact with sandstone and mudstone facies of the undivided Teith Sandstone Formation.

Bifidus Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BFDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: BFDS CONG
has lithology component: BFDS MDST
has lithology component: BFDS SLST
has lithology component: BFDS TUF
has source info: BFDS_48824
has source info: BFDS_49828
has source info: BFDS_50784
has source info: BFDS_51180
has source info: BFDS_51272
has obsolete equivalent: BFDS mn 423
has obsolete equivalent: BFDS mn 420
broader: Aran Volcanic Group
narrower: TYM
has lower boundary definition: Marked by rapid transition from massively bedded tuffs or tuffaceous sediments of the Beacon Hill Volcanic Formation.
has geographical distribution: Continuous outcrop from the coast to beyond Cadair Idris.
has lithology description: Mudstones with localised conglomerates, siltstones, tuffaceous debris flow deposits (Tal-y-Gareg Member).
has thickness description: 95m (Sheet SH50NE) to 200m (Cadair Idris - Cox, 1925, Quarterly Journal of the Geological Society of London, Vol.81.
has upper boundary definition: Marked by transition from bluish or olive green mudstones into nodular black mudstones (Fron Neurydd Formation).

Bankfield East Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BFEB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: BFEB LMST
has lithology component: BFEB MDST
broader: Chatburn Limestone Formation

Bideford Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BFF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42272
has lithology component: BFF MDST
has lithology component: BFF SDST
has lithology component: BFF SLST
has source info: BFF_49096
has source info: BFF_49279
has source info: BFF_49644
has source info: BFF_50395
has source info: BFF_51015
has source info: BFF_51884
has obsolete equivalent: BFF mn 28
has obsolete equivalent: BFF mn 419
has obsolete equivalent: BFF mn 3079
has obsolete equivalent: BFF mn 3080
has obsolete equivalent: BFF mn 29
has obsolete equivalent: BFF CKF
has obsolete equivalent: BFF mn 4591
broader: HOWY
narrower: WDHO
has lower boundary definition: The lower boundary is taken at the incoming of channels overlain by syndepositionally disturbed units and thick, locally cross-bedded sandstones of the Westward Ho! Member above the regularly interbedded mudstones and turbidite sandstones of the Crackington Formation. The boundary is not exposed at the type section and has never been mapped, as the Westward Ho! Member was previously included in the Crackington Formation. Further work is needed on this boundary.
has geographical distribution: Bideford area (SS 45 27) eastwards to 6km west of South Molton (SS 71 26), mid Devon.
has lithology description: Mudstones with abundant thin to medium-bedded sandstones and siltstones with several thick units of thick-bedded sandstone. The upper two thirds of the sequence consists of nine coarsening upwards cycles (individually up to 180m thick) comprising in upwards order, black mudstone, silty mudstone, silt and sand-streaked mudstones, interbedded thin sandstones and mudstones, thick-bedded channelised cross-bedded sandstones capped by burrowed horizons and locally rootlets. The lower parts of some cycles contain units of thin-bedded 'Bourma-type' sandstone turbidites. Three of the thick cross-bedded sandstones capping the cycles are named, the topmost one being the Cornborough Sandstone. The lower third of the sequence (Westward Ho! Member) is not cyclic but comprises thin-bedded mudstones, siltstones and sandstones, some of which are turbiditic and others cross laminated and wave rippled. The Westward Ho! Member includes several channels filled by slumped and disturbed strata or, more rarely, cross-bedded or cross laminated sandstones.
has thickness description: 1220m+ seen at the type section.
has upper boundary definition: The upper boundary is taken at the sharp incoming of over 100m of grey mudstones and siltstones with two thin anthracitic coals (culm) of the overlying Bude Formation above the thick cross-bedded Cornborough Sandstone that caps the topmost cycle of the Bideford Formation.

Bencliff Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: BFG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BfG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42273
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42274
has lithology component: BFG SAMDST
has lithology component: BFG SDST
has lithology component: BFG SLST
has source info: BFG_49630
has source info: BFG_50512
has source info: BFG_51010
has source info: BFG_51102
has source info: BFG_51849
has source info: BFG_52995
has obsolete equivalent: BFG mn 400
has obsolete equivalent: BFG mn 401
broader: RECF
has lower boundary definition: Base is a conformable passage with the underlying Nothe Clay Member, and marked by the upward gradational change from mudstone, becoming increasingly sandy upwards of the upper Nothe Clay, to fine-grained sandstone of the basal Bencliff Grit (Coe, 1995).
has geographical distribution: South Dorset.
has lithology description: Sandstone, fine-grained, and sandy siltstone, argillaceous, yellow and pale grey, medium- to very thick-bedded, with well developed swaley cross-stratification, planar and ripple lamination, and conspicuous erosional bases. In places these beds are intercalated with thin, discontinuous beds of sandy mudstone. The sandstones and siltstones locally contain large calcareous concretions (up to 1-2m in diameter), and the sandy mudstones are bioturbated with Diplocraterion. The sandstones are notably oil-impregnated.
has thickness description: Up to 7.5m
has upper boundary definition: A sharp, planar, bored erosion surface at the top of the Bencliff Grit marks the upward change from fine-grained sandstone to thin allaceous limestones and mudstones of the basal Osmington Oolite Formation.

Broadford Gabbro (Skye Eastern Red Hills Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: BFGA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BFGA GB
broader: REDHE

Bottom Fourth Waterloo Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BFHWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BFHWC COAL
broader: PMCM

Blue Flats Ironstone (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BFI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BFI FEST
broader: PLCM

Bowfell Links Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BFL
has current status: CURRENT
has theme: BEDRCK
notation: BfL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42275
has lithology component: BFL VCSLST
has lithology component: BFL VCSST
has source info: BFL_50725
has source info: BFL_52187
has obsolete equivalent: BFL mn 547
broader: SET
has lower boundary definition: Taken at the base of well bedded volcaniclastic rocks generally overlying the Pavey Ark Breccia Member, but in places overlapping the Scafell Dacite and volcaniclastic breccia of the Cam Crags Member
has geographical distribution: From Thirlmere to Scafell and the Langdale Pikes, Lake District, Cumbria
has lithology description: Planar thin-bedded to ripple-cross laminated volcaniclastic siltstone and fine-grained volcaniclastic sandstone; some intercalated coarse-grained volcaniclastic sandstone containing elongate pumice fragments.
has thickness description: Up to 120m
has upper boundary definition: Defined by the base of overlying volcaniclastic rocks of the Cockley Pike Member

Bishop's Frome Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BFLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BFL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42276
has lithology component: BFLS CLCRET
has lithology component: BFLS LMST
has source info: BFLS_50364
has obsolete equivalent: BFLS mn 3413
broader: RG
has lower boundary definition: Placed at base of thick mature calcrete, overlying red mudstones.
has geographical distribution: Hereford-Worcester-Tewkesbury districts, but may equate with 'Psammosteus' Limestone(s) present throughout Wales and the Welsh Borderland.
has lithology description: Rubbly, massive to nodular limestone-calcrete palaeosol horizons.
has thickness description: 2 - 5m, locally up to 8m.
has upper boundary definition: Placed at top of thick mature calcrete, above which sandstones of the overlying St.Maughans Formation appear.

Brushford Member
type: Concept
in scheme: NamedRockUnit
alternative label: BFM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
broader: NE

Didymograptus Bifidus Beds And Didymograptus Murchisoni Beds (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BFMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: BFMB AROC
has obsolete equivalent: BFMB mn 422
broader: NE
has lithology description: See the Lithology descriptions for the component units.

Brofiscin Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BFO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42277
has lithology component: BFO DOLO
has lithology component: BFO LMST
has source info: BFO_50514
has source info: BFO_52830
has obsolete equivalent: BFO mn 769
broader: Black Rock Limestone Subgroup
has lower boundary definition: The base of the Formation is taken at the sharp contact between the thin- to medium-bedded packstones of the underlying Barry Harbour Limestone Formation and the thick-bedded ooidal grainstones of the Brofiscin Oolite Formation. Along the southeast and east crop of the South Wales Coalfield the base is taken at the sharp junction between the dolomitized packstones of the Barry Harbour Limestone Formation and the overlying dolomitized oolite of the Brofiscin Oolite Formation.
has geographical distribution: Vale of Glamorgan [ST 00 74] and the south and east crops [ST 25 90] of the South Wales Coalfield, east of Swansea. Present in Gower [SS 50 90] but not mapped. Passes into the Clydach Valley Subgroup to the north.
has lithology description: Pale to purplish grey, thick-bedded to massive, cross-bedded, ooidal grainstone. On the southeast and east crop of the South Wales Coalfield the formation is dolomitized. Deposited as an ooid shoal.
has thickness description: 17m in the north of the Vale of Glamorgan, thinning southwards to a feather edge in the south of the Vale of Glamorgan.
has upper boundary definition: The top of the Formation is taken at the sharp junction of the ooidal grainstones of the Formation and the overlying thin- to medium-bedded skeletal packstones of the Friars Point Limestone Formation. Along the south and east crop of the South Wales Coalfield the top is taken at the sharp junction between the dolomitized oolite of the Formation and the very fine- to fine-grained dolomitized packstones of the Friars Point Limestone Formation.

Bottom Five Quarter Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BFQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BFQ COAL
broader: PMCM

Big Flint Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BFR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BFR SDST
broader: PMCM

Beechcliff Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BFS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
broader: NE

Bank Farm Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BFSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithogenesis: FLUV
has lithology component: BFSG GRAV
has lithology component: BFSG SANDU
has source info: BFSG_51340
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Brielle Ground Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: NO
has predominant age: NO
has youngest age: NO
has lithology component: BG CLAY
has lithology component: BG SANDU
has obsolete equivalent: BG mn 605
broader: NE
has lower boundary definition: Lower boundary is base pliocene.
has geographical distribution: Not defined.
has lithology description: Shelly marine glauconitic sands and clays.
has thickness description: Not defined.
has upper boundary definition: Upper boundary is top pliocene.

Balgaverie Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGA
has current status: CURRENT
has theme: BEDRCK
notation: BGA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OX
has predominant age: OX
has youngest age: OX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42278
has lithology component: BGA SDST
has source info: BGA_48694
has source info: BGA_50759
has source info: BGA_52760
broader: MYO
has additional age information: Late Ordovician, late(st) Caradoc (Streffordian), and linearis Zone (see Fortey and others, 2000, Column 78).
has lower boundary definition: Base of sandstone lithology overlying dominantly silty mudstones of the enclosing undifferentiated Myoch Formation.
has geographical distribution: The Girvan area of southwest Scotland.
has lithology description: A suite of fossiliferous channel-fill sandstones in the upper part of the (silty-)mudstone-dominated Myoch Formation, containing distinctive late Caradoc shelly fossils.
has thickness description: About 8m
has upper boundary definition: Taken at the top of the sandstone lithology beneath the overlying dominantly silty mudstones of the enclosing undifferentiated Myoch Formation.

Ballyagen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGAN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BGAN CLCRET
has lithology component: BGAN MDST
has lithology component: BGAN SDST
broader: Cross Slieve Group

Balbardie Gas Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BGAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BGAS COAL
broader: LSC

Bowhousebog Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: BGC COAL
broader: PGP
has additional age information: The precise Age is uncertain, but the bed lies within the limits of Arnsbergian to Langsettian.

Big Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BGCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BGCO COAL
has lateral equivalent: BGCO st 719
has lateral equivalent: BGCO st 760
broader: SWLCM
has supplementary information: See Generalized Vertical Section, SS59SE

Ben Griam Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGCON
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BGC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42279
has lithology component: BGCON CONG
has lithology component: BGCON SDST
has source info: BGCON_50659
has obsolete equivalent: BGCON mn 389
has obsolete equivalent: BGCON mn 390
has obsolete equivalent: BGCON mn 391
has obsolete equivalent: BGCON mn 392
broader: OA
has lower boundary definition: Unconformable on Moine metasedimentary rocks, which are mainly composed of migmatitic pelite and semipelite of the Loch Coire Formation, together with granitic sheets known as the Badenloch granite sheets, of the Caledonian Igneous Supersuite.
has geographical distribution: Mountain tops in the Ben Griam Mor and Ben Griam Beg area, Sutherland, about 28km northwest of Helmsdale.
has lithology description: Comprises a red conglomerate that contains clasts mainly of Moine Supergroup metasedimentary rocks and granite, and thin interbeds of sandstone.
has thickness description: About 250m
has upper boundary definition: Conformably overlain by sandstone of the undifferentiated Ousdale Arkose Formation.

Blengdale Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bgd
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42281
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42280
has lithology component: BGD BREC
has lithology component: BGD PSPYR
broader: Borrowdale Volcanic Group
has lower boundary definition: Not exposed, but taken at the base of the parataxitic silicic tuff resting on dominantly lithic-rich lithic-tuff of the Lowcray Formation.
has geographical distribution: Main exposures in Blengdale Forest to Ponsonby Fell, near Gosforth, Cumbria.
has lithology description: Rheomorphic, parataxitic tuff, rhyolitic in composition and locally autobrecciated. At top coarse breccia largely composed of clasts of tuff.
has thickness description: Estimated minimum preserved thickness c.250m
has upper boundary definition: Not exposed, removed by recent erosion (overlain unconformably by Permian strata).

Bryn-Glas Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has lithology component: BGF MDST
has lithology component: BGF SDST
has lithology component: BGF SLST
has source info: BGF_50678
has source info: BGF_51529
has obsolete equivalent: BGF mn 650
has obsolete equivalent: BGF mn 651
broader: NA
narrower: LLUE
has lower boundary definition: Overlies the Pencerrigtewion Member of the Drosgol Formation (Cave and Hains, 1986), with apparent conformity, although the boundary is likely to represent one or more syndepositional slide planes. Where the Pencerrigtewion Member disappears, the Formation cannot be distinguished from the underlying Drosgol Formation, and both have been grouped as the Garnedd-wen Formation.
has geographical distribution: Not specified.
has lithology description: Mid to dark grey massive mudstones, commonly slumped and destratified, with rafts and balled inclusions of sandstone; local thin-bedded siltstones.
has thickness description: 30 to 195m
has upper boundary definition: Conformably overlain by the anoxic hemipelagic mudstones of the Cwmere Formation.

Bron Y Graig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BGG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42282
has lithology component: BGG MDST
has lithology component: BGG SDST
has lithology component: BGG SLST
has source info: BGG_51836
broader: NA
has lower boundary definition: Base unconformable on Ashgill sediments e.g. Maerdy Mudstone Formation.
has geographical distribution: Not defined.
has lithology description: Dark grey mudstones and yellow to light grey laminated siltstones, fine-grained grey to yellow sandstones, which are massive, graded or parallel and/or ripple laminated. Sporadic graptolites.
has thickness description: To 500m
has upper boundary definition: Top succeeded by pale grey siltstones of the Bettws Mudstone Formation.

Beinn A'Ghlo Transition Formation And Glen Clunie Graphitic Schist Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BGGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BGGC MLMST
has lithology component: BGGC PEL
has lithology component: BGGC PSAMM
has lithology component: BGGC QZITE
has lithology component: BGGC SEMPEL
broader: Ballachulish Subgroup
has lithology description: See the Lithology descriptions for the component formations.

Beenham Grange Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42283
has lithogenesis: FLUV
has lithology component: BGGR CLAY
has lithology component: BGGR GRAV
has lithology component: BGGR SANDU
has source info: BGGR_51121
has source info: BGGR_52263
has source info: BGGR_52831
has obsolete equivalent: BGGR mn 367
has obsolete equivalent: BGGR VLGR
broader: KNTV
narrower: Lower Beenham Grange Gravel
narrower: Upper Beenham Grange Gravel
has lower boundary definition: Sharp erosional base on Cretaceous-Tertiary bedrock.
has geographical distribution: Kennet Valley.
has lithology description: Gravel, variably sandy and clayey.
has thickness description: Commonly 1-6m, locally 10m
has upper boundary definition: Terrace surface modified by erosion: underlies Beenham Grange Terrace 1 - 3m above Kennet Floodplain.

Lower Beenham Grange Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BGGRL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: BGGRL S
has lithology component: BGGRL V
broader: Beenham Grange Gravel Member
has lithology description: Subdivision of Beenham Grange Gravel based on morphology, by break-of-slope only.

Upper Beenham Grange Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BGGRU
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: BGGRU CZ
has lithology component: BGGRU S
has lithology component: BGGRU V
broader: Beenham Grange Gravel Member
has lithology description: Subdivision of Beenham Grange Gravel based on morphology, by break-of-slope only.

Benglog Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42284
has lithology component: BGL FTUFF
has lithology component: BGL MDST
has lithology component: BGL MFLAVA
has lithology component: BGL SLST
has lithology component: BGL TUFCY
has source info: BGL_48777
has source info: BGL_50526
has source info: BGL_51180
has lateral equivalent: BGL st 645
has obsolete equivalent: BGL st 83
has lateral equivalent: BGL st 746
broader: Aran Volcanic Group
has additional age information: Llanvirn to Early Caradoc.
has lower boundary definition: Overlies mudstones and siltstones of the Ty'r Gawen Mudstone Formation, though with possible unconformity or non-sequence in places. Northwards from the Cadair Idris district it oversteps the Melau Formation to rest on the Allt Lwyd Formation in the Harlech district.
has geographical distribution: Not yet specified.
has lithology description: Thick- to thin-bedded intermediate to mafic crystal tuffs and rare felsic tuffs, interbedded with pillowed lavas, hyaloclastites, and tuffaceous siltstones and mudstones.
has thickness description: To 250m
has upper boundary definition: Conformably overlain by mudstones of the Ty'r Gawen Mudstone Formation in the Cadair Idris district, where it also passes laterally into the Pen y Gadair Volcanic Formation. In the northeastern part of this district it is overlain by the felsic tuffs of the Craig Cau Formation, with possible disconformity.

Baligill Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42285
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42286
has lithology component: BGLM BMDST
has lithology component: BGLM LMST
has lithology component: BGLM SDST
has lithology component: BGLM SLST
has source info: BGLM_52700
broader: Bighouse Formation
has lower boundary definition: The lowest of the sequence of 3 thick [>1m] carbonate laminate [limestones] developed in the Bighouse Formation.
has geographical distribution: Onshore and immediately offshore of the Dounreay area, Caithness, Northern Scotland.
has lithology description: Laminated and bituminous microsparitic limestone interbedded with medium-grained sandstone and bituminous siltstone and mudstone.
has thickness description: 30m
has upper boundary definition: The uppermost of the sequence of 3 thick [>1m] carbonate laminates [limestones] developed in the Bighouse Formation.

Bonds Glen Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BGLS MLMST
broader: Claudy Formation

Ballagan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BGN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42287
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42288
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42290
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42291
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42292
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42293
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42295
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42294
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42289
has lithology component: BGN ANHY
has lithology component: BGN ARLMST
has lithology component: BGN BATUF
has lithology component: BGN CAMDST
has lithology component: BGN COAL
has lithology component: BGN CONG
has lithology component: BGN DOLMST
has lithology component: BGN DOLO
has lithology component: BGN GYPST
has lithology component: BGN LMST
has lithology component: BGN MDST
has lithology component: BGN SDST
has lithology component: BGN SLST
has source info: BGN_48773
has source info: BGN_49454
has source info: BGN_50716
has obsolete equivalent: BGN st 176
has obsolete equivalent: BGN mn 218
has obsolete equivalent: BGN TYN
broader: INV
narrower: Drumwhirn Member
narrower: ORR
narrower: WLH
narrower: KICM
narrower: LSBU
narrower: Carham Limestone Bed
has lower boundary definition: Not seen in type section; elsewhere transitional on cornstone-bearing sandstones of Kinnesswood Formation (as at a depth of 224.8m in British Geological Survey East Dron Borehole (NO11NW/24; NO1360 1572)).
has geographical distribution: Not defined.
has lithology description: Grey mudstones and siltstones, with nodules and beds of ferroan dolomite (cementstones), the beds generally less than 0.3m thick. Gypsum and, to a much lesser extent, anhydrite and pseudomorphs after halite occur. Desiccation cracks are common and the rocks commonly show evidence of brecciation during diagenesis. Both these features are associated with reddening of the strata. Where present, the restricted fauna is characterised by the bivalve Modiolus latus, but ostracods are more abundant. Thin sandstones are present in many areas, and thick localised sandstones are also now included in the formation.
has thickness description: About 900m (maximum) in the West Lothian area, and up to 250m in the Northern England Province.
has upper boundary definition: The top is drawn at the top of the highest unit of mudstone and cementstone in any particular area. The Clyde Sandstone Formation usually overlies the Formation.

Bangor Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGOR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42296
has lithology component: BGOR CONG
has lithology component: BGOR MDST
has lithology component: BGOR SDST
has lithology component: BGOR SLST
has source info: BGOR_49929
has source info: BGOR_49974
has source info: BGOR_50354
has source info: BGOR_50644
has source info: BGOR_50698
has source info: BGOR_51944
broader: Arfon Group
has additional age information: Early Cambrian.
has lower boundary definition: Taken at the angular unconformity that separates the formation from the underlying volcaniclastic rocks of the Minfordd Formation.
has geographical distribution: In the immediate vicinity of Bangor, North Wales.
has lithology description: Volcanogenic sandstone and conglomerate, overlain by laminated fine-grained acid tuffites, including tuffaceous sandstone, siltstone and mudstone.
has thickness description: Up to 240 m thick.
has upper boundary definition: Taken at the conformable transition into the purplish red siltstones of the Llanberis Slates Formation.

Bagshot Pebble Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BGP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: NE

Bwlch Groes Porphyritic Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: BGPM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: BGPM MCGNP
has source info: BGPM_50909
broader: Carn Fadryn Suite
has lower boundary definition: Not applicable.
has lithology description: Porphyritic microgranite.
has thickness description: Unknown.
has upper boundary definition: Not applicable.

Bronllwyd Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BGr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42297
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42298
has lithology component: BGR CONG
has lithology component: BGR MDST
has lithology component: BGR SDST
has source info: BGR_49974
broader: NP
has additional age information: Uncertain, within range Comley?Merioneth.
has lower boundary definition: Sharply defined but generally conformable base of coarse conglomeratic sandstone overlying the mudstones of the Llanberis Slates Formation.
has geographical distribution: Northern Snowdonia, North Wales.
has lithology description: Comprises thick bits of coarse-grained green-grey massive sandstone, and interbedded mudstone, which is locally manganiferous, and local conglomerates.
has supplementary information: Formation not assigned to a group.
has thickness description: 500m
has upper boundary definition: Gradational into basal mudstones of the Marchlyn Formation.

Big Rock Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BGRK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: BGRK COAL
broader: NE

Bearing Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BGRT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has source info: BGRT_52720
broader: PENDL
has supplementary information: The term is retained informally within the local lower part of the Pendleton Formation, pending revision of the mapping in the Pateley Bridge area, where the unit was formerly recognized as the lower leaf of their Grassington Grit Formation by Brandon et al. (1995).

Biggar Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGRV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42299
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42300
has lithology component: BGRV AND
has lithology component: BGRV ANDLAV
has lithology component: BGRV BALAVA
has lithology component: BGRV CONG
has lithology component: BGRV RY
has lithology component: BGRV RYTUF
has lithology component: BGRV SDST
has lithology component: BGRV TR
has lithology component: BGRV TUF
has lithology component: BGRV VCBR
has source info: BGRV_51673
has obsolete equivalent: BGRV mn 2337
broader: LNK
has lower boundary definition: The base of the volcanic pile above the Swanshaw Sandstone Formation in the Biggar area.
has geographical distribution: Biggar area, South Lanarkshire, Scotland.
has lithology description: A volcanic succession of basalts, andesites, trachytes and rhyolites, including rhyolitic tuff and breccia with minor intercalations of sandstone and conglomerate.
has thickness description: At least 100 m thickness locally.
has upper boundary definition: The base of the overlying Auchtitench Sandstone Formation in the Biggar area.

Bagshot Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BgB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42301
has lithology component: BGS CLAY
has lithology component: BGS GRAV
has lithology component: BGS SANDU
has lithology component: BGS SDST
has source info: BGS_49296
has source info: BGS_49854
has source info: BGS_49855
has source info: BGS_51647
has source info: BGS_51792
has source info: BGS_52381
has source info: BGS_52471
has source info: BGS_52693
has source info: BGS_52964
has obsolete equivalent: BGS mn 204
has obsolete equivalent: BGS mn 205
broader: NP
has lower boundary definition: Drawn at base of thick, pale, fine-grained sands of the Bagshot Formation where it rests on silt and fine-grained sand of the Claygate Member (London Clay Formation).
has geographical distribution: London Basin.
has lithology description: Fine, white, buff and sometimes crimson sands, grey when unweathered, with sporadic seams of pale pipe-clay and local beds of flint-pebble gravel.
has thickness description: To c.120m south west of London; generally less than 30m
has upper boundary definition: Generally eroded off. The formation includes the "Bracklesham Beds" and "Barton Beds" to the southwest of London.

Blackshale/Ashgate Group (Of Coals) (Nottingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BGSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BGSC COAL
broader: NE

Baginton Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42302
has lithology component: BGSG C
has lithology component: BGSG P
has lithology component: BGSG S
has lithology component: BGSG V
has lithology component: BGSG Z
has source info: BGSG_49363
has source info: BGSG_49385
has source info: BGSG_50812
has source info: BGSG_51827
has source info: BGSG_52088
has source info: BGSG_52215
has obsolete equivalent: BGSG mn 201
has obsolete equivalent: BGSG mn 202
has obsolete equivalent: BGSG mn 203
broader: Bytham Catchments Subgroup
has additional age information: Early Pleistocene to Mid Pleistocene.
has lower boundary definition: Unconformable on pre-Quaternary bedrock.
has geographical distribution: The valley of the Proto-Soar River around Coventry, extending as far west as Snitterfield near Stratford-on-Avon. Eastwards it extends to Croft and Huncote (1:50 000 Sheets 155, 169) but does not extend onto Sheet 156.
has lithology description: The formation encompasses fluvial, lacustrine and organic deposits of the Proto-Soar River. The deposits are sands and gravels, with lenses of silt and clay. In the type area around Coventry, the formation includes gravels (the Baginton-Lillington Gravel of Shotton, 1953) overlain by sand (the Baginton Sand of Shotton, 1953). The gravels are up to 98% composed of grey and purple quartzite and vein quartz, largely of Triassic derivation, with a little Jurassic limestone, ironstone and robust fossils. The sands are fine- to medium-grained, clean and well-sorted. They are interpreted as the deposits of low-sinuosity braided rivers dominated by longtitudinal bars. They differ from the Bytham Sand and Gravel Formation by having a low proportion of Jurassic material.
has thickness description: c.16.5m
has upper boundary definition: Commonly overlain by Middle Pleistocene glacigenic deposits. Upper boundary may be difficult to determine where overlain by glaciofluvial sand and gravel, but the presence of more angular clasts, chalk, and poorer sorting in the latter is usually helpful.

Ballygomartin Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BGSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BGSI BA
has source info: BGSI_48990
broader: NP

Bogside Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BGSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: BGSL LMST
has source info: BGSL_51867
broader: Bewcastle Member
has geographical distribution: Locally developed in the Bewcastle district, Cumbria.
has supplementary information: The lowermost limestone in the Bewcastle Member in this area.

Bushley Green Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGT
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42303
has lithogenesis: FLUV
has lithology component: BGT GRAV
has lithology component: BGT SANDU
has lithology component: BGT SILT
has source info: BGT_49496
has source info: BGT_51403
has source info: BGT_51964
has source info: BGT_52153
has source info: BGT_52444
has obsolete equivalent: BGT mn 703
has obsolete equivalent: BGT mn 706
has obsolete equivalent: BGT mn 705
has obsolete equivalent: BGT mn 1552
broader: SEVN
has lower boundary definition: Where river deposits overlie bedrock or glacial deposits.
has geographical distribution: River Severn Basin Chepstow.
has lithology description: Gravel, mainly flints and Triassic-derived quartzites. Local basal fossiliferous silts and sands. Sand and gravel, with clay, silt and mammalian bones; Fifth Terrace of the Severn; part of the Severn Valley Formation - [Generic description: academic papers and BGS Memoirs].
has thickness description: Up to 9m
has upper boundary definition: The present day terrace surface.

Benarth Grits And Flags
type: Concept
in scheme: NamedRockUnit
alternative label: BGTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Bacton Green Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: BGTI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42304
has lithology component: BGTI C
has lithology component: BGTI DMTN
has lithology component: BGTI S
has lithology component: BGTI V
has lithology component: BGTI Z
has source info: BGTI_50107
has source info: BGTI_50764
has source info: BGTI_52145
has obsolete equivalent: BGTI mn 1143
has obsolete equivalent: BGTI mn 1145
has obsolete equivalent: BGTI mn 4166
has obsolete equivalent: BGTI mn 2973
broader: SMCL
has additional age information: Mid Pleistocene.
has lower boundary definition: The Bacton Green Till Member exhibits a gradational lower boundary with either the Mundesley Sand Member (outwash sands) or the Runton Till Member (subglacial till) of the Sheringham Cliffs Formation.
has geographical distribution: The Bacton Green Till Member crops out on the northeast Norfolk coast between Bacton Green and Sheringham.
has lithology description: The Bacton Green Till Member forms an extensive diamicton complex that consists of a stratified assemblage of stony diamicton with beds/laminae of sorted material including sand, silt and clay. It has been interpreted as being a subaqueous till deposited by melt-out and gravity flows (Lunkka, 1994; Lee et al., 2004). The calcium carbonate content of the matrix of the diamicton beds is typically within the region of 10-12% and is some 20% lower than tills from the underlying Lowestoft Formation.
has supplementary information: The diamicton within the unit is stratified.
has thickness description: Variable but generally in the range of 10-15m.
has upper boundary definition: Commonly the upper boundary of the Bacton Green Till Member is erosional - for example where it is overlain by the Weybourne Town Till and Runton Cliffs Sand and Gravel members of the Sheringham Cliffs Formation, and the Stow Hill Sand and Gravel of the Briton's Lane Formation. More rarely, in the Trimingham area, the till grades upwards into the Trimingham Sand and Trimingham Clay members.

Boat Of Garten Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BGTN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BGTN GNBP
broader: SSCGR
has lithology description: BIOTITE-GRANITE, PORPHYRITIC PLUS TONALITE, PORPHYRITIC TO GRANODIORITE, PORPHYRITIC

Beinn A'Ghlo Transition Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGTR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BGTR PEL
has lithology component: BGTR PELGP
has lithology component: BGTR PSAMM
has lithology component: BGTR QZITE
has lithology component: BGTR SEMPEL
has source info: BGTR_48864
has source info: BGTR_50001
has source info: BGTR_51786
broader: Ballachulish Subgroup

Black Rock Subgroup And Gully Oolite Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BGUO
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has lithology component: BGUO DOLMST
has lithology component: BGUO DOLO
has lithology component: BGUO LMST
broader: NA

Barnt Green Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BGV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BGV
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42305
has lithology component: BGV TFAMST
has lithology component: BGV TFASST
has lithology component: BGV TFSLST
has lithology component: BGV TUF
has source info: BGV_51027
has source info: BGV_51296
has source info: BGV_52614
has obsolete equivalent: BGV mn 253
broader: NP
has lower boundary definition: Not known.
has geographical distribution: Small area (fault boundries) immediately northwest of Barnt Green, Hereford and Worcester.
has lithology description: Crystal and crystal lithic tuffs, tuffaceous siltstones, sandstones and mudstones.
has thickness description: Not known.
has upper boundary definition: Uncertain - probable upward passage into Lickey Quartzite Formation.

Big Vein Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BGVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BGVC COAL
broader: NE

Burgy Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BGYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BGYC COAL
has obsolete equivalent: BGYC mn 691
broader: NE

Bligh Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BH
has current status: CURRENT
has theme: SPRFCL
notation: BH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: BH SANDU
has source info: BH_52994
has obsolete equivalent: BH mn 4726
broader: NE
has lower boundary definition: Passage from brackish-marine to fully marine deposits (there is evidence of a basal stratigraphic hiatus in the Dutch sector).
has geographical distribution: Not defined.
has lithology description: Marine, medium- or fine- to medium-grained, clean, yellow-brown sands with characteristic Angulus pygmaeus bivalve assemblage.
has thickness description: Mostly <5 metres, but locally exceeds 25 metres in tidal sand ridges.
has upper boundary definition: Sea bed.

Barrack Hill Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Brendon Hill Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
broader: NE

Ballachulish Subgroup And Blair Atholl Subgroup (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BHBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BHBA CALPL
has lithology component: BHBA LMST
has lithology component: BHBA MDOLO
has lithology component: BHBA MLMST
has lithology component: BHBA PEL
has lithology component: BHBA PELGP
has lithology component: BHBA PSAMM
has lithology component: BHBA QZITE
has lithology component: BHBA SEMPEL
broader: Appin Group
has lithology description: See the Lithology descriptions for the component subgroups.

Boyne Hollow Chert Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42306
has lithology component: BHC CHRT
has lithology component: BHC SANDU
has lithology component: BHC SDST
has source info: BHC_49329
has source info: BHC_50906
has obsolete equivalent: BHC st 182
broader: UGS
has lower boundary definition: Generally, loose shelly and phosphatic sands resting on the 'ragstone' at the top of the Shaftesbury sandstone. Chert beds appear a short distance above the Shaftesbury Sandstone.
has geographical distribution: From Compton Abbas (ST 870 185) northwards across the Shaftesbury sheet (313), and then across the Wincanton sheet (297).
has lithology description: Interbedded chert beds and nodules, up to 0.4 metres thick, with glauconitic sand and sandstone.
has thickness description: 0-15m (6.3m+ at the type locality).
has upper boundary definition: Above the highest bed of chert.

Boheeshane Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42307
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42308
has lithology component: BHCK CHLK
has lithology component: BHCK FLNT
has lithology component: BHCK LMST
has source info: BHCK_52106
has source info: BHCK_52212
has obsolete equivalent: BHCK mn 520
broader: UWLF
has additional age information: Campanian. Gonioteuthis quadrata and basal Belemnitella mucronata zones. From Applinocrinus [Saccocoma] cretaceus Subzone (quadrata Zone).
has lower boundary definition: Base defined by reference to the terminal pebble bed of the Creggan Chalk Formation and the stromatolitic `mulatto? surface in marginal areas.
has geographical distribution: North Antrim and East Antrim basins part of the Southern Uplands area and over parts of the Highland Border and Londonderry Shelf areas.
has lithology description: Limestone (chalk), with common massive flint bands and tabular flints. Some green-coated chalk pebble beds near the base and as a prominent bed associated with sponges in the middle of the sequence. Hard pellet chalk in softer matrix is common at some levels Divided into three main `Beds? (A, B and C) each further divided into numbered `units?. Each `Bed? separated by marked bedding planes that are locally emphasised by weathering. A number of notable fossil acmes throughout. Considered to be much finer-grained than older gritty members and termed `White Chalk? by Wolfe (1968). A distinctive massive flint band, which marks the upper limit of Gonioteuthis, is termed the Whitehead Flint Band (of bed status) whose type reference section is the old quarry at Whitehead [J 474 913].
has thickness description: Combined thickness at the type-site of 24.19m. Bed A 8.33m, Bed B 8.69m and Bed C 7.17m.
has upper boundary definition: Taken at the well-developed erosional surface at the base of the Larry Bane Chalk Formation.

Bowland High Group And Craven Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BHCR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CY
broader: NE

Berry Head Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: Brixham Limestone Formation

Blackhall Estheria Band
type: Concept
in scheme: NamedRockUnit
alternative label: BHE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Bottom Hebburn Fell Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BHEB
has current status: CURRENT
has theme: BEDRCK
notation: BHF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BHEB COAL
broader: PMCM

Blanket Head
type: Concept
in scheme: NamedRockUnit
alternative label: BHED
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BHED NATD
has lithology component: BHED REGOL
has obsolete equivalent: BHED mn 487
broader: RDEPS
has lithology description: Sheets of in-situ or partially moved weathering products of mostly <64 mm. grain size. May be frost-susceptible (clay-mica rich), cohesive deposits or non-frost-susceptible (granular) non-cohesive deposits. [Generic description: 'TMOS' procedures].

Beacon Hill Flags
type: Concept
in scheme: NamedRockUnit
alternative label: BHF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has source info: BHF_50592
has source info: BHF_50772
has obsolete equivalent: BHF mn 323
has obsolete equivalent: BHF mn 326
broader: MG
has geographical distribution: West Yorkshire [Beacon Hill, south of Ripponden, Yorkshire].
has lithology description: Thinly laminated flaggy sandstones.
has thickness description: c.10m

Baily's Hill Flint
type: Concept
in scheme: NamedRockUnit
alternative label: BHFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: SECK

Boghead Gas Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BHG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BHG COAL
broader: NE

Brainshaugh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BHGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BHGL CAMDST
has lithology component: BHGL LMST
has lateral equivalent: BHGL LFXL
broader: ULGS

Buller's Hill Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42309
has lithology component: BHGR CLAY
has lithology component: BHGR GRAV
has lithology component: BHGR SANDU
has source info: BHGR_49276
has source info: BHGR_49626
has source info: BHGR_49855
has source info: BHGR_50210
has source info: BHGR_51937
has source info: BHGR_52415
has source info: BHGR_52476
has obsolete equivalent: BHGR mn 543
has obsolete equivalent: BHGR mn 677
has obsolete equivalent: BHGR mn 1891
has obsolete equivalent: BHGR mn 4143
has obsolete equivalent: BHGR mn 678
broader: Haldon Gravel Formation
has additional age information: Described as Sparnacian to Bartonian. Thanetian is substituted for the obsolete term Sparnacian in current BGS usage.
has lower boundary definition: The Buller's Hill Gravel, flint-rich gravels (as described in the lithology description) succeed the Tower Wood Gravel - a deposit of unbedded closely-packed unabraded flints in a matrix of clay and some sand. The boundary is marked by an unconformity and a variation in colour, with the overlying Buller's Hill Gravel being pale brown or pale grey, but typically darker than the underlying Tower Wood Gravel.
has geographical distribution: Occurs on both Great Haldon and Little Haldon in south Devon.
has lithology description: Unbedded, abraded flint gravels with subordinate clay bodies and sand beds. Flint fragments are up to 0.3m diameter, fragments of vein quartz, schorl (rock composed of tourmaline and quartz), quartzite and thermally-altered Carboniferous shale and chert are also present. This unit is interpreted to have been deposited in a fluvial environment; analysis of the clay matrix by Hamblin (1973) indicated incorporation of material reworked from the Tower Wood Gravel, and from Upper Palaeozoic rocks.
has thickness description: To 21m
has upper boundary definition: The top of the Buller's Hill Gravel is in part removed by erosion, forming the modern land surface; elsewhere the flint-rich gravel of the Buller's Hill Gravel is succeeded by recent Head deposits of mixed lithology.

Barrhead Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BHGT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BHGT SDST
broader: ULGS

Bell's Hill Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHHB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHHB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42310
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42311
has lithology component: BHHB BAANDT
has lithology component: BHHB CONG
has lithology component: BHHB RY
has lithology component: BHHB SDST
has source info: BHHB_49223
has source info: BHHB_49240
has source info: BHHB_49427
has source info: BHHB_50454
has source info: BHHB_51146
has source info: BHHB_51173
has source info: BHHB_52220
has source info: BHHB_52828
has source info: BHHB_52986
has obsolete equivalent: BHHB mn 383
has obsolete equivalent: BHHB mn 382
broader: PDH
has lower boundary definition: Unconformable: first appearance of pink flow-banded rhyolite unconformably overlying basalt and andesite flows of Bonaly Volcanic Member and thin conglomerates of the Greywacke Conglomerate Formation.
has geographical distribution: Pentland Hills.
has lithology description: Pink, aphanitic, flow-banded rhyolite of flinty appearance with platy weathering. In thin section: cryptocrystalline, non-porphyritic, with no sign of fluxion or perlitic structures typical of higher rhyolites. The rhyolite is underlain locally by a thin conglomerate with subangular clasts of sandstone, chert and sporadic basic lava. Conglomerates are also intercalated with the rhyolite. At the top of the rhyolites sedimentary lenses are developed, consisting of bedded grey-green or purple micaceous sandstone with grains of quartz and microgranite, interbedded with conglomerates containing well-rounded greywacke, siltstone, microgranite and quartzite pebbles and angular rhyolite, microgranite, basalt and andesite pebbles derived from older lavas.
has thickness description: 315m maximum.
has upper boundary definition: Conformable: pink flow-banded rhyolite overlain by fine-grained basalt of the Capelaw Volcanic Member in the north. Overlain in the south by micaceous sandstones and conglomerates of the Greywacke Conglomerate Formation, and by andesites and basalts of the Allermuir Volcanic Member.

Ben Hiant Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BHI MCGBP
has lithology component: BHI MCGBV
has lithology component: BHI MCQGB
broader: Ardnamurchan Central Complex

Beacon Hill Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHIL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42312
has lithology component: BHIL S
has lithology component: BHIL V
has source info: BHIL_52145
broader: Briton's Lane Formation
has additional age information: Mid Pleistocene.
has lower boundary definition: The lower boundary of Beacon Hill Sand and Gravel is erosional throughout much of the deposit's distribution area and it generally rests upon the Beacon Green Till Member of the Sheringham Cliffs Formation. In places, especially in the vicinity of Trimingham and Gimingham, the lower boundary is tectonic and wedges of Bacton Green Till have been thrust upwards into the deposit.
has geographical distribution: Coastal sections between Marl Point Mundesley [TG 2922383] and Trimingham [TG 283388], north Norfolk, and adjacent elevated ground inland between the coast and Gimingham.
has lithology description: The Beacon Hill Sand and Gravel Member consists of shelly, cross-bedded and rippled sands with flint-rich gravel seams and sporadic intraformational ice wedge casts and drop-soil structures (periglacial involutions). The lower horizons of the deposits are intensely glaciotectonized.
has thickness description: To approximately 12m
has upper boundary definition: Where the Beacon Hill Sand and Gravel has been observed, it forms the highest stratigraphical unit within the succession intersecting the ground surface.

Barry Harbour Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42314
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42313
has lithology component: BHL CHRT
has lithology component: BHL DOLMST
has lithology component: BHL LMST
has lithology component: BHL MDST
has source info: BHL_48717
has source info: BHL_49355
has source info: BHL_49797
has source info: BHL_52569
has source info: BHL_52830
has obsolete equivalent: BHL mn 3264
has obsolete equivalent: BHL mn 3680
has obsolete equivalent: BHL mn 3847
has obsolete equivalent: BHL mn 2568
has obsolete equivalent: BHL mn 461
broader: Black Rock Limestone Subgroup
has lower boundary definition: The contact of the Cwmyniscoy Mudstone Formation with the overlying Barry Harbour Formation is gradational. In the uppermost part of the Cwmyniscoy Mudstone Formation, the proportion of packstone beds increases to exceed that of mudstone. The base of the Barry Harbour Limestone Formation is taken at the top of the last significant mudstone bed in the Cwmyniscoy Mudstone Formation, above which the succession becomes dominated by stacked fine- to coarse-grained skeletal packstones with scattered thin beds and partings of calcareous mudstone.
has geographical distribution: Vale of Glamorgan [ST 00 74]. Present in Gower [SS 50 90], Pembrokshire [SM 99 01], east crop of South Wales Coalfield [ST 25 90], Monmouth/Chepstow [ST 53 93] and Bristol/Mendip [ST50 65] areas but not mapped. Passes northwards in Wales into the Clydach Valley Subgroup.
has lithology description: Thin- to medium-bedded, dark grey, coarse- to fine-grained, commonly graded, skeletal [predominantly crinoidal, with subordinate brachiopods] packstones, either stacked or separated by thin beds and partings of calcareous mudstone. Planar, low angle and hummocky cross stratification, and cross lamination are common. Scattered bioturbation. Silicification of fossils and replacive elongate chert nodules common. In the Barry area, a unit [3 to 5m] of cross-bedded crinoidal grainstone, the Yorke Rock Bed, occurs at the top of the Formation. In the northwest of the Vale of Glamorgan, thin beds of ooid grainstone are present in the uppermost part of the Formation. Along the southeast and east crop of the South Wales Coalfield, the Formation is predominantly dolomitized; the upper part comprising very fine- to fine-grained, pale to dark grey, partly laminated and cross laminated dolomitised packstones with sparse fossiliferous lenses that are locally silicified.
has thickness description: 80m in the south of the Vale of Glamorgan, thinning northwards to 32m on the south crop of the South Wales Coalfield.
has upper boundary definition: In the Barry area, the top of the Formation is taken at the sharp contact between the crinoidal grainstones of the Yorke Rock Bed, and the thin- to medium-bedded, fine- to coarse-grained, skeletal packstones with scattered thin beds and partings of mudstone of the overlying Friars Point Limestone Formation. To the north of Barry, the top of the Formation is taken at the sharp contact between the thin- to medium-bedded packstones of the Barry Harbour Limestone Formation and the thick-bedded ooidal grainstones of the Brofiscin Oolite Formation. Along the southeast and east crop of the South Wales Coalfield the top is taken at the sharp junction between the dolomitized packstones of the Formation and the overlying dolomitized ooidal limestone of the Brofiscin Oolite Formation.

Berryhills Coal (Glasgow Area; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BHLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BHLC COAL
broader: LSC

Berryhills Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BHLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BHLS LMST
broader: LSC
has geographical distribution: Glasgow and adjacent areas, Central Coalfield.

Belhelvie Basic Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BHLV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lateral equivalent: BHLV st 98
broader: NEBAS

Beachy Head Marls
type: Concept
in scheme: NamedRockUnit
alternative label: BHMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Boat Harbour Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BHMB
has current status: CURRENT
has theme: BEDRCK
notation: BHMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42315
has lithology component: BHMB FESTC
has lithology component: BHMB MDST
has source info: BHMB_48772
broader: SYG
has lower boundary definition: Conformable.
has lithology description: Shale with ribs of clayband ironstone and marine shells.
has thickness description: 5.48m at type section.
has upper boundary definition: Conformable.

Low Haigh Moor Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BHMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BHMC COAL
has lateral equivalent: BHMC st 130
has lateral equivalent: BHMC st 511
broader: PMCM
has geographical distribution: West Yorkshire and South Yorkshire area.

Barrhead Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BHMCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BHMCO COAL
broader: LSC

Bottom High Main Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BHMN
has current status: CURRENT
has theme: BEDRCK
notation: BHM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BHMN COAL
broader: PMCM

Bottom High Main Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BHMNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BHMNC COAL
broader: PMCM

Middle Bailey Hill Beds And Upper Bailey Hill Beds (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BHMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
broader: NE
has lithology description: See the Lithology descriptions for the component units.

Bath Oolite
type: Concept
in scheme: NamedRockUnit
alternative label: BHO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has lithology component: BHO LMOOL
broader: NE

Bottom Holers Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BHOC
has current status: CURRENT
has theme: BEDRCK
notation: BoH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BHOC COAL
broader: PLCM

Ben Hope Sill Suite
type: Concept
in scheme: NamedRockUnit
alternative label: BHOS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BHOS AMPHB
broader: NE

Ballygalley Head Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BHP
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Ben Hiant Porphyritic Dolerite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BHPD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BHPD DOLFS
has lithology component: BHPD MCGBFP
broader: Ardnamurchan Centre 1

Ben Hiant Pitchstone Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: BHPI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: HM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BHPI PTSTAC
broader: Ardnamurchan Centre 1

Blelham Peat Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHPT
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42317
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42318
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42316
has lithology component: BHPT C
has lithology component: BHPT ORMUD
has lithology component: BHPT P
has lithology component: BHPT S
has lithology component: BHPT TUFA
has lithology component: BHPT Z
has source info: BHPT_48926
has source info: BHPT_49107
has source info: BHPT_49633
has source info: BHPT_49654
has source info: BHPT_49656
has source info: BHPT_50365
has source info: BHPT_50529
has source info: BHPT_50596
has source info: BHPT_51057
has source info: BHPT_51342
has source info: BHPT_51562
has source info: BHPT_51698
has source info: BHPT_51754
has source info: BHPT_52008
has source info: BHPT_52558
has source info: BHPT_52683
has source info: BHPT_52842
has source info: BHPT_52987
has obsolete equivalent: BHPT mn 3238
has obsolete equivalent: BHPT SUF
has obsolete equivalent: BHPT PEAT
broader: Cumbria-Lancashire Catchments Subgroup
has additional age information: Late Devensian (Lateglacial) to Holocene.
has lower boundary definition: Varies from sharply unconformable on bedrock and all Late Devensian or older Quarternary deposits (particularly tills), to disconformable on Lateglacial marine deposits of the Fern Beck Silt Member of the Hall Carleton Formation.
has geographical distribution: 1.50k Sheets 28 Whitehaven, 37 Gosforth, western Cumbria, 38 (Ambleside) and 39 (Windermere) but can be applied to all Holocene to Lateglacial peat deposits within the Cumbria-Lancashire Catchments Subgroup area.
has lithology description: Peal, organic mud and silt, and fine silty sand infilling lake basins, lowland bogs and mires, kettle holes and alluvial tracts, also blanketing upland areas. It may contain fossilised remains of trees, herbs, grasses, etc, pollen, leaves and insect remains. Two members are recognised: Pow Beck Peat Member, which comprises compressed peat with wood fragments, twigs and seeds, interbedded with grey silt and tufa and some friable peat. It is of Holocene age and underlies alluvial deposits of the flood plain of the Pow Beck at St Bees, Cumbria; it locally underlies beach sand at St Bees beach. It overlies the Lowca Till Member of the Seascale Glacigenic Formation on St Bees beach, and overlies the Fern Bank Silt Member of the Hall Carleton Formation in the Pow Beck valley. The Seacore Peat Member comprises felted peat, thinly interbedded with humic sands in places. It contains insects and pollen of Lateglacial age (typically c.14000-10000 14C years BP) and forms part of the infill of kettle holes (noteably within the St Bees Moraine); it also occurs beneath the Pow Beck Member in the Pow Beck valley. In the kettle holes within the St Bees Moraine it is overlain by solifluction deposits of pebbly silty sand (of Loch Lomond Stadial age) and it overlies the glacitectonised sequence of deposits forming the moraine.
has thickness description: To 5 m thick in the Blelham Bog type area.
has upper boundary definition: The ground surface, or overlain by Holocene blown sand of the Drigg Point Sand Formation or alluvium of the Ehen Alluvium Formation.

Bottom Harvey Coal (Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BHRV
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BHRV COAL
broader: PLCM

Brockholes Sandstones
type: Concept
in scheme: NamedRockUnit
alternative label: BHS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BHS SDST
broader: Bowland Shale Formation

Barnes High Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Broomhouse Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHSE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42319
has lithology component: BHSE C
has lithology component: BHSE DMTN
has lithology component: BHSE S
has lithology component: BHSE V
has lithology component: BHSE Z
has source info: BHSE_49147
has source info: BHSE_49148
has source info: BHSE_51103
has source info: BHSE_51242
has source info: BHSE_52969
has obsolete equivalent: BHSE mn 628
broader: MVG
narrower: RSSA
has additional age information: Dimlington Stadial to Windermere Interstadial.
has lower boundary definition: Unconformably on bedrock or most commonly on older Quaternary strata particularly the Wilderness Till Formation of the Midland Valley Glacigenic Subgroup.
has geographical distribution: Central Scotland; Glasgow area, Stirling, Clackmannan, Tayside, north and south Lanarkshire, Lothians and Edinburgh, Fife and probably also Ayrshire.
has landform description: Surface morphologies are of ice-contact; esker ridges, mounds and closed hollows.
has lithology description: Lithological associations are of rare matrix-supported bouldery gravel with sand, common framework-supported bouldery gravel with sand and pebbly coarse- to fine-grained sand, silt and clay. The most abundant is sand. The unit varies from loose to very dense and is up to 25m thick. Much of the gravel is massive to crudely bedded but planar beds and trough cross-bedded units are present. Sands are planar and trough cross-bedded, and ripple and horizontally laminated. Deformed bedding (including reverse faults and folds) probably marks the former contacts with dead-ice. The coarsest gravels were deposited by meltwaters flowing through tunnels in the wasting ice, massive deposits may have been laid down in the full-pipe sliding bed phase of water transport but most show cross-bedding features consistent with fluviodeltaic processes. Sandy clay diamictons might have been formed as debris flows in a fluvial context. Two members have been identified, the Ross Sand and Bellshill Clay.
has supplementary information: The Broomhouse Sand and Gravel is named from Broomhouse, eastern Glasgow. Stratigraphical relationships and geographical distribution are in Browne and McMillan (1989a, Figures 2b, 3c and 4a).
has thickness description: Veneer about 25m.
has upper boundary definition: Unconformably below younger Quaternary strata such as the Clyde Clay Formation but also exposed at surface.

Bulkeley Hill Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42320
has lithology component: BHSF MDST
has lithology component: BHSF SDST
has source info: BHSF_48671
has source info: BHSF_49046
has source info: BHSF_49697
has source info: BHSF_52516
has obsolete equivalent: BHSF mn 675
has obsolete equivalent: BHSF mn 2201
broader: SSG
has lower boundary definition: Conformable, within a gradational, interdigitating transition from the red, fine- to medium-grained sandstones of the Wilmslow Sandstone Formation to the interbedded red and green mudstone, brown flaggy sandstone and red-brown cross-stratified sandstone of the Bulkeley Hill Sandstone Formation.
has geographical distribution: Crops out at surface in the Bulkeley area, south Cheshire. Westwards, the formation is cut out beneath the erosional base of the overlying Helsby Sandstone Formation (Poole and Whiteman, 1966). In the subsurface to the east (Prees area), the formation is most fully developed in the hanging wall of the fault zone marking the eastern boundary of the Cheshire Basin, where seismic evidence (Evans et al., 1993) indicates a thickness of over 200m.
has lithology description: Sandstone, red, medium-grained with well-rounded "millet seed" grains, cross-stratified, interbedded with mudstone, red-brown and grey-green, and sandstone, brown, fine-grained, flaggy, micaceous.
has thickness description: Up to 22m at outcrop in the Bulkeley area, Cheshire (Poole and Whiteman, 1966), may reach up to 200m in the subsurface to the east, based on seismic evidence (Evans et al., 1993).
has upper boundary definition: Unconformable, at the abrupt upward transition from the interbedded red and green mudstone, brown flaggy sandstone and red-brown cross-stratified sandstone of the Bulkeley Hill Sandstone Formation to deep red and grey mottled, coarse-grained pebbly sandstone at the base of the Helsby Sandstone Formation.

Barham Sands And Gravels
type: Concept
in scheme: NamedRockUnit
alternative label: BHSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BHSG GRAV
has lithology component: BHSG SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Beachy Head Sponge Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BHSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Boyn Hill Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BHT
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42321
has lithogenesis: FLUV
has lithology component: BHT C
has lithology component: BHT S
has lithology component: BHT V
has source info: BHT_48803
has source info: BHT_51353
has source info: BHT_51596
has obsolete equivalent: BHT mn 555
has obsolete equivalent: BHT mn 556
broader: TV
has lower boundary definition: Rests unconformably on bedrock geology or older superficial deposits.
has geographical distribution: Thames Valley and associated tributaries.
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description]. Poorly sorted, stratified gravel and locally tabular cross-bedded sand beds. Gravel assemblage is characterised by abundant angular flint (77-81%), sparse rounded flint (5-10%), sparse vein quartz (4-7%), sparse quartzite (1.5-5%), sparse Greensand chert (2.5-4%) and less than 1% of other types.
has thickness description: 1-9m, average 5m
has upper boundary definition: At surface.

Blackhall Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42322
has lithology component: BHTI DMTN
has lithology component: BHTI S
has lithology component: BHTI V
has source info: BHTI_49139
has source info: BHTI_49140
has source info: BHTI_49811
has source info: BHTI_50508
has source info: BHTI_50596
has obsolete equivalent: BHTI mn 1369
has lateral equivalent: BHTI st 115
broader: NSG
has lower boundary definition: Either rests directly on bedrock or as a sharp, subhorizontal, planar to gently undulating contact with limestone-rich gravel of the Limekiln Gill Gravel Formation.
has geographical distribution: Coast of County Durham and southern Northumberland.
has lithology description: Dark grey to greyish brown, locally reddish brown, very stiff, stony sandy silty clay diamicton with sparse fragments of shell. It contains clasts mostly of Carboniferous lthologies in southern Northumberland, with far-travelled rocks from the Southern Uplands and, south of Blyth, from the Lake District too; local Permian lithologies predominate south of the Tyne. Generally becomes more clayey and plastic upwards. Includes local lenses of sand and gravel.
has thickness description: Up to 15m
has upper boundary definition: Generally a sharp, uneven, erosional contact with overlying red fine-grained sand of the Peterlee Sand Formation along the Durham coast.

Bottom Hutton Coal (Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BHUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BHUC COAL
broader: PMCM

Bathgate Hills Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHV
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42323
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42324
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42325
has lithology component: BHV BA
has lithology component: BHV BAOCM
has lithology component: BHV BAPOCM
has lithology component: BHV BAR
has lithology component: BHV BATUF
has lithology component: BHV LAVA
has lithology component: BHV PYBA
has lithology component: BHV TUF
has lithology component: BHV VCBR
has source info: BHV_48703
has source info: BHV_50989
has source info: BHV_52764
has source info: BHV_52811
has obsolete equivalent: BHV mn 319
has obsolete equivalent: BHV mn 318
broader: Bathgate Group
has lower boundary definition: First occurrence of volcanic rocks above the Two Foot Coal in the West Lothian Oil-Shale Formation.
has geographical distribution: Bathgate Hills, west of a line from NT0066 to NT0980, extending westwards underground to a point west of the Rashiehill Borehole (NS839730).
has lithology description: Pyroclastic rocks and related basaltic lavas, mostly alkali olivine-basalts (basanite to hawaiite) and volcaniclastic rocks.
has thickness description: To 1000m
has upper boundary definition: Highest occurrence of volcanic rocks, below the Roman Cement Limestone, Passage Formation.

Beacon Hill Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BHVF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42326
has lithology component: BHVF MDST
has lithology component: BHVF SDST
has lithology component: BHVF TUF
has source info: BHVF_48715
has source info: BHVF_49392
has source info: BHVF_49912
has source info: BHVF_51180
has source info: BHVF_51272
has obsolete equivalent: BHVF mn 324
broader: Aran Volcanic Group
has lower boundary definition: Marked by the rapid transition from bioturbated fine-grained sandstones (Basement Beds of Jones, 1933 op.cit) to massive tuffs.
has geographical distribution: Extends from coast north of Tywyn as far as Llanegryn Fault in the east. Equivalent to the Lower Acid Group (Cox, 1925. Quarterly Journal of the Geological Society of London, Vol.81) to the east of the Llanegryn Fault.
has lithology description: Massively-bedded and unbedded acid tuffs rich in embayed quartz xenocrysts. Locally, welding fabrics are preserved. Also includes agglomeratic tuffs, sandstones and mudstones.
has thickness description: Very variable - complicated by intrusion of dolerite sills. 40m - 420m.
has upper boundary definition: Marked by the rapid transition from massive tuffs to mudstones, conglomerates and siltstones of the Bifidus Slate Formation.

Belhaven Point Vent
type: Concept
in scheme: NamedRockUnit
alternative label: BHVN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BHVN AGG
has lithology component: BHVN BSN
has lithology component: BHVN TUF
broader: SSDLO

Bromsgrove Sandstone Formation, Helsby Sandstone Formation, Wildmoor Sandstone Formation And Wilmslow Sandstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BHWW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has lithology component: BHWW CONG
has lithology component: BHWW MDST
has lithology component: BHWW SDST
has lithology component: BHWW SLST
broader: SSG
has lithology description: See the Lithology descriptions for the component formations.

Beinn Iadain Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIAD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GP
broader: NE

Birdsall Calcareous Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: BICG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has lithology component: BICG CALSST
has lithology component: BICG CHRT
has lithology component: BICG SLST
broader: Coralline Oolite Formation

Bickerton Moraines Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BICKM
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: NPEG

Bilton Coal Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BICO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42327
has lithology component: BICO COAL
has lithology component: BICO MDST
has source info: BICO_48938
has source info: BICO_52594
has obsolete equivalent: BICO BILC
broader: Hebden Formation
has lower boundary definition: Sharp on mudstone.
has geographical distribution: Bilton area, just north of Harrogate to Bishop Thornton, north of Harrogate.
has lithology description: Two coal seams separated by mudstone.
has thickness description: 4-5.2
has upper boundary definition: Sharp overlain by mudstone.

Binny Craig Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BICS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: CU
has youngest age: CU
has lithology component: BICS BA
broader: MVSC

Birgidale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BID
has current status: CURRENT
has theme: BEDRCK
notation: BID
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42328
has lithology component: BID COAL
has lithology component: BID CONG
has lithology component: BID MDST
has lithology component: BID SDST
has lithology component: BID SEATS
has lithology component: BID SLST
has source info: BID_50587
broader: SYG
has additional age information: Visean (?early Asbian).
has lower boundary definition: Base sharp, probably erosional, on the Clyde Sandstone Formation (top of Inverclyde Group), which is characterised by presence of pedogenic limestone and lack of coal seams.
has geographical distribution: Area around Birgidale Knock, south Bute, Scotland.
has lithology description: Grey mudstones, sandstones and seatearths with coal seams; non-marine.
has thickness description: c.16m (24m in Ascog Borehole).
has upper boundary definition: Top is marked by the overlying Clyde Plateau Volcanic Formation. May be transitional, with interbedding of sedimentary rocks with lava flows.

Biddenham Member
type: Concept
in scheme: NamedRockUnit
alternative label: BIDM
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42329
has lithology component: BIDM C
has lithology component: BIDM S
has lithology component: BIDM V
has source info: BIDM_49187
has source info: BIDM_50918
has source info: BIDM_52373
has obsolete equivalent: BIDM mn 4172
broader: OUSE
has lower boundary definition: Unconformable, commonly chanelled base, resting on bedrock surface.
has geographical distribution: River Great Ouse Valley, Central England.
has lithology description: Fluviatile gravel with sand: contains thin fossiliferous clay layers with a temperate molluscan fauna. Numerous artifacts of Acheulian type have also been recorded.
has thickness description: 0 to 4m
has upper boundary definition: Ground surface.

Barra Isles Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: BIDY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BIDY MCOLGB
broader: PDNB

Bielby Peat Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BIEP
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Breighton Sand Formation

Bielby Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BIES
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42330
has lithology component: BIES P
has lithology component: BIES SC
has lithology component: BIES SVZ
has lithology component: BIES SZ
has source info: BIES_49658
has source info: BIES_50427
has obsolete equivalent: BIES mn 3703
broader: Breighton Sand Formation
has additional age information: Late Devensian.
has lower boundary definition: The Bielby Sand Member rests mainly on the Pocklington Gravel Formation or the Hemingbrough Glaciolacustrine Formation. In places there is a thin peat bed at the base. The contact is commonly sharp but locally gradational, with an increase in clay, gravel and/or peat content. North of Bielby, an increase in gravel and peat content marks the lower boundary.
has geographical distribution: The Bielby Sand Member is known to extend along the eastern side of the Vale of York from the Escrick Moraine in the north to the Humber in the south. The deposit is part of a Late Devensian drainage system and forms some levee-like features, particularly around Melbourne. In some areas it is covered by younger deposits but has probably commonly been removed by later erosion.
has lithology description: Dominantly yellow to pale brown and reddish yellow slightly clayey to slightly silty sand with local fine-grained gravels. The material is usually reddish brown and grey colour mottled as a result of near surface water processes. It is typically composed of moderately well sorted medium-grained quartz grains with minor bands of finer, coarser or pooly sorted material, including flint and chert. Thin beds (<5cm) of clayey sandy peat can occur within the unit.
has thickness description: General thickness is between 1 and 2m, but it can exceed 6m in parts and may form elevated topographic features.
has upper boundary definition: The upper surface of the Bielby Sand Member is usually eroded and overlain by younger alluvial and aeolian deposits.

Brindister Flagstones
type: Concept
in scheme: NamedRockUnit
alternative label: BIF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Big Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: BIGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BIGC COAL
has obsolete equivalent: BIGC mn 424
broader: Farrington Member

Bighouse Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIGH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42331
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42332
has lithology component: BIGH CONG
has lithology component: BIGH LMST
has lithology component: BIGH SDST
has lithology component: BIGH SLST
has source info: BIGH_49080
has source info: BIGH_50219
has source info: BIGH_51699
has source info: BIGH_52360
has obsolete equivalent: BIGH mn 427
broader: Caithness Flagstone Group
narrower: Baligill Limestone Member
narrower: PSKA
narrower: RBSM
narrower: Fresgoe Sandstone Member
has lower boundary definition: Unconformable contact on Lower Devonian sandstone [Luachair Sandstone Member] and conglomerate [Tobaireach Conglomerate Member] of the Ousdale Arkose Formation. Also unconformable on Caledonian intrusive igneous rocks and Moinian metamorphic basement rocks.
has geographical distribution: Onshore and immediately offshore of Dounreay area, Caithness, Northern Scotland.
has lithology description: Sequence dominated by thickly bedded aeolian and fluviatile cross-bedded sandstone units with minor interbeds of conglomerate in the lower parts of the sequence, siltstones and microsparitic limestone interbeds also present. Thick mappable sandstone [Fresgoe Sandstone Member] present [topmost unit] also recognisable in borehole core and seismic records. Prominent laminated limestones [Baligill Limestone Member] present in the middle part of the Formation. Breccio conglomerate [Portskerra Conglomerate Member] present locally as basal unit of the formation; bed or beds of limestone [Arylevie Limestone Bed] present within or at the base of the Portskerra Conglomererate Member at some localities.
has thickness description: 200 to 250m
has upper boundary definition: Top of Fresgoe Sandstone Member, overlain by Sandside Bay Formation.

Bigholms Burn Peat Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BIGP
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Big Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BIGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BIGR COAL
has lateral equivalent: BIGR N1LC
broader: Grovesend Formation

Bodmin Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BIIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
broader: NA

Bilton Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BILC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: BILC COAL
is obsolete equivalent of: BILC BICO
broader: Hebden Formation

Bellshill Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BILL
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42333
has lithology component: BILL C
has lithology component: BILL DMTN
has lithology component: BILL S
has lithology component: BILL Z
has source info: BILL_49147
has source info: BILL_49148
has source info: BILL_51103
has source info: BILL_52789
has source info: BILL_52969
has obsolete equivalent: BILL mn 384
has obsolete equivalent: BILL mn 385
broader: MVG
has additional age information: Dimlington Stadial.
has lower boundary definition: Unconformity on bedrock or most commonly on older Quaternary strata, particularly the Wilderness Till Formation of the Midland Valley Glacigenic Subgroup. Conformably by passage on the Ross Sand Member.
has geographical distribution: Central Scotland; Glasgow area in the lower Clyde valley below Lanark and in tributary valleys including Strath Kelvin.
has lithology description: The typical lithological association is of silty clay with wisps, laminae and bands of silt and locally sand. The deposit is dark brownish grey to brownish grey. It may be varved with multiple silt units with graded bedding. Isolated clasts up to 1-2cm are interpreted as dropstones. The clays are of a firm to stiff consistency. Diamicton bands are present and there are dark tops to centimetre-scale varve units. The sedimentological features point to the Member being a proglacial lake bed deposit ("Lake Clydesdale") close to an ice margin. Its distribution in the Clyde valley southeast of Glasgow suggests that the ice margin retreated northwestwards through the area.
has supplementary information: The Crossford Borehole (Browne and McMillan 1989a, Figure 24) is the standard section for the Bellshill Clay Member, between 0.5 and 6.91m in depth, where it rests on the Ross Sand Member. The name is from the Bellshill area where the unit is widely distributed at surface. Its stratigraphical relationships and geographical distribution in ibid are illustrated in ibid (Figures 2B, 3D and 4A).
has thickness description: Veneer to about 10m.
has upper boundary definition: Unconformity below younger Quaternary strata such as the Clyde Clay Formation, but also exposed at the surface. Conformably by passage laterally and upwards into the Ross Sand Member.

Bilston Rock (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BILR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Birkfield Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BILS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BILS LMST
broader: LLGS

Brighton Marl
type: Concept
in scheme: NamedRockUnit
alternative label: BIMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Bilinguites Bilinguis Marine Band [See Also: R2b1 R2b2 R2b3]
type: Concept
in scheme: NamedRockUnit
alternative label: BIMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BIMB MDST
has obsolete equivalent: BIMB mn 4727
has lateral equivalent: BIMB st 710
broader: MG

Lower Bishopsmoat Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BIML
has current status: CURRENT
has theme: BEDRCK
notation: BIML
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42334
has lithology component: BIML MDST
has lithology component: BIML SLST
has source info: BIML_52218
broader: NE
has lower boundary definition: Upward change in lithology from grey thickly bedded (blotchy) mudstone to grey interbedded siltstones and mudstones; thicker siltstones are calcareous and commonly show intense convolute lamination.
has geographical distribution: Not defined.
has lithology description: Grey interbedded mudstones and siltstones; thin siltstones show parallel lamination, thicker beds are calcareous and commonly show intense convolute lamination.
has thickness description: c. 125m. Lateral variations 0-400m.
has upper boundary definition: Not seen in area of survey.

Upper Bishopsmoat Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BIMU
has current status: CURRENT
has theme: BEDRCK
notation: BIMU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42335
has lithology component: BIMU MDST
has lithology component: BIMU SDST
has lithology component: BIMU SLST
has source info: BIMU_52218
broader: NE
has lower boundary definition: Upward change from grey interbedded siltstones and mudstones, the thicker siltstones with intense convolute lamination, to grey parallel laminated siltstones with subordinate mudstones.
has geographical distribution: Not defined.
has lithology description: Grey parallel laminated siltstones with subordinate mudstones; some thin fine-grained sandstone beds; convolute lamination uncommon.
has thickness description: Not surveyed. Total thickness c. 300m.
has upper boundary definition: Not seen in area of survey.

Bin Down Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bin
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42336
has lithology component: BIN LAVA
has lithology component: BIN MDST
has lithology component: BIN QZITE
has lithology component: BIN VLSS
has source info: BIN_50742
has source info: BIN_52133
has source info: BIN_52800
has obsolete equivalent: BIN DRTM
has obsolete equivalent: BIN mn 1223
broader: Dartmouth Group
has lower boundary definition: Faulted off against purple and green mudstone of the Whitsand Bay Formation.
has geographical distribution: Geological sheet 348 (not mapped elsewhere).
has lithology description: Grey slaty mudstone and quartzitic sandstone with interbedded, apparently extensively silicified basic lava and volcaniclastic rocks.
has thickness description: 300m
has upper boundary definition: Grey slaty mudstone passing up into purple and green slaty mudstone of the Whitsand Bay Formation.

Balmoral Index Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BINC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BINC COAL
broader: LCMS

Binnend Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BINL
has current status: CURRENT
has theme: BEDRCK
notation: BINL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BINL LMST
broader: NE

Binnend Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BINS
has current status: CURRENT
has theme: BEDRCK
notation: BinS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42337
has lithology component: BINS SDST
has obsolete equivalent: BINS mn 433
broader: SCB
has lower boundary definition: Conformable.
has geographical distribution: The Burntisland area of Fife,
has lithology description: Sandstone.
has thickness description: 33.32m. (Top 14.22m. Bottom 47.54m).
has upper boundary definition: Conformable.

Bog Iron Ore
type: Concept
in scheme: NamedRockUnit
alternative label: BIO
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Chemical Deposits
has lithology description: Impure, limonitic deposit, usually porous and probably formed as a result of bacterial action in swampy conditions; a low grade iron ore. [Generic description: Earth science dictionaries in the BGS library].

Beinn Iaruinn Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BIQU QZF
has lithology component: BIQU SEMPEL
broader: Glen Spean Subgroup

Birchlaw Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BIR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BIR LMST
broader: ULGS

Birchenwood Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BIRC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Bw
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BIRC COAL
broader: NE

Birtley Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BIRT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BIRT LMST
broader: YORE

Birrenswark Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIRV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BIRV
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42338
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42339
has lithology component: BIRV ASH
has lithology component: BIRV BAANDT
has lithology component: BIRV BALAVA
has lithology component: BIRV BAOM
has lithology component: BIRV BAPOCM
has lithology component: BIRV BARPM
has lithology component: BIRV BARPMA
has lithology component: BIRV BATUF
has lithology component: BIRV MDST
has lithology component: BIRV OLBA
has lithology component: BIRV SDST
has lithology component: BIRV SLST
has lithology component: BIRV TUF
has source info: BIRV_48840
has source info: BIRV_49230
has source info: BIRV_51148
has source info: BIRV_53020
has lateral equivalent: BIRV KT
has obsolete equivalent: BIRV mn 442
has obsolete equivalent: BIRV mn 441
broader: INV
has lower boundary definition: Irregular base on Upper Old Red Sandstone strata.
has geographical distribution: Lavas are best developed between Dinely and Langholm. They thin westwards towards Birrenswark Hill; the westernmost extension is west of Dumfries at Kirkbean Glen, Southerness, Kirkcudbrightshire.
has lithology description: Olivine-basalt lavas with impersistent sedimentary intercalations.
has thickness description: 15-60m
has upper boundary definition: Faulted or irregular contact with Kirkbean Cementstone Member.

Bilsdean Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BIS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has source info: BIS_51253
broader: SYG
has geographical distribution: Type locality is at Bilsdean, near Cockburnspath, Berwickshire.
has lithology description: Yellow fine-grained even bedded sandstone.
has thickness description: c,12m

Bisat Group
type: Concept
in scheme: NamedRockUnit
alternative label: BISA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has source info: BISA_52697
broader: NE

Bogside Ironstone And Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BISC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BISC COAL
has lithology component: BISC FEST
broader: PGP

Birstall Member
type: Concept
in scheme: NamedRockUnit
alternative label: BISG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has lithogenesis: FLUV
has lithology component: BISG CLAY
has lithology component: BISG GRAV
has lithology component: BISG SANDU
has lithology component: BISG SILT
has source info: BISG_49449
has source info: BISG_51090
has source info: BISG_52528
has obsolete equivalent: BISG mn 444
has obsolete equivalent: BISG mn 443
broader: SOARV
has lower boundary definition: The bedrock surface - commonly cryogenically involuted; other deposits may intervene.
has geographical distribution: Soar Valley and tributary valley of Kingstone Brook.
has lithogenesis description: River Terrace Deposits.
has lithology description: Sand and gravel with minor clay and silt lenses.
has thickness description: To c.4m
has upper boundary definition: Top of sand and gravel, commonly corresponding to terrace surface; commonly overlain by head that is involuted with sand and gravel to varying degrees.

Bishopston Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BISHM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CY
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42340
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42341
has lithology component: BISHM COAL
has lithology component: BISHM MDST
has lithology component: BISHM SDST
has lithology component: BISHM SLST
has source info: BISHM_49152
has source info: BISHM_49279
has source info: BISHM_51364
has source info: BISHM_51881
has source info: BISHM_52771
has obsolete equivalent: BISHM mn 447
has obsolete equivalent: BISHM mn 2886
broader: MARR
narrower: Anthracoceratites Marine Band
has lower boundary definition: In the type area the lower boundary is placed at the base of thick, dark grey fossiliferous mudstones, where they overlie cherts and dark grey fissile mudstones of the Aberkenfig Formation conformably. The contact is not exposed there. Elsewhere, the lower boundary is placed at the base of thick grey, sporadically fossiliferous mudstones, which overlie the quartzitic sandstones of the Twrch Sandstone Formation disconformably.
has geographical distribution: The Formation crops out in a narrow belt around the periphery of the South Wales Coalfield and its extension in Pembrokeshire. The outcrop around the main coalfield extends from near Kidwelly [SN 360 050] on the north crop eastnortheast to near Brynmawr [SO 20 11] and south to near Caerphilly [ST 20 86] and west to Swansea Bay [SS 79 84]; in Gower from Bishopston to Mumbles; and in the Pembroke Peninsula from Druidston [SM 860 169] to Marros [SN 198 076]; and on the southern limb of the syncline from Tenby [SN 135 010] northwest to near the Cleddau River [c.SN 012 085].
has lithology description: Mid to dark grey mudstones, commonly fossiliferous, with some beds of mid grey siltstone and beds of interbedded siltstone and mudstone. Sporadic, minor pale grey quartzitic sandstones and rare thin coals.
has thickness description: To c.750m in the type area of Barland Common, Bishopston.
has upper boundary definition: The top is placed at the top of the highest dark grey mudstone, where it is overlain disconformably by pale grey quartzitic sandstones of the Telpyn Sandstone Formation.

Binds Stone (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BIST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Bittadon Tuff Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BITB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
broader: NE

Birchwood Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BIWS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BIWS CALSIR
has lithology component: BIWS PEL
has lithology component: BIWS QZITE
has lithology component: BIWS SEMPEL
has source info: BIWS_49438
broader: Ballachulish Subgroup
narrower: Creag Mhor Limestone Member
narrower: BABL
narrower: Baddoch Burn Limestone Member
narrower: Baddoch Burn Limestone Member [Redundant Code: Use Badl]
narrower: Gleann Beag Limestone Member

Burton Joyce Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BJMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has source info: BJMB_52178
has lateral equivalent: BJMB st 260
has obsolete equivalent: BJMB st 260
broader: PLCM
has geographical distribution: Originally defined in Nottingham and present in the Derbyshire-Nottinghamshire area and, as the equivalent Ditton Marine Band, in the Lancashire Coalfield.

St John's Rhyolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BJR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BJR RY
has source info: BJR_49733
broader: JYVO
has geographical distribution: Within the outcrop of the Jersey Volcanic Group in northern Jersey.
has lithology description: Ignimbritic rhyolite flows.

Brockram
type: Concept
in scheme: NamedRockUnit
alternative label: BK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42342
has lithology component: BK BREC
has lithology component: BK SDST
has source info: BK_48672
has source info: BK_48673
has source info: BK_48674
has source info: BK_49238
has source info: BK_51025
has source info: BK_51679
broader: Appleby Group
narrower: MOSI
narrower: KHBR
has lower boundary definition: Sharp and irregular unconformable contact with older rocks, usually Dinantian, Westphalian or Ordovician (Borrowdale Volcanic Group). Geophysically the base is usually sharp, marked by a decrease in gamma-ray values and sonic interval transit times. This is most marked in West Cumbria where Brockram overlies the Carboniferous Limestone (Dinantian).
has geographical distribution: Vale of Eden, West Cumbria, Furness
has lithology description: Matrix and clast-supported breccias; clasts range from small pebble to cobble; the matrix is variously clay, silt and/or sand. The clasts reflect the local source rocks.
has thickness description: Very variable, up to 160m
has upper boundary definition: May be sharp or transitional in West Cumbria. Sharp contact with overlying dolomite or dolomitic mudstones of the St Bees Evaporite Formation is marked by a rapid decrease in gamma-ray values and a less marked decrease in sonic interval transit times.

Birkby Fell Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bkb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42343
has lithology component: BKB BA
has lithology component: BKB BAANDT
has lithology component: BKB BATUF
has lithology component: BKB TUF
has lithology component: BKB VCSST
has source info: BKB_50725
has source info: BKB_53059
has obsolete equivalent: BKB mn 435
broader: Birker Fell Andesite Formation
has lower boundary definition: Base of lowest basaltic andesite/basalt flow. Rests on Devoke Water Member in type area; farther east on undivided feldspar-phyric andesites of the Birker Fell Andesite Formation.
has geographical distribution: Birkby Fell, Eskdale, Cumbria (SD 14 95) also Whincop, Eskdale (SD 180 993), Cumbria.
has lithology description: Dark grey to greenish grey basaltic and basaltic andesite lava flows; generally thin, porphyritic, simple aa-flows and intercalated bedded tuffs and volcaniclastic sandstones.
has thickness description: 430 - >500m (upper boundary faulted in part). Absent to east of Devoke Water.
has upper boundary definition: Overlain by blocky, porphyritic andesite flows of Birker Fell Andesite Formation (undivided).

Black Bed Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BKBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BKBC COAL
broader: PLCM
has lithology description: The Black Bed Coal is generally a good coal of former high economic importance despite common splits and local washouts. It has been mined extensively throughout the district, down to depths of more than 300m.

Black Band Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKBD
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KT
has lithology component: BKBD CAMDST
has lithology component: BKBD CHLK
has lithology component: BKBD CLKM
has lithology component: BKBD CMDST
has source info: BKBD_49494
has source info: BKBD_51553
has source info: BKBD_52198
has source info: BKBD_53009
has lateral equivalent: BKBD st 92
has obsolete equivalent: BKBD mn 4
has obsolete equivalent: BKBD mn 1589
has obsolete equivalent: BKBD PLMA
has obsolete equivalent: BKBD mn 280
has obsolete equivalent: BKBD mn 4497
broader: WCK
has additional age information: Cenomanian (Neocardioceras juddi Zone) to Turonian (Mytiloides spp. Zone).
has lower boundary definition: Conformable at the basal surface of the Main Black Band as defined in Wood and Mortimore (1995) and Wood et al. (1997) with the underlying Plenus Marls Member defined herein.
has geographical distribution: A well-known marker throughout the Northern Province and in the offshore areas.
has lithology description: Interbedded black or very dark carbonaceous calcareous mudstone (the Black Band) and variegated calcareous mudstone (marl) succession terminating in the "sticky green clay" (Wood and Mortimore, 1995).
has thickness description: Generally about 0.5 to 0.6m but up to 1.4m in the Cleveland Basin.
has upper boundary definition: Conformable at the junction between a sticky green clay (Bed 6 i.e. the top of the "Variegated beds", in Figure 4, Wood and Mortimore, 1995) and an extremely condensed succession of shell-detrital limestones with some thin very dark "marl" seams.

Black Band Coal (South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BKBDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BKBDC COAL
broader: PLCM

Bowsebank Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: BKC COAL
broader: NE

Blackclose Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BKCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BKCC COAL
has lateral equivalent: BKCC st 591
broader: PMCM

Brock Crags Andesite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BKCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BkCg
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42344
has lithology component: BKCG AND
has lithology component: BKCG LPTUF
has lithology component: BKCG VCSST
has source info: BKCG_51563
broader: Borrowdale Volcanic Group
has lower boundary definition: Taken at the base of the autobrecciated andesite overlying a few metres of sandstone of the Esk Pike Sandstone Formation. In some poorly exposed areas it may overlie silicic lapilli-tuff of the Lincomb Tarns Tuff Formation.
has geographical distribution: Brock Crags to Angle Tarn, south of Ullswater, Cumbria.
has lithology description: Locally brecciated andesite lavas, with thin intercalations of lapilli-tuff and volcaniclastic sandstone.
has thickness description: To at least 290m
has upper boundary definition: Not seen.

Black Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BKCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BKCO COAL
broader: Downend Member

Birkenhead Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BKD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BKD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42345
has lithology component: BKD PESST
has lithology component: BKD SDST
has source info: BKD_48677
has source info: BKD_52494
has obsolete equivalent: BKD mn 4711
broader: WHD
has lower boundary definition: Transitional from greyish red sandstones and siltstones of the Leaze Formation.
has geographical distribution: Muirkirk to Strathaven area, Strathclyde region, Central Scotland.
has lithology description: Sandstones, greyish orange, medium-grained, cross-bedded with a few thin pebbly beds.
has thickness description: 110m.
has upper boundary definition: Sharp boundary with dark greenish grey mudstones at base of Dippal Burn Formation.

Buckator Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BKF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42346
has lithology component: BKF LMST
has lithology component: BKF MDST
has lithology component: BKF SLST
has source info: BKF_51557
has source info: BKF_53044
broader: TEVY
has lower boundary definition: Lower boundaries with the Boscastle Formation are taken at the gradational appearance of green grey mudstones with thin calcareous siltstones and limestones of the Buckator Formation above the dark grey sandstones and mudstones of the underlying Boscastle Formation.
has geographical distribution: Between Boscastle (SX 11 93) and Launceston (SX 33 85), north Cornwall.
has lithology description: Greenish grey mudstones with scattered thin calcareous siltstones. Several lenticular units of locally shelly limestone up to 0.6m thick are present. The formation intertongues with the Boscastle Formation, two tongues being present on the north Cornish coast.
has thickness description: 35m+. Full thickness of formation not exposed.
has upper boundary definition: Upper boundaries with the Boscastle Formation are taken at the gradational appearance of dark grey sandstones and mudstones of the overlying Boscastle Formation above the green-grey mudstones, with thin calcareous siltstones and limestones of the Buckator Formation.

Beckford Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: BKFD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: BKFD GRAV
has lithology component: BKFD SANDU
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description].

Barkisland Flags
type: Concept
in scheme: NamedRockUnit
alternative label: BKFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BKFL MDST
has lithology component: BKFL SDST
broader: MARSD

Bank Farm Coal (Wyre Forest)
type: Concept
in scheme: NamedRockUnit
alternative label: BKFM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BKFM COAL
broader: Halesowen Formation

Blackcraig Formation And Galdenoch Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BKGA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: Barrhill Group

Bothkennar Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42347
has lithology component: BKGR B
has lithology component: BKGR C
has lithology component: BKGR L
has lithology component: BKGR S
has lithology component: BKGR V
has lithology component: BKGR Z
has source info: BKGR_49191
has source info: BKGR_50308
has source info: BKGR_52557
has lateral equivalent: BKGR st 154
has obsolete equivalent: BKGR mn 533
has obsolete equivalent: BKGR mn 532
broader: Forth Clay Formation
has additional age information: Loch Lomond Stadial.
has lower boundary definition: Markedly erosive base cut into the various members of the Forth Clay Formation, Wilderness Till Formation and bedrock.
has geographical distribution: Lower Forth valley, Forth estuary and Firth of Forth, concealed below younger estuarine and marine deposits.
has lithology description: Fine- to coarse-grained gravel, cobbles and boulders (one recorded to be at least 1.8m across in an old excavation at Bo'ness), subangular to rounded with some striated, locally in a matrix that varies from loose sand to firm clayey sandy silt. Clasts of mainly locally-derived Carboniferous and Devonian lithogies. The deposit is poorly sorted. It is considered to have been deposited by ice-rafting of materials during the Loch Lomond Stadial.
has thickness description: Veneer to at least 3.5m
has upper boundary definition: Overlain unconformably by the early Holocene transgressive estuarine sand, silt and clay of the Letham Silt Member and also younger units including the Carse of Stirling Clay Member and later Claret Clay Member (Carse Clay Formation).

Baulking Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Brock Hall Coal (Wyre Forest)
type: Concept
in scheme: NamedRockUnit
alternative label: BKHA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BKHA COAL
broader: Halesowen Formation

Blackhill Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BKHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BKHC COAL
broader: NE

Black Hill Laccolith
type: Concept
in scheme: NamedRockUnit
alternative label: BKHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: BKHI FELS
has lithology component: BKHI MCGN
has obsolete equivalent: BKHI mn 452
broader: MVFEI

Beckingham Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKHM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bkg
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42348
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42349
has lithology component: BKHM LMST
has lithology component: BKHM MDST
has lithology component: BKHM PHOST
has source info: BKHM_49323
has source info: BKHM_51195
has source info: BKHM_51753
has obsolete equivalent: BKHM mn 665
broader: SMD
narrower: LCHL
narrower: Dry Doddington Nodule Bed
has lower boundary definition: Top of highest limestone in Granby Member.
has geographical distribution: East Midlands Shelf; thickens southwards towards London Platform; northwards, limestone beds develop within mudstone sequence.
has lithology description: Bluish-grey shaly mudstones, with rare thin limestones comprising a few per cent of the sequence.
has thickness description: 21m to 24m; 22.10m in borehole F/B5.
has upper boundary definition: Base of (ferruginous) Stubton Limestones in Foston Member, (see Brandon and others, 1990, for details of Stubton Limestones and other beds within Members).

Black Isle Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: BKI
has current status: CURRENT
has theme: BEDRCK
notation: BkI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42350
has lithology component: BKI CONG
has lithology component: BKI SDST
has lithology component: BKI SLST
has source info: BKI_48667
has obsolete equivalent: BKI mn 2869
broader: ORS
narrower: RDF
has lower boundary definition: Unconformable base of Old Red Sandstone sequence.
has geographical distribution: Easter Ross-shire , Scotland.
has lithology description: Red sandstone sequence incorporating the Den Siltstone, Kilmuir Conglomerate and Raddery Sandstone Formations.
has thickness description: + 2000m.
has upper boundary definition: Unconformable base of the Balnagown Sandstone Group.

Birkdale Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BKL LMST
broader: Alston Formation

Black Law Plug (Greenock)
type: Concept
in scheme: NamedRockUnit
alternative label: BKLAW
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BKLAW TR
broader: SSDPC

Brickiln Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BKLC
has current status: CURRENT
has theme: BEDRCK
notation: Bk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BKLC COAL
broader: PLCM

Baldernock Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BKLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BKLS LMST
broader: LWM

Black Law Vent And Plug (Jedburgh)
type: Concept
in scheme: NamedRockUnit
alternative label: BKLW
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BKLW AGG
has lithology component: BKLW MGBPMC
has lithology component: BKLW MGBPOM
broader: KELSO

Brinkmarsh Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BKM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Blackmine Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BKMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BKMC COAL
broader: PMCM

Black Metals Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKME
has current status: CURRENT
has theme: BEDRCK
notation: BKME
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42355
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42351
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42352
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42353
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42354
has lithology component: BKME COAL
has lithology component: BKME FEST
has lithology component: BKME MDST
has lithology component: BKME SDST
has lithology component: BKME SEATM
has lithology component: BKME SEATS
has lithology component: BKME SLST
has source info: BKME_49221
has source info: BKME_49255
has source info: BKME_49343
has source info: BKME_50230
has source info: BKME_50943
has source info: BKME_51072
has source info: BKME_51103
has source info: BKME_51445
has source info: BKME_51725
has source info: BKME_51911
has obsolete equivalent: BKME mn 456
broader: LSC
narrower: California Clayband Ironstones
has lower boundary definition: In the Central Coalfield, mudstone of this unit alternates (is interbedded) with sandstone of the overlying Limestone Coal Formation. The boundary is picked at the base of the lowermost bed of coarse siltstone or sandstone (Read, 1965). Locally, the erosive base of the sandstone has cut down into the member or is abruptly overlain by lavas in the Bo'ness area of the Livingston district (Read, 1965). In the Glasgow district the upper boundary of the unit is just below (within about 5m) of the Knott Coal horizon (Hall et al., 1998, fig.11).
has geographical distribution: Central Scotland.
has lithology description: A distinctive thick, laterally persistent dark grey mudstone (Read, 1965), distinguished by one or morebeds, termed "Black Metals Marine Bands" [not to be confused with the Black Metals Marine Band of Cumberland, of Duckmantian age], containing a varied shelly fauna indicative of a marine depositional environment (Wilson, 1967). The member also includes beds with Lingula and beds with a shelly fauna, including Naiadites, indicative of non-marine depositional conditions. Read (1965) describes a commonly recorded sequence within the member of mudstone with Lingula at the base, overlain by mudstone with non-marine bivalves or unfossiliferous mudstone, overlain by mudstone with a varied marine fauna comprising the middle part of the member and overlain by mudstone containing non-marine bivalves. The characteristic lithologies of the member vary laterally within the Midland Valley of Scotland. On the western side of the Central Coalfield in the Glasgow district, strata that comprise the member are described and illustrated by Hall et al. (1997, fig.11) as black and dark grey, carbonaceous mudstones and silty mudstones with characteristic development of brownish grey clayband ironstone nodules (California Clayband Ironstone). Sandstones are restricted to thin beds and comprise two or three metres thickness in a total interval thickness of about 32m. Eastwards from the Central Coalfield the member includes siltstone and sandstone beds that increase progressively in number and thickness to become the predominant lithology; seatearth and coal also appear (Read, 1965). In the western coastal Irvine district, the Logans Bands, thin beds of ironstone in a laterally persistent mudstone sequence containing Lingula and Naiadites or non-marine bivalves (Monro, 1999), have been correlated with the unit in southern and central Ayrshire by Simpson and MacGregor (1932) or Eyles et al. (1949).
has thickness description: The thickness of the unit is described by Read (1965) as exceeding that of the fining-upward cycles, otherwise typical of the Limestone Coal Formation, that are approximately 3m to 10m (10 feet to 30 feet) thick. In the Cardowan No.2 borehole, north of Glasgow on the western side of the Central Coalfield, the full development of the unit is 32.3m thick, from 470m to 502.3m depth (Hall et al., 1997, fig.11). The thickness of the member is similar in the Kincardine basin and the Fife-Midlothian basin. However, in the Kincardine basin in west Fife, the thickness of the member increases eastwards from 33m to a maximum of 66m, associated with the lateral change to an increasingly sandstone-bearing succession (Francis et al., 1970, p.190 and plate VIII).
has upper boundary definition: In the Central Coalfield, the lower boundary of the unit is picked at the top of the Black Metals Basal Coal (Forsyth and Read, 1962). Eastwards the base is picked at the top of a laterally equivalent seatearth and correlated to a thin coal above the Torrance Four-inch Coal farther east in Fife (Read, 1965), fig. 2). Westwards, in the Glasgow district, marine fossils are recorded just above the lower boundary of the Black Metals Member, which is picked at the roof of the Upper Garscadden Coal (Hall et al., 1997, fig.11), where instead blackband ironstone (Upper Garscadden Ironstone) may be developed (Forsyth and Read, 1962).

Blackmires Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BKML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bm
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42356
has lithology component: BKML LMST
has lithology component: BKML MDST
has source info: BKML_49022
has source info: BKML_49323
has source info: BKML_50409
has source info: BKML_50484
broader: Granby Member
has lower boundary definition: Change up from grey calcareous mudstone of undifferentiated Granby Member; 62.40m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it may pass south into part of the Rugby Limestone Member of the Blue Lias Formation (Ambrose, 2001).
has lithology description: Limestone, bioclastic, shelly, grey, weathering brown, laterally persistent. Fauna includes echinoderms, serpulids, bivalves and corals. In type section Borehole F/B5, a single limestone bed was proved; elsewhere in the vicinity up to three similar, closely-spaced beds were proved, of which the highest is most persistent.
has thickness description: 0.3m in type section; up to 2m in Leicestershire
has upper boundary definition: Change up into grey calcareous mudstone of undifferentiated Granby Member; 62.10m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).

Brackenslack Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BKNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Brockley Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BKP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Birk Riggs Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BKR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BKR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: SH
has youngest age: SH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42357
has lithology component: BKR MDHLM
has lithology component: BKR MDST
has lithology component: BKR SDST
has lithology component: BKR SLST
has source info: BKR_49249
has source info: BKR_51423
has source info: BKR_52056
has obsolete equivalent: BKR mn 2545
has obsolete equivalent: BKR mn 1702
broader: TNTH
has lower boundary definition: Conformably overlies the Brathay Formation.
has geographical distribution: Southern Lake District and north-west Pennines.
has lithology description: Sandstone, siltstone and mudstone turbidite with interbedded laminated hemipelagite.
has thickness description: Variable; c.75-380m.
has upper boundary definition: Conformably overlain by the Coldwell Formation.

Black Rake Coal (Nottingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BKRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BKRC COAL
broader: PLCM

Black Rocks Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BKRKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: BKRKS BAOCM
broader: LAFAS

Brook End Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BKS
has current status: CURRENT
has theme: BEDRCK
notation: BKS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42358
has lithology component: BKS SDST
has lithology component: BKS SLST
has source info: BKS_51665
broader: MMG
has lower boundary definition: Imprecise owing to harder mudstone lithologies; sandstone probably no more than c. 0.6m (proved in a borehole), but the magnitude of the feature suggests the horizon forming it is at least 2m thick.
has geographical distribution: Not defined.
has lithology description: Red fine-grained, well cemented sandstone and siltstone, either massive or with well developed bedding (cross bedding and parallel lamination). Overlying and underlying units are both red-brown silty mudstone. Unit includes harder silty mudstone lithologies indistinguishable in field.
has thickness description: 2 - 3 metres (not exposed).
has upper boundary definition: See lower boundary.

Birkhill Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BKSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BKSH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42359
has lithology component: BKSH MDST
has source info: BKSH_48841
has source info: BKSH_49020
has source info: BKSH_51479
has source info: BKSH_52489
has obsolete equivalent: BKSH mn 437
broader: MFS
narrower: Lower Birkhill Shales
narrower: Upper Birkhill Shales
has lower boundary definition: Conformable on Upper Hartfell Shale Formation.
has geographical distribution: Southern Uplands of Scotland and Longford Down Inlier, Northern Ireland.
has lithology description: Black hemipelagic mudstone; grey mudstone with minor wacke sandstone.
has thickness description: 40m
has upper boundary definition: Conformably overlain by wacke sandstones of the Gala Group

Lower Birkhill Shales
type: Concept
in scheme: NamedRockUnit
alternative label: BKSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Birkhill Shale Formation

Upper Birkhill Shales
type: Concept
in scheme: NamedRockUnit
alternative label: BKSU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
broader: Birkhill Shale Formation

Branksome Sand Formation And Selsey Sand Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BKSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GL
has predominant age: GL
has youngest age: GL
has lithology component: BKSY CLAY
has lithology component: BKSY SANDU
has lithology component: BKSY SILT
broader: Bracklesham Group
has lithology description: See the Lithology descriptions for the component formations.

River Terrace Deposits, 2 To 3 (Blackwater)
type: Concept
in scheme: NamedRockUnit
alternative label: BL2T3
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BL2T3 GRAV
has lithology component: BL2T3 SANDU
broader: NE

River Terrace Deposits, 3 (Blackwater)
type: Concept
in scheme: NamedRockUnit
alternative label: BL3
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BL3 GRAV
has lithology component: BL3 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

River Terrace Deposits, 4 (Blackwater)
type: Concept
in scheme: NamedRockUnit
alternative label: BL4
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BL4 GRAV
has lithology component: BL4 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Billingham Anhydrite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLA
has current status: CURRENT
has theme: BEDRCK
notation: BA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: BLA ANHY
broader: ZG

Bowling Alley Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLAC
has current status: CURRENT
has theme: BEDRCK
notation: BA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BLAC COAL
broader: PMCM

Ballachulish Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BLACH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BLACH DIR
has lithology component: BLACH GN
has lithology component: BLACH GNP
has lithology component: BLACH MCGN
has lithology component: BLACH MZDI
has lithology component: BLACH QDI
has lithology component: BLACH QMZDI
broader: Argyll And Northern Highlands Granitic Suite

Bladon Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLAD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BI
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42360
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42361
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42362
has lithology component: BLAD LMST
has lithology component: BLAD MDST
has source info: BLAD_48752
has source info: BLAD_49459
has source info: BLAD_49465
has source info: BLAD_50033
has source info: BLAD_50874
has source info: BLAD_51165
has source info: BLAD_51223
has source info: BLAD_51330
has source info: BLAD_51597
has obsolete equivalent: BLAD mn 477
has obsolete equivalent: BLAD mn 1554
has obsolete equivalent: BLAD mn 2168
has obsolete equivalent: BLAD FMB
broader: WHL
has lower boundary definition: The base of the clay/mudstone marl of the Fimbriata-Waltoni Bed, or more rarely the limestone of the Upper Epithyris Bed where channelled through the Fimbriata-Waltoni Bed,as described in lthe lithological details, in most cases resting sharply on the eroded hardground top surface of pale grey to white wackestone of the Ardley Member of the White Limestone Formation.
has geographical distribution: Around Burford, Oxon, the unit passes westward into the Signet Member of the White Limestone Formation, north eastwood to the Brackley area where it passes into the lower part of the Blisworth Clay. Restricted to 1:50 000 Sheets 218, 219, 236 and 237.
has lithology description: A green and grey clay/mudstone, commonly lignitic and associated with fossiliferous marl of the Fimbriata-Waltoni Bed, succeeded by limestones of the Upper Epithyris Bed, including pale grey to white, more or less fossiliferous micrites, peloidal and shell fragmental marly wackestones or packstones, and minor ooidal grainstones.
has thickness description: Up to about 4m thickness.
has upper boundary definition: A generally sharp, erosive boundary with cross-bedded shell-fragmental ooidal limestone or mudstone of the Forest Marble Formation.

Black Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BLAK
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BLAK COAL
has lateral equivalent: BLAK st 895
broader: NE

Blairfindy Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Bland Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLAND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BLAND COAL
broader: PMCM

Ben Lawers Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42363
has lithology component: BLAS CALPL
has lithology component: BLAS CALSIR
has lithology component: BLAS LMST
has lithology component: BLAS MLMST
has lithology component: BLAS PEGP
has lithology component: BLAS PEL
has lithology component: BLAS PELGP
has lithology component: BLAS PSAMM
has lithology component: BLAS QZITE
has lithology component: BLAS SCH
has source info: BLAS_49440
has source info: BLAS_49952
has source info: BLAS_51786
has source info: BLAS_52396
has obsolete equivalent: BLAS st 101
broader: Easdale Subgroup
has lower boundary definition: Base of calcareous succession overlying the dominantly graphitic Ben Eagach Schist Formation.
has geographical distribution: Tyndrum to the Glen Shee area.
has lithology description: Calcareous schist with thin layers of psammite and hornblende schist with white metacarbonate rock, quartzite and graphitic pelite.
has thickness description: c.700m
has upper boundary definition: Base of dominantly fine-grained amphibolitic succession of the Farragon Volcanic Formation west of Glen Shee. Base of dominantly psammite and semipelitic succession of Ben Lui Schist Formation east of Glen Shee.

Blane Water Silt Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLAW
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42365
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42364
has lithology component: BLAW C
has lithology component: BLAW CZ
has lithology component: BLAW DMTN
has lithology component: BLAW S
has lithology component: BLAW Z
has source info: BLAW_49147
has source info: BLAW_49148
has source info: BLAW_51103
has source info: BLAW_51211
has obsolete equivalent: BLAW mn 486
broader: MVG
has additional age information: Loch Lomond Stadial.
has lower boundary definition: The Blane Water Silt Formation rests with angular unconformity on older Quaternary sediments including on the Gartocharn Till Formation (GATI) inside the Lock Lomond Stadial ice limit and outside on the Wilderness Till Formation of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup). In Strathblane the formation rests on members of the Clyde Clay Formation.
has geographical distribution: The Blane Water Silt Formation is recognised in the lower Endrick valley near its confluence with Loch Lomond and in the Blane Water valley above Strathblane.
has lithology description: The Killearn Borehole (Browne and McMillan, 1989, Plate 1, Figure 8) is the standard section for the Blane Water Silt Formation (0.5-15.61m depth). The typical lithology is of regular interbedded clay and silt forming varves with dark coloured tops. The clays are silty, reddish brown and brownish grey, with grey silt, some sand layers and wisps, and thin beds of diamicton up to 7cm thick. The clay is firm to stiff and of medium to high plasticity. Isolated stones up to 2cm are interpreted as dropstones. Lithological associations of the formation are consistent with deposition of muds on a lake bottom in contact and near to glacier ice.
has thickness description: Veneer to over 15m
has upper boundary definition: The Blane Water Silt Formation is overlain conformably and by glaciotectonically emplaced younger sediments of the Drumbeg Sand and Gravel Formation and Gartocharn Till Formation in the Endrick valley outside and at the Loch Lomond Stadial ice limit. In Strathblane it is exposed at the surface.

Blackheath Beds [See Also Hwh]
type: Concept
in scheme: NamedRockUnit
alternative label: BLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lateral equivalent: BLB HWH
broader: HWH
has lithology description: Pebble beds, locally cemented to form conglomerates, and sands. The pebbles are almost exclusively well-rounded flints, and the sand comprises quartz with flint chips.
has supplementary information: Use of term superseded by Harwich Formation, at least locally. See HWH.
has thickness description: 0 to 12m

Blackband Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BLBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BLBA COAL
broader: SWMCM

Blackstones Band Igneous Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BLBAI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NP

Blocking Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BLBC COAL
has lateral equivalent: BLBC st 76
has lateral equivalent: BLBC st 123
broader: PLCM
has lithology description: The Blocking [Bed] Coal (which corresponds to the Silkstone Coal of South Yorkshire) is a seam of fair quality for domestic purposes, but is usually divided by three dirt partings. It has been worked extensively throughout the district.

Black Bed Ironstone (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BLBI FEST
broader: PLCM
has lithology description: The Black Bed Ironstone has been worked extensively around Bowling, Bierley and Low Moor. It consists of about 3m of mudstone with numerous bands of ironstone nodules, cumulatively about 0.6m. It commonly contains fish and plant remains.

Lower Blaisdon Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
broader: NE

Blake Brow Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BlBr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42366
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42367
has lithology component: BLBR VCBR
has lithology component: BLBR VCSST
has lithology component: BLBR VSSTP
has source info: BLBR_49453
has obsolete equivalent: BLBR mn 484
broader: Deepdale Sandstone Formation
has lower boundary definition: Base of lowest thick unit (c.75m) of breccia and/or pebbly sandstone, resting with probable conformity on sandstone of the Deepdale Sandstone Formation.
has geographical distribution: Hart Crag and Hartsop above How, northeastern Lake District. (Between Grasmere and Patterdale).
has lithology description: Volcaniclastic breccia and pebbly volcaniclastic sandstone with some intercalated volcaniclastic sandstone.
has thickness description: 200m (maximum)
has upper boundary definition: Top of highest thick (c.20 - 30m) unit of breccia and/or pebbly sandstone, overlain by sandstone of the Deepdale Sandstone Formation.

Blue Lias Formation (Hebrides) And Breakish Formation, Interdigitated
type: Concept
in scheme: NamedRockUnit
alternative label: BLBRK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has lithology component: BLBRK LMST
has lithology component: BLBRK MDST
has lithology component: BLBRK SDST
has lithology component: BLBRK SLST
broader: LI
has supplementary information: This is composite unit is necessitated because there is a N-S facies change from shallow-water Breakish Formation [BRKH] (the former Broadford Beds BFB) on Raasay and Skye (though there is also some interdigitation there) to deeper water, alternating limestone and mudstone of the Blue Lias Formation [BLIH] in Morvern and Mull. In Ardnamurchan the 2 facies interdigitate in about 50-50 proportions (Oates 1976, 1978; Hesselbo et al 1998).

Upper Blaisdon Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
broader: NE

Blaeberry Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BLBY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BLBY COAL
broader: NE

Blackcleugh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BLC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BLC LMST
broader: Border Group

Blackchapel Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: BLCC
has current status: CURRENT
has theme: BEDRCK
notation: BlcC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BLCC COAL
broader: LSC

Blue Lias Formation, Charmouth Mudstone Formation And Dyrham Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BLCD
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
has lithology component: BLCD ARLMST
has lithology component: BLCD FEOOL
has lithology component: BLCD FEST
has lithology component: BLCD LMST
has lithology component: BLCD MDST
has lithology component: BLCD PHOST
has lithology component: BLCD SAMDST
has lithology component: BLCD SANDU
has lithology component: BLCD SDST
has lithology component: BLCD SLMDST
has lithology component: BLCD SLST
broader: LI

Blandford Chalk Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLCH
has current status: CURRENT
has theme: BEDRCK
notation: BdCk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42368
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42369
has lithology component: BLCH CAMDST
has lithology component: BLCH CHLK
has source info: BLCH_50378
has source info: BLCH_50625
has source info: BLCH_51473
has source info: BLCH_52006
has source info: BLCH_52347
has obsolete equivalent: BLCH mn 3782
broader: UCK
has lower boundary definition: Change from hard nodular chalk, to firm smooth chalk.
has geographical distribution: Probably continuous across the whole of southern England. Is equivalent to the combined Seaford and Newhaven Chalk of Mortimore, 1986, which may or may not be mappable units.
has lithology description: Firm, smooth, white flinty chalk; some thin marl seams present.
has thickness description: 75 - 90 metres.
has upper boundary definition: Taken just below a marked feature break that is thought to be formed either by a hardground or thick bed of flints. This appears to be the same feature that forms the 'secondary escarpment' of Gaster, 1944, in West Sussex.

Blackford Hill Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42370
has lithology component: BLCK ANDLAV
has lithology component: BLCK BALAVA
has lithology component: BLCK TUF
has source info: BLCK_49223
has source info: BLCK_49427
has source info: BLCK_51017
has source info: BLCK_51146
has source info: BLCK_51443
has source info: BLCK_52986
has obsolete equivalent: BLCK mn 1513
broader: PDH
has lower boundary definition: At base of tuff (where present) overlying trachytes and biotite andesites of Brad Hills Member, otherwise at base of thick pyroxene andesite flow.
has geographical distribution: Blackford Hill, Craigmillar Park Golf Course and King's Buildings campus, Edinburgh.
has lithology description: A thin local bed of tuff (3m), overlain by a thick flow of pyroxene andesite (100m), overlain by thin flows of feldspar-macro porphyritic olivine basalt (30m seen).
has thickness description: At least 130m
has upper boundary definition: Not seen - unconformably overlain by Kinnesswood Formation rocks.

Bath Lodge Coal (Ballycastle, Northern Ireland)
type: Concept
in scheme: NamedRockUnit
alternative label: BLCL
has current status: CURRENT
has theme: BEDRCK
notation: BLCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42371
has lithology component: BLCL COAL
has source info: BLCL_50458
broader: Ballyvoy Sandstone Formation
has lower boundary definition: Rests on coaly shale.
has lithology description: Coal.
has thickness description: 0.45 m.
has upper boundary definition: Overlain by dark shales.

Bull Cliff Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BLCLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JH
broader: STM

Balcomie Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLCM
has current status: CURRENT
has theme: BEDRCK
notation: BLCM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: SYG

Block Coal (South Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BLCO COAL
broader: PMCM

Blue Lias Formation And Charmouth Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BLCR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
has lithology component: BLCR ARLMST
has lithology component: BLCR FEST
has lithology component: BLCR LMST
has lithology component: BLCR MDST
has lithology component: BLCR PHOST
has lithology component: BLCR SDST
has lithology component: BLCR SLST
broader: LI
has lithology description: See the Lithology descriptions for the component formations.

Balachuirn Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BlcS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has lithology component: BLCS SDST
broader: Bearreraig Sandstone Formation

Blind Cove Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLCV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BlCv
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42372
has lithology component: BLCV VCSST
has source info: BLCV_49453
has obsolete equivalent: BLCV mn 494
broader: Deepdale Sandstone Formation
has lower boundary definition: Base (probably conformable) of lowest of a series of thick units (2-25m) of pebbly sandstone, resting on bedded sandstone (undivided) of the Deepdale Sandstone Formation.
has geographical distribution: St Sunday Crag, Thornhow End, Deepdale, northeast Lake District (between Grasmere and Patterdale).
has lithology description: Pebbly volcaniclastic sandstone with intercalations of bedded fine- to coarse-grained volcaniclastic sandstone.
has thickness description: 200m (maximum)
has upper boundary definition: Overlain either by ignimbrite (St Sunday Crag Member) or breccia (Blake Brow Member).

Beinn An Leathaid Granodiorite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BLDG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BLDG GDL
has lithology component: BLDG GDM
broader: Ardnamurchan Centre 1

Ballylagan Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Bleawath Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLEA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42373
has lithology component: BLEA LPTUF
has lithology component: BLEA VCSST
has source info: BLEA_52468
has obsolete equivalent: BLEA mn 491
broader: Borrowdale Volcanic Group
has lower boundary definition: Placed at upward change from sandstone of the Broom Farm Formation to eutaxitic lapilli tuff.
has geographical distribution: Seen in Sellafield boreholes 2 (NY00SE/28), 4 (NY00SE/29), 5 (NY00SE/30), 10A (NY00SW/38).
has lithology description: Massive eutaxitic lapilli-tuffs containing abundant pumice and nonvesiculated juvenile clasts; zoned andesitic to rhyodacitic composition; thin rhyodacite at base; laminated/bedded sandstones separate some igneous units.
has thickness description: c.416m (uncorrected for structural dip or borehole deviation from vertical). 201m, 322m, 200m proved but unbottomed in boreholes 4, 5 and 10A respectively.
has upper boundary definition: At the reworked top of thick, massive welded tuffs at this change to thinner sheets of generally lithic rich lapilli tuffs of the Brown Bank Tuff Formation.

Blackbyre Coal (Glasgow; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BLEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BLEC COAL
broader: LWM

Ben Ledi Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLEG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLGF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42375
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42376
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42374
has lithology component: BLEG MCONG
has lithology component: BLEG MLMST
has lithology component: BLEG MMST
has lithology component: BLEG MSDST
has lithology component: BLEG PEL
has lithology component: BLEG PSAMM
has lithology component: BLEG SDST
has lithology component: BLEG SEMPEL
broader: SOHI
narrower: LDBU
has lower boundary definition: Outgoing of chloritic and epidotic, pale to dark green and grey rocks or outgoing of clean, coarse arenites and incoming of more matrix-rich arenites and wackes.
has geographical distribution: Southern Highland Group outcrop across southern Highlands of Scotland, from Glen Clova and Glen Esk to the Kintyre peninsula, Argyllshire.
has lithology description: Metasandstone, arenite to wacke, pale to dark grey, fine- to very coarse-grained, locally gritty and pebbly, interbedded with semipelite and pelite; contains brown-weathering calcareous nodules in upper part. Generally becomes coarser-grained upwards.
has thickness description: In excess of 2000m (estimated)
has upper boundary definition: Outgoing of chloritic and feldspathic coarse arenites and wackes and incoming of clean arenites (base of Keltie Water Grit and Loch Ard Grit formations).

Blenfire Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLEN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BLEN COAL
has lateral equivalent: BLEN st 122
has obsolete equivalent: BLEN mn 492
broader: PLCM

Bailey's Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLEY
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: BLEY CHRT
has lithology component: BLEY LMST
has lithology component: BLEY MDST
broader: Bampton Limestone Formation

Ballyleighery Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
broader: NE

Belfast Marls Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLFM
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42378
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42379
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42377
has lithology component: BLFM GLMDST
has lithology component: BLFM GLSST
has source info: BLFM_50221
has obsolete equivalent: BLFM mn 380
has obsolete equivalent: BLFM mn 1744
broader: NE
has additional age information: Cenomanian. Mantelliceras mantelli to basal Acanthocerus rhotomagense Zone.
has lower boundary definition: Unconformable, oversteps various older units.
has geographical distribution: East Antrim Basin and Southern Uplands area of Northern Ireland.
has lithology description: Pale grey strongly bioturbated silty marls with a scattering of dark green glauconite grains (not exceeding 40%). Transitional `zone? at the top contains relatively little glauconite. Fossiliferous with concentrations into discreet laterally continuous shell-beds.
has thickness description: Maximum thickness of a little less than 3.0m known from a borehole near Magheramorne [J 433 975] in the Larne (sheet 21) area. Minimum thickness of 1.6m over the Knockagh Axis north of Belfast.
has upper boundary definition: Conformable, junction arbitrarily drawn at the base of the lowest persistent hard calcareous siltstone of the overlying Island Magee Siltstones Formation. This junction appears at the top of a transitional zone showing an upward decrease in glauconite content

Blengdale Glacigenic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLGL
has current status: CURRENT
has theme: SPRFCL
notation: BLG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42381
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42382
has lithology component: BLGL CLAY
has lithology component: BLGL DMTN
has lithology component: BLGL GRAV
has lithology component: BLGL SANDU
has lithology component: BLGL SILT
has source info: BLGL_48926
has source info: BLGL_49633
has source info: BLGL_50151
has source info: BLGL_51754
broader: Central Cumbria Glacigenic Subgroup
narrower: SBTI
narrower: MSYT
narrower: HRTI
narrower: WGGV
narrower: Bark Butts Silts Member
has lower boundary definition: Sharp, irregular, unconformable contact of diamicton on bedrock, or undulating to planar, unconformable contact of diamicton on laminated silt and clay of the Stubble Green Silt or Carleton Hall Clay members of the Glannoventia Formation.
has geographical distribution: Western side of the Lake District and at depth beneath Lower Wasdale.
has lithology description: Interbedded units of gravelly sandy clay diamicton, sand, gravel, silt and clay, typically reddish brown, with clasts mainly of Borrowdale Volcanic Group rocks (rhyolite, welded tuff, slate), granite and granophyre from the Lake District.
has thickness description: To 20m
has upper boundary definition: Ground surface, or sharp, undulating, unconformable contact of diamicton with overlying dark brown laminated clay of the Whinneyhill Coppice Clay Member of the Aikbank Farm Glacigenic Formation.

Balgrochan Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BLGR CAMDST
has lithology component: BLGR LMST
broader: LWM

Ballyboley Halite
type: Concept
in scheme: NamedRockUnit
alternative label: BLH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TA
broader: NE

Bullhead Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BLHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BLHB CLAY
has lithology component: BLHB GRAV
has lithology component: BLHB SANDU
broader: TAB

Burton Lazars Head
type: Concept
in scheme: NamedRockUnit
alternative label: BLHD
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Blair Hill Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLHT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has lithology component: BLHT TUF
broader: East Ogwell Limestone Formation

Blue Lias Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLi
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42383
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42385
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42386
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42387
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42389
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42390
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42384
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42388
has lithology component: BLI LMST
has lithology component: BLI MDST
has lithology component: BLI SDST
has lithology component: BLI SLST
has source info: BLI_49471
has source info: BLI_49476
has source info: BLI_49477
has source info: BLI_50044
has source info: BLI_50045
has source info: BLI_50046
has source info: BLI_50812
has source info: BLI_50962
has source info: BLI_51107
has source info: BLI_51149
has source info: BLI_51519
has source info: BLI_51615
has source info: BLI_52580
has obsolete equivalent: BLI mn 503
has obsolete equivalent: BLI mn 2700
has obsolete equivalent: BLI mn 502
broader: LI
narrower: SASH
narrower: MRGF
narrower: WCT
narrower: PO
narrower: LVN
narrower: STM
narrower: RLS
has lower boundary definition: At the base of grey limestone or mudstone sharply overlying irregular surface of pale grey or bluish and greenish-grey or reddish brown mudstone of the Cotham Member (Lilstock Formation) or eroded, commonly bored, locally conglomeratic surface of pale porcellanous limestone of Langport Member (Lilstock Formation). Coincides with the base of the Lias Group, which is commonly markedly non-sequential.
has geographical distribution: Wessex Basin, Central Somerset Basin, Worcester Basin and adjoining marginal areas (Radstock-Bristol Shelf and South Wales), southern part of the East Midlands Shelf ie. Dorset coast to approximately Leicester.
has lithology description: Thinly interbedded limestone (laminated, nodular, or massive and persistent) and calcareous mudstone or siltstone (locally laminated). Individual limestones are typically 0.10-0.30m thick. In some areas, intervening mudstone units with relatively few limestone beds. Also includes littoral limestone facies of the Radstock Shelf - Mendip area and South Wales.
has thickness description: To c.140m
has upper boundary definition: At the base of the Charmouth Mudstone Formation. In any one section, this coincides with marked upward decrease in abundence of limestone beds, locally associated with marked decrease in their individual thickness and lateral persistence. In many cases, the horizon to be taken is obvious. Where there is doubt; the thickness and vertical frequency of limestone beds should be considered, and the following guidelines used: at top of a more or less persistent, thick (>0.10m) limestone above which the overlying mudstone (beneath any subsequent similar limestone) is at least twice the thickness typical of the underlying limestone-mudstone interbedded unit and above which is no return, within the Lias Group, to limestone-mudstone spacing on that previous scale. In type section, top formerly taken at top of Scipionianum Bed but characteristic interbedded limestone/mudstone sequence continues above that Bed, and that upper boundary in type area should be drawn at a higher stratigraphical level. In Dorset coastal sections, top is at top of Grey Ledge (Bed 49 of Lang, W D, 1924); in Somerset coastal sections, top is at the top of Bed 238 of Whittaker, A and Green, G W, 1983.

Blue Lias Formation (Hebrides)
type: Concept
in scheme: NamedRockUnit
alternative label: BLIH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has lithology component: BLIH LMST
has lithology component: BLIH MDST
broader: LI

Black Limestone (Isle Of Man)
type: Concept
in scheme: NamedRockUnit
alternative label: BLIM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: Bowland Shale Formation
has geographical distribution: Southern Isle of Man

Blackbrook Reservoir Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Blk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42391
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42392
has lithology component: BLK BREC
has lithology component: BLK VCBR
has lithology component: BLK VCMST
has lithology component: BLK VCSLST
has lithology component: BLK VCSST
has source info: BLK_50921
has source info: BLK_51833
has source info: BLK_52376
broader: Blackbrook Group
has lower boundary definition: Sharp contact with South Quarry Breccia Member of the Ives Head Formation.
has geographical distribution: The unit extends from Longcliffe Golf Course south to Benscliffe Wood and then north-east to Grace Dieu Warren.
has lithology description: Green to grey, graded volcaniclastic mudstones, siltstones and sandstones with massive beds of volcaniclastic sandstone and breccia.
has thickness description: c.625m
has upper boundary definition: Sharply overlain by Benscliffe Breccia Member, of the Beacon Hill Tuff Formation.

Black Bass Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLKB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BLKB COAL
broader: NE

Blackcraig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLKC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLKC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42393
has lithology component: BLKC CONG
has lithology component: BLKC SDST
has lithology component: BLKC SLST
has lithology component: BLKC WACKE
has source info: BLKC_52050
has source info: BLKC_52489
broader: Barrhill Group
has lower boundary definition: Interfingers with the Kirkcolm Formation.
has geographical distribution: Southern Uplands of south Scotland.
has lithology description: Massive wacke and conglomerate.
has thickness description: c.1500m
has upper boundary definition: Interfingers with the Kirkcolm Formation.

Blakeney Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLKN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: ZG

Blackstone (Shropshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLKS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: PMCM

Bee Low Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42397
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42395
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42394
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42398
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42396
has lithology component: BLL BA
has lithology component: BLL LMST
has lithology component: BLL TUF
has source info: BLL_49236
has source info: BLL_50361
has source info: BLL_52729
has source info: BLL_52767
has obsolete equivalent: BLL mn 364
has obsolete equivalent: BLL mn 365
has obsolete equivalent: BLL mn 366
broader: PKLM
narrower: Chee Tor Limestone Member
narrower: LMB
narrower: MDA
narrower: ALFL
narrower: RDT
narrower: Bee Low Limestones Formation (Apron-Reef)
narrower: Bee Low Limestones Formation (Knoll-Reef)
has lower boundary definition: Taken where the top of the highest dark micritic or calcilutitic bed of the Woo Dale Limestone Formation is overlain by pale grey limestone of the Bee Low Limestone Formation.
has geographical distribution: Peak District, Derbyshire, UK.
has lithology description: Pale grey, pale brownish grey to grey, fine- to medium-grained calcarenites, thick-bedded with scattered crinoid debris; mainly biosparites, but biopelsparites and pelsparites also occur. Peloidal calcarenites are present in the lower part and the back reef facies. Pedogenic crusts and palaeokarstic features are common on many of the major bedding planes. Towards the apron reef, the limestones become increasingly micritic and poorly bedded, with more peloids and ooids and the local development of conglomeratic limestones.Two volcanic members are present, namely the Ravensdale Tuff and the Lower Miller's Dale Lava.
has thickness description: From 68 to 213m in the Buxton district, with 161.94m measured in the BGS Eyam Borehole.
has upper boundary definition: Taken where the base of the lowest dark limestone bed of the Monsal Dale Limestone Formation overlies the pale grey limestone of the Bee Low Limestone Formation. Volcanic horizons (including the Upper Miller's Dale Lava Member and the Winstermoor Lava Member or equivalent beds of altered clay) intervene locally.

Bee Low Limestones Formation (Apron-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: BLLA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: BLLA LMST
broader: Bee Low Limestone Formation

Bull Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: BLLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BLLC COAL
has obsolete equivalent: BLLC mn 676
broader: RAD

Blackstokes Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Bee Low Limestones Formation (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: BLLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BLLK LMST
broader: Bee Low Limestone Formation

Blackhall Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BLLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLLS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42399
has lithology component: BLLS LMST
has lithology component: BLLS MDST
has source info: BLLS_48669
has source info: BLLS_50157
has source info: BLLS_50158
has source info: BLLS_50667
has source info: BLLS_51021
has source info: BLLS_51867
has source info: BLLS_51950
has obsolete equivalent: BLLS mn 1266
has obsolete equivalent: BLLS mn 2887
has obsolete equivalent: BLLS mn 3074
has obsolete equivalent: BLLS mn 4113
has obsolete equivalent: BLLS mn 881
has obsolete equivalent: BLLS mn 1294
has obsolete equivalent: BLLS mn 2888
has obsolete equivalent: BLLS mn 4471
broader: LLGS
has lower boundary definition: Generally seen as a conformable change from marine mudstone underlying the Blackhall Limestone above a thin coal or seatearth within the Lower Limestone Formation, that forms the top of the Inchinnan Limestone cycle.
has geographical distribution: Throughout the outcrop and subcrop of the Lower Limestone Formation in the Midland Valley of Scotland, but locally absent in Ayrshire and Strathclyde, on highs largely created by the Clyde Plateau Volcanic Formation.
has lithology description: A pale to dark grey, crinoidal, bioclastic, earthy to hard limestone, interpreted to be of marine origin, with thicker occurrences comprising calcareous mudstone and lime mudstone beds, thinly bedded above and massive below. In the Glasgow area, the lower leaf of the limestone is a brownish grey ostracodal limestone.
has thickness description: From 0.45m to 3.70m in the Airdrie, Falkirk and Glasgow districts, whereas in interpreted on-shelf settings such as around Midlothian, it can be 15m to 18m.
has upper boundary definition: Generally seen as a conformable change to thick marine mudstone containing the Neilson Shell Bed fauna that passes up into deltaic arenaceous deposits of the Lower Limestone Formation.

Ballymastocker Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLLY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Ballinamallard Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLM
has current status: CURRENT
has theme: BEDRCK
notation: BLM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42400
has lithology component: BLM MDST
has lithology component: BLM SDST
has lithology component: BLM SLST
has source info: BLM_50650
has source info: BLM_51690
has obsolete equivalent: BLM mn 223
has obsolete equivalent: BLM mn 1262
has lateral equivalent: BLM SHAN
is obsolete equivalent of: BLM SHAN
broader: KILS
has lower boundary definition: Not exposed, presumed to be gradation from underlying Ballyreagh Conglomerate Formation.
has geographical distribution: The south-western part of the Fintona Block, Northern Ireland.
has lithology description: Mudstone; grey-red and purple-red mottled, with micaceous siltstone and thin, fine-grained sandstones.
has thickness description: c.1000 metres.
has upper boundary definition: Not exposed, everywhere faulted out.

Blackrock Marl
type: Concept
in scheme: NamedRockUnit
alternative label: BLMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: NCK

Blackband Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BLMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS
has supplementary information: This code/name combination probably refers to the Lingula Band close to the top of the Scottish Middle Coal Measures Formation in Central Ayrshire.

Blairhall Main Coal (Cowdenbeath)
type: Concept
in scheme: NamedRockUnit
alternative label: BLMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BLMC COAL
broader: LSC

Balmae Grits
type: Concept
in scheme: NamedRockUnit
alternative label: BLMG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Blairhall Main Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BLMO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BLMO COAL
has lateral equivalent: BLMO st 621
broader: LSC

Blackpool Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
has source info: BLMU_52697
broader: LEMU

Black Neuk Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLN
has current status: CURRENT
has theme: BEDRCK
notation: BLN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OP
has predominant age: OP
has youngest age: OP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42401
has lithology component: BLN MDST
has lithology component: BLN SLST
has source info: BLN_50759
has source info: BLN_51456
has source info: BLN_52717
broader: MIF
has additional age information: Late Ordovician, early Ashgill, Pusgillian, complanatus Zone (see Fortey and others, 200, column 77).
has lower boundary definition: Rests on the mudclast conglomerate of the Forge Member of the Mill Formation.
has geographical distribution: The Girvan area of southwest Scotland.
has lithology description: Green and grey silty shales.
has thickness description: c.15m
has upper boundary definition: Overlain by flaggy sandstones and siltstones of the Shalloch Formation.

Black Nore Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BLNS SDST
broader: LORS

Blaen Onnen Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42402
has lithology component: BLO DOLO
has lithology component: BLO LMOOL
has source info: BLO_49797
has source info: BLO_51233
has source info: BLO_51490
has source info: BLO_51672
has obsolete equivalent: BLO mn 339
has obsolete equivalent: BLO mn 2872
broader: Clydach Valley Subgroup
has lower boundary definition: In the Clydach Valley, the base is a sharp, palaeokarstic surface cut in dolostones of the Pantydarren Formation, overlain by basal ooidal grainstones of the Blaen Onnen Oolite Formation. At the type locality, the base is placed at the base of massive ooidal grainstones that overlie a prominent 0.3 to 0.5m-thick rubbly bed of radiating fibrous calcite nodules.
has geographical distribution: Northeast crop of the South Wales Coalfield; its correlation with parts of the Abercriban Oolite Group in the Merthyr Tydfil district is unclear, and thus its known limits extend from Cwar yr Hendre [SO 090 146] east to Craig-y-Gaer [SO 2290 1263]. To the south of the Clydach Valley it becomes dolomitized, but it is present at Craig Quarry [SO 2723 0738] and may be crinoidal dolostone at Gallowsgreen Quarry, Varteg Hill [SO 2662 0677].
has lithology description: Massive medium-grained, ooidal grainstone and crinoidal dolostone.
has thickness description: To 14m
has upper boundary definition: In the Clydach Valley the top is a sharp junction, where fine-grained dolostones of the Coed Ffyddlwn Formation overlie the topmost ooidal grainstones of the Blaen Onnen Oolite Formation. At the type locality, the top is an irregular palaeokarstic surface unconformably overlain by green clay forming the base of the Llanelly Formation.

Blockfield
type: Concept
in scheme: NamedRockUnit
alternative label: BLOC
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BLOC BCSU
has lithology component: BLOC BREC
has lithology component: BLOC NATD
has lithology component: BLOC ROCK
broader: RDEPS
has lithology description: Variable lithology. In-situ or nearly in-situ rock debris of mountainous areas. Openwork, clast-supported accumilation of blocks (>64 mm.) without a cliff or steep slope above as an apparent source. May be active or inactive. [Generic description: 'TMOS' procedures].

Bath Lodge Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLOF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Blaen Onnen Oolite [Obsolete Code: Use Blo]
type: Concept
in scheme: NamedRockUnit
alternative label: BLOO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
broader: Clydach Valley Subgroup

Birdlip Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BpL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42404
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42405
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42403
has lithology component: BLPL CAMDST
has lithology component: BLPL CLAY
has lithology component: BLPL LMOOL
has lithology component: BLPL LMST
has lithology component: BLPL MDST
has lithology component: BLPL SANDU
has lithology component: BLPL SDST
has source info: BLPL_48756
has source info: BLPL_48920
has source info: BLPL_49459
has source info: BLPL_49480
has source info: BLPL_49481
has source info: BLPL_49484
has source info: BLPL_50049
has source info: BLPL_50324
has source info: BLPL_51129
has source info: BLPL_51200
has source info: BLPL_51291
has source info: BLPL_51751
has source info: BLPL_51957
has source info: BLPL_52260
has source info: BLPL_52431
has source info: BLPL_52502
has source info: BLPL_52685
has source info: BLPL_53048
has obsolete equivalent: BLPL mn 1014
has obsolete equivalent: BLPL mn 2593
has obsolete equivalent: BLPL mn 2592
broader: INO
narrower: LECK
narrower: Crickley Member
narrower: Harford Member
narrower: SQAR
narrower: Cleeve Cloud Member
has additional age information: Opalinum Zone to Bradfordensis Zone (and probably Concavum Zone).
has lower boundary definition: Disconformity: change upward from mudstone, sandstone or ironshot limestone of Lias Group into predominantly ooidal limestone sequence as in lithological description.
has geographical distribution: Cotswolds Hills from north Oxfordshire (near Chipping Norton) to northeast South Gloucestershire District. Absent due to overstep by Salperton Limestone Formation in south Cotswolds and in Vale of Moreton area. (See Barron, A J M, et al, 1997, fig.4).
has lithology description: Predominantly pale coloured ooidal limestones of varying types; ferruginous and sandy (Leckhampton Member), pisoidal and shelly (Crickley Member) at the base, unfossiliferous and cross bedded in the middle (Cleeve Cloud Member), shelly and marly in the upper part (Scottsquar Member), uppermost beds include sand and clay (Harford Member).
has thickness description: Typically 40 to 46m; type section c.45m, maximum c.74m (Cleeve Hill area).
has upper boundary definition: Disconformity, generally a hardground: overlain by Aston Limestone Formation where present, or Salperton Limestone Formation.

Blargie Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLQA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: B
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42406
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42407
has lithology component: BLQA PSAMM
has lithology component: BLQA QZITE
has lithology component: BLQA SEMPEL
broader: Creag Liath Psammite
has lower boundary definition: Marked by 5m thick zone of interbanded quartzite and semipelite. Overlies semipelites of the An Stac semipelite and psammite.
has geographical distribution: Central Highlands of Scotland, Laggan, Glen Banchor and Kincraig areas.
has lithology description: Cream to pinkish white quartzite and siliceous psammite with subordinate semipelite.
has thickness description: 0 - 75 m.
has upper boundary definition: Incoming of K-feldspar-bearing psammites of the Creag Liath Psammite.

Bad An Loin Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42408
has lithology component: BLQU PELGP
has lithology component: BLQU PSAMM
has lithology component: BLQU QZITE
has source info: BLQU_51786
has source info: BLQU_52164
has obsolete equivalent: BLQU mn 3207
broader: Creag Leacach Quartzite Formation
has lower boundary definition: Base of cream quartzites stratigraphically above the top of clean white quartzites of the Carn Dubh Quartzite Member.
has geographical distribution: Northern part of Glen Shee district, (Sheet 56W).
has lithology description: Cream quartzite and micaceous psammite.
has thickness description: To 300m
has upper boundary definition: Top of dominantly quartzite succession. Gradational boundary with increasing proportion of graphitic schist into the overlying dominantly graphitic Ben Eagach Schist Formation.

Blenfire Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BLR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BLR SDST
broader: PLCM

Bellringer Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLRC
has current status: CURRENT
has theme: BEDRCK
notation: Be
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BLRC COAL
broader: PMCM

Blackrock Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLRO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Bowmore Sandstone Group

Blair Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLRS
has current status: CURRENT
has theme: BEDRCK
notation: BLRS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42409
has lithology component: BLRS MDST
has lithology component: BLRS SDST
has source info: BLRS_50121
has source info: BLRS_52283
has source info: BLRS_52526
has source info: BLRS_52717
has source info: BLRS_52760
has obsolete equivalent: BLRS mn 481
has obsolete equivalent: BLRS mn 482
broader: Dailly Subgroup
has lower boundary definition: Conformable on the Drumyork Flags Formation.
has geographical distribution: The Girvan area of south-west Scotland.
has lithology description: Yellowish-brown, thinly bedded shales and sandstones containing three graptolite-bearing horizons.
has thickness description: 84 m thick.
has upper boundary definition: Conformably overlain by the Knockgardner Sandstone.

Blue Lias [Obsolete Code: Use Bli]
type: Concept
in scheme: NamedRockUnit
alternative label: BLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TR
has predominant age: TR
has youngest age: TR
broader: NE

Ballasalla Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
broader: NE
has geographical distribution: Southern Isle of Man

Black Shales And Conglomerates
type: Concept
in scheme: NamedRockUnit
alternative label: BLSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Bullerthorpe Lane Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BLSD
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Blackhills Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLSG
has current status: CURRENT
has theme: SPRFCL
notation: BSG
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42410
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42411
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42412
has lithology component: BLSG CLAY
has lithology component: BLSG GRAV
has lithology component: BLSG SANDU
has lithology component: BLSG SILT
has source info: BLSG_49235
has source info: BLSG_50626
has obsolete equivalent: BLSG mn 1723
broader: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: KHLCH
narrower: Auchmeddon Gravel Member
has lower boundary definition: Lies (in part) on the Essie Till Formation, the Whitehills Glacigenic Formation, and on bedrock.
has geographical distribution: From Elgin to Fraserburgh, southwards to New Pitsligo [NJ 880 560].
has lithology description: Glaciofluvial outwash and ice-contact sand and gravel, locally with shell fragments. Silt and clay in local glaciolacustrine pockets.
has thickness description: 30m
has upper boundary definition: Present land surface. Locally overlain by the Arnhash Till Member of the Essie Till Formation.

Black Limestones And Shales
type: Concept
in scheme: NamedRockUnit
alternative label: BLSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bofrishlie Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BLSF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42413
has lithology component: BLSL AMPHB
has lithology component: BLSL CHRT
has lithology component: BLSL PEL
has lithology component: BLSL PSAMM
has lithology component: BLSL SLTE
has source info: BLSL_50886
has obsolete equivalent: BLSL mn 467
broader: Highland Border Complex
has lower boundary definition: Incoming of dominant black slate and chert and the outgoing of pale arenites at top of Loch Ard Grit Formation. Probable faulted contact with Dalradian.
has geographical distribution: Southwest of Aberfoyle and northwest of the Highland Boundary Fault; not known beyond western margin of Sheet 35E.
has lithology description: Slate, black, graphitic, with pyrite and locally abundant chert laminae, and subordinate grey and pale green arenite near top. Lenses of spilite and amphibolite occur locally. Locally fossiliferous with a brachiopod faunal assemblage.
has thickness description: 600m maximum
has upper boundary definition: Appearance of carbonated serpentinite and jasper-rich rock of the Lime Hill Serpentinite; contact probably faulted.

Braemore Lodge Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BLSS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42414
has lithology component: BLSS MDST
has lithology component: BLSS SDST
has lithology component: BLSS SLST
has source info: BLSS_48766
has source info: BLSS_52913
has obsolete equivalent: BLSS mn 569
has lateral equivalent: BLSS STS
has obsolete equivalent: BLSS mn 570
broader: OA
has lower boundary definition: Unconformable contact onto crystalline basement rocks or conformable contact onto the Langwell Conglomerate Member of the Ousdale Arkose Formation.
has geographical distribution: Scotland Sheet 109E (Western part of Berridale outlier only known at present) may extend onto Sheets 103W Golspie, 103E Helmsdale and 110 Latheron.
has lithology description: Sandstone, flaggy, red, purple or green.
has thickness description: To 150m
has upper boundary definition: Conformable with the base of the Braemore Mudstone Formation.

Blackstone (Jurassic)
type: Concept
in scheme: NamedRockUnit
alternative label: BLST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
has lithology component: BLST ARLMST
broader: KC

Ben Loyal Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BLSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Blue Tour Coal (Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BLT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BLT COAL
broader: ULGS

Bellscamphie Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLTI
has current status: CURRENT
has theme: SPRFCL
notation: BLT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42415
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42416
has lithology component: BLTI CLAY
has lithology component: BLTI DMTN
has lithology component: BLTI GRAV
has lithology component: BLTI SANDU
has source info: BLTI_49990
has source info: BLTI_50456
has source info: BLTI_50626
has obsolete equivalent: BLTI mn 2102
broader: East Grampian (Albion) Glacigenic Subgroup
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Probably widespread over central Buchan and as pockets to the south and east (beneath Logie-Buchan Glacigenic Subgroup).
has lithology description: Diamicton, stony, sandy, strong brown or yellowish brown. Mostly rock types derived short distance to the northwest. Locally containing flint and quartzite from the Buchan Ridge Gravels.
has thickness description: 2m or more
has upper boundary definition: Unconformable with Pitlurg Till Formation or other, younger glacial or glaciofluvial deposits.

Bottom Little Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BLTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BLTL LMST
broader: MG

Bulthy Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLTY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NP

Ben Lundie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Blue Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BLUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
broader: NE

Ben Lui Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLUS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42417
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42418
has lithology component: BLUS MLAVA
has lithology component: BLUS MLMST
has lithology component: BLUS MSDST
has lithology component: BLUS MTUF
has lithology component: BLUS PSAMM
has lithology component: BLUS QZITE
has lithology component: BLUS SEMPEL
has source info: BLUS_49440
has source info: BLUS_51786
has source info: BLUS_52396
has obsolete equivalent: BLUS mn 394
broader: Crinan Subgroup
narrower: Corrydon Psammite Member
narrower: Golan Well Pebbly Psammite Member
narrower: Duchray Hill Gneiss Member
has lower boundary definition: Top of hornblendic rocks of the underlying Farragon Volcanic Formation or calcareous rocks of Ben Lawers Schist Formation.
has geographical distribution: Ben Lui to Glen Isla.
has lithology description: Dominantly schistose to gneissose semipelite. Psammite locally developed in lower parts and pebbly psammite and psammite locally developed at top.
has thickness description: Not known.
has upper boundary definition: Base of calcareous lithologies of the Loch Tay Limestone Formation.

Broad Law Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BLV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42419
has source info: BLV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Black Vein Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BLVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: BLVC COAL
broader: NE

Blackwater Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BLWA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEBAS

Blackwater Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLWF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: BLWF LMST
broader: NE

Blackwater Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLWR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42421
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42420
has lithology component: BLWR MLAVA
has lithology component: BLWR MTUF
has lithology component: BLWR PEL
has lithology component: BLWR QZITE
has lithology component: BLWR SEMPEL
has lithology component: BLWR WACKE
has source info: BLWR_49798
has source info: BLWR_52234
broader: Argyll Group
narrower: Ardwell Bridge Basic Volcanic Member
narrower: Corinacy Pelite Member
narrower: KHUV
narrower: LYBV
narrower: Grumack Hill Quartzite Member
has lower boundary definition: Faults and shear-zones of the Portsoy Lineament truncate base of formation along the whole of its strike length.
has geographical distribution: Between the Black Water and the headwaters of the River Deveron and on both sides of the Deveron Valley between Bridgend and Lynebain in an outcrop up to 3km wide. Cabrach area, Moray District. 1:50 000 Sheets 75E, 85E and 86W.
has lithology description: Greywacke grits, phyllitic pelites and andalusite bearing semipelites; quartzites; basic and ultramafic meta volcanic rocks.
has thickness description: 2500 m (based on outcrop width only - no allowance for probable folding).
has upper boundary definition: Base of highly magnetic biotite-andalusite-schist easily mapped and/or traced by magnetometer between NJ 405 312 and NJ 441 351 (the Garnel Burn Member of the Clashindarroch Formation).

Balleys Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BLYB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Blaguegate Yard Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BLYC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: BgY
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BLYC COAL
broader: NE

Blyth Coal (Nottingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BLYCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BLYCO COAL
has lateral equivalent: BLYCO st 557
broader: PUCM

Braslyd Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BLYD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BLYD COAL
broader: SWMCM

Ballytrea Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLYT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has obsolete equivalent: BLYT mn 4449
broader: Belfast Group

Blakeney Valleys Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLYV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42422
has lithology component: BLYV C
has lithology component: BLYV P
has lithology component: BLYV S
has lithology component: BLYV V
has lithology component: BLYV Z
has source info: BLYV_49109
broader: YCAT
has additional age information: Mid Pleistocene to Holocene.
has lower boundary definition: Unconformable on glacial and solifluction deposits and on Crag Group and Chalk Group bedrock.
has geographical distribution: North Norfolk, north of the watershed defining the catchment of the River Bure.
has lithology description: The formation encompasses the fluvial, lacustrine and organic deposits of the rivers that flow into the North Sea along the coast of north Norfolk. It includes floodplain alluvium and a restricted development of river terrace deposits. The floodplain alluvium comprises soft clays, silt and fine-grained sands, with bodies of peat, overlying fine- to coarse-grained sands and gravels. River terrace deposits are largely gravel and sand. The gravels are dominated by subangular to rounded flint, including large cobbles, but also include rounded pebbles pf quartz and quartzite, northern British erratics of glacial derivation, and a little chalk.
has thickness description: c.5m
has upper boundary definition: Surface.

Barr Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BLZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42424
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42423
has lithology component: BLZ CAMDST
has lithology component: BLZ LMST
has source info: BLZ_51197
has source info: BLZ_51924
has source info: BLZ_52005
has source info: BLZ_52329
has source info: BLZ_52543
has obsolete equivalent: BLZ mn 4681
has obsolete equivalent: BLZ mn 257
broader: NP
has lower boundary definition: Gradational increase in thickness and number of limestone beds from underlying Buildwas Formation.
has geographical distribution: South Staffordshire.
has lithology description: Grey, micritic limestone interbedded with grey mudstone containing large calcareous nodules.
has thickness description: 9-10m at Walsall
has upper boundary definition: Gradational decrease in thickness and number of limestone beds to overlying Coalbrookdale Formation.

Belemnite Marl Member
type: Concept
in scheme: NamedRockUnit
alternative label: BM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42425
has lithology component: BM CAMDST
has lithology component: BM MDST
has source info: BM_49471
has source info: BM_50891
has source info: BM_52641
has source info: BM_52934
has obsolete equivalent: BM mn 378
has obsolete equivalent: BM mn 377
has obsolete equivalent: BM mn 4010
broader: Charmouth Mudstone Formation
has lower boundary definition: Base of hummocky limestone (base of bed 103 of Lang, W D, et al, 1922). Pale grey colour of Belemnite Marl Member contrasts strongly in cliffs with darker underlying Black Ven Marl Member. Non sequence at base between Sinemurian and Pliensbachian stages.
has geographical distribution: Southwest Dorset; mapped on sheet 327 (Bridport). Northern Limit not yet proved.
has lithology description: Pale grey and dark grey interbedded calcareous mudstones with abundant belemnites at many levels.
has thickness description: 20 to 27m in coastal sections.
has upper boundary definition: Top of Belemnite Stone (top of bed 121 of Lang, W D, et al, 1923). Conformable junction with Green Ammonite Member.

Broxburn Marls
type: Concept
in scheme: NamedRockUnit
alternative label: BMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Broughton Moor Formation And Appletreeworth Volcanic Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BMAV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NA

Bembridge Marls Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMBG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GO
has predominant age: GO
has youngest age: GO
has lithology component: BMBG CAMU
has lithology component: BMBG CLAY
broader: Bembridge Beds
narrower: Lower Bembridge Marls
narrower: Upper Bembridge Marls
has geographical distribution: Isle of Wight.

Lower Bembridge Marls
type: Concept
in scheme: NamedRockUnit
alternative label: BMBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GO
has predominant age: GO
has youngest age: GO
broader: Bembridge Marls Formation
has geographical distribution: Isle of Wight.

Upper Bembridge Marls
type: Concept
in scheme: NamedRockUnit
alternative label: BMBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GO
has predominant age: GO
has youngest age: GO
broader: Bembridge Marls Formation
has geographical distribution: Isle of Wight.

Ballymagarry Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42426
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42427
has lithology component: BMC CHLK
has lithology component: BMC FLNT
has source info: BMC_52106
has obsolete equivalent: BMC mn 231
broader: UWLF
has additional age information: Campanian. Belemnitella mucronata Zone sensu lato.
has lower boundary definition: Conformably overlies the Portrush Chalk Formation at a level of a well-marked bedding plane immediately below the inception of large flat lying and near continuous flint nodules.
has geographical distribution: Absent from the Highland Border High and East Antrim Basin presumably by pre-Palaeogene erosion.
has lithology description: Limestone (chalk) with extremely large flat lying and near-continuous flint bands. Divided into three `Beds? (A to C) separated by well-marked bedding planes.
has thickness description: 10.95m at its type-site.
has upper boundary definition: Marked by the base of the prominent continuous flint band termed the Long Gilbert Flint Band within the Tanderagee Chalk Formation.

Barytes Mine Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BMCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BMCG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42428
has lithology component: BMCG CONG
has source info: BMCG_50545
has obsolete equivalent: BMCG mn 279
broader: SXS
has lower boundary definition: Contact above and below with the Sannox Siltstone Formation.
has geographical distribution: Isle of Arran.
has lithology description: Conglomerate comprised of predominatly quartzite boulders.
has thickness description: 8 m thick.
has upper boundary definition: Contact above and below with the Sannox Siltstone Formation.

Badcall Meta-Clinopyroxene-Norite Subswarm
type: Concept
in scheme: NamedRockUnit
alternative label: BMCN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: UW
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AL
has predominant age: AL
has youngest age: AL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42429
has lithology component: BMCN MCPXNO
has source info: BMCN_50198
has source info: BMCN_50199
has source info: BMCN_51439
has source info: BMCN_52862
has obsolete equivalent: BMCN mn 3776
has obsolete equivalent: BMCN mn 3069
broader: SCOUR
has lower boundary definition: N/a
has geographical distribution: The dykes of the Badcall Meta-clinopyroxene-norite Subswarm are found in a few localities in Assynt and at Badcall.
has lithology description: The Badcall meta-clinopyroxene-norites form a small number of dykes in Assynt and near Scourie. They are coarse-grained and have distinct chilled margins. They have a primary mineralogy of plagioclase-hypersthene-clinopyroxene-biotite plus minor olivine or quartz, with the clinopyroxenes having been replaced by amphiboles at the margins of some dykes. They have lower Ti, but higher Mg and Cr contents than the dolerite dykes of the Scourie Dyke Swarm.
has thickness description: 1m - 100m
has upper boundary definition: N/a

Bassy Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BMCO
has current status: CURRENT
has theme: BEDRCK
notation: BM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BMCO COAL
has obsolete equivalent: BMCO mn 313
has lateral equivalent: BMCO st 86
broader: PLCM

Builth Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BMd
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42430
has lithology component: BMD SLMDST
broader: NP
has lower boundary definition: In-coming of pervasively laminated silty mudstones gradationally overlying the Dolfawr Mudstones, or sharply overlying the Alpine Bridge Member of the Cerig Formation.
has geographical distribution: Central Wales and Welsh Borders.
has lithology description: Laminated silty mudstones.
has thickness description: Not yet assessed.
has upper boundary definition: Not yet diagnosed.

Black Metals Marine Band [Local Term: See Htmb]
type: Concept
in scheme: NamedRockUnit
alternative label: BMET
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BMET MDST
has lithology component: BMET SHMDST
has source info: BMET_49180
has lateral equivalent: BMET HTMB
broader: PMCM
has geographical distribution: Local name applied to the Haughton Marine Band (National Standard Name) in the Cumberland Coalfield area.

Borth Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NP

Brimham Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BMG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: BMG SDST
broader: NE

Lower Bentham Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BMGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Upper Bentham Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BMGU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Black Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BMIC
has current status: CURRENT
has theme: BEDRCK
notation: BI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BMIC COAL
has lateral equivalent: BMIC st 112
has obsolete equivalent: BMIC mn 457
has lateral equivalent: BMIC st 668
broader: PLCM

Bank Moor Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: YORE

Blaen Myherin Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Cwmystwyth Grits Group

Balmore Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BMMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BMMB SHMDST
broader: LWM

Bottom Main Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BMNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BMNC COAL
broader: PMCM

Bellman Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BMNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42443
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42442
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42441
has lithology component: BMNL LMST
has source info: BMNL_49284
has source info: BMNL_50133
has source info: BMNL_50767
has obsolete equivalent: BMNL mn 3695
broader: Clitheroe Limestone Formation
has lower boundary definition: Taken at the base of the lowest Waulsortian limesotne above the packstones and grainstones of the Peach Quarry Limestone Member. Where the latter is absent, the base of the member rests conformably upon dark grey fissile mudstones and packstones of the "Upper Coplow Shales".
has geographical distribution: Craven Basin, limited to the Clitheroe Anticline [SD 74] and northern limb of the Whitewell Antivline [SD 64].
has lithology description: Waulsortian biohermal limestones with subordinate packstones,wackestones and grainstones.
has thickness description: Up to 800 m thick.
has upper boundary definition: The Waulsortian limestones are overlain unconformably by mudstones of the Hodder Mudstone Formation.

Beaumont Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BMNT
has current status: CURRENT
has theme: BEDRCK
notation: Bmnt
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BMNT COAL
has lateral equivalent: BMNT st 406
has lateral equivalent: BMNT st 598
broader: PLCM

Ballymoney Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMNY
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GC
has predominant age: GC
has youngest age: GC
broader: LNG

Bellmoor Member
type: Concept
in scheme: NamedRockUnit
alternative label: BMO
has current status: CURRENT
has theme: BEDRCK
notation: BMO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42444
has lithology component: BMO SDST
has source info: BMO_48694
has source info: BMO_50759
has source info: BMO_52760
has obsolete equivalent: BMO mn 2097
broader: Balclatchie Formation
has additional age information: Late Ordovician (Mid Caradoc).
has lower boundary definition: Taken at base of sandstone lithology, resting on Benan Conglomerate Formation (of Barr Group).
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Greywacke sandstones.
has thickness description: 90 to 140m
has upper boundary definition: Taken at top of sandstone lithology, beneath Kilranny Conglomerate Member (of Balclatchie Formation).

Bottom Moorland Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BMOR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BMOR COAL
broader: PMCM

Bembridge Oyster Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BMOY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GO
has predominant age: GO
has youngest age: GO
broader: Bembridge Beds
has geographical distribution: Isle of Wight.

Beannach Metapicrite Subswarm
type: Concept
in scheme: NamedRockUnit
alternative label: BMP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: UW
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AL
has predominant age: AL
has youngest age: AL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42445
has lithology component: BMP MPCT
has lithology component: BMP MPDT
has source info: BMP_49065
has source info: BMP_50198
has source info: BMP_50199
has source info: BMP_52862
has obsolete equivalent: BMP mn 622
broader: SCOUR
has lower boundary definition: N/a
has geographical distribution: The dykes of the Beannach Picrite Subswarm are part of the Lewisian Gneiss Complex and only occur within it. They have only been mapped as a separate subswarm in the Assynt area where they occur between Glen Canisp and Scourie.
has lithology description: The Beannach Picrite Subswarm comprises the Mg-rich members of the Scourie Dyke Swarm. The dykes of the subswarm are most abundant within the Lewisian Gneiss Complex in the Assynt region, where they are found to the north of the Canisp Shear Ztne. They typically have a broadly east-west trend.The dykes of the subswarm are mostly coarse-grained, texturally hererogeneous and lacking in chilled margins.In composition they are picritic and have the primary mineralogy olivine - orthopyroxene - clinopyroxene - plagioclase - phlogopite - chromite. The dyles of eht Beannach Metapicrite Subswarm clearly post-date the majority of the metadolerites of the Scourie Dyke Swarm, although they are cross-cut by some late dolerites. One dyke of the subswarm has been dated at 2418 +7/-4 Ma (Heaman & Tarney, 1989).
has thickness description: 1m -100m.
has upper boundary definition: N/a

Beinn Mheadhoin Pebbly Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMPP
has current status: CURRENT
has theme: BEDRCK
notation: BM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42447
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42448
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42446
has lithology component: BMPP PSAMM
has lithology component: BMPP QZITE
has lithology component: BMPP SEMPEL
has source info: BMPP_50102
has obsolete equivalent: BMPP mn 1671
broader: Glenshirra Subgroup
has lower boundary definition: Not exposed; unknown.
has geographical distribution: Central Highlands of Scotland E of Great Glen fault - Strathnairn area. Sheet 73E (Foyers).
has lithology description: Feldspathic psammite (arkosic) with thin semipelite beds and gritty beds with abundant quartz and feldspar clasts.
has upper boundary definition: Conformably overlain by Ruthven Semipelite Formation, sharp disconformity and marked lithological change from psammitic sequence to gneissose semipelite.

Broughton Moor Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMR
has current status: CURRENT
has theme: BEDRCK
notation: BMr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42449
has lithology component: BMR LMST
has source info: BMR_49042
has source info: BMR_50855
has source info: BMR_52930
has source info: BMR_52944
has obsolete equivalent: BMR mn 4613
broader: Dent Group
has lower boundary definition: Unconformable, but local evidence of continuous deposition from the underlying Torver Member with an horizon of chamositic ooliths at the junction passing up in places into a thin, laminated black shale in the lower part of the Broughton Moor Formation.
has geographical distribution: The outcrop extends from Limestone Hill in the east (NY 3405 0044) to Hobkin Ground Wood (SD 2297 9125) near Broughton Mills in the west. It is about 4 m thick across its whole outcrop so is too narrow to show on 50k map sheets, but is shown combined with the Appletreeworth Volcanic Formation on the 25k special Sheet of Coniston Fells.
has lithology description: Interbedded nodular and bioturbated micritic limestones.
has thickness description: From 4 m to 6 m thick.
has upper boundary definition: Sharp and conformable with the overlying Appletreeworth Formation.

Bromsgrove Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BmS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42452
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42450
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42451
has lithology component: BMS MDST
has lithology component: BMS SDST
has lithology component: BMS SLST
has source info: BMS_48671
has source info: BMS_49873
has source info: BMS_51674
has source info: BMS_52614
has source info: BMS_52749
has obsolete equivalent: BMS mn 2202
broader: SSG
narrower: SHSA
has lower boundary definition: Disconformable on Wildmoor Formation or older formations; taken at base of lowest pebbly bed with chips of unweathered feldspar (Wills, 1976 p.37,99) at outcrop in type area.
has geographical distribution: Stafford and Worcester basins.
has lithology description: Sandstones, red, brown and grey, commonly pebbly or conglomeratic at the bases of beds, interbedded with red and brown siltstones and mudstones.
has thickness description: 0->300m (Redditch area), 15-40m (Stoke-on-Trent area), c.500m (Worcester area).
has upper boundary definition: Transitional at base of Mercia Mudstone Group.

Burn Of Mar Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BMSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42453
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42454
has lithology component: BMSA SDST
has source info: BMSA_49598
has source info: BMSA_50440
has source info: BMSA_52021
has source info: BMSA_52326
has source info: BMSA_52708
has obsolete equivalent: BMSA mn 1989
has obsolete equivalent: BMSA mn 1990
has obsolete equivalent: BMSA mn 2457
broader: Highland Border Complex
has lower boundary definition: Not seen, as either faulted against younger or older rocks, or juxtaposed against sheared and silicified serpentinite.
has geographical distribution: Isolated slivers within the Highland Boundary Fault system between Loch Lomond (Balmaha) and Gualann. 1:50k sheets 38W (Ben Lomond) and 38E (Aberfoyle).
has lithology description: A medium to coarse-grained and weakly cleaved, lithic sandstone arenite, which contains chloritised grains, possibly after serpentine, and chromite grains.
has thickness description: At least 200 m thick.
has upper boundary definition: Not seen, as either faulted or unconformably overlain by Upper Devonian, Upper Old Red Sandstone Facies strata.

Barnham Silt And Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BMSC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QX
has predominant age: QX
has youngest age: QX
broader: NE

Bromfield Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BMSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: BMSG GRAV
has lithology component: BMSG SANDU
has source info: BMSG_51340
broader: NE
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic desciption].

Brimham Shale
type: Concept
in scheme: NamedRockUnit
alternative label: BMSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Black Mountain Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: BMSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BMSM MDST
broader: Dergvone Shale Formation

Black Metal Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: BMT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BMT COAL
broader: PMCM
has geographical distribution: Cumberland Coalfield area.

Bearsmouth Or Thorneyburn Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BMTBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BMTBC COAL
has lateral equivalent: BMTBC st 752
broader: Border Group

Brown Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNB
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: BNB CLAY
has lithology component: BNB SANDU
has source info: BNB_49262
has obsolete equivalent: BNB mn 637
broader: NE
narrower: SEHA
has lower boundary definition: Overlies Eemian Marine Sands in type area, also overlies early and middle Pleistocene sediments (unconformably) in British sector.
has geographical distribution: Not defined.
has lithology description: Brackish-marine, grey-brown silty clays. Pass upwards into lacustrine clays in the east, include interbeds gravelly sand towards base in west. Extensively bioturbated, locally cryoturbated.
has thickness description: 0 - 10m. (maximum 25m. in British Sector of Flemish Bight).
has upper boundary definition: Overlain by Holocene Marine Sands or (locally) Weichselian Periglacial Sands (Twente Formation).

Bidean Nam Bian Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Glencoe Volcanic Formation

Banton Blackband Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNBC COAL
broader: LSC

Brownber Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNBF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BBF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has lithology component: BNBF DOLMST
has lithology component: BNBF DOLO
has lithology component: BNBF LMST
has lithology component: BNBF SDST
has source info: BNBF_49266
has source info: BNBF_51706
has obsolete equivalent: BNBF mn 642
broader: Great Scar Limestone Group
has additional age information: Chadian or Arundian.
has lower boundary definition: Not defined.
has lithology description: Interbedded sandstones (fine-grained, pale brown, laminated in part), limestones (calcarenites grainstones, ooidal in part) and dolomites (yellow, flaggy) containing abundant quartz pebbles near top (between underlying and overlying dark grey bioclastic limestones of the Coupland Sike and Breakyneck Scar limestones respectively).
has thickness description: 15 metres, which is approx. thickness to neighbourhood of Raisbeck, beyond which it thickens to c.80 metres at west edge of NY60NW where it is a largely hard, laminated sandstone formation.
has upper boundary definition: Not defined.

Banton Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BNBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNBI FEST
broader: LSC

Benburb Lignite
type: Concept
in scheme: NamedRockUnit
alternative label: BNBL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QX
has predominant age: QX
has youngest age: QX
has lithology component: BNBL GRAV
has lithology component: BNBL PEAT
broader: NE
has lithology description: Lignite with rare gravel; interglacial in origin. [Generic description: academic papers and BGS Memoirs].

Barnby Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNBM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bby
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: JH
has youngest age: JH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42455
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42456
has lithology component: BNBM ARLMST
has lithology component: BNBM CAMDST
has lithology component: BNBM MDST
has source info: BNBM_49323
has source info: BNBM_51195
has source info: BNBM_51753
has obsolete equivalent: BNBM mn 91
has obsolete equivalent: BNBM mn 90
has obsolete equivalent: BNBM mn 250
broader: SMD
has lower boundary definition: Top of highest limestone bed in Barnstone Member.
has geographical distribution: East Midlands Shelf area: South Yorkshire to north flank of London Platform.
has lithology description: Grey calcareous mudstones with rare thin argillaceous limestones comprising c.1% of the sequence.
has thickness description: 22.05 metres in borehole F/B5 (SK95SW/17).
has upper boundary definition: Base of lowest (unnamed) limestone bed in Granby Member (see references for details of beds within members).

Banbury Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BNBR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNBR SDST
broader: NE

Benan Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BNC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42457
has lithology component: BNC CONG
has lithology component: BNC SDST
has source info: BNC_48694
has source info: BNC_52655
has source info: BNC_52760
broader: Barr Group
has lower boundary definition: Locally erosive contact with Stinchar Limestone Formation, basal beds are laterally equivalent to the Superstes Mudstone Formation.
has geographical distribution: North side of the Stinchar Valley, Girvan district. Lower part is lateral equivalent of Superstes Mudstone Formation.
has lithology description: Boulder conglomerate.
has thickness description: 50-750m
has upper boundary definition: Overlain by Balclatchie Formation.

Banton Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BNCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNCB FEST
broader: LSC

Bench Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNCC COAL
broader: PLCM

Beinn Na Cro Gabbro (Skye Eastern Red Hills Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: BNCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BNCG GB
broader: REDHE

Bench Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNCH COAL
broader: PLCM

Bryn Nicol Formation, Coed Ifan Facies
type: Concept
in scheme: NamedRockUnit
alternative label: BNCIF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: Bryn Nicol Formation

Beinn Churalain Quartzite
type: Concept
in scheme: NamedRockUnit
alternative label: BNCN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BNCN QZITE
broader: Islay Subgroup

Bin Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNCO
has current status: CURRENT
has theme: BEDRCK
notation: BIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BNCO COAL
has lateral equivalent: BNCO st 107
has obsolete equivalent: BNCO mn 429
broader: NE

Bannisdale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BND
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BND
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42458
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42459
has lithology component: BND LMST
has lithology component: BND MDST
has lithology component: BND SDST
has lithology component: BND SLMDST
has lithology component: BND SLST
has source info: BND_49249
has source info: BND_51300
has source info: BND_51423
has source info: BND_52056
has obsolete equivalent: BND mn 244
broader: KNDL
narrower: RSD
has lower boundary definition: Conformably overlies the Coniston Group (Yewbank Formation).
has geographical distribution: Southern Lake District and Northwest Pennines.
has lithology description: Silty mudstone with subordinate siltstone and sandstone.
has thickness description: c.3000m
has upper boundary definition: Conformably overlain by the Underbarrow Formation.

Bone Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNEC
has current status: CURRENT
has theme: BEDRCK
notation: Bn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNEC COAL
broader: PLCM

Bottom Neddy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNED
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNED COAL
has lateral equivalent: BNED st 247
has lateral equivalent: BNED st 248
has obsolete equivalent: BNED st 132
has lateral equivalent: BNED st 133
broader: PLCM

Ben Nevis Complex (Inner Granite)
type: Concept
in scheme: NamedRockUnit
alternative label: BNEV1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BNEV1 MCGDL
broader: Ben Nevis Complex

Ben Nevis Complex (Outer Granite)
type: Concept
in scheme: NamedRockUnit
alternative label: BNEV2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BNEV2 GD
broader: Ben Nevis Complex

Ben Nevis Complex (Marginal Intrusion) (Pyroxene Diorite To Granodiorite)
type: Concept
in scheme: NamedRockUnit
alternative label: BNEV3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BNEV3 GD
has lithology component: BNEV3 PXDI
has lithology component: BNEV3 TO
broader: Ben Nevis Complex

Ben Nevis Complex (Marginal Intrusion) (Quartz Diorite)
type: Concept
in scheme: NamedRockUnit
alternative label: BNEV4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: BNEV4 QDI
broader: Ben Nevis Complex

Barras Nose Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BNF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42461
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42460
has lithology component: BNF LAVA
has lithology component: BNF LMST
has lithology component: BNF MDST
has lithology component: BNF SDST
has lithology component: BNF SLST
has lithology component: BNF TUF
has source info: BNF_48932
has source info: BNF_50013
has source info: BNF_50057
has source info: BNF_50823
has source info: BNF_51556
has source info: BNF_51557
has obsolete equivalent: BNF mn 260
has obsolete equivalent: BNF mn 2515
broader: TEVY
has lower boundary definition: The depositional lower boundary is not seen as the lower boundary is everywhere tectonic.
has geographical distribution: Occurs between the Boscastle/Tintagel area (SX 07 89), north Cornwall and the Launceston area (SX 30 78), east Cornwall. The outcrop in east Cornwall (BGS, 1993) needs further investigation.
has lithology description: Dark grey and black mudstones with variably abundant very thin beds and laminae of cross laminated and graded silstone and sandstone. The mudstones contain scattered sideritic, carbonaceous silty sandstone and argillaceous limestone nodules, containing goniatites. A thin fossiliferous limestone is present at or very near the top of the Formation. Volcanic material locally occurs as lenses of sheared vesicular lava and tuff.
has thickness description: 21m+ on the coast in the Boscastle/Tintagel area; poorly constrained as a result of deformation.
has upper boundary definition: The upper boundary is taken at the sharp contact of tuffs, lavas and agglomerates of the overlying Tintagel Volcanic Formation with the mudstones and thin siltstones of the Barras Nose Formation.

Burnfoot Shales
type: Concept
in scheme: NamedRockUnit
alternative label: BNFS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CZ
broader: NE

Bu Ness Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42462
has lithology component: BNG CONG
has lithology component: BNG MDST
has lithology component: BNG PESST
has lithology component: BNG SDST
has lithology component: BNG SLST
has source info: BNG_49357
has source info: BNG_52293
has obsolete equivalent: BNG mn 652
broader: Fair Isle Group
has lower boundary definition: Drawn at the base of the Bu Ness Sandstone Formation where sandstone alternating with siltstone conformably rests upon thin co-sets of sandstone and thick co-sets of fine-grained sediments of the Observatory Sandstone Formation.
has geographical distribution: Fair Isle, Shetland Islands.
has lithology description: Grey to buff red-stained arkosic sandstone, pebbly grit and conglomerate, siltstone and mudstone.
has thickness description: c.200m
has upper boundary definition: Drawn at the conformable upward passage of Upper Pebbly Grit of the Bu Ness Sandstone Formation, which is not overlain.

Bangley Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: BNGLY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BNGLY TRBA
broader: MCPDD

Burning Mount Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BNGMT
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BNGMT OLBA
broader: NE

Beeson Grits Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BNGR SDST
has lithology component: BNGR SLTE
broader: MDT

Beinn Gaire Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNGS
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BNGS PEL
has lithology component: BNGS PSAMM
has source info: BNGS_48861
has source info: BNGS_48862
broader: Glenfinnan Group

Brown Howe Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BnH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42463
has lithology component: BNH LPTUF
has lithology component: BNH PYRBRC
has lithology component: BNH TUF
has source info: BNH_50109
has obsolete equivalent: BNH mn 640
broader: MRL
has lower boundary definition: Taken at the abrupt change from masive rhyodacitic tuff and lapilli-tuff of the Whelter Knotts Formtion, to well bedded pyroclastic rocks of intermediate compostion.
has geographical distribution: East of Haweswater Reservoir, northeastern Lake District, Cumbria.
has lithology description: Parallel-bedded, well sorted, acid andesitic or dacitic coarse-grained tuff and fine-grained lapilli-tuff with locally intercalated thin units of pyroclastic breccia containing large ragged bombs of scoriaceous andesite and intruded by many contemporaneous andesite sills.
has thickness description: To 135m, but greatly inflated by sills
has upper boundary definition: Everywhere overlain by contemporaneous andesite intrusions.

Bonnyhill Craw Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNHC
has current status: CURRENT
has theme: BEDRCK
notation: BNHC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNHC COAL
broader: LCMS

Burnhousemoor Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Duneaton Volcanic Formation

Burnwood Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BNI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: NE

Balnakiel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42464
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42465
has lithology component: BNK BREC
has lithology component: BNK CHRT
has lithology component: BNK DOLMST
has lithology component: BNK DOLO
has lithology component: BNK LMST
has lithology component: BNK MDST
has source info: BNK_48901
has source info: BNK_49592
has source info: BNK_49989
has source info: BNK_50473
has source info: BNK_50712
has source info: BNK_51667
has source info: BNK_52035
has obsolete equivalent: BNK mn 232
broader: Durness Group
has lower boundary definition: Conformably overlies the Sangomore Formation.
has geographical distribution: The Durness Group forms a narrow, discontinuous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye. The Balnakiel Formation does not occur in Assynt or Skye and appears to be limited to the more northern parts of the outcrop of the Durness Group.
has lithology description: Alternations of dark grey dolostones and dolomitic limestones and lighter grey bioclastic limestones.
has thickness description: About 140 m thick, although estimated at over 300 m thick by some authors.
has upper boundary definition: Conformably overlain by the Croisaphuill Formation.

Bankhouses Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BNKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BNKL CAMDST
has lithology component: BNKL LMST
has source info: BNKL_51867
has lateral equivalent: BNKL SML
broader: Alston Formation
has geographical distribution: Bankhouses area, Westmorland.
has lithology description: Limestone, with local "reefs" of crinoid debris forming banks and mounds at the top of the "Lower Bankhouses".
has supplementary information: Formerly considered to lie towards the base of the (English) Middle Limestone Formation. Comonly developed as a multiple group of limestones with intervening shale and sandstone beds, with the more prominent "members" being called Lower, Middle and Upper Bankhouses limestones.
has thickness description: From c.6m to c.27m where developed as a multiple unit.

Buckbanks Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BkS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42466
has lithology component: BNKS MDST
has lithology component: BNKS SDST
has lithology component: BNKS SLST
has source info: BNKS_49284
has source info: BNKS_49848
broader: HOM
has lower boundary definition: The base taken at the base of the first sandstone bed above laminated calcisiltites and mudstones of the Hodder Mudstone Formation (undifferentiated).
has geographical distribution: The member is present in the western part of the Craven Basin, in the western closure of the Whitewell Anticline (SD 64 47) and the northern limb of the Clitheroe (SD 75 45), Thornley (SD 62 40) and Throstle Nest (SD 63 44) anticlines.
has lithology description: A dark grey, brown weathered, massive, thick-to thin-bedded, fine-to medium-grained, calcareous, quartzitic, bioclastic (crinoid and brachiopod debris), finely micaceous sandstone, interbeddedwith thin, dark grey, calcareous, laminated mudstones and siltstones.
has thickness description: Maximum thickness of 11.5 m in the Thornley Anticline.
has upper boundary definition: Taken at the passage of sandstone into the overlying laminated mudstones and thin-bedded calcisiltites of the Hodder Mudstone Formation (undifferentiated).

Bennane Lea Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bnl
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42467
has lithology component: BNL BREC
has lithology component: BNL SDST
has source info: BNL_50743
has source info: BNL_52331
broader: Corseclays Sandstone Formation
has lower boundary definition: Highest exposed part of the Corseclays Sandstone Formation.
has geographical distribution: Known only at Bennane Lea, Ayrshire, southwest Scotland.
has lithology description: Lithology. Pebbly sandstone of the Bennane Lea Member is present at the northern limit of the outcrop of the parent Corseclays Formation. At Bennane Lea the sandstone contains matrix-supported sub-angular clasts predominantly of altered basalt. The member is a lateral facies variant developed at the base of the formation where it unconformably overlies Lower Ordovician igneous rocks (Stone, 1988). It was previously informally referred to as the 'Bennane Lea Member' by Peach and Horne as part of the 1894 resurvey and it is noted by Stone (1988) that the Bennane Lea Member has erroneously been referred to an 'upper breccia division' (Jackson et al., 1995).
has thickness description: c.20m
has upper boundary definition: Highest exposed part of the Corseclays Sandstone Formation.

Bannockburn Lower Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNLMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNLMA COAL
broader: LSC

Beacon Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BnL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42468
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42469
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42470
has lithology component: BNLS CONG
has lithology component: BNLS FLMST
has lithology component: BNLS LMOOL
has lithology component: BNLS LMST
has source info: BNLS_49471
has source info: BNLS_49475
has source info: BNLS_50046
has source info: BNLS_51615
has source info: BNLS_51874
has obsolete equivalent: BNLS mn 2137
has obsolete equivalent: BNLS mn 2136
has obsolete equivalent: BNLS mn 4545
broader: LI
narrower: Eype Mouth Limestone Member
narrower: MRWB
narrower: Barrington Member
has lower boundary definition: Non-sequential; downward change from ferruginous, conglomeratic limestone to argillaceous, silty or sandy beds of the Dyrham Formation.
has geographical distribution: Wessex Basin (including Central Somerset Basin) and Mendips-Radstock Shelf area, ie. Dorset coast to approximately Chipping Sodbury.
has lithology description: Limestone, ferruginous-ooidal in lower part, nodular in upper part; conglomeratic in parts; variably grey, pink, reddish-brown and brown in colour. Includes Eype Mouth Limestone Member (above) and Marlstone Member (below).
has thickness description: Up to 5m; typically less than 1.5m
has upper boundary definition: Base of sands of the Bridport Sand Formation.

Brown Metal Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNM COAL
broader: PLCM

First Brown Metal Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNM1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNM1 COAL
broader: PLCM
has lithology description: The Brown Metal Coals are seams of variable quality and thickness and are not widely worked. They are commonly split and washed out by the Birstall Rock. The First and Second Brown Metals coalesce in the west.

Second Brown Metal Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNM2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNM2 COAL
broader: PLCM
has lithology description: The Second Brown Metal Coal (or Old Hards) is a seam of variable quality and thickness. The lower part is a high quality bituminous coal while the upper part is poor quality. The First and Second Brown Metals coalesce in the west.

Third Brown Metal Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNM3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNM3 COAL
broader: PLCM
has lithology description: The Third Brown Metal Coal is thin, of inferior quality and not extensively worked.

Bannockburn Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNMA COAL
broader: LSC

Bottom Brown Metal Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNMB COAL
broader: PLCM

Bin Mountain Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNMS
has current status: CURRENT
has theme: BEDRCK
notation: BNMS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42472
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42471
has lithology component: BNMS CALSST
has lithology component: BNMS LMST
has source info: BNMS_49803
has source info: BNMS_51623
has obsolete equivalent: BNMS mn 1616
broader: TYRO
narrower: TUY
has lower boundary definition: Abrupt change from peritidal micrites and shales of Termon River Limestone Formation to thick beds of crinoidal calcareous sandstone/sandy packstone of Bin Mountain Sandstone Formation. Conformable.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, pale to mid grey, very calcareous, fine- to medium-grained, small bioclast fragments, bioturbated, and limestones, blue-grey, oolitic, crinoidal, very sandy, scattered quartz pebbles.
has thickness description: 80 - 100m.
has upper boundary definition: Conformable, apparently gradual change from calcareous sandstones and sandy grainstones of Bin Mountain Sandstone Formation to dark blue-grey fossiliferous sandy packstones and packstones of Ballyshannon Limestone Formation.

Top Brown Metal Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNMT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNMT COAL
broader: NE

Brecknockshire Glacigenic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNOCK
has current status: CURRENT
has theme: SPRFCL
has revision number: 4
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42473
broader: WALES
narrower: LDTI
narrower: Hereford Till Member

Beinn Nan Ord Gabbro Ring-Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: BNOGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: RG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BNOGB GBBY
broader: Ardnamurchan Centre 3

Bannock Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: BNOK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BNOK COAL
broader: PMCM

Bryn Nicol Formation, Pen Derlwyn Facies
type: Concept
in scheme: NamedRockUnit
alternative label: BNPDF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: Bryn Nicol Formation

Basin Peat
type: Concept
in scheme: NamedRockUnit
alternative label: BNPT
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BNPT PEAT
broader: PEAT

Barnsley Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BNR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BNR SDST
broader: PMCM
has geographical distribution: West and south Yorkshire, especially the area around Rawmarsh and Wentworth and near Barnsley. Becomes thicker southwards from the Calder valley.
has lithology description: Flaggy sandstone of variable thickness and composition.
has thickness description: 0 to c.36m

Black Nore Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BNRB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
broader: POSA

Banton Rider Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BNRC
has current status: CURRENT
has theme: BEDRCK
notation: BNRC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BNRC COAL
broader: LSC

Black Nore Sandstone (Jurassic)
type: Concept
in scheme: NamedRockUnit
alternative label: BNRS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
broader: POSA

Bunter Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: Bacton Group

Burns Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KZ
broader: KC

Broxburn Shale
type: Concept
in scheme: NamedRockUnit
alternative label: BNSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BNSH SAPEL
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Barnstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bst
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42475
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42476
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42477
has lithology component: BNT LMST
has lithology component: BNT MDST
has source info: BNT_49323
has obsolete equivalent: BNT mn 2066
has obsolete equivalent: BNT mn 2067
has obsolete equivalent: BNT mn 4040
has obsolete equivalent: BNT mn 2381
broader: SMD
has lower boundary definition: Base of Lias Group: basal mudstone with sharp contact on Cotham Member of Penarth Group.
has geographical distribution: East Midlands Shelf area: between Market Weighton area to north, and north flank of London Platform to south.
has lithology description: Alternating grey mudstones and limestones; limestones generally 0.1 metres to 0.3 metres thick, argillaceous calcilutites forming c.30% of sequence; shell debris in limestones in basal 2 - 3 metres.
has thickness description: 8.1m to 8.7m in stratotypes, 9.6m at Barnstone; ranging from c.5m - 10m over area of occurence.
has upper boundary definition: At top of highest limestone bed in Member.

Bench Thin Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BNTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BNTC COAL
broader: PLCM

Baillieston Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNTI
has current status: CURRENT
has theme: SPRFCL
notation: BNTI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42478
has lithology component: BNTI C
has lithology component: BNTI DMTN
has lithology component: BNTI S
has lithology component: BNTI V
has lithology component: BNTI Z
has source info: BNTI_49147
has source info: BNTI_49148
has source info: BNTI_49149
has source info: BNTI_50918
has source info: BNTI_51103
has source info: BNTI_51617
has source info: BNTI_52969
has obsolete equivalent: BNTI mn 206
broader: MVG
has additional age information: Pre MIS 2.
has lower boundary definition: Unconformity or glacial deformation boundary on bedrock or on assumed older (usually unclassified) Quaternary strata.
has geographical distribution: Central Scotland, related to ice streams sourced in the Highlands (in contrast to the Southern Uplands) during the Devensian some time prior to the Dimlington Stadial; Glasgow area including the Kelvin and Carron-Bonny Water valley system, north and south Lanarkshire, possibly Ayrshire.
has lithology description: The typical lithology is a glacially organized diamicton (till), composed of isolated boulders, gravel and pebbles in a matrix of sandy silty clay. The more elongated clasts are preferentially oriented and the deposit commonly has systematic sets of joints. The deposit is of a stiff to hard consistency and low plasticity. In general the colour of till reflects that of the local bedrock so may be totally different from one area to the next and can be reddish brown (Devonian and Upper Coal Measures) or brownish grey or black (Carboniferous).
has thickness description: Veneer to more than 20m.
has upper boundary definition: Unconformity or glacial deformation boundary below younger Quaternary strata. Where data are available the Baillieston Till Formation is overlain by the Broomhill Clay Member and/or the Cadder Sand Member of the Wilderness Till Formation or this till itself.

Ben Nevis Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BNVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BNVO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42479
has lithology component: BNVO AGG
has lithology component: BNVO ANDLVH
has lithology component: BNVO VCBR
has source info: BNVO_51463
has source info: BNVO_51673
has source info: BNVO_52128
has obsolete equivalent: BNVO mn 395
broader: NE
has lower boundary definition: The base of the predominantly volcanic rocks above the Allt a' Mhuilinn Mudstone Formation.
has geographical distribution: The Ben Nevis area of Scotland.
has lithology description: Massive unsorted volcanic breccias and agglomerates, some andesitic, with hornblende-bearing andesitic lavas and sheets.
has thickness description: About 630 m presently exposed.
has upper boundary definition: The top of the volcanic succession on Ben Nevis, partly removed by erosion.

Bottom Nether Witton Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BNWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BNWC COAL
broader: SMGP

Bonaly Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: BNY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BNY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42480
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42481
has lithology component: BNY AND
has lithology component: BNY BA
has lithology component: BNY OLBA
has lithology component: BNY RY
has lithology component: BNY TRBA
has lithology component: BNY TRR
has source info: BNY_49223
has source info: BNY_49240
has source info: BNY_49427
has source info: BNY_50454
has source info: BNY_51146
has source info: BNY_51173
has source info: BNY_51673
has source info: BNY_52828
has source info: BNY_52986
has obsolete equivalent: BNY mn 524
has obsolete equivalent: BNY mn 358
has obsolete equivalent: BNY mn 525
broader: PDH
has lower boundary definition: Not exposed. Faulted against Ballagan Formation to the north and overlain by Kinnesswood Formation to west.
has geographical distribution: Pentland Hills.
has lithology description: Lowest flows are feldspar phyric andesites and upper flows are fine-grained andesites. Feldspar phyric olivine basalts and pyroxene-andesites, trachybasalts, rhyolites and trachytes are also present.
has thickness description: 350m maximum
has upper boundary definition: Unconformable: upper flows of andesites and basalts overlain by conglomerates and grits of Greywacke Conglomerate Formation and rhyolite of Bell's Hill Volcanic Member.

Burrington Oolite Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: UG
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41930
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41931
has lithology component: BO CLMST
has lithology component: BO DOLO
has lithology component: BO LMOOL
has lithology component: BO LMST
has source info: BO_49355
has source info: BO_51762
has source info: BO_52591
has obsolete equivalent: BO mn 698
broader: PEMB
narrower: QTWL
narrower: HMM
narrower: Aveline's Hole Limestone
narrower: RBM
narrower: Goblin Combe Oolite Formation
has lower boundary definition: Taken at gradational junction of sparsely crinoidal dolomite of underlying Black Rock Limestone Subgroup and the ooidal limestone [locally dolomitised] of the Burrington Oolite Subgroup. In the eastern Mendip Hills, taken at the incoming of the ooidal limestones above the coarse crinoidal limestones of the Vallis Limestone Formation. Both contacts need further investigation.
has geographical distribution: Mendip Hills [ST 50 55] and Western-super-Mare [ST 30 60] area. Passes north into the Gully Oolite, Clifton Down Mudstone and Goblin Combe Oolite formations. Passes west into Gully Oolite, Caswell Bay Mudstone, High Tor Limestone and Goblin Combe Oolite formations. Passes east into Vallis Limestone Formation and supposedly the Black Rock Limestone Subgroup, but this needs further investigation.
has lithology description: Massive pale grey ooidal limestones and ooidal/crinoidal limestones. Beds of coarse crinoidal limestone in lower part and calcite mudstones in uppermost part. Locally dolomitised in lowermost part.
has thickness description: 210m at Burrington Combe to 230m at Wells, thinning to a feather edge in the eastern Mendip Hills.
has upper boundary definition: Taken at the incoming of calcite mudstones and dark splintery limestones of the Clifton Down Limestone Formation above the ooidal and ooidal/crinoidal limestones of the Subgroup.

Bow Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BwBr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41933
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41932
has lithology component: BOB BREC
has source info: BOB_49280
has source info: BOB_49846
has source info: BOB_52249
has obsolete equivalent: BOB mn 545
has obsolete equivalent: BOB mn 546
broader: Exeter Group
has lower boundary definition: Rests directly on Upper Carboniferous Bude Formation, from Lower Creedy (SS 843 027) westwards to western edge of Exeter district, although thin Cadbury Breccia may locally intervene. East of Bradley Farm (SS 855 023) apparently overlies Cadbury Breccia.
has geographical distribution: Occupy the whole width of the Crediton Trough to the west of Bow (in the Okehampton district). In the Exeter district, present along the northern side of the trough from near Elston (SS 785 026) in the west, through Sandford to Bradley Farm (SS 855 023).
has lithology description: Breccia, reddish-brown, silty and sandy, with pebbles of sandstone, slate, shale, hornfels, acid lava, vein-quartz and quartz porphyry. Middle Devonian limestone clasts present at Solland (SS 615 021) and Westacott (SS 685 022). (Hutchins, 1958). Lamprophyres and basalts present near north Tawton, on southern side of trough.
has thickness description: Up to 140 (Crediton area). 430m (Bow). 380m (north Tawton). 180m+ (Sampford Chapple). 150m+ (Hatherleigh-Exbourne).
has upper boundary definition: Passes gradationally up into the Knowle Sandstone Formation by gradual increase in the proportion of breccia.

Bosies Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: ZG

Brig O' Balgownie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOBC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BOBC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41934
has lithology component: BOBC CONG
has lithology component: BOBC MDST
has lithology component: BOBC SDST
has source info: BOBC_51673
has source info: BOBC_52069
has obsolete equivalent: BOBC mn 607
has obsolete equivalent: BOBC mn 3132
broader: NE
has lower boundary definition: Unconformity with the Dalradian Supergroup below.
has geographical distribution: Aberdeen area of Scotland.
has lithology description: Mainly a well-rounded conglomerate with clasts of granite and psammite of local provenance, and some sandstone and mudstone interbeds.
has thickness description: Variable, up to 160 m proved.
has upper boundary definition: Not seen, as the top is cut out by faulting.

Bone Bed Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BOBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BOBL LMST
broader: HON

Boulder Clay
type: Concept
in scheme: NamedRockUnit
alternative label: BOC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BOC DIAMIT
is obsolete equivalent of: BOC THT
is obsolete equivalent of: BOC LHTI
is obsolete equivalent of: BOC FINT
is obsolete equivalent of: BOC SHREW
is obsolete equivalent of: BOC GRET
is obsolete equivalent of: BOC NPEG
broader: NE
has lithology description: Clay and silty clay, commonly pebbly and sandy, reddish brown, stiff, possibly interbedded with sand and gravel-rich lenses and rare peat. [Generic description].

Balloch Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOCH
has current status: CURRENT
has theme: SPRFCL
notation: BOCH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41935
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41936
has lithology component: BOCH C
has lithology component: BOCH S
has lithology component: BOCH V
has lithology component: BOCH Z
has lithology component: BOCH ZC
has source info: BOCH_49147
has source info: BOCH_49148
has source info: BOCH_50918
has source info: BOCH_51103
has source info: BOCH_51401
has source info: BOCH_51617
has obsolete equivalent: BOCH mn 225
has obsolete equivalent: BOCH mn 226
has obsolete equivalent: BOCH mn 972
broader: Clyde Clay Formation
has additional age information: Loch Lomond Stadial.
has lower boundary definition: The Ballock Clay Member of the Clyde Clay Formation rests with angular unconformity on older Quaternary sediments or bedrock. It normally rests on the Inverleven Gravel Member of the Clyde Clay Formation or possibly on the Wilderness Till Formation (WITI) of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup).
has geographical distribution: The Balloch Clay Member of the Clyde Clay Formation is recognized in the Leven valley south of Loch Lomond.
has lithology description: Clayey silt, clay and sand, mid to dark grey, bedded and thinly laminated in places, with dark sulphide patches and fine mica; very soft to soft consistency and medium to low plasticity, isolated clasts up to 3cm (presumed dropstones), some graded units, sulphide patches, rare marine shells and plant remains.
has thickness description: Veneer to more than 40m.
has upper boundary definition: The Balloch Clay Member of the Clyde Clay Formation is overlain unconformably by younger Quaternary sediments, normally the Clydebank Clay Formation of the British Coastal Deposits Group but will include buried deposits belonging to the deglacial phase at the end of the Loch Lomond Stadial.

Bochruben Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOCHR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: BOCHR BREC
has lithology component: BOCHR CONG
broader: INS

Boyne Castle Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BoCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41937
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41938
has lithology component: BOCL CALSIR
has lithology component: BOCL MLMST
has lithology component: BOCL SEMPEL
has source info: BOCL_48670
has source info: BOCL_49235
has source info: BOCL_50001
has source info: BOCL_51142
has obsolete equivalent: BOCL mn 4434
broader: Boyne Limestone Formation
has lower boundary definition: Base of massive metalimestone bed above the semipelites of the Old Hythe Limestone Member.
has geographical distribution: From Moray Firth coast (Old Hythe to Boyne Bay) [NJ 6155 6625 - NJ 6165 6608] to 300m northwest of Hill of Chattie [587 630].
has lithology description: Thin-bedded metalimestone, 200m thick, with minor calc-silicate rock; shows abundant minor tight folding.
has thickness description: c.200m on coastal section; progressivley overstepped southwards by Whitehills Grit Formation.
has upper boundary definition: Transition to laminated and striped calc-silicate rock at the base of the Whyntie Brae Limestone Member.

Brora Coal Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
broader: Fladen Group

Botney Cut Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOCT
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
broader: NE

Bodgadle Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bdl
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41939
has lithology component: BOD RYTUF
has source info: BOD_50909
broader: Carneddol Rhyolitic Tuff Formation
has lower boundary definition: Sudden influx of coarse crystal-lithic tuffs, above strongly welded Nant-y-Gledryd Member, or volcaniclastic sediments of the Yoke House Formation.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: Rhyolitic crystal-lithic tuffs, rather variable characteristics, strongly welded locally.
has thickness description: 200-250m
has upper boundary definition: Overlain by volcaniclastic sandstones, breccias of the Yoke House Formation, and locally by Nod Glas Formation.

Bodafon Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BODA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has source info: BODA_52293
broader: NE
has additional age information: ?Pridoli to Lochkovian (based on Figure 7, p.43 in House et al., 1977).
has geographical distribution: Anglesey.
has thickness description: 3 to 45m

Bovey Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41940
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41941
has lithology component: BOF AROC
has lithology component: BOF CLAY
has lithology component: BOF LIGN
has lithology component: BOF SANDU
has lithology component: BOF SDST
has lithology component: BOF SILT
has source info: BOF_49855
has source info: BOF_51105
has source info: BOF_52415
broader: NA
narrower: Abbrook Clay And Sand Member
narrower: SO
narrower: WOG
has additional age information: Late Eocene to Mid Oligocene (Curry et al., 1978).
has lower boundary definition: Underlain along its eastern outcrop and south of Newton Abbot by the Aller Gravel and the Upper Greensand. Elsewhere unconformable upon, or faulted against, Devonian, Carboniferous or Permian Rocks.
has geographical distribution: Restricted to the Bovey Basin in Devon.
has thickness description: To 1200m (Curry et al., 1978).
has upper boundary definition: the original top of the Formation is not preserved, and its eroded top now forms the land surface, underlying the modern soil.

Bopeep Flints
type: Concept
in scheme: NamedRockUnit
alternative label: BOFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Boggierow Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BOGGI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BOGGI MGNFO
has lithology component: BOGGI MSDR
broader: KEPO

Insch Pluton (Boganclogh Sector)
type: Concept
in scheme: NamedRockUnit
alternative label: BOGH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: INSCH
narrower: Insch Pluton (Boganclogh Sector Lower Zone)
narrower: Insch Pluton (Boganclogh Sector Middle Zone)
narrower: Insch Pluton (Boganclogh Sector Upper Zone)

Boglochty Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BOGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
broader: NE

Bothyhill Gravels Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOGR
has current status: CURRENT
has theme: SPRFCL
notation: BG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41943
has lithology component: BOGR GRAV
has lithology component: BOGR SANDU
has source info: BOGR_48667
has source info: BOGR_48668
has source info: BOGR_49369
has obsolete equivalent: BOGR GSG
broader: Alturlie Gravels Formation
has lower boundary definition: Unseen, probably gradational with Ardersier Silts Formation below.
has geographical distribution: Alturlie Peninsula, 6km eastnortheast of Inverness.
has lithology description: Sand and gravel, coarsening-upwards deltaic sequence, containing sparse cobbles of Inchbae granite-gneiss.
has thickness description: 20m (+)
has upper boundary definition: Unconformable, with (Late Devensian) raised beach gravels above.

Hodderense Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BOH
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41945
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41946
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41944
has lithology component: BOH CHRT
has lithology component: BOH LMST
has lithology component: BOH MDST
has lithology component: BOH SDST
has source info: BOH_49284
has source info: BOH_50228
has source info: BOH_51128
has source info: BOH_51507
has source info: BOH_52900
has obsolete equivalent: BOH mn 418
has obsolete equivalent: BOH mn 521
broader: Craven Group
has lower boundary definition: In the Craven Basin the lower boundary is drawn at the base of the first cream-coloured wackestone with dark blue micritic nodules of the Hodderense Limestone Formation, where it rests conformably on grey or dark grey mudstone and calcisiltite of the Hodder Mudstone Formation. In the south Isle of Man, the base of the formation is poorly defined. Where it occurs in the field close [SC 2580 6620] to the Visitor Centre at Scarlett, south of the old lime kilns, the wackestones and packstones of the underlying Knockrushen Formation are overlain by the massive lime mudstones of the Hodderense Limestone Formation. The base of the latter "is taken at the lowest mottled horizon" (Dickson et al., 1987), and this mottling is a result of the presence of blue or grey micrite nodules up to 3cm in size.
has geographical distribution: Craven Basin, northwest England, although removed beneath the unconformity in the Skipton area; also present in the south of the Isle of Man.
has lithology description: Pale olive and blue-grey, to cream-coloured porcellanous wackestones with characteristic dark blue, micritic nodules, sporadic interbedded packstones and common mudstones. Chert is common in the Isle of Man sections and some beds are multi-storey, displaying lag horizons composed of reworked micrite nodules, inadunate crinoids, bellerophontid gastropods, cephalopods, trilobites and sponges. Also present is the trace fossil Helminthoides.
has thickness description: Up to 15m thick in the Craven Basin and 14m in the south of the Isle of Man.
has upper boundary definition: In the Craven Basin the upper boundary is drawn at the conformable upward passage from the highest nodule-bearing cream-coloured wackestone bed of the Hodderense Limestone Formation, to the first grey mudstone of the Pendleside Limestone Formation. In the south of the Isle of Man, at Scarlett Point [SC 2583 6633] the upper boundary of the Hodderense Limestone Formation occurs below the lowest black claystone of the wackestones, lime-mudstones and interbedded claystones of the Scarlett Point Member, Bowland Shale Formation.

Bowland High Group
type: Concept
in scheme: NamedRockUnit
alternative label: BOHI
has current status: CURRENT
has theme: BEDRCK
notation: BOHI
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41947
has lithology component: BOHI CAMDST
has lithology component: BOHI CASLST
has lithology component: BOHI LMMD
has lithology component: BOHI LMST
has source info: BOHI_49279
has source info: BOHI_49284
has source info: BOHI_50767
has source info: BOHI_50903
has source info: BOHI_52686
has source info: BOHI_52825
has source info: BOHI_52858
has obsolete equivalent: BOHI mn 2080
has obsolete equivalent: BOHI mn 2083
broader: Carboniferous Limestone Supergroup
narrower: HBNK
narrower: Chatburn Limestone Formation
narrower: Clitheroe Limestone Formation
has lower boundary definition: Not exposed or proved
has geographical distribution: The Craven Basin between Clitheroe and Skipton.
has lithology description: Pale to dark grey, packstone and wackestone with subordinate grainstones, partings and thin beds of calcareous mudstone and calcareous siltstone. Mudmound reef (Waulsortian) limestones are present in the upper part of the group.
has thickness description: Up to 2340 m thickness known (base not proved).
has upper boundary definition: The uppermost limestone of the Bowland High Group, overlain by mudstones of the Hodder Mudstone Formation, marked by regional unconformity.

Bole Hill Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BOHIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41948
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41949
has lithology component: BOHIL SDST
has lithology component: BOHIL SLST
has source info: BOHIL_49616
has source info: BOHIL_50700
has source info: BOHIL_51069
has obsolete equivalent: BOHIL WGF
has lateral equivalent: BOHIL st 126
broader: PLCM
has lower boundary definition: The base of the Bole Hill Sandstone overlies a regionally widespread mudstone containing the non-marine 'Daubhill fauna'. Locally the base is erosive, cutting through this mudstone into the underlying sandstones of the Wingfield Flags (Chisholm 1990, fig.9).
has geographical distribution: Sandstone is mappable at outcrop from [SK 368 663] to [SK 382 563]. Main part of sandstone is an east-west oriented palaeochannel with outcrop extending from [SK 368 663] at the northern margin of the channel to [SK 379 590] at the southern margin of the channel.
has lithology description: Sandstone, greenish grey, buff-weathered, argillaceous, fine- and very fine-grained; part poorly bedded, part current ripple-laminated and cross-bedded; mean cross-bed palaeocurrent flow direction toward the east (Chisholm 1990, fig.8).
has thickness description: To 40m (Chisholm 1990, fig.9)
has upper boundary definition: The top of the Bole Hill Sandstone is overlain by the Kilburn Coal (Chisholm 1990, fig.9).

Botany Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BOL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BOL LMST
has lithology component: BOL MDST
has lateral equivalent: BOL GRST
broader: MG

Bottom Little Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: BOLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BOLC COAL
has obsolete equivalent: BOLC mn 535
broader: RAD

Bold Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOLD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: BOLD MDST
broader: NE

Bolsa Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BOLS SEMPEL
broader: Bonahaven (Bunnahabhain) Dolomite Formation

Insch Pluton (Boganclogh Sector Lower Zone)
type: Concept
in scheme: NamedRockUnit
alternative label: BOLZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: BOLZ DUN
has lithology component: BOLZ HZBT
has lithology component: BOLZ OLGB
has lithology component: BOLZ OLGBNO
has lithology component: BOLZ PDT
has lithology component: BOLZ SCHT
has lithology component: BOLZ SEPITE
has lithology component: BOLZ TROCT
has lithology component: BOLZ UMR
broader: Insch Pluton (Boganclogh Sector)

Bollin Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BoM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41950
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41951
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41952
has lithology component: BOM MDST
has lithology component: BOM SLST
has source info: BOM_51316
has source info: BOM_51674
has obsolete equivalent: BOM mn 2194
has obsolete equivalent: BOM mn 2818
has obsolete equivalent: BOM mn 522
broader: SIM
has lower boundary definition: Top of Tarporley Siltstone Formation.
has geographical distribution: Cheshire Basin.
has lithology description: The upper part is a dominantly laminated reddish-brown and greenish-grey mudstone with siltstones. The lower part is a structureless and laminated, dominantly reddish-brown mudstone. Within the lower part of the member, a unit termed the 'Lower Keuper Sandstone' has been recognised in the Stockport area. This unit closely resembles the Tarporley Siltstone Formation of adjacent areas.
has thickness description: 1188ft 6ins in the Wilkesley Borehole (British Geological Survey; SJ64SW/7).(362.25m).
has upper boundary definition: Base of Northwich Halite Member.

Bogside Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BOMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: BOMA COAL
broader: NE

Blacko Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BOMB
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BOMB MDST
broader: MG

Boganglogh Margin Type Ultramafic Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BOMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEBAS

Insch Pluton (Boganclogh Sector Middle Zone)
type: Concept
in scheme: NamedRockUnit
alternative label: BOMZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: BOMZ GBNO
has lithology component: BOMZ NO
has lithology component: BOMZ NOQB
broader: Insch Pluton (Boganclogh Sector)

Bonanza Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BON
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BON COAL
broader: NE

Bone Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: BONC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BONC COAL
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Bonchester Hill Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BONH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BONH MCGBPP
broader: KELSO

Bonnington Intrusion (?Sill)
type: Concept
in scheme: NamedRockUnit
alternative label: BONTN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: BONTN BSN
broader: LAFAS

Boon's Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Boo
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41953
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41954
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41955
has lithology component: BOO BREC
has lithology component: BOO SDST
has lithology component: BOO SLST
has source info: BOO_51583
broader: Hartshill Sandstone Formation
has lower boundary definition: Sharp unconformable contact of granulestone on spheroidally-weathered Precambrian tuffs of the Caldecote Volcanic Formation.
has geographical distribution: North and south-east sectors of Boons Quarry south of Grange Farm.
has lithology description: Red massive granulestone and boulder-breccia beds at base, passing up to red lithic sandstone with thin breccia layers and capped by grey massive sandstone with minor siltstone. Sandstone and granulestone are massive, with sporadic parallel stratification and normal or inverse grading. Boulder breccias contain large (to 2m) rounded clasts detached from underlying weathered Precambrian rocks.
has thickness description: Possibly between 20 and 40m in general range. In partial type sections: a)3.0mb) 7.2m minimum c) 6.7m.
has upper boundary definition: Conformable contact with Park Hill Member. The top is taken at the surface of the bed immediately beneath the first sandstone to show significant current bedding.

Bookham Conglomerate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BOOC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41956
has lithology component: BOOC CHLK
has lithology component: BOOC CONG
has source info: BOOC_48760
has source info: BOOC_49332
has source info: BOOC_50906
has source info: BOOC_51274
has source info: BOOC_51547
has source info: BOOC_51584
has obsolete equivalent: BOOC mn 3226
broader: WMCH
has additional age information: Lower and Upper Cenomanian. Up to Acanthoceras rhotomagense Zone,
has lower boundary definition: Unconformable, locally strongly erosive boundary with underlying Shaftesbury Sandstone Member.
has geographical distribution: Known for Dorset and Wiltshire over the Mid Dorset Swell
has lithology description: Clasts of very glauconitic shelly sandstone, up to cobble size, commonly with a phosphatic rind, together with phosphatised shells (bivalves & ammonites) in a matrix of sandy glauconitic chalk. The derived fauna is Latest Albian; the indigenous fauna is Early Cenomanian.
has thickness description: 0-1 m.
has upper boundary definition: At the disconformable contact with phosphatic pebble bed at the base of the Zig Zag Chalk Formation or the West Melbury Marly Chalk Formation (at the base of the Chalk Basement Bed of Kennedy, 1970)

Balladoole Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOOL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BOOL CST
has lithology component: BOOL DOLMST
has lithology component: BOOL LMST
has lithology component: BOOL SLST
broader: Great Scar Limestone Group
has thickness description: c.90m

Bog Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOQ
has current status: CURRENT
has theme: BEDRCK
notation: BoQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41957
has lithology component: BOQ QZITE
has source info: BOQ_48657
has source info: BOQ_49954
has obsolete equivalent: BOQ mn 515
has obsolete equivalent: BOQ mn 516
broader: NE
has lower boundary definition: Unconformably overlies Llanvirn Hyssington Volcanic Formation.
has geographical distribution: Not defined.
has lithology description: Variable arenaceous beds with abundant joints.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Borestone Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BOR
has current status: CURRENT
has theme: BEDRCK
notation: Bor
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BOR COAL
broader: LSC

Boreland Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BORE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BORE COAL
broader: LCMS

Allt A'Mhuilinn Pseudoleucite-Syenite And Associated Rocks
type: Concept
in scheme: NamedRockUnit
alternative label: BORO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Borthwick Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BORT
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: BORT BA
has lithology component: BORT MCOLGB
has lithology component: BORT OLBA
broader: MCPAS

Bognor Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BoS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41959
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41960
has lithology component: BOSA CALSST
has lithology component: BOSA SANDU
has source info: BOSA_49217
has source info: BOSA_50496
has obsolete equivalent: BOSA mn 518
has obsolete equivalent: BOSA mn 519
has obsolete equivalent: BOSA mn 517
broader: LC
has lower boundary definition: Incoming of sand and glauconite at the top of King's (1981) Division A of London Clay, (a coarsening upwards sequence of clays and silts).
has geographical distribution: Easternmost Hampshire Basin. Not mapped on or West of Southampton Sheet by BGS.
has lithology description: Glauconitic bioturbated or cross-bedded fine- and medium-grained sands, partially cemented.
has thickness description: 5-10m
has upper boundary definition: At Whitecliff Bay passes up into sandy clayey silts of Division A (King, 1981) aspect but elsewhere is cut out by erosion surface at the base of the silty clays of Division B1 of London Clay (King, 1981).

Boscastle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOSC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41961
has lithology component: BOSC LAVA
has lithology component: BOSC LMST
has lithology component: BOSC MDST
has lithology component: BOSC SDST
has lithology component: BOSC SLST
has lithology component: BOSC TUF
has source info: BOSC_49497
has source info: BOSC_50057
has source info: BOSC_51557
has source info: BOSC_53044
has obsolete equivalent: BOSC mn 531
has obsolete equivalent: BOSC CKF
broader: TEVY
has lower boundary definition: The lower boundary is not seen as it is tectonic. However, the Formation inter-tongues with the Buckator and Teign Chert formations. Lower boundaries with the Buckator Formation are taken at the gradational appearance of dark grey sandstones and mudstones of the Boscastle Formation above the green grey mudstones with thin calcareous siltstones and limestones of the underlying Buckator Formation. Only an upper boundary is seen with the Teign Chert Formation.
has geographical distribution: Between Boscastle (SX 95 91) and Lewanwick (SX 27 81), north Cornwall.
has lithology description: Dark grey to black pyritous mudstones with thin laminated siltstones. Packets of thin- to thick-bedded grey fine- to coarse-grained quartzose sandstones punctuate the Formation. Adjacent to intertonguing contacts with the Buckator Formation, the sandstones are calcareous, locally shelly and locally accompanied by thick beds of bioclastic limestone and nodules of silicified limestone. The mudstones are locally burrowed. Rare thin beds of tuffaceous mudstone, and tuffs and lavas also occur.
has thickness description: Several hundred metres, but may be more or less due to the faulting, thrusting and folding.
has upper boundary definition: The upper boundary is not seen as it is tectonic. However, the formation intertongues with the Buckator and Teign Chert formations. Upper boundaries with the Buckator Formation are taken at the gradational appearance of green grey mudstones with thin calcareous siltstones and limestones of the underlying Buckator Formation above the dark grey sandstones and mudstones of the Boscastle Formation. Upper boundaries with the Teign Chert Formation are taken at the incoming of silicified siltstones, mudstones and scattered chert beds of the Teign Chert Formation above the interbedded sandstones and mudstones of the Boscastle Formation.

Borrowash Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BOSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has lithogenesis: FLUV
has lithology component: BOSG CLAY
has lithology component: BOSG GRAV
has lithology component: BOSG SANDU
has lithology component: BOSG SILT
has source info: BOSG_50370
has obsolete equivalent: BOSG mn 2591
broader: NE
has lower boundary definition: The bedrock surface - commonly cryogenically involuted; other deposits may intervene.
has geographical distribution: Derwent Valley.
has lithogenesis description: River Terrace Deposits.
has lithology description: Sand and gravel with minor clay and silt lenses.
has thickness description: To 4.5m
has upper boundary definition: Top of sand and gravel, commonly corresponding to terrace surface; commonly overlain by head that is involuted with sand and gravel to varying degrees.

Boscombe Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
broader: Barton Group

Bovisand Formation And Staddon Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BOST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has lithology component: BOST LMST
has lithology component: BOST MDST
has lithology component: BOST SDST
has lithology component: BOST SLST
has lithology component: BOST SLTE
broader: MDT

Bodlondeb Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BOT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Bottom Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BOTC
has current status: CURRENT
has theme: BEDRCK
notation: Bo
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BOTC COAL
broader: PLCM

Bottom Furnace Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BOTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BOTF COAL
has lateral equivalent: BOTF st 129
has obsolete equivalent: BOTF mn 534
broader: PMCM

Bogside Thick Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BOTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: BOTH COAL
broader: PGP

Boueti Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BOU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: BOU LMST
broader: Forest Marble Formation

Bouldnor Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GR
has predominant age: GR
has youngest age: GR
broader: NE

Insch Pluton (Boganclogh Sector Upper Zone)
type: Concept
in scheme: NamedRockUnit
alternative label: BOUZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: BOUZ MZDIO
has lithology component: BOUZ MZOL
has lithology component: BOUZ OLGB
has lithology component: BOUZ OLGBFE
has lithology component: BOUZ SYR
has lithology component: BOUZ TROCT
broader: Insch Pluton (Boganclogh Sector)

Bovisand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bov
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41962
has lithology component: BOV LMST
has lithology component: BOV SDST
has lithology component: BOV SLST
has lithology component: BOV SLTE
has source info: BOV_51461
has source info: BOV_52071
has source info: BOV_52133
has source info: BOV_52416
has source info: BOV_52952
has obsolete equivalent: BOV MDT
has obsolete equivalent: BOV mn 2791
broader: MDT
narrower: LLSA
narrower: ULSA
has lower boundary definition: Faulted out; overthrust by the Whitsand Bay Formation. Transitional boundary with Whitsand Bay Formation in the Rame Peninsula; grey slaty mudstone passing down into purple slaty mudstone.
has geographical distribution: Geological sheets 348 and 349 (not mapped elsewhere).
has lithology description: Slaty mudstone, medium to dark grey, with thin sandstone beds and sporadic thin limestone beds. Packets of quartzitic sandstone beds are present in the form of the Upper and Lower Longsands Sandstone members.
has thickness description: At least 1300m.
has upper boundary definition: Faulted out; Bovisand Formation thrust over the Staddon Formation for much of the area.

Bowhouse Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BOW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BOW COAL
broader: LCMS

Bowhousebog Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BOWI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BOWI FEST
broader: PLCM

Bowmore Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: BOWM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BOWM PSAMM
has lithology component: BOWM SEMPEL
has obsolete equivalent: BOWM mn 554
has obsolete equivalent: BOWM mn 553
broader: NE
narrower: LASA
narrower: Blackrock Grit Formation

Bowsey Wood Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOWO
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41963
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41964
has lithology component: BOWO LMST
has lithology component: BOWO MDST
has source info: BOWO_49279
has source info: BOWO_50820
has source info: BOWO_51259
has source info: BOWO_52516
has obsolete equivalent: BOWO mn 159
broader: PKLM
has lower boundary definition: The base of the formation is not proved and the underlying succession is unknown
has geographical distribution: The formation occurs in the northern part of the Market Drayton Horst. The formation is limited in outcrop to a small inlier [about 1km long and 300m wide] at Limekiln Farm, Astbury [SJ 86 59]. The formation is also present in the subsurface within the Stoke-on-Trent, District, proved in the Bowsey Wood and Bittern's Wood boreholes.
has lithology description: Pale grey, massive and thickly bedded limestone. At the type locality the formation comprises very fine-to-very coarse-grained, slightly dolomitised packstones containing shell fragments with micritic [cyanobacterial] coatings, and calcareous mudstones
has thickness description: Minimum thickness of 13.5m measured at the type locality.
has upper boundary definition: At Astbury [SJ 86 59], the top of the formation is taken at the conformable base of the mudstone-rich succession, with surbordinate limestone, of the Astbury Formation above the limestone- dominated succession of the Bowsey Wood Formation. In the Bowsey Wood and Bittern's Wood boreholes the top of the formation is an unconformity, overlain by mudstone of the Bowland Shale Formation.

Bottom Yard Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BOYD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BOYD COAL
broader: PMCM

Botany Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BOYGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BOYGR SDST
broader: MG

Boyne Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BOYL
has current status: CURRENT
has theme: BEDRCK
notation: BoyL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41965
has lithology component: BOYL CALSIR
has lithology component: BOYL MLMST
has lithology component: BOYL PEL
has lithology component: BOYL PSAMM
has lithology component: BOYL QZITE
has lithology component: BOYL SEMPEL
has source info: BOYL_48670
has source info: BOYL_50001
has source info: BOYL_51142
has obsolete equivalent: BOYL mn 4623
has obsolete equivalent: BOYL mn 558
broader: Tayvallich Subgroup
narrower: OLHL
narrower: WHYL
narrower: Boyne Castle Limestone Member
has lower boundary definition: First white limestone at the west side of Old Hythe Bay.
has geographical distribution: From Moray Firth coast (Old Hythe to Whyntie Head) [NJ 609 664 to NJ 630 658] to Hill of Chattie [NJ590 625].
has lithology description: Thin-bedded metalimestone, semipelite calc-silicate rock. Old Hythe Limestone Member: finely interbedded semipelite and psammite with lenses of quartzite and white cream metalimestone. Boyne Castle Limestone Member: thin-bedded metalimestone, 200m thick, with minor calc-silicate rock; shows abundant minor folding. Whyntie Brae Limestone Member: calc-silicate rock, laminated and striped, passing upward into semipelite with minor thin metalimestone and lenses of reworked carbonate material.
has thickness description: c.900m on coastal sections; progressively overstepped southwards by Whitehills Grit Formation.
has upper boundary definition: Local unconformity at incoming of first major psammite bed (locally gritty) at base of Whitehills Grit Formation.

Bozeat Till
type: Concept
in scheme: NamedRockUnit
alternative label: BOZE
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/!
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BOZE DMTN
broader: NA

Basal Permian Breccia (South West)
type: Concept
in scheme: NamedRockUnit
alternative label: BPBR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Blae Pot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BPCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BPCO COAL
broader: MG

Brasspoint Flint
type: Concept
in scheme: NamedRockUnit
alternative label: BPFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: SECK

Belper Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BPG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BPG SDST
broader: MARSD

Black Park Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BPGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41967
has lithogenesis: FLUV
has lithology component: BPGR C
has lithology component: BPGR P
has lithology component: BPGR S
has lithology component: BPGR V
has lithology component: BPGR Z
has source info: BPGR_49367
has source info: BPGR_49737
has source info: BPGR_51212
has source info: BPGR_51353
has source info: BPGR_52654
broader: TV
has additional age information: Late-Anglian.
has lower boundary definition: Rests unconformably on bedrock geology (London Clay on Sheet 256).
has geographical distribution: Thames Valley and associated tributaries.
has lithology description: Sand and gravel, with possible lenses of silt, clay or peat. [Generic description]. Horizontally stratified, matrix-supported gravel with thin tabular cross-bedded sand channels. Gravel assemblage is characterised by abundant angular flint (75-89%), sparse rounded flint (3-9%), sparse vein quartz (4-10%) and sparse quartzite (1-6%).
has thickness description: 1-6m, average 3m
has upper boundary definition: At surface.

Bottom Pigeon House Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BPHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BPHC COAL
broader: PLCM

Bampton Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BPLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41969
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41970
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41968
has lithology component: BPLM CHRT
has lithology component: BPLM LMST
has lithology component: BPLM MDST
has source info: BPLM_48786
has source info: BPLM_49094
has source info: BPLM_50469
has source info: BPLM_50519
has source info: BPLM_51680
has obsolete equivalent: BPLM mn 234
has obsolete equivalent: BPLM mn 235
has obsolete equivalent: BPLM CTF
has obsolete equivalent: BPLM mn 2511
has obsolete equivalent: BPLM mn 2558
has obsolete equivalent: BPLM mn 4332
has obsolete equivalent: BPLM mn 236
has obsolete equivalent: BPLM mn 307
has obsolete equivalent: BPLM mn 2831
broader: TEVY
narrower: HYBC
narrower: KSDC
narrower: Bailey's Beds
has lower boundary definition: Between Brushford and Ashbrittle the lower boundary is taken at the incoming of thin- to medium-bedded soft siliceous mudstones with impure limestones and cherts of the Bampton Limestone Formation above the hard black finely laminated unfossiliferous cherty mudstones of the underlying Doddiscombe Formation.
has geographical distribution: Between Brushford (SS 92 26) and Ashbrittle (ST 04 21), Somerset.
has lithology description: Thin- to medium-bedded limestones, cherts, siliceous radiolarian mudstones (termed cherts in some literature) and mudstones. The limestones are locally partly silicified. The proportion of limestone, chert and mudstone varies vertically allowing a threefold division in the Bampton area; elsewhere these divisions have not been proved and there is evidence that north of Bampton the Formation is dominated by mudstones and cherts. At the base, the informal Hayne Beech Beds comprise soft, pale-weathering, siliceous radiolarian laminated shaly mudstones (cherts of literature) with some impure argillaceous limestones. Above, the Kersdown Chert Member comprises laminated cherts with interbedded shaly mudstones and a few limestones. The upper unit, the informal Bailey's Beds, consists of black shaly mudstones with limestones and minor cherts, the top 4m yields abundant spirally striated goniatites and pectinoid bivalves (Posidonia Beds).
has thickness description: c.80m
has upper boundary definition: Between Brushford and Ashbrittle the upper boundary is taken at the incoming of dark grey predominantly unfossiliferous finely laminated silty mudstones with scattered siltstones of the overlying Dowhills Mudstone Formation above the highest limestone bed of the Bampton Limestone Formation.

Blae Pot Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BPLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BPLS LMST
broader: SMGP

Bottom Plessey Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BPLY
has current status: CURRENT
has theme: BEDRCK
notation: BPly
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BPLY COAL
has lateral equivalent: BPLY st 545
has lateral equivalent: BPLY st 181
broader: PMCM

Bampton Limestone Formation [Obsolete Code: Use Bplm]
type: Concept
in scheme: NamedRockUnit
alternative label: BPM
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41971
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41972
has lithology component: BPM CHRT
has lithology component: BPM LMST
has lithology component: BPM MDST
has source info: BPM_48786
has source info: BPM_49094
has source info: BPM_50469
has source info: BPM_50519
has obsolete equivalent: BPM mn 234
has obsolete equivalent: BPM mn 236
has obsolete equivalent: BPM mn 307
has obsolete equivalent: BPM CTF
has obsolete equivalent: BPM mn 2558
broader: TEVY
has lower boundary definition: Between Brushford and Ashbrittle the lower boundary is taken at the incoming of thin- to medium-bedded soft siliceous mudstones with impure limestones and cherts of the Bampton Limestone Formation above the hard black finely laminated unfossiliferous cherty mudstones of the underlying Doddiscombe Formation.
has geographical distribution: Between Brushford (SS 92 26) and Ashbrittle (ST 04 21), Somerset.
has lithology description: Thin- to medium-bedded limestones, cherts, siliceous radiolarian mudstones (termed cherts in some literature) and mudstones. The limestones are locally partly silicified. The proportion of limestone, chert and mudstone varies vertically allowing a threefold division in the Bampton area; elsewhere these divisions have not been proved and there is evidence that north of Bampton the Formation is dominated by mudstones and cherts. At the base, the informal Hayne Beech Beds comprise soft, pale-weathering, siliceous radiolarian laminated shaly mudstones (cherts of literature) with some impure argillaceous limestones. Above, the Kersdown Chert Member comprises laminated cherts with interbedded shaly mudstones and a few limestones. The upper unit, the informal Bailey's Beds, consists of black shaly mudstones with limestones and minor cherts, the top 4m yields abundant spirally striated goniatites and pectinoid bivalves (Posidonia Beds).
has thickness description: c.80m
has upper boundary definition: Between Brushford and Ashbrittle the upper boundary is taken at the incoming of dark grey predominantly unfossiliferous finely laminated silty mudstones with scattered siltstones of the overlying Dowhills Mudstone Formation above the highest limestone bed of the Bampton Limestone Formation.

Belper Lawn Coal (Leicester, Nottingham, Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BPN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BPN COAL
broader: PLCM

Basal Permian Sands Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BPS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has lithology component: BPS SDST
broader: RLG

Basal Permian Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BPST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: BPST SDST
is obsolete equivalent of: BPST YWS
broader: RLG

Pleinmont Metasediments
type: Concept
in scheme: NamedRockUnit
alternative label: BPT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Bedded Pyroclastic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BPY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41973
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41974
has lithology component: BPY BA
has lithology component: BPY LAVA
has lithology component: BPY TUF
has lithology component: BPY TUFT
has lithology component: BPY VCBR
has source info: BPY_49435
has source info: BPY_49974
has source info: BPY_50521
broader: SV
has lower boundary definition: Overlies the Lower Rhyolitic Tuff Formation.
has geographical distribution: Central Snowdonia.
has lithology description: Bedded basaltic tuff, tuffite, breccia deposits, intrusive and extrusive basalts.
has thickness description: 450m
has upper boundary definition: Overlain by acid tuffs of Upper Rhyolitic Tuff Formation.

Basal Quartz Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BQS
has current status: CURRENT
has theme: BEDRCK
notation: BQS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41975
has lithology component: BQS BREC
has lithology component: BQS CONG
has lithology component: BQS MDST
has lithology component: BQS SDST
has source info: BQS_50545
broader: Arbuthnott-Garvock Group
has lower boundary definition: Unconformable on rocks of the Dalradian Supergroup.
has geographical distribution: Isle of Arran.
has lithology description: Quartz and schist breccia, with beds of sandstone, red and grey shale, and subsidiary quartz conglomerate.
has thickness description: 240 m thick.
has upper boundary definition: The base of the Auchencar Sandstone Formation.

Brunton Quarry Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BQSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: PMCM

Bradford Four Foot Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BR4FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BR4FT COAL
has lateral equivalent: BR4FT st 137
has obsolete equivalent: BR4FT mn 566
broader: PUCM

Branxton Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BRA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRA COAL
broader: LCMS

Bradford Coal Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: PUCM

Brae Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRAE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JV
broader: HMBG

Brae Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: BRAEP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BRAEP DI
has lithology component: BRAEP GD
has lithology component: BRAEP GN
has lithology component: BRAEP HBT
has lithology component: BRAEP PXT
has lithology component: BRAEP SEPITE
has lithology component: BRAEP WEBS
broader: SHEGR

Braid Hills Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRAI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BRAI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41976
has lithology component: BRAI AND
has lithology component: BRAI BATUF
has lithology component: BRAI TRBI
has source info: BRAI_49223
has source info: BRAI_49427
has source info: BRAI_50620
has source info: BRAI_51146
has source info: BRAI_52986
has obsolete equivalent: BRAI mn 1513
broader: PDH
has lower boundary definition: At base of impersistent bed of basaltic tuff, which is possibly unconformable on olivine basalt of the Fairmilehead Member.
has geographical distribution: From Comiston Road [NT 242 695] in the west to Alnwickhill Camp [NT 264 690] in the east, and from Mortonhall Golf Club House [NT 245 693] in the south to the Hermitage of Braid [NT 260 703] in the north.
has lithology description: Thin basal bed of basaltic tuff overlain by flows of highly altered biotite-trachyte and ?biotite-andesite.
has thickness description: 140m
has upper boundary definition: At top of highest flow of trachyte or biotite andesite where overlain by pyroxene andesite of the Blackford Hill Member.

Bracklesham Group [Obsolete Code: Use Brb]
type: Concept
in scheme: NamedRockUnit
alternative label: BRAK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: NE

Brora Arenaceous Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRARE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: NE
narrower: SWKSI

Brora Argillaceous Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRARG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
has obsolete equivalent: BRARG mn 630
broader: NE
narrower: Cadh-An-Righ Shale Member
narrower: Fascally Siltstone Member
narrower: Brora Brick Clay Member
narrower: Brora Shale Member
narrower: Glauconitic Sandstone Member

Boreray Basic Magmatic Breccia Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BRAY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: BRAY GB
has lithology component: BRAY MCGB
broader: STKI

Bracklesham Group
type: Concept
in scheme: NamedRockUnit
alternative label: BRB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BrB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41977
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41978
has lithology component: BRB CLAY
has lithology component: BRB LIGN
has lithology component: BRB SANDU
has lithology component: BRB SILT
has source info: BRB_49217
has obsolete equivalent: BRB mn 541
has obsolete equivalent: BRB mn 562
has obsolete equivalent: BRB BRB
has obsolete equivalent: BRB mn 563
has obsolete equivalent: BRB mn 564
is obsolete equivalent of: BRB BRB
broader: NP
narrower: Earnley Sand Formation
narrower: Earnley Sand Formation And Marsh Farm Formation (Undifferentiated)
narrower: SLSY
narrower: WIDS
narrower: WTT
narrower: PMFE
narrower: POOL
narrower: Camberley Sand Formation
narrower: MARF
narrower: Branksome Sand Formation
narrower: Branksome Sand Formation And Selsey Sand Formation (Undifferentiated)
has lower boundary definition: Marked lithological change from interbedded wavy-, flaser- and lenticular-bedded glauconitic fine-grained sand and silty clay above to dark grey bioturbated silty clay with thin ironstones of the uppermost London Clay Formation below.
has geographical distribution: Eastern Part of Hampshire Basin.
has lithology description: Interbedded laminated silts and silty clays; and sands and silty sands, locally shelly.
has thickness description: c.120m
has upper boundary definition: Topmost bed of Group is the `Tellina Bed' (White, 1921) in the Selsey Sand Formation, composed of trough cross-laminated fine- to very fine-grained sandstone. It is overlain by olive grey glauconitic sandy clays of the Barton Clay Formation.

Bracklesham Group And Barton Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BRBA
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: BRBA CLAY
has lithology component: BRBA LIGN
has lithology component: BRBA SANDU
has lithology component: BRBA SILT
broader: NP

Better Bed Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BRBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRBC COAL
has lateral equivalent: BRBC st 385
broader: PLCM
has geographical distribution: West to South Yorkshire area, probably extending into North Derbyshire as the Grenoside Sandstone Coal.
has lithology description: The Better Bed Coal is a thick, widespread, high quality bituminous coal that has been worked extensively in the district. It is low in ash and sulphur. Mudstone that forms its roof is rich in fish and plant remains.

Barbae Grits
type: Concept
in scheme: NamedRockUnit
alternative label: BRBG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Broubster Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRBU
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41979
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41980
has lithology component: BRBU CLAY
has lithology component: BRBU DIAMIT
has lithology component: BRBU SANDU
has source info: BRBU_50567
has source info: BRBU_50762
has source info: BRBU_52025
has obsolete equivalent: BRBU mn 3492
has obsolete equivalent: BRBU mn 3523
broader: REBU
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Caithness and Sutherland, mainly east of a line between Reay and Berridale (1:50 000 sheets 115 E and W, and sheet 110).
has lithology description: Diamicton, clayey and sandy, typically reddish brown to moderate brown, with clasts of Orcadian Devonian sandstones, conglomerates, siltstones and mudstones, some Caledonian igneous and Moine metamorphic rocks.
has thickness description: Up to 10 m thick.
has upper boundary definition: Holocene strata.

Brandsby Roadstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRBY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: SCR

Ballyreagh Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRC
has current status: CURRENT
has theme: BEDRCK
notation: BRC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41981
has lithology component: BRC CONG
has lithology component: BRC SDST
has source info: BRC_50650
has source info: BRC_50722
has obsolete equivalent: BRC GOCF
has obsolete equivalent: BRC mn 1262
broader: KILS
has lower boundary definition: First appearance of conglomerates and pebbly sandstones above underlying Topped Mountain Sandstone Formation, gradational.
has geographical distribution: Southwestern part of the Fintona Block, Northern Ireland.
has lithology description: Sandstones and conglomerates; coarse, grey-green, purple-stained, matrix supported, cobbles of mainly greywacke and rhyolite.
has thickness description: At least 350 metres.
has upper boundary definition: Conglomerates and coarse-grained sandstones become thinner towards the top, replaced by an increasing proportion of fine-grained sandstones and mudstones; gradational to Ballinamallard Mudstone Formation.

Brooch Coal (South Staffordshire) [Superfluous Code: Use Broo]
type: Concept
in scheme: NamedRockUnit
alternative label: BRCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRCH COAL
broader: PMCM

Burton Cliff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
is obsolete equivalent of: BRCL LLSW
broader: NE

Braemore Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BRCO CONG
broader: SAR

Bryncroes Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Br
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41982
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41983
has lithology component: BRCS CONG
has lithology component: BRCS MDST
has lithology component: BRCS SDST
has source info: BRCS_48886
has source info: BRCS_50546
has source info: BRCS_50909
has obsolete equivalent: BRCS WGB
has obsolete equivalent: BRCS mn 3737
broader: NFR
has additional age information: Arenig (Fennian in upper part).
has lower boundary definition: Unconformable on the metamorphosed and igneous rocks of the Sarn Complex.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: A conglomeratic basal division grading upwards into thinly interbedded and interlaminated sandstones and mudstones.
has thickness description: 200m
has upper boundary definition: Overlain by siltstones, mudstones and oolitic ironstones of the Trygarn Formation. The boundary, which is possibly a disconformity or non-sequence, is defined by the first oolitic ironstone bed within the Trygarn Formation.

Brodick Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: BRDB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PU
has lithology component: BRDB BREC
has lithology component: BRDB LAVA
has lithology component: BRDB TUF
broader: NRS

Bridlington Crag
type: Concept
in scheme: NamedRockUnit
alternative label: BRDC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: BRDC SANDU
has lithology component: BRDC SILT
has lithology component: BRDC SNSH
broader: NE
has lithology description: Silty sand, green-grey, rarely shelly. [Generic description: academic papers and BGS Memoirs].

Bridgend Flags
type: Concept
in scheme: NamedRockUnit
alternative label: BRDF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Bridge Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BRDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: BRDL LMST
broader: Alston Formation

Blind Rock Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: BRDY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Breakyneck Scar Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BRE
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41984
has lithology component: BRE LMST
has lithology component: BRE MDST
has source info: BRE_52957
has obsolete equivalent: BRE mn 2828
broader: Great Scar Limestone Group
has additional age information: Early Arundian.
has lower boundary definition: (Contact between this formation and the Brownber Formation is exposed at NY 6103 0923 and NY 6125 0925, but the former is only c.25m thick there).
has geographical distribution: Not defined.
has lithology description: Dark grey, bioclastic, unevenly bedded limestones with interbedded dark grey shaly mudstones. (Between underlying dolomites, oolites, conglomerates and sandstones of the Brownber Formation and overlying orthoquartzites of the Ashfell Sandstone.
has thickness description: Approx. 150 metres. Thinning rapidly westwards to c.75 metres north of Newbiggin on Lune and c.25 metres near Howe Nook, Orton.
has upper boundary definition: Cannot be defined precisely.

Brecks Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BRECK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41985
has lithology component: BRECK COAL
has source info: BRECK_49515
broader: PUCM
has lower boundary definition: The Dalton Rock lies some distance stratigraphically just below the base of this unit.
has geographical distribution: The Barnsley and Sheffield districts of Yorkshire.
has lithology description: Coal
has thickness description: From 0.3 m to 0.9 m thick.
has upper boundary definition: The Wickersley Rock lies some distance stratigraphically just below the base of this unit.

Breedon Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: BREE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Br
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41986
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41987
has lithology component: BREE BREC
has source info: BREE_50020
has source info: BREE_50023
has obsolete equivalent: BREE mn 589
broader: Gunthorpe Member
has lower boundary definition: The lower boundary is where breccia unconformably overlies dolostone of the Carboniferous Limestone; it may also conformably overlie red mudstone/siltstones/sandstones of the Gunthorpe Member, but this relationship has not been observed.
has geographical distribution: Breedon-on-the-Hill to Barrow Hill, South Derbyshire.
has lithology description: Breccia, angular clasts of Carboniferous limestone (dolostone) set in a red-brown, very fine-grained, clayey sandstone matrix.
has thickness description: 0 - 5m
has upper boundary definition: The upper boundary is where typically red-green mudstones, siltstones or sandstones of the Gunthorpe Member overlie breccia.

Breighton Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BREI
has current status: CURRENT
has theme: SPRFCL
notation: BREI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41988
has lithology component: BREI P
has lithology component: BREI SC
has lithology component: BREI SCV
has source info: BREI_50427
has source info: BREI_51378
has obsolete equivalent: BREI mn 590
has obsolete equivalent: BREI mn 3704
broader: YKC
narrower: NABS
narrower: SKIS
narrower: Bielby Peat Bed
narrower: Bielby Sand Member
has additional age information: Late Devensian.
has lower boundary definition: Sharp to gradational (over several tens of cms) transition to underlying clay, silt or sand of the Hemingbrough Glaciolacustrine Formation, gravels of the Pocklington Gravel Formation, or directly to bedrock. A moderate to well developed basal dark brown peat (Skipwith or Bielby Peat Bed) is present in some localities. The presence of sparsley disseminated fine flint gravel is noted close to the lower boundary, particularly towards the Formation's eastern limits (Bielby Sand Member).
has geographical distribution: The Breighton Sand Formation is known to extend across the Vale of York, from the River Ouse in the west, to beyond Holme-on-Spalding-Moor in the east, The sands are known to extend south and north beyond the Selby district.
has lithology description: Dominantly yellow to pale brown and reddish yellow slightly clayey sand to silty sand with a variably developed very dusky red to black compressible peat to clayey sandy peat base. Typically composed of moderately well-sorted medium quartz grains with minor bands of finer, coarser or poorly sorted material, including finely comminuted flint and lithic clasts. Thin beds of clayey sandy peat and poorly developed fine- to medium-grained slightly gravelly clayey sand are noted towards the base of the formation.
has supplementary information: Laterally the unit's boundaries vary from gradual thinning over several hundred metres to abrupt thinning of the sands to give rise to a strong topographic feature. The unit comprises three geographically discreet members: The Bielby Sand Member in th east of the district, the Naburn Sand Member to the north of the Escrick Moraine, and the Skipwith Sand Member to the south of the Escrick Moraine. Geomorphological evidence suggests that a separate fluvial system was associated with the deposition of each sand member. The Biielby Sand Member is assumed to have been deposited by a system flowing south between the Escrick Moraine and the Wolds; the Naburn Sandstone Member was deposited by a system flowing south behind the Escrick Moraine; the Skipwith Sand Member was deposited by a system that broke through the Escrick Moraine, flowing south to meet the east-flowing fluvial system responsible for the extensive spread of Breighton Sand Formation in the south of the district.
has thickness description: Average 1 to 2m but can exceed 6m in some cases.
has upper boundary definition: Typically exposed at surface beneath a thin (0.2 to 0.5m thick) sandy soil or locally overlain by alluvial and aeolian deposits.

Brendon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BREN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bre
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41989
has lithology component: BREN BA
has lithology component: BREN MDST
has lithology component: BREN SMDST
has lithology component: BREN TUF
has lithology component: BREN WACKE
has source info: BREN_48883
has source info: BREN_49446
has source info: BREN_50462
has source info: BREN_51063
has source info: BREN_51408
has source info: BREN_52071
has lateral equivalent: BREN TSL
has obsolete equivalent: BREN BREN
has obsolete equivalent: BREN mn 1855
has obsolete equivalent: BREN LYDD
has obsolete equivalent: BREN mn 4486
has obsolete equivalent: BREN mn 1183
has obsolete equivalent: BREN mn 2840
is obsolete equivalent of: BREN BREN
broader: TEVY
has lower boundary definition: The lower boundary is not seen; all observed contacts are tectonic.
has geographical distribution: Launceston/St Mellion areas (SX 33 73), between Bodmin Moor and Dartmoor, east Cornwall.
has lithology description: Dark grey, locally siliceous, mudstone with laminae and thin beds of siltstone. Scattered packets of blue-grey to grey-green coarse grained greywacke sandstone with interbedded dark grey mudstone. There are locally distributed units of tuff and basaltic lava. As mapped and defined, this formation may include parts of previously contiguous and coeval formations. Further work is needed as this formation may represent a collection of mud-prone Dinantian lithologies brought together tectonically.
has thickness description: 450m+, but more or less due to thrusting.
has upper boundary definition: The upper boundary is not seen; all observed contacts are tectonic.

Bretford Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRET
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41990
has lithogenesis: FLUV
has lithology component: BRET C
has lithology component: BRET S
has lithology component: BRET V
has lithology component: BRET Z
has source info: BRET_49128
has source info: BRET_49129
has source info: BRET_50676
has source info: BRET_50812
has source info: BRET_50918
has source info: BRET_50978
has source info: BRET_51403
has source info: BRET_52088
has source info: BRET_52614
has obsolete equivalent: BRET mn 595
has obsolete equivalent: BRET mn 598
has obsolete equivalent: BRET mn 1573
has obsolete equivalent: BRET mn 1577
has obsolete equivalent: BRET mn 3051
has obsolete equivalent: BRET mn 181
has obsolete equivalent: BRET mn 1571
broader: Warwickshire Avon Valley Formation
narrower: Bretford Sand And Gravel Member, Lower Facet
narrower: Bretford Sand And Gravel Member, Upper Facet
has additional age information: Late Pleistocene (MI Stage ?3 to 2).
has lower boundary definition: Unconformable, commonly channelled base, resting on Wolston Formation or Baginton Formation in upper Avon, or farther downstream (beyond Coventry), Lower Jurassic or Triassic bedrock.
has geographical distribution: Avon Valley and tributaries (BGS Sheets 183, 184, 199, 200, 201, 216).
has landform description: River Terrace.
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold phase sands and gravels that underlie the Avon First Terrace of Tomlinson (1925) and of BGS Maps. Dominated by clasts of "Bunter" quartz/quartzite lithologies with subordinate flint, generally somewhat finer in grade than older members. (See also Compiler's notes under Supplementary Information).
has supplementary information: (A) the unit is referred to here as Bretford Sand and Gravel Member, though in Bowen 1999, and in previous BGS use it was simply Bretford Member. (B) Terrace surface is typically some 2m above the modern Avon alluvial floodplain; locally with a lower facet c.1m above the floodplain, with deposits extending beneath the latter. Best developed in the upper Avon. Correlation with members of the Severn Valley Formation is problematical. (C) The upper boundary is given as "ground surface" though head, colluvium or soil deposits may intervene. (D) All Avon (and Severn) terraces need review; classification of some outcrops on existing maps is dubious. Thus some Previous Names are necessarily approximate. In particular the depiction of this Terrace 1 on maps, particularly in the lower Avon, is suspect. It is divided into 1a and 1b "facets", which might be expected to converge with the Power House (Terrace 1) and Worcester (2) of the Severn, respectively. However the Power House, at least, is [supposedly] below the floodplain at the confluence, whereas patches of Avon Terrace 1, as far down as the confluence, lie 1 to 2m above. Actually depiction of the Severn Terraces might be wrong; some supposed Terrace 2 "islands" in the floodplain are almost certainly Terrace 1. Knock-on implications are that some of Terrace 3 should be 2, and so on.
has thickness description: 0 to 5m
has upper boundary definition: Ground surface.

Bretford Sand And Gravel Member, Lower Facet
type: Concept
in scheme: NamedRockUnit
alternative label: BRETL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: BRETL GRAV
has lithology component: BRETL SANDU
has obsolete equivalent: BRETL mn 596
broader: Bretford Sand And Gravel Member
has landform description: River Terrace.
has lithogenesis description: River Terrace Deposits.

Bretford Sand And Gravel Member, Upper Facet
type: Concept
in scheme: NamedRockUnit
alternative label: BRETU
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: BRETU GRAV
has lithology component: BRETU SANDU
has obsolete equivalent: BRETU mn 597
broader: Bretford Sand And Gravel Member
has landform description: River Terrace.
has lithogenesis description: River Terrace Deposits.

Brathay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BrF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41991
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41992
has lithology component: BRF MDST
has lithology component: BRF SLST
has source info: BRF_49249
has source info: BRF_51423
has source info: BRF_52056
has source info: BRF_52930
has obsolete equivalent: BRF mn 579
has obsolete equivalent: BRF mn 580
broader: TNTH
narrower: Dixon Ground Member
has lower boundary definition: Conformably overlies the Browgill Formation of the Stockdale Group.
has geographical distribution: Southern Lake District and northwest Pennines.
has lithology description: Laminated mudstone and siltstone.
has thickness description: 100-320m
has upper boundary definition: Conformably overlain by the Birk Riggs Formation.

Broom Farm Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRFA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41993
has lithology component: BRFA SLST
has lithology component: BRFA VCSST
has source info: BRFA_52468
broader: Borrowdale Volcanic Group
has lower boundary definition: At sharp upward change from eutaxitic lapilli tuff (Moorside Farm Formation) to bedded sandstone.
has geographical distribution: Seen only in Sellafield BH No.2 (NY00SE/28)
has lithology description: Bedded, generally coarse-grained, pebbly volcaniclastic sandstone with interbeds of laminated fine-grained sandstone and siltstone.
has thickness description: 13.5m (uncorrected for structural dip or borehole deviation from vertical).
has upper boundary definition: Overlain by Bleawath Formation; boundary at change to massive lapilli-tuff.

Burford Coal Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41994
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41995
has lithology component: BRFC COAL
has lithology component: BRFC LMST
has lithology component: BRFC MDST
has lithology component: BRFC SDST
has lithology component: BRFC SEATM
has source info: BRFC_49037
has source info: BRFC_49279
has source info: BRFC_51293
has source info: BRFC_52236
has obsolete equivalent: BRFC mn 688
has obsolete equivalent: BRFC mn 687
broader: Grovesend Formation
has lower boundary definition: In the type section, dark grey, carbonaceous mudstone with basal coal of the Burford Coal Member, overlies conformably grey to red mudstone-dominated succession of the Crawley Member.
has geographical distribution: Oxfordshire Coalfield; proved in the subsurface only.
has lithology description: Grey mudstone, sandstone, seatearth and coal. In the upper part of the member there are several thin Spirorbis limestone beds and the secondary reddening of the succession.
has thickness description: 138 m thick in the type section.
has upper boundary definition: In the type section, reddish brown, blue mottled mudstone with calcareous nodules of the Windrush Member, overlies conformably grey mudstone of the Burford Coal Member. In the Steeple Aston Borehole, the upper boundary is an unconformity, overlain by fine-to-medium-grained sandstones of the Mercia Mudstone Group.

Bottom Ryhope Five Quarter Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BRFQ
has current status: CURRENT
has theme: BEDRCK
notation: BRFQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRFQ COAL
broader: PMCM

Breccia Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BRGL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BRGL GRAV
has lithology component: BRGL SANDU
broader: NE
has lithology description: Gravel derived from the Clent and Kidderminster formations (UK Midlands); angular clasts in a sandy matrix;origin unknown, possibly Head. [Generic description: 1:50 k map margins].

Bridges Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRGP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41997
has lithology component: BRGP SDST
has lithology component: BRGP SLST
has source info: BRGP_49370
has source info: BRGP_51244
has obsolete equivalent: BRGP mn 600
broader: YW
has additional age information: Late Proterozoic.
has lower boundary definition: At the base of the Bridges Formation flaggy siltstones rest conformably upon massive sandstones of the Bayston-Oakswood Formation.
has geographical distribution: Church Stretton and Linley areas, Shropshire.
has lithology description: Mainly purple siltstones and sandstones, commonly laminated and moderately flaggy. Well-marked bedding and higher proportion of silt than in the underlying Bayston - Oakwood Formation.
has thickness description: Averages c.900m
has upper boundary definition: Drawn where flaggy siltstone of the Bridges Formation is unconformably overlain by brown sandstones and conglomerates of the Hoar Edge Grit (Caradoc).

Brandon Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BRGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Br
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BRGR SDST
broader: MARSD

Brown And Grey Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRGS
has current status: CURRENT
has theme: BEDRCK
notation: BRGS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41998
has lithology component: BRGS BREC
has lithology component: BRGS SDST
has lithology component: BRGS SLST
has source info: BRGS_48877
has source info: BRGS_50622
broader: Cowie Sandstone Formation
has lower boundary definition: The base lies at the top of the highest metre-thick red siltstone bed in the Castle of Cowie Member.
has geographical distribution: Stonehaven area.
has lithology description: Soft brown, grey and green, locally pebbly medium-grained quartzo-feldspathic sandstone. Volcaniclastic detritus makes its first appearance in this member.
has thickness description: 233m minimum
has upper boundary definition: At the base of the lowest exposed bed of pebbly volcaniclastic sandstone in the overlying Cowie Harbour Conglomerate Member.

Bouley Rhyolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: JYVO

Beer Head Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRHD
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41999
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42000
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42001
has lithology component: BRHD CALSST
has lithology component: BRHD CARN
has lithology component: BRHD LMST
has source info: BRHD_49014
has source info: BRHD_49084
has source info: BRHD_49631
has source info: BRHD_50220
has source info: BRHD_52274
has obsolete equivalent: BRHD mn 846
has obsolete equivalent: BRHD mn 863
has lateral equivalent: BRHD st 487
has obsolete equivalent: BRHD mn 917
has lateral equivalent: BRHD st 426
has lateral equivalent: BRHD st 665
broader: Grey Chalk Subgroup
has additional age information: Cenomanian. Mantelliceras mantelli to Calycoceras geurangeri Zones.
has lower boundary definition: Disconformable on the burrowed Small Cove Hardground of the Upper Greensand Formation.
has geographical distribution: Confined to the area south of the mid-Dorset Swell in Dorset.
has lithology description: Complex thin sequence of bedded coarse calcareous sandstone, bioclastic limestone, calcarenite and shell-detrital limestone, with a distinct nodularity and well-developed hardgrounds. Glauconitic and phosphatic. Includes the Wilmington Sand Member in calcarenite facies. Subdivision: None herein but defined as comprising the Pounds Pool Sandy Limestone, Hooken Nodular Limestone and Little Beach Bioclastic Limestone members of the Beer Head Limestone Formation of Jarvis and Woodroof (1984).
has thickness description: Up to 10.4m at Hooken Cliffs.
has upper boundary definition: Disconformable at the surface of the Humble Point Hardground with the Pinnacles Member (of Jarvis and Woodroof, 1984), which is the sub-Plenus Marls Member erosion surface.

Brand Hills Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRHI
has current status: CURRENT
has theme: BEDRCK
notation: BRHI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42004
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42002
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42003
has lithology component: BRHI CONG
has lithology component: BRHI MDSST
has lithology component: BRHI MDST
has lithology component: BRHI QAREN
has lithology component: BRHI QWACKE
has lithology component: BRHI SLST
has source info: BRHI_52102
has source info: BRHI_52205
has source info: BRHI_52376
broader: Brand Group
narrower: Stable Pit Member
has lower boundary definition: Lies unconformably on the late Neoproterozoic Hanging Rocks Formation (formerly the Hanging Rocks Conglomerate Member), latter comprising small-pebble conglomerates fining up to grey/purple volcaniclastic siltstone.
has geographical distribution: Crops out from New Plantation (SK 5010 0902) eastwards to Bradgate Park (SK 5340 0999) and northwards to The Brand (SK 5345 1328).
has lithology description: The formation's basal unit is the Swithland Camp Member, composed of purple siltstones and conglomerates. The upper part of the formation is composed of the Stable Pit Member of quartz-arenites and wackes, locally burrowed and cross-bedded.
has thickness description: c.35m
has upper boundary definition: Conformable gradational passage upwards to grey slaty mudstones of the Swithland Formation, believed to be Lower Cambrian in age (e.g. McIlroy, et al, 1998).

Barrhill Group
type: Concept
in scheme: NamedRockUnit
alternative label: BRHL
has current status: CURRENT
has theme: BEDRCK
notation: BRHL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: BRHL CONG
has lithology component: BRHL SLST
has lithology component: BRHL TUF
has lithology component: BRHL WACKE
has source info: BRHL_52489
has obsolete equivalent: BRHL mn 3065
broader: LHG
narrower: KKF
narrower: LRYN
narrower: Blackcraig Formation And Galdenoch Formation (Undifferentiated)
narrower: Blackcraig Formation
narrower: Galdenoch Formation
has lower boundary definition: Rests on Moffat Shale Group.
has geographical distribution: Southern Uplands of Scotland between Leadhills and Glenn App/Carcow Faults.
has lithology description: Sandstone/siltstone turbidite sequence.
has thickness description: c.3000m
has upper boundary definition: Faulted (Glenn App/Carcow Fault).

Bridgnorth Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bri
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42005
has lithology component: BRI SDST
has source info: BRI_51312
has source info: BRI_51805
has source info: BRI_52349
has obsolete equivalent: BRI mn 2523
has obsolete equivalent: BRI mn 1348
has obsolete equivalent: BRI mn 2630
broader: NRS
has lower boundary definition: Unconformable on Coal Measures and interpreted early Permian breccias.
has geographical distribution: Worcestershire, Staffordshire, Shropshire. (Worcester Basin, Stafford Basin).
has lithology description: Cross bedded aeolian sandstones, mainly brick red, soft, medium-grained. Buff mottling common.
has thickness description: 183m in type area. Up to 250m elsewhere.
has upper boundary definition: Unconformably overlain by Kidderminster Formation.

Blocking Rider Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BRIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRIC COAL
broader: PLCM
has lithology description: The Blocking Rider Coal is a thin and impersistent seam that is of no economic significance.

Bridge Limestone [Obsolete Code: Use Brdl]
type: Concept
in scheme: NamedRockUnit
alternative label: BRID
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Brierley Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRIE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42006
has lithology component: BRIE COAL
has lithology component: BRIE MDST
has lithology component: BRIE SDST
has lithology component: BRIE SEATS
has lithology component: BRIE SLST
has source info: BRIE_51376
has obsolete equivalent: BRIE mn 606
broader: PUCM
narrower: Brierley Rock
has lower boundary definition: Base of Brierley Coal.
has geographical distribution: Yorkshire Coalfield.
has lithology description: Grey mudstones, siltstones and sandstones with thin coals.
has thickness description: c.50m
has upper boundary definition: Base of Fourth Cherry Tree Marker (mudstones with bivalves and euestheriids).

Brig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRIG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
broader: Conybeare Group

Brooch Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BRIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Brights Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: BRIS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BRIS COAL
broader: Farrington Member

Brickearth
type: Concept
in scheme: NamedRockUnit
alternative label: BRK
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BRK C
has lithology component: BRK S
has lithology component: BRK Z
is obsolete equivalent of: BRK ROSI
is obsolete equivalent of: BRK LASI
is obsolete equivalent of: BRK ESI
is obsolete equivalent of: BRK BANM
is obsolete equivalent of: BRK ILSI
broader: NE
has lithology description: Varies from silt to clay, usually yellow-brown and massive. [Generic description].

Brackaville Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: BRKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRKC COAL
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Breakish Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRKH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BkL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42007
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42008
has lithology component: BRKH LMST
has lithology component: BRKH MDST
has lithology component: BRKH SDST
has lithology component: BRKH SLST
has source info: BRKH_49488
has source info: BRKH_50543
has source info: BRKH_52125
has source info: BRKH_52507
has source info: BRKH_52629
has obsolete equivalent: BRKH mn 2520
has lateral equivalent: BRKH BFB
broader: LI
narrower: LUSA
has lower boundary definition: Unconformity - diachronous transgression at start of Jurassic.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: The Breakish Formation comprises blue-grey micritic limestone and dark calcareous mudstones within the lower half of the unit. The upper half of the unit consists of bioclastic limestones, ooidal limestone and nodular limestones. Ammonites are rare within the succession, but bivalve and gastropod fragments are common. Bioturbation of the sediments is locally intense. Coral beds exist near Broadford.
has thickness description: 0 to 65m
has upper boundary definition: Abrupt lithology change to sandstone and siltstone.

Branksome Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
has lithology component: BRKS SANDU
has obsolete equivalent: BRKS mn 542
has obsolete equivalent: BRKS mn 540
broader: Bracklesham Group
narrower: Creech Brick Clay Member

Black Rock Limestone Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BRL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42009
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42010
has lithology component: BRL CHRT
has lithology component: BRL DOLO
has lithology component: BRL LMST
has lithology component: BRL MDST
has lithology component: BRL TUF
has source info: BRL_48818
has source info: BRL_49355
has source info: BRL_49797
has source info: BRL_52565
has obsolete equivalent: BRL mn 459
has obsolete equivalent: BRL mn 462
has obsolete equivalent: BRL mn 500
has obsolete equivalent: BRL mn 460
has obsolete equivalent: BRL mn 3265
broader: PEMB
narrower: Brofiscin Oolite Formation
narrower: Friars Point Limestone Formation
narrower: MHVO
narrower: QTHL
narrower: Barry Harbour Limestone Formation
has lower boundary definition: Conformable and taken at the gradational incoming of dark grey fine- to coarse-grained skeletal packstones with scattered mudstone partings of the Subgroup above the interbedded mudstones and skeletal packstones [Cwymyniscoy Mudstone Formation] of the Avon Group.
has geographical distribution: South Pembrokshire [SM 19 90], Gower [SS 50 90], southeast crop of the South Wales Coalfield [ST 17 85], Vale of Glamorgan [ST 00 74], Monmouth and Chepstow [ST 53 93], and Bristol [ST 60 74], areas and the Mendip Hills [ST 50 53]. In Wales, passes northwards into the Clydach Valley Subgroup.
has lithology description: Thin- to thick-bedded, dark grey to black, foetid, fine- to coarse-grained skeletal [mainly crinoid] packstones with subordinate thin beds of shaly argillaceous skeletal packstone and mudstone. Widespread burrowing. Tractional structures and silicified limestones characterise the lowermost part of the Subgroup. Unit of ooidal limestone [Brofiscin Oolite Formation] developed in lower part in Gower, Vale of Glamorgan and east crop of the South Wales Coalfield. The upper part of the Formation is dolomitized in the south, while along the southern and eastern crop of the South Wales Coalfield and in the Monmouth and Chepstow area, the entire Formation is dolomitized. Tuffs developed in the lower part of the Subgroup in the Weston super Mare areas [Middle Hope Volcanic Member]. Subgroup represents deposition in an inner to mid ramp setting with local ooid shoal development.
has thickness description: 500m in the southern Vale of Glamorgan, thinning northwards to 70m in the Monmouth area. 365m in the eastern Mendip Hills, thinning northwards to 158m at Bristol and 104m to the north of Bristol at Cromhall.
has upper boundary definition: The top of the Subgroup is taken at the sharp contact between the dolomitised packstones of the Subgroup and the overlying oolitic grainstones or dolomitised oolite of the Gully Oolite Formation. In the south the junction appears conformable but in the north a thin red clay overlying a palaeokarstic surface is locally present; in such cases the top is taken at the top of the red clay. In the eastern Mendip Hills it is taken at the incoming of pale grey coarse crinoidal limestones of the Vallis Limestone Formation, above the dolomitised packstones of the underlying Black Rock Limestone Subgroup. Little is known about this contact, which needs further investigation. In the Bristol area the top is taken at the junction of the sparsely crinoidal dolomites of the Black Rock Subgroup and the crinoidal limestones of the overlying Sub-Oolite Bed of the Gully Oolite Formation. Little is known about this contact, which needs further investigation.

Briton's Lane Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRLA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42011
has lithology component: BRLA S
has lithology component: BRLA V
has source info: BRLA_49144
has source info: BRLA_51570
has source info: BRLA_52145
has obsolete equivalent: BRLA mn 3174
broader: Albion Glacigenic Group
narrower: Corton Woods Sand And Gravel Member
narrower: STHSG
narrower: TOTL
narrower: Briton's Lane Sand And Gravel Member
narrower: Beacon Hill Sand And Gravel Member
has lower boundary definition: The lower boundary of the formation is erosional, and sands and gravels truncate earlier deposits of the Sheringham Cliffs Formation.
has geographical distribution: The Briton's Lane Formation crops-out across much of northern Norfolk, from Trimingham in the east to Edgefield and Holt in central north Norfolk.
has lithology description: The Briton's Lane Formation consists of several coarse-grained sand and gravel outwash lithofacies that truncate and drape pre-existing sediments in the Cromer and Mundesley districts. No in-situ till deposits have been identified to date, but thrust slabs of till have been recognised at several localities.
has thickness description: Maximum thickness of the formation is estimated to be in the region of 50m.
has upper boundary definition: The Briton's Lane Formation forms the uppermost stratigraphical units in northern Norfolk. However, sporadic palaeosols can be observed within the upper part of the deposit such as at Briton's Lane.

Brodick And Lamlash Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BRLB
has current status: CURRENT
has theme: BEDRCK
notation: BRLB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42012
has lithology component: BRLB BREC
has lithology component: BRLB SDST
has source info: BRLB_52687
broader: NE
has lower boundary definition: Unconformable on Carboniferous to Upper Devonian.
has geographical distribution: Not defined.
has lithology description: Mainly red-brown and yellow sandstones with beds of breccia.
has thickness description: c.500 metres.
has upper boundary definition: Overlain by Auchenhew Beds.

Broadlee Glen Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRLG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BRLG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42013
has lithology component: BRLG MDST
has lithology component: BRLG SDST
has source info: BRLG_50587
has source info: BRLG_52503
has source info: BRLG_52917
has obsolete equivalent: BRLG mn 618
broader: Clyde Sandstone Formation
has lower boundary definition: The base is not seen, but is mapped in Broadlee Glen [NS 2258 7134] and distinguished from underlying strata of the undivided Clyde Sandstone Formation by plant debris and beds of grey mudstone in the Broadlee Glen Sandstone Member (BGS, 1990).
has geographical distribution: South of the River Clyde and also west of the Largs Fault Zone in Strathclyde, Scotland.
has lithology description: Grey and white cross-bedded sandstones with thin lenticular beds of grey mudstone and carbonised plant debris (Paterson and Hall, 1986; BGS, 1990). In the northern part of the Leapmoor Plantation [NS 221 715], it consists of white and cream, trough cross-stratified sandstone with thin lenticular beds of grey siltstone and abundant coalified wood fragments (Paterson et al., 1990).
has thickness description: Greater than 100m
has upper boundary definition: Top - not seen, presumed overlain by Clyde Plateau Volcanic Formation (Paterson and Hall, 1986).

Broomhill Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRLL
has current status: CURRENT
has theme: SPRFCL
notation: BRLL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42014
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42015
has lithology component: BRLL C
has lithology component: BRLL CZ
has lithology component: BRLL DMTN
has lithology component: BRLL S
has lithology component: BRLL V
has lithology component: BRLL Z
has source info: BRLL_49147
has source info: BRLL_49148
has source info: BRLL_50918
has source info: BRLL_51103
has source info: BRLL_51617
has source info: BRLL_52969
has obsolete equivalent: BRLL mn 625
has obsolete equivalent: BRLL mn 627
has obsolete equivalent: BRLL mn 626
broader: MVG
has additional age information: Early Dimlington Stadial.
has lower boundary definition: Unconformity on older Quaternary strata, such as the Baillieston Till Formation, or bedrock, or a glacial deformation boundary.
has geographical distribution: Central Scotland, related to ice streams sourced in the Highlands (in contrast to the Southern Uplands) during the early part of the Dimlington Stadial; more specifically the Glasgow area between Erskine Bridge and Baillieston and also the western Kelvin valley.
has lithology description: The typical lithology is thinly bedded silty clay with wisps, laminae and bands of silt and, locally, sand. The deposit is generally reddish brown with grey or buff silt and sand. Isolated clasts up to 14cm are present and are considered to be dropstones. The deposit is of a hard to stiff consistency and medium to high plasticity. Thin diamicton bands and patches occur locally, with some graded bedding (turbidity flows) and microfaulting. Laminations are probably varves, and might represent 600 to 1000 years of sedimentation.
has thickness description: Veneer to more than 15m.
has upper boundary definition: Unconformity below younger Quaternary strata or, most commonly, a glacial deformation boundary with the overlying glacial diamicton of the Wilderness Till Formation.

Briton's Lane Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRLSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42016
has lithogenesis: GLACI
has lithology component: BRLSG S
has lithology component: BRLSG V
has source info: BRLSG_49145
has source info: BRLSG_51073
has source info: BRLSG_52145
has obsolete equivalent: BRLSG mn 613
broader: Briton's Lane Formation
has additional age information: Mid Pleistocene.
has lower boundary definition: The lower boundary is generally well defined with sands and gravels resting upon an erosion surface that cuts down into and draped over tills of the Sheringham Cliffs Formation.
has geographical distribution: The Briton's Lane Sand and Gravel Member is the most extensive part of the Brition's Lane Formation and forms the elevated sections of the Cromer Ridge between the Glavern Valley, Beeston Regis and Overstrand, north Norfolk. The member also forms some of the large sand and gravel outliers between West Runton and Weybourne and has been traced southwards inland for approximately 10km.
has lithology description: The Briton's Land Sand and Gravel Member consists of horizontal, massive and low angle planar cross-bedded gravels and cobble gravels with thin seams of horizontal and rippled sand. The lithology has a distinctive high flint content (c.85-89%) of which the majority is of non-chatter marked variety (c.78-85%). The gravels also contain a wide range of far-travelled crystalline erratics including rocks of British and Scandinavian provenance.
has thickness description: The maximum observed is 40m.
has upper boundary definition: The Brition's Lane Sand and Gravel Member is commonly exposed at the surface although in places it has a thick palaeosol developed within the upper 2-3m.

Breckells Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42017
has lithology component: BRM BREC
has lithology component: BRM GYPST
has lithology component: BRM HALI
has lithology component: BRM MDST
has source info: BRM_48671
has source info: BRM_50431
has source info: BRM_51470
has source info: BRM_51674
has source info: BRM_52875
has obsolete equivalent: BRM mn 586
has obsolete equivalent: BRM mn 587
has lateral equivalent: BRM DOMU
broader: SIM
has lower boundary definition: Gradational and conformable transition from the interbedded reddish brown and greenish grey mudstones of the Coat Walls Mudstone Member to the dominantly reddish-brown, structureless mudstones of the Breckells Mudstone Member.
has geographical distribution: preserved in the Preesall syncline area, north Fylde peninsula, Lancashire.
has lithology description: Mudstone, reddish-brown, structureless, commonly brecciated, with common halite and gypsum.
has thickness description: 209m seen in Blackpool district, Lancashire (Wilson and Evans, 1990).
has upper boundary definition: Not present at outcrop or in the subsurface, onshore UK.

Bridgewick Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: BRMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Bridgewick Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: BRMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Bridgewick Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: BRMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Burntisland Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BRMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BRMB MDST
broader: NE

Broomhill Main Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BRMN
has current status: CURRENT
has theme: BEDRCK
notation: BrMn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRMN COAL
has lateral equivalent: BRMN st 270
has lateral equivalent: BRMN st 451
broader: PMCM

Braemore Mudstone Formation And Braemore Sandstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BRMS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: BRMS MDST
has lithology component: BRMS SDST
broader: SAR

Braemore Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has lithology component: BRMU CONG
has lithology component: BRMU LMST
has lithology component: BRMU MDST
has lithology component: BRMU SDST
has lithology component: BRMU SLST
has source info: BRMU_48766
has obsolete equivalent: BRMU mn 568
has obsolete equivalent: BRMU mn 1237
broader: SAR
narrower: Den Siltstone Member

Burnside Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42018
has lithology component: BRN CONG
has lithology component: BRN SDST
has source info: BRN_49845
has source info: BRN_50587
has source info: BRN_51134
has source info: BRN_51673
has obsolete equivalent: BRN mn 696
broader: SAG
has lower boundary definition: Unconformable on the Ochil Volcanic Formation.
has geographical distribution: Sheets 40, 48, 49, Fife-Kinross-Leuchars.
has lithology description: Dull red or purple, fine- to very coarse-grained sandstones characterised by the presence of siliceous pebbles, which also form conglomeratic bands.
has thickness description: Up to 160 m thick, in the Lomond Hills area.
has upper boundary definition: Drawn at the conformable upward passage from red or purple, pebbly sandstones of the Burnside Formation, to the brown, yellow, red, purple or cream sandstones of the Glenvale Formation.

Brynloi Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BRNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRNC COAL
broader: SWLCM

Brennand Grit
type: Concept
in scheme: NamedRockUnit
alternative label: BRNG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BrG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42019
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42020
has lithology component: BRNG PESST
has lithology component: BRNG SDST
has lithology component: BRNG SLST
has source info: BRNG_49288
has source info: BRNG_50498
has lateral equivalent: BRNG GGF
has obsolete equivalent: BRNG mn 592
has obsolete equivalent: BRNG mn 593
broader: PENDL
has lower boundary definition: Sharp and erosional on massive bedded sandstone and siltstone of the Pendle Grit Member.
has geographical distribution: South-eastern Lancaster Fells; also western Settle area.
has lithology description: Very coarse, pebbly to medium-grained cross-bedded feldspathic sandstone with minor siltstone beds.
has thickness description: 0 to 330m
has upper boundary definition: Typically sharp at top of rootlet bed beneath base of grey micaceous siltstone and sandstone of the Roeburndale Member.

Bryn Nicol Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRNI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NP
narrower: Bryn Nicol Formation, Coed Ifan Facies
narrower: Bryn Nicol Formation, Pen Derlwyn Facies

Barneil Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRNL
has current status: CURRENT
has theme: BEDRCK
notation: BRNL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42021
has lithology component: BRNL CHRT
has lithology component: BRNL MDST
has source info: BRNL_49784
has source info: BRNL_51574
has obsolete equivalent: BRNL mn 214
has obsolete equivalent: BRNL mn 213
broader: Craighead Volcanic Formation
has additional age information: Late Llanvirn to early Caradoc?
has lower boundary definition: The exact base of the Member is not clearly defined, as the cherts may be interbedded or overlie the lavas. An analogous situation is seen in the Marchburn Formation in the Northern Belt of the Southern Uplands, where lavas and cherts are interbedded with each other, and the cherts are similarly identified as late Llandeilo to early Caradoc, based on conodont evidence.
has geographical distribution: Craighead Inlier, Girvan.
has lithology description: Red bedded chert, associated with pillow lava.
has thickness description: At least 50m
has upper boundary definition: The lavas can be seen to be unconformably overlain by the Craighead Limestone Formation at Craighead Quarry.

Brandon Sandstone Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BRNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BrS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42022
has lithology component: BRNS LMST
has lithology component: BRNS MDST
has lithology component: BRNS SDST
has lithology component: BRNS SLST
has source info: BRNS_49022
has source info: BRNS_49323
has source info: BRNS_50409
has source info: BRNS_52948
has obsolete equivalent: BRNS mn 3714
broader: Charmouth Mudstone Formation
has lower boundary definition: Change from silty mudstone and siltstone of the undifferentiated Charmouth Mudstone Formation into sandstone as above, may be a conglomerate at base; at 171.88m depth in type section Copper Hill Borehole (SK94SE/56).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in the Charmouth Mudstone Formation of north Lincolnshire, or south Leicestershire, where it passes south into mudstone-dominated Charmouth Mudstone Formation.
has lithology description: Pale grey, grey-brown weathering, silty, calcareous, fine sandstone, with shelly lenses, scattered mica grains and abundant burrows. Subordinate siltstone and mudstone beds. Fauna includes bivalves (including Pholadomya and Modiolus), forams, ammonites, belemnites and crinoids. Soil developed on outcrop is sandy, but may contain no brash.
has thickness description: 1 to 4.5m; 4.43m in type section
has upper boundary definition: Change from sandstone-dominated beds into mudstone and siltstone of undifferentiated Charmouth Mudstone Formation; at 167.45m depth in type section Copper Hill Borehole (SK94SE/56).

Brent Group
type: Concept
in scheme: NamedRockUnit
alternative label: BRNT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JB
broader: NE
narrower: Etive Formation
narrower: NESS
narrower: TARB
narrower: RANN
narrower: Broom Formation

Brown's Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BRNV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42023
has source info: BRNV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Bronydd Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRNY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BrF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has obsolete equivalent: BRNY mn 15
broader: NP

Broadlie Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BRO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: BRO COAL
broader: NE

Brora Brick Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BROBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Brora Argillaceous Formation

Brockwell Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BROC
has current status: CURRENT
has theme: BEDRCK
notation: Br
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BROC COAL
has lateral equivalent: BROC st 728
has lateral equivalent: BROC st 68
broader: PLCM

Broad Law Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BROD
has current status: CURRENT
has theme: BEDRCK
notation: BROD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42024
has lithology component: BROD GD
has source info: BROD_50656
broader: SSCGR
has lower boundary definition: Intrusive into Portpatrick Formation, possibly along a fault.
has geographical distribution: Southeast Scotland.
has lithology description: Lenticular granodiorite body c. 1km x 100m, elongated NE - SW.
has thickness description: c. 1km x 100m vertical intrusion.
has upper boundary definition: Intrusive into Portpatrick Formation.

Broom Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BROM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
broader: Brent Group

Bridgeton Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRON
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42025
has lithology component: BRON B
has lithology component: BRON S
has lithology component: BRON V
has lithology component: BRON Z
has source info: BRON_49147
has source info: BRON_49148
has source info: BRON_50918
has source info: BRON_51103
has source info: BRON_51242
has source info: BRON_51617
has source info: BRON_52969
has obsolete equivalent: BRON mn 602
broader: Clyde Clay Formation
has additional age information: Latest Main Late Devensian Stade to Earliest Windermere Interstadial.
has lower boundary definition: The Bridgeton Sand Member rests with angular unconformity on bedrock or older Quaternary sediments. It commonly rests on the Wilderness Till Formation of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup).
has geographical distribution: The Bridgeton Sand Member of the Clyde Clay Formation is recognised in the lower Clyde valley west of Hallside/Greenoakhill (NS 670 600) downriver at least to near Erskine Bridge (NS 460 720).
has lithology description: The two typical lithofacies are beds of very fine- to medium-grained sand, and fine to coarse gravel and boulders with a sandy matrix. The deposit is loose to dense. At Shieldhall (Browne and McMillan, 1989a, Figure 19), west Glasgow, the Member showed a gross upward-fining succession of about 20m thickness. The sands and silts showed flat bedding, ripple-lamination and climbing ripple-lamination, and planar and trough cross-bedding (westward transport). There were indistinct channels filled with massive sand, and two discrete ones up to 2m thick (width not known) containing framework-supported fine to very coarse gravel. Microfaulting was rarely seen and consisted of small reversed faults. There was evidence of soft sediment deformation, in that these deposits and the overlying laminated clays, originally flat-lying, dipped centroclinally into basins at angles up to as much as 80 degrees. This member forms the basal part of the Clyde Clay Formation.
has supplementary information: The Bridgeton Borehole (Browne and McMillan, 1989a, Figure 18) is the standard but incomplete section of the Bridgeton Sand Member) between 29.31 and 40.38m in depth (base of bore). Its stratigraphical relationships and geographical distribution are summarised in ibid (Figures 2B, 3C, D and 4A).
has thickness description: Veneer to over 20 metres.
has upper boundary definition: The Bridgeton Sand Member is overlain unconformably or disconformably by younger Quaternary sediments, normally the Paisley Clay Member of the British Coastal Deposits Group or the Clyde Valley Formation of the Britannia Catchments Group (Clyde Catchment Subgroup). It is almost always concealed below younger sediments throughout its area of occurrence.

Brooch Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BROO
has current status: CURRENT
has theme: BEDRCK
notation: Br
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BROO COAL
has lateral equivalent: BROO st 823
broader: PMCM

Brora Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: BROR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bror
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JC
has lithology component: BROR GLSST
has lithology component: BROR MDST
has lithology component: BROR SDST
has lithology component: BROR SLST
has source info: BROR_49402
has lateral equivalent: BROR st 149
has obsolete equivalent: BROR mn 631
has obsolete equivalent: BROR mn 632
broader: Brora Argillaceous Formation
narrower: Brora Roof Bed

Brora Roof Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BRORO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Brora Shale Member
has additional age information: Proplanulites koenigi Subzone of the Sigaloceras calloviense Zone.

Broadstone Sand Member And Oakdale Sand Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BROS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BROS SANDU
broader: POOL

Broughton Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BROU
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BROU COAL
broader: NE

Bruar Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Brur
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42026
has lithology component: BRPS PEL
has lithology component: BRPS PSAMM
has lithology component: BRPS QZITE
has lithology component: BRPS SEMPEL
has source info: BRPS_50001
has source info: BRPS_50024
has source info: BRPS_50027
has source info: BRPS_51142
has obsolete equivalent: BRPS mn 2089
is obsolete equivalent of: BRPS GCKP
broader: Blair Atholl Subgroup
has lower boundary definition: Base not exposed in core of Meall Reamhar Synform; north of Allt a'Chireachan may pass downwards into Drumochter Succession.
has geographical distribution: In core of Meall Reamhar Synform from near Dalriach [NN 745 595] via Calvine [NN 805 658] and the Water of Bruar to at least the northern margin of Sheet 55W. Also extends westwards at least as far as the Allt a'Chireachain [NN 756 710 - 787 730]. Individual formations are not recognised in the north-western part of Sheet 55W.
has lithology description: Psammite, both thickly-bedded quartz-rich types with quartzite layers, and thinly bedded laminated feldspathic types. Contains a few mappable semipelite and pelite units.
has thickness description: >600m
has upper boundary definition: Gradational boundary with overlying Tummel Quartzite Formation.

Barren Red Member (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: BRR
has current status: CURRENT
has theme: BEDRCK
notation: brr
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42027
has lithology component: BRR MDST
has lithology component: BRR SDST
has lithology component: BRR SEATM
has source info: BRR_49279
has source info: BRR_51436
has source info: BRR_52591
has obsolete equivalent: BRR mn 266
has obsolete equivalent: BRR mn 267
has obsolete equivalent: BRR mn 246
broader: Grovesend Formation
has lower boundary definition: The base of the red and grey mottled mudstone of the Barren Red Member rests conformably on the uppermost coal seam of the grey, Farrington Member, dominated by the grey mudstone and subordinate sandstone. The coal seam may not be the same between coalfields.
has geographical distribution: Bristol, Somerset and Severn coalfields.
has lithology description: Red and grey mottled mudstone, seatearth, 'Pennant' type lithic sandstones, but no coal seams.
has thickness description: Up to 230 m thick in the Radstock Syncline and 275 m thick in the Coalpit Heath Syncline.
has upper boundary definition: The top of the grey mottled mudstone of the Barren Red Member is overlain by the base of the Nine-Inch Vein Coal of the grey mudstone-dominated Radstock Member in the Somerset Coalfield.

Brown Rake Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BRRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRRC COAL
has lateral equivalent: BRRC st 449
broader: PLCM

Brockwell Rider Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BRRI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRRI COAL
broader: PLCM

Brownstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Brs
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42028
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42029
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42030
has lithology component: BRS AROC
has lithology component: BRS CONG
has lithology component: BRS MDST
has lithology component: BRS SDST
has source info: BRS_48768
has source info: BRS_48937
has source info: BRS_50063
has source info: BRS_50461
has source info: BRS_50474
has source info: BRS_51233
has source info: BRS_52830
has source info: BRS_52953
has obsolete equivalent: BRS mn 644
has obsolete equivalent: BRS mn 3512
has obsolete equivalent: BRS mn 643
broader: LORS
has lower boundary definition: (1) Where sandstones become dominant over mudstone in the underlying St Maughans Formation. (2) At colour change from predominantly green sandstone of the Senni Beds below, to red of the Brownstones.
has geographical distribution: South Wales and Welsh Borderlands, as far north as the Clee Hills.
has lithology description: Red, brown and purple fluvial sandstones with red mudstone interbeds.
has thickness description: To 1200m
has upper boundary definition: Where Upper Devonian or Lower Carboniferous beds overlie the Brownstones unconformably.

Braicklaich Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRSA
has current status: CURRENT
has theme: SPRFCL
notation: BS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42031
has lithology component: BRSA GRAV
has lithology component: BRSA SANDU
has lithology component: BRSA SILT
has source info: BRSA_48668
has source info: BRSA_50681
has obsolete equivalent: BRSA GSG
has obsolete equivalent: BRSA mn 571
broader: Alturlie Gravels Formation
has lower boundary definition: Not observed but probably conformable on the Finglack Till Formation.
has geographical distribution: Alturlie Peninsula and the southern shore of the Inner Moray Firth east of Inverness. Sheet 84W.
has lithology description: Sand, silty sand and silt, rhythmically bedded, pale yellowish brown, capped by sand and gravel. Individual beds are generally graded sand/silt couplets, 0.2 to 0.4m thick, with planar or ripple-drift cross lamination. The beds are stacked into packages and are probably glaciomarine cyclopsams.
has thickness description: 7m
has upper boundary definition: Ground surface or sharp, gently undulating, unconformable contact with raised beach deposits.

Brights Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BRSC
has current status: CURRENT
has theme: BEDRCK
notation: Br
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRSC COAL
broader: PLCM

Burghead Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRSF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BRSF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42032
has lithology component: BRSF AROC
has lithology component: BRSF CONG
has lithology component: BRSF MDST
has lithology component: BRSF PESST
has lithology component: BRSF SDST
has lithology component: BRSF SLST
has source info: BRSF_48671
has source info: BRSF_48957
has source info: BRSF_50907
has source info: BRSF_51943
has obsolete equivalent: BRSF mn 689
has obsolete equivalent: BRSF mn 690
broader: NP
has lower boundary definition: Around Lossiemouth the base of the formation is the base of the predominantly waterlain pebbly sandstones unconformably overlying the Upper Old Red Sandstone strata. Farther to the west the formation overlies the Triassic Hopeman Sandstone Formation.
has geographical distribution: Moray Firth area.
has lithology description: Water-lain poorly sorted, brownish to grey arkosic pebbly sandstone; fine- to coarse-grained. Commonly cross-bedded or laminated, some massive. Some conglomerate beds and beds with common mudstone interclasts. Few siltstone beds.
has thickness description: Up to 73 m.
has upper boundary definition: The top of the formation is the base of the aeolian beds belonging to the Lossiemouth Sandstone Formation or, where that is absent, the base of the Stotfield Cherty Rock Formation.

Brooksby Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BRSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: BC
has youngest age: BC
broader: NE

Bronsil Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BSh
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42033
has lithology component: BRSH MDST
has source info: BRSH_49308
has source info: BRSH_50978
has obsolete equivalent: BRSH mn 621
broader: NP
has lower boundary definition: Probably conformable with White-leaved Oak Shale.
has geographical distribution: Around Bronsil (SO 750 374), south end of Malvern Hills.
has lithology description: Fissile silver-grey mudstone.
has thickness description: Probably 250m - 350m.
has upper boundary definition: Faulted or unconformity.

Brays Silts Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42034
has lithology component: BRSI SILT
has source info: BRSI_49317
has source info: BRSI_49318
broader: NE
has lower boundary definition: Base of palaeochannel cut in bedrock.
has geographical distribution: The Brays sand and gravel pit, near Mathon, Hereford and Worcester.
has lithology description: Greenish grey organic silts rich in an interglacial flora and fauna.
has thickness description: Up to c.1 metre.
has upper boundary definition: Erosion surface overlain by Mathon Sand and Gravel.

Birstall Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BRSR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRSR SDST
has obsolete equivalent: BRSR mn 1147
has lateral equivalent: BRSR st 633
broader: PLCM
has geographical distribution: West Yorkshire area [Birstall, Yorkshire].
has lithology description: The Birstall Rock is a fine-grained, thickly bedded, cross bedded sandstone with common pebbles of ironstone, coal sandstone and mudstone, and common streaks of shaly coal.
has thickness description: To c.30m

Brassy Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: BRSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRSY COAL
broader: PMCM

Brithion Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: OE
has youngest age: OE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42035
has lithology component: BRT BREC
has lithology component: BRT TUF
has source info: BRT_48777
has source info: BRT_49163
has obsolete equivalent: BRT mn 612
has obsolete equivalent: BRT mn 1128
broader: Aran Volcanic Group
has lower boundary definition: Sharp but conformable contact with underlying mudstones of the Aran Volcanic Group.
has geographical distribution: Harlech district.
has lithology description: Volcanic breccias and felsic, welded ash-flow tuffs.
has thickness description: To 75m, but the formation wedges out southwestwards and northwards.
has upper boundary definition: Conformably overlain by undivided siltstones of the Aran Volcanic Group.

Broadstone Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRTC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GL
has predominant age: GL
has youngest age: GL
has lithology component: BRTC CLAY
broader: POOL

Barton Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has lithology component: BRTL LMST
has obsolete equivalent: BRTL mn 276
has obsolete equivalent: BRTL mn 277
broader: TQL

Broadstone Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BRTS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BRTS SANDU
broader: POOL

Brunel Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has obsolete equivalent: BRU mn 645
is obsolete equivalent of: BRU OGH
broader: NE

Barrule Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42036
has lithology component: BRUL MDST
has source info: BRUL_50459
has source info: BRUL_50554
has source info: BRUL_51128
has source info: BRUL_51179
has source info: BRUL_52552
has obsolete equivalent: BRUL mn 271
has obsolete equivalent: BRUL mn 272
broader: MANX
has lower boundary definition: Faulted at the base against the Maughold Formation, which is distinguished by the loss of any sandstone/siltstone interbeds.
has geographical distribution: Isle of Man.
has lithology description: Dark grey to black mudstone.
has thickness description: Up to 900 m thick.
has upper boundary definition: In stratigraphical contact at the top with the Injebreck Formation, which is marked by a change from a mudstone/sandstone facies to a mudstone-dominated facies.

Brunachan Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRUN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BRUN PSAMIF
has lithology component: BRUN QZITE
broader: Glen Spean Subgroup

Brunton Quarry Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BRUQ
has current status: CURRENT
has theme: BEDRCK
notation: BQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRUQ COAL
broader: PMCM

Broad Vein Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OW
has predominant age: OW
has youngest age: OW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42037
has lithology component: BRV SLMDST
has source info: BRV_51180
has source info: BRV_51882
has source info: BRV_52488
has obsolete equivalent: BRV mn 615
has obsolete equivalent: BRV mn 3516
has obsolete equivalent: BRV mn 616
broader: Abercorris Group
has lower boundary definition: No lower boundary is exposed but the pale-medium blue mudstones of the Formation rest with sharp contrast upon the black mudstones of the Nod Glas Formation.
has geographical distribution: Passes west into Cardigan Bay. The outcrop of the Broad Vein Formation crosses sheet 149 diagonally from southwest - northeast (Tywyn - Aberllefenni).
has lithology description: Pale-medium blue, silty-mudstone, intensely bioturbated in parts.
has thickness description: 400 to 560m
has upper boundary definition: The upper boundary can be examined at Aberllefenni Quarry, where the contact is transitional, over 0.5m, from the pale-blue of the Broad Vein Mudstone Formation to a medium-blue, laminated silty mudstone of the Narrow Vein Mudstone Formation, accompanied by the development of lamination.

Brass Vein Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BRVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: BRVC COAL
broader: NE

Bricklieve Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRVE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Browgill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BRW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42038
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42039
has lithology component: BRW CAMDST
has lithology component: BRW MDST
has lithology component: BRW SLST
has source info: BRW_48695
has source info: BRW_52056
has source info: BRW_52933
has obsolete equivalent: BRW mn 635
has obsolete equivalent: BRW mn 636
has obsolete equivalent: BRW mn 2288
broader: STK
narrower: Hebblethwaite Member
narrower: Far House Member
has lower boundary definition: Conformably overlies the Skelgill Formation.
has geographical distribution: Southern Lake District and northwest Pennines.
has lithology description: Laminated mudstone, siltstone and calcareous shale.
has thickness description: About 30m
has upper boundary definition: Conformably overlain by the Brathay Formation.

Brow Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BRWV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42040
has source info: BRWV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Brixham Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRXL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has lithology component: BRXL LMST
has obsolete equivalent: BRXL mn 614
broader: TBAY
narrower: SHPT
narrower: Churston Member
narrower: Berry Head Member
narrower: Goodrington Member

Bryans Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: BRY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BRY COAL
broader: LSC

Lower Peat Member [Breydon Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BRY1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: BRY1 CLAY
has lithology component: BRY1 PEAT
broader: Breydon Formation
has lithology description: Peat; two lithologies, 'brushwood' (freshwater) peat and 'phragmites' (brackish water) peat. Locally,as organic-rich clay. [Generic description: from East Anglian data].

Lower Clay Member [Breydon Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BRY2
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: BRY2 SICL
broader: Breydon Formation
has lithology description: Silt and clay; of Flandrian age. [Generic description: 1:50 k map margins].

Middle Peat Member [Breydon Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BRY3
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: BRY3 CLAY
has lithology component: BRY3 PEAT
broader: Breydon Formation
has lithology description: Peat; two lithologies, 'brushwood' (freshwater) peat and 'phragmites' (brackish water) peat. Locally as organic-rich clay. [Generic description: from East Anglian data].

Upper Clay Member [Breydon Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BRY4
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: BRY4 CLAY
has lithology component: BRY4 SILT
broader: Breydon Formation
has lithology description: Clay and subordinate silt. [Generic description].

Upper Peat Member [Breydon Formation]
type: Concept
in scheme: NamedRockUnit
alternative label: BRY5
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: BRY5 CLAY
has lithology component: BRY5 PEAT
broader: Breydon Formation
has lithology description: Peat; two lithologies, 'brushwood' (freshwater) peat and 'phragmites' (brackish water) peat. Locally, as organic-rich clay. [Generic description: from East Anglian data].

Brierley Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BRYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BRYC COAL
broader: PUCM

Breydon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRYD
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42041
has lithogenesis: CLSH
has lithology component: BRYD C
has lithology component: BRYD P
has lithology component: BRYD S
has lithology component: BRYD V
has lithology component: BRYD Z
has source info: BRYD_50254
has source info: BRYD_50255
has source info: BRYD_50256
has source info: BRYD_50956
has source info: BRYD_52036
has obsolete equivalent: BRYD mn 3859
has obsolete equivalent: BRYD ALV
broader: British Coastal Deposits Group
narrower: Lower Peat Member [Breydon Formation]
narrower: Lower Clay Member [Breydon Formation]
narrower: Middle Peat Member [Breydon Formation]
narrower: Upper Clay Member [Breydon Formation]
narrower: Upper Peat Member [Breydon Formation]
has lower boundary definition: Unconformable. Commonly overlies tills and outwash sands and gravels of the Happisburgh and Lowestoft formations and also sands, gravels and silts of the Crag Group. Also overlies gravels of the Yare Valley Formation (as in the type section). In the west of the outcrop the base of the formation locally overlies rocks of the Chalk Group and London Clay Formation (Thames Group).
has geographical distribution: Confined to the valleys of the River Bure and River Yare near Great Yarmouth.
has lithology description: This formation, which underlies much of the marshland in the Great Yarmouth district, is dominated by unconsolidated silt and clay with a shelly marine fauna. Sand is generally a minor component, though locally substantial sand bodies interrupt the argillaceous succession. Peat, of freshwater and brackish origins, is a major component adjacent to much of the marshland margin and particularly in the valleys of the River Yare and tributary streams. If also occurs as three widespread though locally inpersistent layers, at the base of the formation, within it, and at the top, mainly in the marshalnd fringe.
has thickness description: Up to 22m, but thins towards the margins of the outcrop.
has upper boundary definition: At surface. Not overlain by other deposits.

Bottom Ryhope Little Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BRYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRYL COAL
broader: PMCM

Bryncoch Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BRYN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BRYN COAL
has lateral equivalent: BRYN st 268
broader: Grovesend Formation

Bryn Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BRYNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BRYNC COAL
has lateral equivalent: BRYNC st 711
has lateral equivalent: BRYNC st 364
broader: SWLCM

Berry Slade Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BRYS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42042
has lithology component: BRYS CHRT
has lithology component: BRYS DOLO
has lithology component: BRYS LMST
has lithology component: BRYS MDST
has source info: BRYS_49279
has source info: BRYS_49797
has source info: BRYS_50356
broader: PEMB
has lower boundary definition: Taken at gradational boundary between medium- to thick-bedded crinoidal argillaceous packstones with chert nodules and shaly partings of the underlying Black Rock Limestone Subgroup, and the dolomitized reef limestones of the Formation.
has geographical distribution: Castlemartin area [SR 95 98], southwest Pembrokshire. Passes northwards into the Black Rock Limestone Subgroup.
has lithology description: Massive, grey Waulsortian reefs, comprising dolomitised carbonate mudstone with locally abundant spar-filled fenestrae [stromatactoid structure] and sparse crinoid debris. Reefs are locally overlain by and pass into a flank facies comprising thin-bedded dark limestones and dolomites with cherts and thin mudstones. Stratigraphic position of flank facies uncertain and requires further investigation.
has thickness description: 80m at type section in south Pembrokshire.
has upper boundary definition: Taken at junction of massive dolomitised reef limestones of the Formation and the overlying dark limestones with thin mudstones and cherts of the Linney Head Formation. Where the top of the Formation is in flank facies, the boundary is imprecise but taken at the increase in chert content at the base of the Linney Head Formation.

Brassey Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BRYSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BRYSL COAL
broader: NE

Brazilly Coal (Forest Of Dean)
type: Concept
in scheme: NamedRockUnit
alternative label: BRZY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BRZY COAL
broader: NE

Bridgnorth Sandstone Formation [Obsolete Code: Use Bri]
type: Concept
in scheme: NamedRockUnit
alternative label: BS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Blown Sand
type: Concept
in scheme: NamedRockUnit
alternative label: BSA
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BSA S
is obsolete equivalent of: BSA YNYSS
is obsolete equivalent of: BSA DGPS
is obsolete equivalent of: BSA SUTN
is obsolete equivalent of: BSA KNFIG
broader: Aeolian Deposits
has lithology description: Sand, pale brown, fine-grained, uncemented. [Generic description: 'TMOS' procedures].

Blown Sand, 1
type: Concept
in scheme: NamedRockUnit
alternative label: BSA1
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BSA1 SANDU
broader: NE
has lithology description: Sand, pale brown, fine-grained, uncemented; older than 'Blown Sand'. [Generic description: 'TMOS' procedures].

Blackshale And Ashgate Coal (Vale Of Belvoir)
type: Concept
in scheme: NamedRockUnit
alternative label: BSAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSAC COAL
broader: PLCM

Birnam Slate And Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42043
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42044
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42045
has lithology component: BSAG PEL
has lithology component: BSAG PSAMG
has lithology component: BSAG PSAMM
has lithology component: BSAG PSAP
has source info: BSAG_49424
has source info: BSAG_51786
has obsolete equivalent: BSAG mn 439
has obsolete equivalent: BSAG mn 438
broader: SOHI
has lower boundary definition: Not seen.
has geographical distribution: Birnam area.
has lithology description: Slaty pelite and gritty psammite.
has thickness description: Not known
has upper boundary definition: Boundary with unassigned part of Southern Highland Group.

Badenyon Schist And Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42046
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42047
has lithology component: BSAL CALSIR
has lithology component: BSAL LMST
has lithology component: BSAL PSAMM
has lithology component: BSAL QZITE
has lithology component: BSAL SEMPEL
has source info: BSAL_49233
has source info: BSAL_49798
broader: Easdale Subgroup
narrower: TOFU
has lower boundary definition: Top of graphitic pelites of the underlying Glenbuchat Graphitic Schist Formation.
has geographical distribution: 100m to 1.5km-wide outcrop extending N-S from Leadensider Burn, Glenbuchat [NJ338 201] to Cairnagour Hill [NJ330 057]. Also in the Lecht-Delnadamph area, Gordon District. Sheets 75W and 75E.
has lithology description: Schistose psammites and semipelites with minor schistose calc-silicate rock, impure carbonate rock, limestone and quartzite.
has thickness description: Up to 900m (based on outcrop width only, with no allowance for folding etc.).
has upper boundary definition: Truncated by faults and shear-zones of the Portsoy Lineament.

Basket Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BSB LMST
broader: KRW

Bolders Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSBK
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BD
has predominant age: BD
has youngest age: BD
broader: NE

Bishopbriggs Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BSBS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSBS SDST
broader: ULGS

Blackshale Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSC COAL
broader: PLCM

Barney's Cut Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BSCC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BSCC COAL
has source info: BSCC_51867
broader: SCG
has geographical distribution: The area around Barney's Cut (Lewis Burn), Northumberland.

Blackshale Lower Leaf Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BSCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSCL COAL
broader: PLCM

Bastions Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSCO COAL
broader: PLCM

Blackshale Upper Leaf Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BSCU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSCU COAL
broader: PLCM

Belsay Dean Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BSDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSDL LMST
has lateral equivalent: BSDL st 753
broader: SMGP

Bromleysmill Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BSF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42048
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42049
has lithology component: BSF ARLMST
has lithology component: BSF MDST
has lateral equivalent: BSF st 197
has obsolete equivalent: BSF mn 620
broader: NP
has lower boundary definition: Not seen in type area but presumed to rest conformably on Llandovery Purple Shales.
has geographical distribution: Southern and western surround of the Shelve Ordovician outcrops, ie the Camlad Valley.
has lithology description: Mudstone, bedding-fissile, medium-dark grey, variously bioturbated, graptolitic. Sparse thin argillaceous limestone layers with shelly faunas.
has thickness description: May be 500m
has upper boundary definition: Overlain conformably (by rapid passage) by Aston Mudstone Formation. Unnamed dingle (SO 3038 9094).

Bowland Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BSh
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CY
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42055
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42051
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42052
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42053
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42054
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42050
has lithology component: BSG DOLMST
has lithology component: BSG LMST
has lithology component: BSG MDST
has lithology component: BSG SDST
has source info: BSG_49236
has source info: BSG_50903
has source info: BSG_51128
has source info: BSG_51187
has source info: BSG_51862
has source info: BSG_52825
has source info: BSG_52858
has obsolete equivalent: BSG mn 550
has obsolete equivalent: BSG mn 1408
has obsolete equivalent: BSG mn 1898
has obsolete equivalent: BSG mn 2028
has obsolete equivalent: BSG mn 552
has obsolete equivalent: BSG mn 1407
has obsolete equivalent: BSG mn 2027
broader: Craven Group
narrower: SCPT
narrower: SCV
narrower: Berwick Limestone
narrower: Cheddleton Sandstones
narrower: Cravenoceras Brandoni Marine Band
narrower: Cravenoceras Malhamense Marine Band
narrower: MNS
narrower: HUS
narrower: CSMB
narrower: LESH
narrower: PKSL
narrower: PNDS
narrower: KVS
narrower: Harlow Hill Sandstone
narrower: Hind Sandstone
narrower: CMMB
narrower: RL
narrower: Brockholes Sandstones
narrower: Black Limestone (Isle Of Man)
has lower boundary definition: The conformable base upon the Pendleside Limestone Formation in the Craven Basin, on the Widmerpool Formation in the East Midlands, and the Pentre Chert and Cefn-y-Fedw Sandstone Formation in North Wales, on the Hodderense Limestone Formation in the south of the Isle of Man, is taken at the first appearance of black mudstone above variegated mudstones or fine-grained limestones. In south Cumbria the lower boundary of the formation is taken at the base of the Cravenoceras leion Marine Band, where the dark grey to black marine mudstone rests upon thinly interbedded limestones, mudstones and subordinate sandstones of the Alston Formation. The Bowland Shale Formation onlaps onto and eventually, by Pendleian times, extends over the carbonates of the Central Lancashire High (Trawden Limestone Group). In the Craven Reef Belt, in the Malham Cove/Gordale Scar area, the fissile mudstones with nodules and thin beds of ironstone and limestone of the Bowland Shale Formation, rest unconformably and diachronously on the Malham Formation (Great Scar Limestone Group), or Yoredale Group.
has geographical distribution: Widespread in the Craven Basin, including the Lancaster, Garstang, Settle, Clitheroe and Harrogate districts, south Cumbria and the Isle of Man; also in North Wales, Staffordshire and the East Midlands.
has lithology description: Mainly dark grey fissile and blocky mudstone, weakly calcareous, with subordinate sequences of interbedded limestone and sandstone, fossiliferous in more-or-less discrete bands.Furness and Settle areas: thick-bedded, blocky to sub-fissile, dark grey and black, organic-rich mudstone, with subordinate beds of dark grey siltstone, sandstone and pale brown dolomitic limestone. Marine bands are also present. Shows an upwards decrease in carbonate turbidites and a concomitant increase in siliciclastic sandstone turbidites.South Isle of Man: Black claystone with localized deposition of carbonate turbidites, debris flows, olistoliths, volcaniclastic deposits and lavas. At the base of the formation, the Scarlett Point Member comprises cherty and pyritous tabular beds of pale wackestone and lime-mudstone (dolomitized in places), which display gradational boundaries with interbedded black, fissile, blocky claystone. The limestone is burrowed and has inadunate crinoidal lags and scattered ammonoids. At the top of the formation, the Scarlett Volcanic Member is dominated by a series of volcaniclastic debris flows and gravity slides. Claystone rafts and megaclasts are entrained within the volcaniclastic rocks, and carbonate olistoliths and pillow lavas also occur. Between the members, where the formation oversteps the Balladoole Formation (Great Scar Limestone Group), coarse-grained detrital carbonates and debris beds are common. These include erosively based, graded packstone beds, conglomerate, megaclasts and large olistoliths (with reef limestone and ammonoid faunas) derived from the Balladoole Formation. The middle part of the exposed formation comprises black, calcareous, platy claystone with subordinate beds (up to 2 m thick) of dark wackestone, and dark detrital packstone debris. North Isle of Man: Siltstone, claystone and ironstone dominate, but includes two marine bands and five palaeosols.
has thickness description: Generally between 120m and 620m. The formation thickens northeastwards along the axis of the Central Lancashire High, from about 22m in the Roddlesworth Borehole (SD62SE/6), 68m thick in the Holme Chapel Borehole (SD82NE/68), and 102m in the Boulsworth Borehole (SD93SW/14). The underlying Trawden Limestone Group shows a thinning in the same direction (Evans and Kirby, 1999), suggesting the thickening of the Bowland Shale Formation reflects available accommodation space. In the Craven Reef Belt the Bowland Shale Formation is perhaps 30m to 200m thick (see Arthurton et al., 1988, figure 22). In south Cumbria, the Roosecote Borehole (see above) proved the formation to be 130m thick (see Johnson et al., 2001; Rose and Dunham, 1977). On the Isle of Man, the Bowland Shale Formation might be at least 186m thick. In the north Isle of Man, the Shellag Point Borehole [NX 4565 9965] proved only a part of the formation, reaching 27.55m in thickness.
has upper boundary definition: The top of the formation is taken at the base of the Millstone Grit Group over most of the Pennine Basin and at the base of the Morridge Formation in Staffordshire and the East Midlands. The formation shows complex intertongueing with the Morridge and Cefn-y-Fedw Sandstone formations. It is seen as a conformable boundary defined by the base of the lowermost thick feldspathic sandstone of the Millstone Grit Group, or quartzitic sandstone of the Morridge and Cefn-y-Fedw formations, above thick dark grey mudstone of the Bowland Shale Formation.

Bessygill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BSGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Beenham Stocks Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42056
has lithogenesis: FLUV
has lithology component: BSGR CLAY
has lithology component: BSGR GRAV
has lithology component: BSGR SANDU
has obsolete equivalent: BSGR mn 368
has obsolete equivalent: BSGR PLG
broader: KNTV
has lower boundary definition: Erosional base on London Clay.
has geographical distribution: Kennet Basin and adjacent interfluves.
has lithology description: Gravel, variably clayey and sandy.
has thickness description: To 4m
has upper boundary definition: Terrace surface at 100 - 105m OD around Beenham.

Big Smut Coal (Goyt Trough)
type: Concept
in scheme: NamedRockUnit
alternative label: BSGT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSGT COAL
broader: PLCM

Barshaw Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BSHAW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: BSHAW DOLR
has lithology component: BSHAW MCOLGB
broader: WMVAS

Bottom Shuttles Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSHC COAL
has lateral equivalent: BSHC st 135
has obsolete equivalent: BSHC mn 536
broader: PLCM

Ballymaglin Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSHM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: TR
has youngest age: TR
broader: NE

Blackshale Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BSHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSHS DOLR
broader: NE

Buttershaw Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BSHWL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has lithology component: BSHWL LMST
has source info: BSHWL_50695
has lateral equivalent: BSHWL EML
has lateral equivalent: BSHWL RNGL
broader: HOM
has geographical distribution: Found only in the area of the Broughton Anticline. Probablt equivalent to the Embsay Limestone of the Skipton and Lothersdale anticlines, and to the Rain Gill Limestone of the Slaidburn-Ashnott-Middop-Whitewell anticlines farther west.

Basalanhydrit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSHY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: ZG

Bryn Siltstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BSI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OL
has predominant age: OL
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42057
has lithology component: BSI BREC
has lithology component: BSI SDST
has lithology component: BSI SLMDST
has lithology component: BSI SLST
has lithology component: BSI TUF
has source info: BSI_48690
has obsolete equivalent: BSI mn 646
broader: NP
narrower: PGT
has lower boundary definition: Base of siltstones lie with sharp contact on the Pandy Tuff Formation acid ash-flow tuffs.
has geographical distribution: Not defined.
has lithology description: Grey silty mudstones, siltstones and fine-grained sandstones (less well bedded than underlying Teirw Formation), tuffaceous sandstones and sporadic coarse-grained feldspathic tuffs and breccias. Includes, at its top, the Pen y Graig Tuff Member. The Formation is very fossiliferous.
has thickness description: 180m (120 - 180m)
has upper boundary definition: Top of Pen y Graig Tuff Member succeeded by black mudstones of Blaen y Cwm Shale Formation.

Burnside Intrusion (Plug)
type: Concept
in scheme: NamedRockUnit
alternative label: BSIDE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BSIDE TR
broader: SSDLO

Blues Limestones
type: Concept
in scheme: NamedRockUnit
alternative label: BSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
has lithology component: BSL LMST
broader: LULW

Ballanayre Slump Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: BSLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE

Brinsley Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BSLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BSLC COAL
has lateral equivalent: BSLC st 777
broader: PMCM

Bo'ness Lower Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BSLI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSLI FEST
broader: LSC

Ben Suardal Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has lithology component: BSLL DOLO
has obsolete equivalent: BSLL mn 396
broader: SSLL

Barracks Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BSLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BSLS LMST
broader: HON

Brinsley Thin Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: BSLTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BSLTC COAL
broader: PMCM

Blue Lias Formation, Scunthorpe Mudstone Formation And Charmouth Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BSMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
has lithology component: BSMC ARLMST
has lithology component: BSMC FEST
has lithology component: BSMC LMST
has lithology component: BSMC MDST
has lithology component: BSMC PHOST
has lithology component: BSMC SDST
has lithology component: BSMC SLST
broader: LI

Beoil Schist Formation And Meall Dubh Striped Pelite Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BSMD
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BSMD PEL
has lithology component: BSMD PSAMM
has lithology component: BSMD QZITE
has lithology component: BSMD SCH
has lithology component: BSMD SEMPEL
broader: Lochaber Subgroup

Lower Banton Smithy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BSML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSML COAL
broader: LSC

Upper Banton Smithy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BSMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSMU COAL
broader: LSC

Beeston Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSN COAL
broader: PLCM

Bottom Beeston Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSNB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSNB COAL
has lateral equivalent: BSNB st 508
broader: PLCM
has lithology description: The Beeston Bottom Coal is a thick and locally important seam of high quality. It merges to the west with the lower leaf of the Top Beeston to form the Churwell Thick Coal.

Beeston Rider Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSNR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSNR COAL
broader: PLCM

Top Beeston Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BSNT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSNT COAL
broader: PLCM
has lithology description: The Top Beeston Coal is a bituminous coal of high economic importance that was mined principally in the area southeast of Leeds. It splits westwards, the upper part forming the Churwell Thin Coal, the lower portion forming the top of the Churwell Thick.

Older Blown Sand [Continued Use Not Recommended: See Bsa1]
type: Concept
in scheme: NamedRockUnit
alternative label: BSO
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BSO SANDU
broader: NE
has lithology description: Sand, pale brown, fine, uncemented; may contain rare flint pebbles in East Anglia; older than 'Blown Sand' in the same map area. [Generic description: 'TMOS' Procedures].

Budleigh Salterton Pebble Beds Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BSP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42058
has lithology component: BSP CONG
has lithology component: BSP PESST
has lithology component: BSP SDST
has source info: BSP_50540
has source info: BSP_51023
has source info: BSP_51209
has source info: BSP_51322
has source info: BSP_51791
has source info: BSP_52415
has source info: BSP_52910
has obsolete equivalent: BSP mn 670
has obsolete equivalent: BSP mn 672
has obsolete equivalent: BSP mn 3240
has obsolete equivalent: BSP mn 671
broader: SSG
has lower boundary definition: Rests sharply with marked lithological contrast on Aylesbeare Mudstone Group. Probable disconformity at the contact.
has geographical distribution: Extends from Budleigh Salterton on south Devon coast to near Minehead on north Somerset coast.
has lithology description: In Exeter and Newton Abbot districts: predominantly brown horizontally-bedded gravel with subordinate lenticular beds of trough cross-bedded pebbly sand and sand. The gravel is composed of well-rounded pebbles, cobbles and boulders in a coarse to fine gravel and silty sand matrix. The clasts are mainly (84 to 90%) metaquartzite together with porphyry, vein quartz, tourmalinite, and feldspathic conglomerate. From just south of Hillhead (ST 067 136), locally derived Devonian and Carboniferous clasts begin to appear. Near Milverton, the Formation is massive calcareous conglomerate with limestone clasts.
has thickness description: Budleigh Salterton: 30m. Exeter district: 15-20m. Hillhead: 24m. Taunton district: 30-35m.
has upper boundary definition: Ventifact bed at top of the formation is present from Budleigh Salterton to Hillhead: it is overlain by sands or pebbly sands of the Otter Sandstone.

Brockelschiefer Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSR
has current status: CURRENT
has theme: BEDRCK
notation: Bsr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: Bunter Shale Formation

Bass Rock Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BSRK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BSRK TRR
broader: SSDLO

Bo'ness Six Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BSSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSSF COAL
broader: LSC

Beeston Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42059
has lithogenesis: FLUV
has lithology component: BSSG CLAY
has lithology component: BSSG GRAV
has lithology component: BSSG SANDU
has lithology component: BSSG SILT
has source info: BSSG_48797
has source info: BSSG_49169
has source info: BSSG_50334
has source info: BSSG_50370
has source info: BSSG_50614
has source info: BSSG_50665
has source info: BSSG_50918
has source info: BSSG_52267
has source info: BSSG_52386
has source info: BSSG_52543
has source info: BSSG_52767
has obsolete equivalent: BSSG mn 372
has obsolete equivalent: BSSG mn 371
broader: TRVA
has additional age information: Upper Pleistocene (MI Stage 5e to 4). Formerly recorded as "Devensian" in original Informal Lexicon entry by A Brandon, 26/01/1998.The chronology is based upon analogy with an Ipswichian hippo fauna in the correlative Allenton Sand and Gravel of the lower Dove.
has lower boundary definition: Unconformable, commonly channelled base, resting on pe-Quaternary bedrock.
has geographical distribution: Developed principally on the north bank of the Trent near the confluence with the Derwent in which the correlative Allenton Sand and Gravel is well developed. Present to a lesser extent elsewhere on Sheet 141 and 126; also thought to be present upstream on the Trent, Dove and Tame but extent uncertain pending resurvey (Sheet 140, 154, ?124).
has lithology description: Predominantly cold-phase sands and gravels that underlie the Beeston Terrace. Orange-brown sandy gravel, cryoturbated and decalcified in upper part at least, and dominated by rounded pebbles of "Bunter" quartz/quartzite (typically c.80%) with subordinate subangular flint (c.10%), plus minor Triassic and Upper Carboniferous sandstone, Lower Carboniferous chert and silicified limestone; probably contains a moderate proportion of Lower Carboniferous limestone where fresh at depth. Forms a fairly well preserved terrace in the type area, standing c.7m above the Trent alluvium in the type area. Merges into the correlative Allenton Sand and Gravel Member (Derwent Valley Formation), which includes the organic Crown Inn Beds (Ipswichian). Also correlated with the Wanlip Sand and Gravel Member (Soar Valley Formation) and the Fulbeck and ?Scarle Sand and Gravel members (Trent Valley Formation).
has supplementary information: Clayton, Posnansky, etc, wrongly correlated the type Beeston Sand and Gravel with the older Balderton Sand and Gravel downstream, and also (it appears) with the younger Holme Pierrepont Sand and Gravel upstream. The Bassingfield Sand and Gravel of Sheet 126 is, given the fact that it is cleary somewhat degraded, at the right elevation to be Beeston (and too low to be Egginton Common/Balderton) and was correlated with the type Beeston by Clayton, etc. In my opinion it is Beeston Sand and Gravel. However, Lowe (1989) and Charsley et al. have it as a separate entity, presumably because they say it passes down into, and intercalates with sandy pebbly clay which they interpret as a glacial melt-out. But I suspect it more likely that these are contemporaneous head gravels etc. Currently this unit is only distinguished as such on Sheet 141 (Loughborough). It is undoubtedly present upstream, but the distribution shown by Clayton (1953) would seem to be mostly Holme Pierrepont Sand and Gravel. On Sheet 126 (Nottingham) it is named the Bassingfield Sand and Gravel (see above). I would not expect it to be present significantly downstream of Newark because [in my opinion] the river followed the Proto-Trent route at the time, where it is [probably] represented by the Scarle Sand and Gravel.
has thickness description: 0-c.5m.
has upper boundary definition: Ground surface.

Belemnite Sands Member (Skye And Adjacent Areas)
type: Concept
in scheme: NamedRockUnit
alternative label: BSSK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42060
has lithology component: BSSK CASST
has lithology component: BSSK SDST
has lithology component: BSSK SLSST
has lithology component: BSSK SLST
has source info: BSSK_49488
has source info: BSSK_49569
has source info: BSSK_50200
broader: STBA
has additional age information: Lower Callovian.
has lower boundary definition: Marine siltstones and sandstones replace the marine-brackish mudstones of the Upper Ostrea Member.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Siltstones and sandstones with a diverse bivalve fauna, belemnites and rare ammonites. A plesiosaur has also been found. The sandstones are commonly bioturbated, with local, small-scale cross-bedding and flaser bedding. One interpretation of the Member is that it was a migrating offshore sand bar, transgressing over the coastal lagoons described by 'Upper Ostrea Member'.
has thickness description: 5m
has upper boundary definition: Sharp boundary, overlain by bituminous fissile mudstones of the Dunans Shale Member.

Bo'ness Splint Coal (Glasgow Area; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: BSSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSSP COAL
has lateral equivalent: BSSP st 119
broader: LSC

Barn Scar Sand And Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: BSSS
has current status: CURRENT
has theme: SPRFCL
notation: BSS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42061
has lithology component: BSSS CLAY
has lithology component: BSSS GRAV
has lithology component: BSSS SANDU
has lithology component: BSSS SILT
has source info: BSSS_48926
has source info: BSSS_49633
has source info: BSSS_50151
broader: SEAG
has lower boundary definition: Sharp, undulating, draped, unconformable contact with reddish brown stony clay diamicton of the Holmrook Till Member of the Blengdale Glacigenic Formation.
has geographical distribution: Identified only in the vicinity of the Drigg Landfill Site, Holmrook, Cumbria, but probably extends off-shore filling a buried channel.
has lithology description: Thin interbedded and laminated reddish brown and yellowish brown fine- to medium-grained sand, silt and clay with sparse gravel. Disseminated coal fragments present throughout.
has thickness description: To 27m
has upper boundary definition: Sharp, planar, unconformable contact with reddish brown gravelly sandy clay diamicton of the Ravenglass Till Member of the Seascale Glacigenic Formation.

Barney's Cut Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BSST
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BSST SDST
has source info: BSST_51867
broader: SCG
has geographical distribution: The area around Barney's Cut (Lewis Burn), Northumberland.

Ben Stumanadh Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BSSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Binny Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BST SDST
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Blackstone Coal (Stoke)
type: Concept
in scheme: NamedRockUnit
alternative label: BSTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BSTC COAL
broader: NE

Black Stockarton Moor Subvolcanic Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BSTM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has obsolete equivalent: BSTM mn 469
broader: SSCGR
narrower: INGL
narrower: SOCG
narrower: PNHI
narrower: KRBG

Bo'ness Upper Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: BSUI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: BSUI FEST
broader: LSC

St Saviour's Andesite Formation [Redundant Code: Use San]
type: Concept
in scheme: NamedRockUnit
alternative label: BSV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Bottom Saltwick Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BSWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BSWC COAL
broader: PLCM

Bryn Syllty Disturbed Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NGF

Berw Shear Zone
type: Concept
in scheme: NamedRockUnit
alternative label: BSZ
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Bargate Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bt
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42062
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42063
has lithology component: BT SDST
has source info: BT_49006
has source info: BT_50147
has source info: BT_51235
has source info: BT_52419
has source info: BT_52559
has lateral equivalent: BT st 77
has obsolete equivalent: BT mn 248
has obsolete equivalent: BT mn 247
has obsolete equivalent: BT mn 249
broader: SAB
has lower boundary definition: The lower boundary is placed at a burrowed erosion surface where pebbly sand rests on pale grey, well-sorted, fine- to medium-grained, weakly cemented sandstone [Hythe Formation] [Ellison et al. 2002]. Locally, in the Alresford district, it interdigitates with pebbly, glauconite- andlimonite-rich clayey sand [Rogate Member, Sandgate Formation] [Farrant, 2002].
has geographical distribution: Restricted to the Alresford and Guildford districts. It forms a broad plateau south and west of Godalming [SU 95 43]. There are small outliers near Shere [TQ 0780 4730] and Abinger [TQ 1020 4680]. It is discontinuous around Albury Heath [TQ 058 466], Blackheath [TQ 038 464] and Farley Heath [TQ 046 430] and it is restricted to the northeastern part of the Alresford district.
has lithology description: In the Guildford district the Member comprises buff to brown, gritty to ferruginous, cemented, cross-bedded, coarse-grained sandstone with beds of pale grey calcareous sandstone. Locally a pebble bed occurs at the base, with clasts of Hythe Formation, glauconite pebbles, quartz granules, brown phosphatic pebbles and pebbles of Jurassic limestone. Locally, e.g. Milford Bypass [SU 9435 4413] the member is weakly calcareous and chert beds occur, including one at the base. Hard, calcareous sandstone doggers [Bargate Stone] have also been recorded near the top of the unit around Dorking. In the northeast part of the Alresford district it consists of friable, calcareous, glauconitic, fine- to medium-grained sandstones and cemented flagstones.
has thickness description: To 35m in the Alresford district and to 20m in the Guildford district.
has upper boundary definition: In the Alresford district the upper boundary is characterised by a downsection change from grey, friable, well-sorted, fine-grained, glauconitic, weakly cross-bedded sandstone [Pulborough Sandrock Member] to brown, friable, calcareous, glauconitic sandstone, pebbly in part [Farrant, 2002]. In the Guildford district the argillaceous silts and fine- to medium-grained sandstones [Sandgate Formation] rest on brown, gritty, ferruginous, cemented, cross-bedded sandstone with beds of pale grey, calcareous sandstone [Ellison et al., 2002].

Beta Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BTAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BTAC COAL
broader: PMCM

Beinn Totaig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTAIG
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42064
has lithology component: BTAIG BA
has lithology component: BTAIG HAW
has lithology component: BTAIG MUG
has source info: BTAIG_50384
has source info: BTAIG_51743
has source info: BTAIG_51835
has obsolete equivalent: BTAIG mn 559
broader: SKYL
has lower boundary definition: Overlies the Rasmasaig and Beinn Edra formations in northern Skye.
has geographical distribution: Northern Skye.
has lithology description: Alternating flows of alkali basalt with hawaiite and mugearite, showing eruptive alternation between unevolved and evolved lavas respectively. The evolved lava flows are commonly composite with the upper flow margins being strongly plagioclase-phyric.
has thickness description: To 600m
has upper boundary definition: Overlain by the Bracadale Formation.

Betton Shale Formation [Duplicate Code: Use Bet]
type: Concept
in scheme: NamedRockUnit
alternative label: BTB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has obsolete equivalent: BTB mn 415
broader: NE

Ballintoy Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42065
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42066
has lithology component: BTC CHLK
has lithology component: BTC FLNT
has lithology component: BTC LMST
has source info: BTC_52106
has source info: BTC_52212
has obsolete equivalent: BTC mn 4609
has obsolete equivalent: BTC mn 224
broader: UWLF
has additional age information: Campanian. Belemnitella mucronata Zone sensu lato
has lower boundary definition: Conformably overlies `Bed? B of the Larry Bane Chalk Formation. Oldest of the post-Larry Bane Chalk `Subgroup?.
has geographical distribution: Principal outcrop is within the North Antrim and East Antrim (Midland Valley) basins. Oversteps the Larry Bane Formation onto the Southern Uplands, Highland Border and the northernmost part of the Londonderry Shelf.
has lithology description: Limestone (chalk) with small flints scattered in the lower part and small discontinuous tabular flints in the upper part. The formation can be divided two `Beds? (A and B) separated by conspicuous separation planes. The formation is terminated by the `wavy-bedded? Altachuile Breccia (of member? status).
has thickness description: 12.65m at its type site with Bed A 9.65m and Bed B 3.00m.
has upper boundary definition: Conformably succeeded by the Glenarm Chalk Formation above the Altachuile Breccia (Member?).

Brass Thill Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BTCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BTCO COAL
has lateral equivalent: BTCO st 617
broader: PMCM

Brantingham Member
type: Concept
in scheme: NamedRockUnit
alternative label: BTF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bt
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42068
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42069
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42070
has lithology component: BTF CAMDST
has lithology component: BTF LMST
has lithology component: BTF MDST
has lithology component: BTF SDST
has lithology component: BTF SLST
has source info: BTF_50548
has source info: BTF_51511
has source info: BTF_51523
has source info: BTF_51991
has obsolete equivalent: BTF mn 1047
has obsolete equivalent: BTF mn 2088
has obsolete equivalent: BTF mn 577
broader: WWB
has lower boundary definition: Base of sediments as described above resting erosively on mudstone of Oxford Clay or (locally) mudstone, siltstone or sandstone of Kellaways Formation; small phosphatic pebbles at base in some sections.
has geographical distribution: Humberside, Worlaby to Market Weighton (Gaunt et al., 1992)
has lithology description: Pale to medium grey calcareous siltstone with thin lenticular or concretionary sandy and silty limestones and a few thin medium to dark grey mudstone beds; pale to medium grey, fine-grained, silty massive and bioturbated calcareous sandstones developed in lower part.
has thickness description: 0 to c.18m
has upper boundary definition: Base of silty mudstones and mudstones of overlying beds of West Walton Formation undifferentiated.

Bents Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: BTFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
broader: PGP

Beach And Tidal Flat Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BTFU
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BTFU CLAY
has lithology component: BTFU GRAV
has lithology component: BTFU SANDU
has lithology component: BTFU SDSH
has lithology component: BTFU SICL
has lithology component: BTFU SILT
broader: NE
has lithology description: Composite of 'Beach deposits': Shingle, sand, silt and clay; may be bedded or chaotic; beach deposits may be in the form of dunes, sheets or banks, and 'Tidal Flat Deposits': commonly silt and clay with sand and gravel layers; possible peat layers; from the tidal zone. [Generic description].

Buttergask Flagstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BTG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BTG
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42071
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42072
has lithology component: BTG MDST
has lithology component: BTG SDST
has lithology component: BTG SLST
has source info: BTG_49343
has source info: BTG_51673
has source info: BTG_51981
has obsolete equivalent: BTG mn 710
has obsolete equivalent: BTG mn 711
broader: SCN
has lower boundary definition: The top of the Sheriffmuir Sandstone Member, where medium- to coarse-grained sandstones are overlain by fine-grained sandstones and siltstones of the Buttergask Flagstone Member.
has geographical distribution: The Stirling to Alloa area on the south-east limb of the Strathmore Syncline.
has lithology description: Grey and brown, fine-grained interbedded sandstones, siltstones and mudstones.
has thickness description: Up to 270 m thick.
has upper boundary definition: The base of the Dunblane Formation, where the medium- to coarse-grained sandstones overlie a fine-grained sandstone and siltstone sequence.

Brotherton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bth
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42073
has lithology component: BTH ANHY
has lithology component: BTH DOLMST
has lithology component: BTH DOLO
has lithology component: BTH MDST
has source info: BTH_51513
has lateral equivalent: BTH st 738
has obsolete equivalent: BTH mn 634
has obsolete equivalent: BTH mn 2711
has obsolete equivalent: BTH mn 633
has obsolete equivalent: BTH mn 4418
broader: ZG
has lower boundary definition: Upward transition from mudstones of underlying Edlington Formation.
has geographical distribution: Crops out from north Nottinghamshire to north Yorkshire. Pinches out south-west of a line from Worksop to Newark. Equivalent to Seaham Formation of Co. Durham.
has lithology description: Limestone, dolomitic, grey with abundant Calcinema.
has thickness description: 0-20m
has upper boundary definition: Upward passage into Billingham Anhydrite, or, where that is absent, the Roxby Formation.

Bottom Holers Coal (Birmingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BTHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
has lithology component: BTHL COAL
broader: NE

Baddock Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: BTI
has current status: CURRENT
has theme: SPRFCL
notation: BT
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42074
has lithology component: BTI CLAY
has lithology component: BTI DMTN
has lithology component: BTI GRAV
has lithology component: BTI SANDU
has source info: BTI_48667
has source info: BTI_48668
broader: Finglack Till Formation
has lower boundary definition: Unconformable contact with glacitectonised sands and silts of the Ardersier Silts Formation.
has geographical distribution: Ardersier Peninsula, southern shore of the Inner Moray Firth.
has lithology description: Stony, sandy clay diamicton, stratified, yellowish brown, containing clasts mainly of sandstone.
has thickness description: 2m
has upper boundary definition: Ground surface or unconformable contact with overlying Late Devensian Raised Beach Deposits.

Buitenbanken Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTK
has current status: CURRENT
has theme: SPRFCL
notation: BTK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: BTK SANDU
has source info: BTK_48688
broader: NE
has lower boundary definition: Base Holocene.
has geographical distribution: Not defined.
has lithology description: Medium-grained, locally fine- or coarse-grained and locally gravelly sands; sediments represent marine reworking of late Pleistocene fluviatile gravels and shelly marine sands.
has thickness description: Maximum 5 metres, mostly < 2 metres.
has upper boundary definition: Passage from nearshore sediments with Spisula Subtruncata bivalve assemblage to fully marine sediments with Angulus Pygmaeus bivalve assemblage.

Barrock Top Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BTL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: SMGP

Blue Tour Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BTLS
has current status: CURRENT
has theme: BEDRCK
notation: BTLS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: BTLS LMST
has lateral equivalent: BTLS CAL
broader: ULGS

Bottom Tilley Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BTLY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BTLY COAL
broader: PLCM

Bryn Tirion Member
type: Concept
in scheme: NamedRockUnit
alternative label: BTM
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42075
has lithology component: BTM LMST
has lithology component: BTM MDST
broader: LEEL
has lower boundary definition: Rests on skeletal and peloidal limestones of the lower parts of the Tandinas Limestone.
has geographical distribution: Not defined.
has lithology description: Porcellanous limestones (calcite mudstones) with spar filled fenestrae; intercalated thin dark grey shales.
has thickness description: 4 metres; up to 11 metres at Tandinas Quarry and 8.5 metres at Flagstaff Quarry.
has upper boundary definition: Overlain by the Penmon Limestone (massive and rubbly skeletal limestones).

Belle Tout Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: SECK

Belle Tout Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: SECK

Belle Tout Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: SECK

Butterly Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: BTMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: BTMB MDST
broader: MG

Bottom Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BTMC COAL
broader: PLCM

Bottom Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BTMR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Betton Shale Formation And Meadowtown Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: BTMT CALSST
has lithology component: BTMT MDST
has lithology component: BTMT SLST
broader: NE

Bottom Vein Mine Ground (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BTMV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BTMV FEST
broader: SWLCM
has supplementary information: Mine ground is a term used in South Wales to describe an ironstone-rich package of beds (rather than a single, specific bed). Generally such units are not mapped, but a few are delineated on 1:10K scale maps.

Burraton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Btn
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42076
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42077
has lithology component: BTN MDST
has lithology component: BTN SDST
has lithology component: BTN SLST
has source info: BTN_49446
has source info: BTN_51048
has source info: BTN_51063
has source info: BTN_51408
has source info: BTN_52133
has source info: BTN_52415
has obsolete equivalent: BTN mn 755
has obsolete equivalent: BTN mn 3915
has obsolete equivalent: BTN mn 2071
has obsolete equivalent: BTN YF
broader: TAMA
has lower boundary definition: Transitional with Tavy Formation.
has geographical distribution: Mapped on Sheets 348, 337.
has lithology description: Dark grey to black lustrous slaty mudstone with grey siltstone laminae, and subordinate thin to thick medium- to coarse-grained grey-green sandstone beds.
has thickness description: c.100m
has upper boundary definition: Not seen.

Bourton Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BTNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has lithology component: BTNL LMST
broader: NOSL

Brassington Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTON
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Br
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: N1
has predominant age: N1
has youngest age: N1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42078
has lithology component: BTON CLAY
has lithology component: BTON PESA
has lithology component: BTON SANDU
has lithology component: BTON SILT
has source info: BTON_50076
has source info: BTON_50518
has source info: BTON_50614
has obsolete equivalent: BTON mn 3353
broader: NP
narrower: Bees Nest Member
narrower: KHAM
narrower: KLOW
has lower boundary definition: The lower boundary is a sharp, unconformable contact on karstified limestones which form hollows, or 'pockets' for the formation.
has geographical distribution: Confined to scattered pockets on the Carboniferous limestone outcrop, recognised from north of Ramshorn (SK 088 463) to south of Monyash (SK 134 635).
has lithology description: White, pink and yellow siliceous sands with brightly coloured silts and clays, lying in pockets caused by karstic dissolution of Carboniferous limestones. Divided into: Kirkham Member, Bees' Nest Member and Kenslow Member.
has thickness description: Highly variable. 1 - 45m recorded.
has upper boundary definition: Generally not preserved, but where present it is an unconformity upon which rests Quaternary till (boulder clay).

Black Top Coal
type: Concept
in scheme: NamedRockUnit
alternative label: BTOP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BTOP COAL
broader: NE

Bottom Three-Quarter Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BTQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BTQ COAL
broader: PLCM

Bullhurst Rock (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BTR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BTR SDST
broader: PLCM

Beta Rider Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BTRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BTRC COAL
broader: PMCM

Bentleyford Shales Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42079
has lithology component: BTS LMST
has lithology component: BTS MDST
has source info: BTS_48912
has source info: BTS_51006
broader: NE
narrower: Croft Member
has lower boundary definition: Conformable on grey, micaceous shales of the underlying Shoot Rough Road Shales.
has geographical distribution: Shropshire.
has lithology description: Sooty black shales with black bituminous limestone concretions.
has thickness description: 4m
has upper boundary definition: Non-sequence beneath grey to blue shales of the overlying Shineton Shales.

Britannia Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KP
broader: Cromer Knoll Group

Biscathorpe Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BTSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BTSG GRAV
has lithology component: BTSG SANDU
broader: NE

Bunter Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: Bacton Group
narrower: Amethyst Member
narrower: RGST
narrower: Brockelschiefer Member

Buttington Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has lithology component: BTT MDST
broader: NE
has geographical distribution: Long Mountain area.
has thickness description: c.107m

Beinn An Tuim Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BTU CALSIR
has lithology component: BTU PEL
has lithology component: BTU PELSCH
has lithology component: BTU PSAMM
has lithology component: BTU QZITE
has lithology component: BTU SEMPEL
has source info: BTU_48861
has source info: BTU_48862
has source info: BTU_50429
broader: Glenfinnan Group

Bettws Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTWM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: BTWM MDST
broader: NA
has lithology description: Pale greenish grey mottled mudstones.
has thickness description: 130 to 170m

Bettyhill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BTYH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BTYH AMPHB
has lithology component: BTYH GNSKA
has lithology component: BTYH PELGN
has lithology component: BTYH PELMI
has lithology component: BTYH PSMGN
has lithology component: BTYH PSMM
has lithology component: BTYH SPELGN
has lithology component: BTYH SPMM
broader: MORR
narrower: INAV

Bettyhill Suite
type: Concept
in scheme: NamedRockUnit
alternative label: BTYL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BTYL AMPHB
has lithology component: BTYL AMPSCH
broader: NE

Upper Brioverian Group
type: Concept
in scheme: NamedRockUnit
alternative label: BU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Bualintur Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: BUAL BA
has lithology component: BUAL FPBA
has lithology component: BUAL HAW
broader: SKYL

Burtle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUB
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42080
has lithogenesis: GLACI
has lithology component: BUB S
has lithology component: BUB SNSH
has lithology component: BUB V
has source info: BUB_49477
has source info: BUB_49667
has source info: BUB_50403
has source info: BUB_50655
has source info: BUB_50785
has source info: BUB_51537
has source info: BUB_51637
has source info: BUB_51762
has source info: BUB_52266
has lateral equivalent: BUB st 387
has lateral equivalent: BUB st 580
has obsolete equivalent: BUB mn 701
has lateral equivalent: BUB st 456
has obsolete equivalent: BUB mn 700
broader: British Coastal Deposits Group
has additional age information: Mid to Late Pleistocene.
has lower boundary definition: The formation rests upon Jurassic and Triassic bedrock. It commonly overlies or fringes "reefs" or "islands" of Lower Lias or Late Triassic rocks.
has geographical distribution: Restricted to the "Somerset Levels" of northeast Somerset.
has lithology description: Sands and gravels. The sands are fine-grained and quartzose, with beds of comminuted shell. The gravels, which are composed of Chalk flint, quartz, sandstone, cherts, rounded lumps of red, green and grey Triassic mudstones and Liassic fossils, are marine in origin with a few interbedded palaeosols and freshwater sands. They contain fossilised marine, fresh water and terrestrial shells and remains of elephant, rhinoceras, horse, auroch, red, fallow and roe deer, hyaena and wolf. The marine shells indicate both cold and warm water climates and sandy, muddy and rocky habitat, and the freshwater shell Corbicula fluminalis indicates a climate warmer than now. The deposits form low mounds protruding through the surface of the Holocene silts and clays of the Somerset Levels Formation.
has thickness description: c.5m
has upper boundary definition: At surface, or else overlain by Holocene silts, clays and peats of the Somerset Levels Formation.

Burns Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BUBE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BUBE LMST
has lithology component: BUBE MDST
broader: TYLS

Buckie Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BUC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42081
has lithology component: BUC LMST
has lithology component: BUC MDST
has lithology component: BUC QZITE
has lithology component: BUC SDST
has source info: BUC_48957
has source info: BUC_50578
has source info: BUC_52175
has source info: BUC_52293
has obsolete equivalent: BUC mn 662
has obsolete equivalent: BUC mn 663
broader: NP
has lower boundary definition: The unconformity with the Cullen Quartzite Formation.
has geographical distribution: Elgin and Buckie area, Scotland.
has lithology description: Mainly limestone, both bedded and massive; locally pink and concretionary. Towards the base the limestones contain fragments of quartzite and crystals of barytes. Towards the top of the formation it includes thin beds of red mudstone and sandstone, some of which are calcareous.
has thickness description: To 9m
has upper boundary definition: The top of the formation is the unconformity with the Middle Devonian conglomerate (Spey Conglomerate Formation).

Buildwas Formation And Coalbrookdale Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BUCD
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SH
has lithology component: BUCD ARLMST
has lithology component: BUCD CAMDST
has lithology component: BUCD MDST
has lithology component: BUCD PYRR
has lithology component: BUCD SLMDST
has lithology component: BUCD SLST
broader: NA

Bull Crag Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BUCG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BUCG COAL
broader: TYLS

Buchan Formation [Obsolete Code: Use Buhn]
type: Concept
in scheme: NamedRockUnit
alternative label: BUCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: UPOR

Bulldog Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: BUCO
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Bd
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BUCO COAL
broader: NE

Bught Craig Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUCR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: PERG

Buchlyvie Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BUS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42082
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42083
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42084
has lithology component: BUCS CONG
has lithology component: BUCS MDST
has lithology component: BUCS PESST
has lithology component: BUCS SDST
has lithology component: BUCS SLMDST
has lithology component: BUCS SLST
has source info: BUCS_49343
has source info: BUCS_51673
has source info: BUCS_51981
has obsolete equivalent: BUCS mn 4454
broader: THF
has lower boundary definition: A gradational contact with the Dalmary Sandstone Member of the Teith Sandstone Formation, which is generally greenish grey and commonly contains plant remains.
has geographical distribution: The axial region of the Strathmore Syncline between Thornhill and Gartocharn.
has lithology description: A reddish grey, fine- to medium-grained, commonly cross-bedded sandstone, interbedded with siltstone and chocolate brown to brick red, silty mudstone.
has thickness description: At least 400 m thick.
has upper boundary definition: The top is not seen, as it is faulted against and unconformably overlain by the basal conglomerate and sandstones of the Stockiemuir Sandstone Formation, of the Upper Devonian, Stratheden Group.

Beinn Udlaidh Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUDQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BUDQ QZF
has lithology component: BUDQ QZITE
broader: Lochaber Subgroup
has lower boundary definition: First occurance of white to grey quartzite feldspathic quartzite above banded to laminated psammite.
has geographical distribution: Crianlarich Sheet 46W (Scotland)
has lithology description: A white to grey quartzite, locally feldspathic. Pebbly beds with clasts up to several centimetres across, are rare. Cross-lamination is only preserved in areas of low strain.
has thickness description: Variable, ranges from c.100 to 20m, depending on the structural setting.
has upper boundary definition: Change from grey to white quartzite upwards to pelite and semipelite of the Leven Schist Formation.

Buttermere Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BUF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42085
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42086
has lithology component: BUF MDST
has lithology component: BUF SDST
has lithology component: BUF SLMDST
has source info: BUF_49069
has source info: BUF_49070
has source info: BUF_49254
has source info: BUF_49623
has source info: BUF_49625
has source info: BUF_50877
has source info: BUF_51854
has source info: BUF_51922
has source info: BUF_51939
has source info: BUF_51951
has source info: BUF_52384
broader: SKG
narrower: RNM
narrower: Goat Gills Member
has additional age information: Tremadoc to Late Arenig.
has lower boundary definition: Not exposed.
has geographical distribution: It is bounded to the north and northwest by the Causey Pike Fault. To the south and southeast the formation extends to the overlying Borrowdale Volcanic Group unconformity. To the west the extent of the formation is unclear, exposures in the River Calder may be Buttermere Formation or a lower part of the succession.
has lithology description: An olistrostrome deposit comprising disrupted, sheared and folded mudstone, siltstone and sandstone turbidite olistoliths. There are two members near the middle of the Formation, the Goats Gill Member, a sedimentary breccia and the sandstone-dominated Robinson Member.
has thickness description: 1500m+
has upper boundary definition: The upper boundary is tectonic and overthrust by rocks of the Crummock Water Aureole.

Buff Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: BUFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BUFC COAL
broader: SWUCM

Burra Firth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUFF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BUFF PEL
has lithology component: BUFF PSAMM
has lithology component: BUFF QZITE
has lithology component: BUFF SEMPEL
broader: VAFD
narrower: SUNK
narrower: Herma Ness Gneiss Member
narrower: Herma Ness Marble Member
narrower: Gillis Field Microporphyroblast Gneiss Member

Buttermere Formation (Hornfelsed)
type: Concept
in scheme: NamedRockUnit
alternative label: BUFH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O2
has lithology component: BUFH HNFELS
broader: NE
has additional age information: Metamorphism probably Early Devonian.

Buchan Gravels Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUG
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: N1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42087
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42089
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42090
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42088
has lithology component: BUG CLAY
has lithology component: BUG GRAV
has lithology component: BUG MCSND
has lithology component: BUG SANDU
has source info: BUG_49544
has source info: BUG_49920
has source info: BUG_50120
has source info: BUG_50626
has source info: BUG_51299
has source info: BUG_51987
has obsolete equivalent: BUG mn 654
has obsolete equivalent: BUG mn 3344
broader: RESID
narrower: Buchan Ridge Gravel Member
narrower: WING
has lower boundary definition: Unconformable on Neoproterozoic rocks, or on the Moreseat Sandstone Formation.
has geographical distribution: Northeast Scotland.
has lithology description: Well rounded gravel and cobble gravel comprising white quartzite, vein quartz and flint, in white micaceous silty sand matrix or in a white sandy kaolinitic clay matrix.
has thickness description: 10 to 25m+
has upper boundary definition: Unconformable, below till or "head", or at the surface.

Bungilow Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BUGC
has current status: CURRENT
has theme: BEDRCK
notation: Bg
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BUGC COAL
broader: PUCM

Burway Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUGP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42091
has lithology component: BUGP MDST
has lithology component: BUGP SDST
has lithology component: BUGP SLST
has source info: BUGP_49380
has source info: BUGP_50414
has source info: BUGP_50679
has source info: BUGP_50741
has source info: BUGP_52207
has obsolete equivalent: BUGP mn 702
broader: YST
narrower: Buxton Rock Member
narrower: Cardingmill Grit Member
has additional age information: Late Neoproterozoic.
has lower boundary definition: Drawn at the base of silicified dust tuff of the Buxton Rock of the Burway Formation where it rests conformably upon green-grey shales of the Stretton Shale Formation..
has geographical distribution: Near Church Stretton, Shropshire.
has lithology description: Flaggy, green-grey mudstones, siltstones and sandstones. More massive sandstones at some horizons and with some bands of purple-grey siltstone or mudstone.
has thickness description: About 180m
has upper boundary definition: Drawn at the conformable upward passage from coarse green-grey sandstone of the Cardingmill Grit Member of the Burway Formation to purple shaly mudstones and siltstones of the Synalds Formation.

Burnhead Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BUHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: BURN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42092
has lithology component: BUHD GD
has lithology component: BUHD QDI
has lithology component: BUHD TO
has source info: BUHD_48962
broader: SSCGR
has lower boundary definition: Intrusive.
has geographical distribution: Southern Uplands, Scotland.
has lithology description: Minor granitic pluton.
has thickness description: Elongate intrusion c. 1.7km x 0.5km with long axis orientated roughly E - W.
has upper boundary definition: Intrusive.

Buchan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUHN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
broader: UPOR

Buildwas Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUI
has current status: CURRENT
has theme: BEDRCK
notation: Bw
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42093
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42094
has lithology component: BUI ARLMST
has lithology component: BUI CAMDST
has source info: BUI_51375
has source info: BUI_51924
has source info: BUI_52005
has source info: BUI_52329
has obsolete equivalent: BUI mn 673
has obsolete equivalent: BUI mn 4566
broader: NA
has lower boundary definition: Base of the first grey-green, rubbly mudstones containing comminuted shell debris above mottled green, grey and purple mudstones of Rubery Formation. 1m thick transition in colour and upward decrease in number of hard siltstone beds.
has geographical distribution: West Midlands, Welsh Borders.
has lithology description: Olive-green and grey calcareous mudstone and nodular to lenticular calcareous mudstone and argillaceous limestone; shell fragments present throughout.
has thickness description: 22-40m. Walsall 22m; Wenlock Edge 25.5-40m
has upper boundary definition: Gradational increase in thickness and number of limestone beds into overlying Barr Limestone Formation.

Buccleuch Limestone [Obsolete Code: Use Bucc]
type: Concept
in scheme: NamedRockUnit
alternative label: BUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bullhurst Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BULC
has current status: CURRENT
has theme: BEDRCK
notation: Bu
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BULC COAL
broader: PLCM

Bulman Main Coal (Northumberland) [Also Known As Cancer Coal]
type: Concept
in scheme: NamedRockUnit
alternative label: BULMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: BULMA COAL
has lateral equivalent: BULMA st 165
broader: NE

Burdiehouse Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BULS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BULS LMST
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Bulmer Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BULV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42095
has source info: BULV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Buckle Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Buckle Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Buckle Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Buckle Marls (Four)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Buckle Marls (Five)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA5
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Buckle Marls (Six)
type: Concept
in scheme: NamedRockUnit
alternative label: BUMA6
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: NCK

Burn Side Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUN
has current status: CURRENT
has theme: BEDRCK
notation: BUN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42096
has lithology component: BUN CONG
has lithology component: BUN SDST
has source info: BUN_50759
has obsolete equivalent: BUN mn 209
broader: Balclatchie Formation
has lower boundary definition: Base of conglomerate lithology. This is the youngest conglomerate member in the otherwise mudstone-dominated Balclatchie Formation.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Conglomerate and sandstone.
has thickness description: To 60m
has upper boundary definition: Overlain by flaggy sandstones and siltstones of the Ardwell Farm Formation of the Ardwell Subgroup.

Bundoran Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUNS
has current status: CURRENT
has theme: BEDRCK
notation: BUNS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42097
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42098
has lithology component: BUNS CAMDST
has lithology component: BUNS LMST
has source info: BUNS_52183
has obsolete equivalent: BUNS mn 2533
broader: TYRO
narrower: MULY
narrower: Dowra Sandstone Member
narrower: SKEA
has lower boundary definition: Skea Sandstone Member (basal beds of the formation) rest disconformably on top of Ballyshannon Limestone Formation.
has geographical distribution: Northwest Carboniferous basin of Ireland.
has lithology description: Mudstone, dark grey, calcareous, fossiliferous with thin to thick bioclastic limestones.
has thickness description: 80 - 450m
has upper boundary definition: Increasing silt, mica and sand content in top part of formation, beneath coarse sandstones of basal Dromore Member of the Mullaghmore Sandstone Formation.

Buckhaven Planolites Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BUPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CC
broader: UCMS

Buxton Rock Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42099
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42100
has lithology component: BUR TUF
has source info: BUR_50177
has source info: BUR_50366
has source info: BUR_50414
has source info: BUR_50491
has source info: BUR_50574
has source info: BUR_50822
has obsolete equivalent: BUR mn 667
has obsolete equivalent: BUR mn 714
broader: Burway Formation
has additional age information: Late Neoproterozoic.
has lower boundary definition: The Buxton Rock is regarded as the basal member of the Burway Formation.The base is generally sharply defined, usually overlying dark grey mudstones of the Stretton Shale Formation. However, it is not uncommon for turbiditic sandstone facies, characteristic of the Burway Formation, to appear below the Buxton Rock. Lithologies comparable to the Stretton Shale Formation also occur locally up to 15m above the Buxton Rock (Greig et al, 1968; Wilson, 2000).
has geographical distribution: Welsh Borderlands, Shropshire, Church Stretton and the Long Mynd.
has lithology description: Massive, fine-grained silicified tuff.
has thickness description: 7 m thick.
has upper boundary definition: the unit has a sharply defined planar top, usually overlain by thinly interbedded turbiditic sandstones and mudstones of the Burway Formation (but see above).

Buchan Ridge Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BURG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: N1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42102
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42103
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42101
has lithology component: BURG CLAY
has lithology component: BURG GRAV
has lithology component: BURG MCSND
has source info: BURG_50626
has source info: BURG_51221
has source info: BURG_51299
has source info: BURG_51987
has source info: BURG_52094
has obsolete equivalent: BURG mn 655
has obsolete equivalent: BURG mn 3344
broader: Buchan Gravels Formation
has lower boundary definition: Unconformable, on Moreseat Sandstone Formation, Smallburn Sandstone Formation or deeply weathered crystalline basement.
has geographical distribution: Northeast Scotland.
has lithology description: Well rounded cobble gravel composed of flint and white quartzite in a white sandy kaolinitic clay matrix.
has thickness description: At least 25m
has upper boundary definition: Unconformable, below till or 'head', or at the surface.

Burlington Member
type: Concept
in scheme: NamedRockUnit
alternative label: BURL
has current status: CURRENT
has theme: BEDRCK
notation: BURL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42104
has lithology component: BURL SDST
has lithology component: BURL SLMDST
has source info: BURL_49785
broader: HOF
has lower boundary definition: Incoming of turbidite sandstones.
has geographical distribution: Not defined.
has lithology description: Sandstone in laminated silty mudstone.
has thickness description: 30 metres. 15 - 30 metres.
has upper boundary definition: Overlying laminated silty mudstones.

Burradon Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BURN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BURN COAL
broader: PMCM

Burton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BURT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
broader: Dunlin Group

Bure Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BURV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42105
has lithology component: BURV C
has lithology component: BURV P
has lithology component: BURV S
has lithology component: BURV V
has lithology component: BURV Z
has source info: BURV_49110
has source info: BURV_51326
broader: YCAT
has additional age information: Mid Pleistocene to Holocene.
has lower boundary definition: Unconformable on glacial and solifluction deposits and upon Crag Group and Chalk Group bedrock.
has geographical distribution: Valley of River Bure and its tributaries, in North Norfolk, down to its junction with the River Yare near Great Yarmouth.
has lithology description: Formation encompasses the fluvial, lacustrine and organic deposits of the River Bure and its tributaries. It includes alluvium and a restricted development of river terrace deposits. The floodplain alluvium comprises soft clays, silts and fine-grained sands, with bodies of peat, overlying fine- to coarse-grained sands and gravels. River terrace deposits are largely gravel and sand. The gravels are dominated by subangular to rounded flint, including large cobbles, but also include rounded pebbles of quartz and quartzite, northern British erratics of glacial derivation, and a little chalk.
has thickness description: c.5m
has upper boundary definition: Surface.

Bruce Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: HTHE

Bottom Usworth Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BUSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BUSC COAL
broader: PMCM

Bush Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: BUSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BUSH COAL
broader: MCMS

Bussell's Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42106
has lithology component: BUSS MDST
has lithology component: BUSS SDST
has source info: BUSS_50699
has source info: BUSS_51328
has obsolete equivalent: BUSS mn 707
broader: Dawlish Sandstone Formation
has lower boundary definition: Base taken at upward change from coarse-grained pebbly sandstone to clayey sandstone and mudstone at type locality.
has geographical distribution: Outcrop forms low-lying ground, much mantled by superficial deposits, between Stoke Canon [SX 940 980], Columbjohn [SX 960 999], and Francis Court Farm [SX 980 995].
has lithology description: Reddish brown mudstone, sandy mudstone and clayey fine-grained sandstone, weathering to clay, sandy clay, and clayey sandstone. Contains a mappable bed of fine-grained sandstone near Columbjohn (eg SX 963 995).
has thickness description: 24.4m in a borehole [SX 9458 9788] at Huxham Barton; 50m at Bussel's Farm [SX 9529 9873], 1km north-east of Huxham; more than 69m in the Columbjohn Borehole [SX 9584 9964], a further 1km north-east.
has upper boundary definition: Overlain by sandstone of main part of Dawlish Sandstone.

Busty Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BUST
has current status: CURRENT
has theme: BEDRCK
notation: Bu
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BUST COAL
has lateral equivalent: BUST st 678
broader: PLCM

Butterton - Swynnerton Dykes
type: Concept
in scheme: NamedRockUnit
alternative label: BUSW
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: BUSW DOLR
broader: NP

Bute Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BUT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42107
has lithology component: BUT CONG
has lithology component: BUT SDST
has source info: BUT_49286
has source info: BUT_51673
broader: SAG
has lower boundary definition: Not seen, presumed to be unconformable on Lower Devonian.
has geographical distribution: Island of Bute, on sheets 21, 29.
has lithology description: Mainly conglomerate with subordinate red sandstone.
has thickness description: About 1500 m thick.
has upper boundary definition: Sharp junction with the Kinnesswood Formation.

Bute Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BUTE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BUTE COAL
broader: SWMCM

Beinn An Uain Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BUTI
has current status: CURRENT
has theme: SPRFCL
notation: BAU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42109
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42108
has lithology component: BUTI CLAY
has lithology component: BUTI DMTN
has lithology component: BUTI SANDU
has lithology component: BUTI SILT
has source info: BUTI_50681
has source info: BUTI_50834
has source info: BUTI_52490
has obsolete equivalent: BUTI mn 4155
has obsolete equivalent: BUTI mn 4153
broader: Central Grampian Glacigenic Subgroup
narrower: Cantray Till Member
narrower: RNTI
has lower boundary definition: Generally a gradational contact over 10-20cm, or locally a sharp, planar one, with stony, sandy diamictons of the underlying Athais Till Formation, or on bedrock.
has geographical distribution: Sheet 84W (Fortrose), southeast of Inverness.
has lithology description: Stoney sandy clay diamicton, matrix-supported, dark yellowish brown to olive-grey, fissile, massive, extremely compact, containing angular to subrounded clasts of gneissose psammite and semipelite, granite and some Devonian sandstone and siltstone. Typical lodgement till with well developed north-easterly fabric and containing concavo-convex discontinuities that are commonly sand-filled.
has thickness description: 10m
has upper boundary definition: Erosional contact with gravel of the Carn Monadh Gravel Formation at the Allt Odhar Interstadial site, various younger deposits or the ground surface.

Butterton Sandstone Bed
type: Concept
in scheme: NamedRockUnit
alternative label: BUTS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has source info: BUTS_49789
has source info: BUTS_52516
has obsolete equivalent: BUTS mn 712
has obsolete equivalent: BUTS mn 713
broader: Halesowen Formation
has geographical distribution: North Staffordshire.

Butterby Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: BUTTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42110
has lithology component: BUTTI C
has lithology component: BUTTI DMTN
has lithology component: BUTTI S
has lithology component: BUTTI V
has source info: BUTTI_49687
has source info: BUTTI_49811
has source info: BUTTI_50508
has source info: BUTTI_50596
has lateral equivalent: BUTTI st 160
has obsolete equivalent: BUTTI mn 4473
broader: WETI
has lower boundary definition: Commonly intercalated with dark grey, laminated silts and clays, or sand and gravel of the Tyne and Wear Glaciolacustrine Formation. Some contacts possibly glaciotectonic.
has geographical distribution: Durham lowlands and southern Northumberland.
has lithology description: Stiff, brown, gravelly sandy clay diamicton, commonly with well dispersed clasts of andesite, tuff and granite from the Lake District; greywacke and grandiorite from southern Scotland, and red sandstones probably of both Triassic and Devonian age, in addition to Carboniferous lithologies (sandstone, gritty sandstone, limestone, mudstone, coal). Commonly thinly intercalated with dark grey, laminated silts and clays, and lenses if sand and gravel.
has thickness description: To 15m
has upper boundary definition: Generally the ground surface.

Builth Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: BUVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
is obsolete equivalent of: BUVO BUV
broader: NP
narrower: LATU
narrower: LAVO
narrower: Carneddau Volcanic Formation
narrower: NESA
narrower: CMA
narrower: Gilwern Volcanic Formation

Burnwood Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BUWC
has current status: CURRENT
has theme: BEDRCK
notation: Bn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BUWC COAL
broader: PMCM

Bushy Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BUYC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: BUYC COAL
broader: NE

Batch Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: BV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42112
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42113
has lithology component: BV MDST
has lithology component: BV SDST
has lithology component: BV TUF
has source info: BV_50177
has source info: BV_50191
has source info: BV_50414
has source info: BV_51897
has obsolete equivalent: BV mn 316
has obsolete equivalent: BV mn 315
broader: SYGP
has additional age information: Late Neoproterozoic.
has lower boundary definition: Lies within the purple sandstones and mudstones of the Synalds Formation. Base is taken at the sharp base of the "Andesitic Ash", a distinctive purple and green coarse-grained tuff bed about 130m below the top of the Synalds Formation.
has geographical distribution: Lies within eastern part of the Long Mynd, Shropshire.
has lithology description: Purplish red mudstones and thin sandstones, interbedded with four beds of distinctive purple and pale greenish grey, coarse crystal lithic ash, and lithic lapilli tuff.
has thickness description: 110m
has upper boundary definition: Taken at the top of a 2m-thick unnamed purple and pale grey tuff bed, about 21m below the top of Synalds Formation. Overlain by purple mudstones and siltstones of the Synalds Formation (undivided).

Bold Venture Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BVB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: BVB LMST
has lithology component: BVB MDST
broader: Chatburn Limestone Formation

Ballyvoy Coals
type: Concept
in scheme: NamedRockUnit
alternative label: BVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: BVC COAL
broader: NE

Bellavally Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BVF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
broader: LEG
narrower: SDM
narrower: LASM
narrower: Doobally Sandstone Member
narrower: Corry Member
narrower: LGSM
narrower: SRAD
narrower: SSHM
narrower: Drummangarvagh Member
narrower: TM
narrower: Glenkeel Member

Borrowdale Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: BVG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BVG
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42114
has lithology component: BVG AND
has lithology component: BVG ANDTFF
has lithology component: BVG ANLTUF
has lithology component: BVG BA
has lithology component: BVG BAANDT
has lithology component: BVG BATUF
has lithology component: BVG DA
has lithology component: BVG DALTUF
has lithology component: BVG PYRBRC
has lithology component: BVG RY
has lithology component: BVG RYLTUF
has lithology component: BVG VCSR
has lithology component: BVG VCSST
has source info: BVG_48926
has source info: BVG_49570
has source info: BVG_49785
has source info: BVG_50428
has source info: BVG_50725
has source info: BVG_52056
has obsolete equivalent: BVG mn 530
broader: NP
narrower: Airy's Bridge Tuff Formation
narrower: SCW
narrower: Esk Pike Sandstone Formation
narrower: Birker Fell Andesite Formation
narrower: Blengdale Tuff Formation
narrower: LAS
narrower: LBT
narrower: MRL
narrower: NEM
narrower: Dunnerdale Sandstone Formation
narrower: Deepdale Sandstone Formation
narrower: Froswick Tuff Formation
narrower: Garburn Dacite Formation
narrower: MOA
narrower: MOF
narrower: MPA
narrower: Harthwaite Tuff Formation
narrower: WAL
narrower: WB
narrower: WCF
narrower: WETS
narrower: WLT
narrower: WNB
narrower: WNY
narrower: WOU
narrower: YOT
narrower: LICK
narrower: LME
narrower: PHT
narrower: Caw Sandstone Formation
narrower: CYT
narrower: Brown Bank Tuff Formation
narrower: KMR
narrower: KNPK
narrower: HLH
narrower: HLV
narrower: SET
narrower: SGIL
narrower: SIPI
narrower: ULP

Borrowdale Sill Suite
type: Concept
in scheme: NamedRockUnit
alternative label: BVGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42115
has lithology component: BVGS AND
has lithology component: BVGS BA
has lithology component: BVGS BAANDT
has lithology component: BVGS DA
has lithology component: BVGS RY
has source info: BVGS_48986
has source info: BVGS_49549
has source info: BVGS_52663
has obsolete equivalent: BVGS mn 3866
broader: Caledonian Supersuite
has lower boundary definition: Sills within, and contemporaneous with the Borrowdale Volcanic Group, the lower boundary of which is defined at the contact of each sill. Most occur within the Borrodale Volcanic Group, though some are present in the Skiddaw Group and were previously interpreted as lava.
has geographical distribution: Within the outcrop areas of the Borrowdale Volcanic Group and Skiddaw Group, Cumbria.
has lithology description: Aphyric and porphyritic basalt, basaltic andesite, andesite, dacite and rhyolite, many with peperitic breccia margins.
has thickness description: Individual sills up to 400m thick, typically much less.
has upper boundary definition: Defined by the contact of each sill.

Bottom Victoria Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: BVIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BVIC COAL
broader: PLCM

Black Ven Marl Member
type: Concept
in scheme: NamedRockUnit
alternative label: BVM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BVM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42116
has lithology component: BVM CAMDST
has lithology component: BVM LMST
has lithology component: BVM MDST
has source info: BVM_49471
has source info: BVM_50048
has source info: BVM_50891
has source info: BVM_51796
has source info: BVM_52580
has source info: BVM_52641
has source info: BVM_52730
has obsolete equivalent: BVM mn 470
has obsolete equivalent: BVM mn 455
has obsolete equivalent: BVM mn 471
broader: Charmouth Mudstone Formation
has lower boundary definition: Base of Birchi Tabular Limestone (bed 76 of Lang, W D, et al, 1923). Conformable on Shales-with-Beef Member.
has geographical distribution: Southwest Dorset and southeast Devon, United Kingdom. Mapped on Sheets 326 (Sidmouth) and 327 (Bridport). Northern limit not yet proved.
has lithology description: Dark grey thinly interbedded mudstones and organic-rich mudstone, with a few thin beds and doggers of muddy limestone.
has thickness description: 43m
has upper boundary definition: Base of Belemnite Marl Member, at base of hummocky limestone, (Lang, W D, et al, 1922, bed 103).

Belvoir Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BVR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42117
has lithology component: BVR ASH
has lithology component: BVR DOLMST
has lithology component: BVR LMOOL
has lithology component: BVR LMST
has source info: BVR_50202
has source info: BVR_52123
broader: PKLM
has additional age information: ?Late Chadian.
has lower boundary definition: The base is inferred to be an unconformity (Riley, 1992), with the grey, buff or brown, dolomitic limestones of the Milldale Limestone Formation overlain by brown to white dolmitic, locally ooidal limestones of the Belvoir Limestone Formation.
has geographical distribution: Only proved in the subsurface at the type locality. May be present elsewhere in the subsurface on the Nottingham Shelf of the East Midlands Platform.
has lithology description: Brown to white, dolmitic, locally ooidal limestone with rare thin volcanic rock beds of 'green ash'.
has thickness description: 120m thick in the type locality.
has upper boundary definition: The top is inferred to be an unconformity (Riley, 1992), with the dolomitic, locally ooidal limestones of the Belvoir Limestone Formation overlain by a grey, pebbly sandstone present at the base of the overlying Plunger Limestone Formation.

Bovisand Formation [Obsolete Code: Use Bov]
type: Concept
in scheme: NamedRockUnit
alternative label: BVSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has obsolete equivalent: BVSB mn 544
broader: NE

Ballyvoy Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BVYS
has current status: CURRENT
has theme: BEDRCK
notation: BVYS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42118
has lithology component: BVYS COAL
has lithology component: BVYS LMST
has lithology component: BVYS MDST
has lithology component: BVYS SDST
has lithology component: BVYS SEATM
has source info: BVYS_50458
broader: Ballycastle Sandstone Group
narrower: SPCL
narrower: Carrickmore Shale Member
narrower: Hawks Nest Coal
narrower: WMC
narrower: MAL
narrower: MANC
narrower: MCYS
narrower: SRNC
narrower: Bath Lodge Coal (Ballycastle, Northern Ireland)
has lower boundary definition: Lowest coal seam (H) of Murlough Shale Formation overlying tuffaceous mudstone of Glenshesk Tuff Formation.
has lithology description: Sandstones with thin shales/siltstones, coal seams, seatearths, limestones and marine mudstones.
has thickness description: c 390m
has upper boundary definition: Present day erosion level.

Blea Wyke Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BWS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41601
has lithology component: BW SDST
has lithology component: BW SLST
has source info: BW_49471
has source info: BW_51615
has source info: BW_51707
has obsolete equivalent: BW mn 489
has obsolete equivalent: BW mn 490
has obsolete equivalent: BW mn 4404
has obsolete equivalent: BW mn 488
has obsolete equivalent: BW mn 506
broader: LI
has lower boundary definition: Gradational; rapid downward transition from pale silt and sand to darker grey mudstone of the Whitby Mudstone Formation.
has geographical distribution: Very local; Ravenscar coastal area, North Yorkshire (Cleveland Basin).
has lithology description: Micaceous, fine-grained sandstones and siltstones, grey-weathering and argillaceous in lower part, yellow-weathering and silty in upper part.
has thickness description: To c.18m
has upper boundary definition: Unconformable base of ferruginous, pebbly sandstone of the Dogger Formation (Middle Jurassic).

River Terrace Deposits, 1 (Bramley Wey)
type: Concept
in scheme: NamedRockUnit
alternative label: BW1
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BW1 GRAV
has lithology component: BW1 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

River Terrace Deposits, 2 (Bramley Wey)
type: Concept
in scheme: NamedRockUnit
alternative label: BW2
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: BW2 GRAV
has lithology component: BW2 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Brynwhilach Two-Feet Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BW2F
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: BW2F COAL
broader: SW

Bretford Sand And Gravel Member And Wasperton Sand And Gravel Member (Undifferentiated) (Warwickshire Avon)
type: Concept
in scheme: NamedRockUnit
alternative label: BWAT
has current status: CURRENT
has theme: SPRFCL
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: BWAT FLNT
has lithology component: BWAT GRAV
has lithology component: BWAT LMST
has lithology component: BWAT SANDU
broader: Warwickshire Avon Valley Formation
has lithogenesis description: River Terrace Deposits.
has lithology description: Sand and gravel, with possible lenses of silt clay or peat. [Generic description].

Boghole And Whitemire Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BWB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
broader: NE

Blisworth Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BWC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BwC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41602
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41603
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41604
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41605
has lithology component: BWC FEST
has lithology component: BWC LMST
has lithology component: BWC MDST
has lithology component: BWC SDST
has source info: BWC_49751
has source info: BWC_49752
has source info: BWC_50929
has source info: BWC_51839
has source info: BWC_52641
has source info: BWC_52850
has obsolete equivalent: BWC mn 1822
has obsolete equivalent: BWC mn 497
broader: Great Oolite Group
has additional age information: Middle Jurassic, Upper Bathonian (Retrocostatum to Discus Zone).
has lower boundary definition: Sharp but generally more or less conformable contact: limestone of the Blisworth Limestone Formation (or locally, near its northern limit, bluish and greenish grey variably shelly mudstones of the Rutland Formation) overlain by grey or variegated mudstone.
has geographical distribution: East Midlands Shelf, from just north of Milton Keynes, northwards to the Humber area where it is (probably) overstepped by the Cornbrash Formation.
has lithology description: Silicate-mudstone, grey, commonly variegated purplish red, yellow and green, poorly bedded to blocky. Commonly contains fossil rootlets and sideritic ironstone nodules, and locally with impersistant beds and lenses of argillaceous limestone including (mainly in the south) shell fragmental wackestones, packstones and grainstones, and (mainly in the north) sandstone. Mudstone weathers to highly plastic clay.
has thickness description: 0 to c.10m; typically 2 to 4m throughout most of its range.
has upper boundary definition: Sharp, generally disconformable contact: grey or variegated mudstone overlain by bioclastic limestone of the Cornbrash Formation or (very locally near its northern limit) by mudstone and sandstone of the Kellaways Formation.

Bewcastle Member
type: Concept
in scheme: NamedRockUnit
alternative label: BWCB
has current status: CURRENT
has theme: BEDRCK
notation: BEWC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41606
has lithology component: BWCB COAL
has lithology component: BWCB LMST
has lithology component: BWCB MDST
has lithology component: BWCB SDST
has lithology component: BWCB SEATS
has lithology component: BWCB SLST
has source info: BWCB_49231
has source info: BWCB_50832
has obsolete equivalent: BWCB mn 417
broader: LYNE
narrower: Ashy Cleugh Limestone
narrower: SCO
narrower: Earthwork Sandstone
narrower: Bogside Limestone
narrower: NHS
narrower: JNL
narrower: WFS
narrower: PHSA
narrower: PLL
narrower: PSS
narrower: KTBL
narrower: Hennel Cleugh Sandstone
narrower: High Grains Sandstone
narrower: HMH
narrower: RHL
has lower boundary definition: Defined at the base of the Bogside Limestone. Conformable on Lynebank Member (Bewcastle).
has geographical distribution: Northumberland - Solway Basin. Bewcastle district (England Sheet 12).
has lithology description: Cyclical sequences of sandstone, siltstone, mudstone and thin limestones, locally dolomitic (cementstones); locally thin seatearths and nodular algal beds.
has thickness description: c.180m (Bewcastle)
has upper boundary definition: Conformable upper boundary with the base of Main Algal One of the Main Algal Member (Lyne Formation) at Bewcastle.

Blidworth Coal (Nottingham)
type: Concept
in scheme: NamedRockUnit
alternative label: BWCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BWCL COAL
broader: PMCM

Baslow Coal (Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BWCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: BWCO COAL
broader: MG

Bodwrog Member
type: Concept
in scheme: NamedRockUnit
alternative label: BWG
has current status: CURRENT
has theme: BEDRCK
notation: Bwg
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OL
has predominant age: OL
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41607
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41608
has lithology component: BWG MDST
has lithology component: BWG SDST
has source info: BWG_49448
has source info: BWG_50016
has source info: BWG_50909
has obsolete equivalent: BWG mn 2410
has obsolete equivalent: BWG mn 3257
broader: Dwyfach Formation
has additional age information: Caradoc (Longvillian)
has lower boundary definition: Overlies, probably unconformably, the Allt Fawr Rhyolitic Tuff Formation, the base not being seen due to faulting.
has geographical distribution: Pwllheli and Nefyn districts, North Wales.
has lithology description: Medium- to coarse-grained sandstones and subordinate mudstones.
has thickness description: 30m
has upper boundary definition: Gradational, conformable transition into calcareous mudstones and subordinate sandstones of the Plastirion Member, (the latter is perhaps better considered as the undivided part of the Dwyfach Formation).

Barrow Hill Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BWHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: VC
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: NA

Berwick Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: BWKL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: Bowland Shale Formation

Blisworth Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BWL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BwL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41612
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41609
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41611
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41610
has lithology component: BWL CAMDST
has lithology component: BWL LMST
has lithology component: BWL MDST
has source info: BWL_49197
has source info: BWL_49198
has source info: BWL_49539
has source info: BWL_49750
has source info: BWL_49751
has source info: BWL_50341
has source info: BWL_50517
has source info: BWL_51621
has source info: BWL_51752
has source info: BWL_51932
has source info: BWL_52019
has source info: BWL_52734
has source info: BWL_52874
has obsolete equivalent: BWL mn 1824
has obsolete equivalent: BWL WLM
has obsolete equivalent: BWL mn 3904
broader: Great Oolite Group
narrower: IRCH
narrower: LONG
narrower: ROAD
has lower boundary definition: The base of the limestones overlying mudstones of the Rutland Formation.
has geographical distribution: Towcester district, Northants to Brigg, north Lincolnshire, passes south-west into the Shipton and Ardley members of the White Limestone Formation and to the north by intercalation into the marls and mudstones of the Rutland Formation.
has lithology description: Pale grey to off-white or yellowish limestones with thin marls and mudstones, fossiliferous, bioturbated peloidal, ooidal and shell-fragmental more-or-less argillaceous packstones and wackestones, subordinate cross-bedded ooidal shell-fragmental grainstones: fauna may include rhynchonellids particularly in the lower part in the south (see the Roade Member), and may be dominated by oysters, notably in the upper part in the north (see the Longthorpe Member).
has thickness description: Typically from 6 m to 7m thick in the type area, up to about 12m to the south-west, and 4m thick at Ketton.
has upper boundary definition: Generally a sharp boundary of the limestones with mudstone, or locally an erosive contact with cross-bedded shell-fragmental ooidal limestone, both of the Blisworth Clay Formation.

Birdwell Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BWR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Bowland Shale Formation (Offshore) [Redundant Code: Use Bsg]
type: Concept
in scheme: NamedRockUnit
alternative label: BWSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CN
broader: WHHU

Baronwood Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BWSG
has current status: CURRENT
has theme: SPRFCL
notation: Bw
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41613
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41614
has lithology component: BWSG CLAY
has lithology component: BWSG GRAV
has lithology component: BWSG SANDU
has lithology component: BWSG SILT
has source info: BWSG_50881
has source info: BWSG_50918
has source info: BWSG_51685
has obsolete equivalent: BWSG GFSG
has lateral equivalent: BWSG st 80
broader: ISCG
has additional age information: Late Devensian.
has lower boundary definition: Unconformable boundary with red diamicton of the Greystoke Till Formation below, or on bedrock.
has geographical distribution: The Vale of Eden and the southern Solway Lowlands north of the 'Scottish Readvance' limit.
has landform description: Deposits occur as fans, flat-topped plateaux, mounds, ridge systems and terraces.
has lithology description: Sand and gravel with clasts mainly derived from the Vale of Eden (including brown "Penrith" and red "St Bees" sandstones, Carboniferous limestone and yellow sandstones), the Lake District (including andesitic lavas and welded tuffs) and the Alston Block (sandstones and grit), but also with some granodiorite, granite and other rocks from the Galloway Hills. Deposits occur as fans, flat-topped plateaux, mounds, ridge systems and terraces. Fans and plateaux commonly include deltaic sequences that coarsen upwards from laminated silt and clay, through fine- and coarse-grained sand to cobble gravel. Ridge systems commonly includes core of cobble gravel partially overlain and surrounded by sand and gravel that fine upwards. Terraces are commonly underlain by dense gravel. All deposits include lenses of, and are locally capped by, red gravelly diamicton (flow till).
has thickness description: To 30m
has upper boundary definition: At surface or overlain unconformably by Flandrian sediments.

Beck Wood Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: BWT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BWT
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41616
has lithology component: BWT RYTUF
has source info: BWT_49785
has source info: BWT_51750
has source info: BWT_51902
has obsolete equivalent: BWT mn 1930
has obsolete equivalent: BWT mn 4160
broader: WB
has lower boundary definition: Base of rhyolitic tuff that rests on an erosion surface cut in dacitic lapilli-tuff (Waberthwaite Tuff Formation).
has geographical distribution: Outcrop in Beck Wood, 500m west of Beck Farm, near Millom, Cumbria.
has lithology description: Rhyolitic tuff - densely welded.
has thickness description: 60-90m
has upper boundary definition: Top of rhyolitic tuff - probably an erosion surface - at contact with overlying dacitic lapilli-tuff of the Waberthwaite Tuff Formation.

Blidworth And Top Hard Coal (Vale Of Belvoir)
type: Concept
in scheme: NamedRockUnit
alternative label: BWTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BWTH COAL
has lateral equivalent: BWTH st 836
broader: PMCM

Burrier Wick Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BWTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: SHETG

Bottom Wheatworth Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BWWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BWWC COAL
has lateral equivalent: BWWC st 800
broader: PMCM

Ben Wyvis Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BWYP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AP
has predominant age: AP
has youngest age: AP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41617
has lithology component: BWYP PEL
has lithology component: BWYP PSAMM
has lithology component: BWYP SEMPEL
has source info: BWYP_48861
has source info: BWYP_50851
has source info: BWYP_52150
has obsolete equivalent: BWYP mn 397
has obsolete equivalent: BWYP mn 398
broader: Glenfinnan Group
has lower boundary definition: The eastern margin of the Garve Psammite Formation, where predominantly siliceous psammitic lithologies pass into predominantly pelitic lithologies to the east.
has geographical distribution: Forms a continuous belt, extending north-east from Loch Luichart and Loch Garve, thinning towards the north-east. At the Dornoch Firth, the western extent outcrops at (NH682874), and the eastern extent is defined by the Old Red Sandstone unconformity at Struie Hill (NH678866). The north-eastern extent terminates at a faulted contact just north of the Dornoch Firth near Newrton Point (NH718890). South of Loch Luichart it has an extensive outcrop, delineated south across Strathconnon, the Orrin Reservoir and Strath Farrar as far as Struy Forest, and west to Sgurr na Fearstaig (NH228437) close to the eastern end of Loch Monar. The outcrop continues south to Glen Affric, and probably also on the southern side of Glen Affric to the south and west of Loch Beinn a' Mheadhoin, where it thins and becomes discontinuous. The outcrop probably continues further to the south and west, to Loch Cluanie and beyond.
has lithology description: Migmatic, garnetifierous, tourmaline-bearing, gneissose pelite and semipellite, containing lenticles of quartzofeldspathic segregations, and quartzofeldspathic pegmatite veins and pods.
has thickness description: At least 2 to 3 km thick (Wilson 1975).
has upper boundary definition: The western margin of the Tarvie Psammite Formation, where predominantly pelitic lithologies pass eastwards into predominantly psammitic lithologies.

Ballantrae Ophiolite Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BX
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: BX
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41618
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41619
has lithology component: BX AGG
has lithology component: BX AMPHB
has lithology component: BX BALVPW
has lithology component: BX BAVBR
has lithology component: BX CESCH
has lithology component: BX CHRT
has lithology component: BX CONG
has lithology component: BX DOLR
has lithology component: BX GB
has lithology component: BX QDI
has lithology component: BX SEPITE
has lithology component: BX TOL
has lithology component: BX VCSST
has source info: BX_48694
has source info: BX_48809
has source info: BX_48811
has source info: BX_49820
has source info: BX_49821
has source info: BX_49925
has source info: BX_49926
has source info: BX_50368
has source info: BX_50402
has source info: BX_51164
has source info: BX_51860
has source info: BX_52024
has source info: BX_52714
has lateral equivalent: BX st 66
has lateral equivalent: BX st 67
has obsolete equivalent: BX mn 221
has obsolete equivalent: BX mn 1715
has obsolete equivalent: BX mn 220
has obsolete equivalent: BX st 67
broader: NA
narrower: Byne Hill Intrusion
narrower: Balcreuchan Group
has lower boundary definition: Not seen; speculatively a thrust contact on crystalline basement.
has geographical distribution: About 75 square kilometres between Girvan and Ballantrae, Ayrshire, southwest Scotland.
has lithology description: Tectonically assembled complex consisting largely of sepentinised ultramafic rock and basaltic pillow lavas. The latter are associated with basaltic breccias and a range of volcaniclastic rocks, conglomerate, mudstone-supported melange and chert. Some of the sedimentary rocks contain a graptolite fauna. There are several generations of dolerite and gabbro intrusions, and tectonism has locally produced amphibolite and greenschist.
has thickness description: Highly speculative; at least several kilometres and possibly as much as 10km.
has upper boundary definition: Major unconformity beneath the overlying sedimentary cover. Above different parts of the Complex this cover is assigned to the Barr and/or Ardmillan groups and/or the Old Red Sandstone.

Box Law Plug
type: Concept
in scheme: NamedRockUnit
alternative label: BXLAW
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: BXLAW TR
broader: SSDPC

Blackberry Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYBA
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Ballyness Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYC
has current status: CURRENT
has theme: BEDRCK
notation: BYC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41620
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41621
has lithology component: BYC CONG
has lithology component: BYC MDST
has lithology component: BYC PESST
has lithology component: BYC SDST
has source info: BYC_50917
has source info: BYC_52798
has obsolete equivalent: BYC mn 284
has obsolete equivalent: BYC mn 2535
has obsolete equivalent: BYC mn 750
broader: TYRO
has lower boundary definition: Unconformable on a variety of rock units.
has lithology description: Bright red sandstones, quartz-pebble conglomerates and pebbly sandstones.
has thickness description: c.300m
has upper boundary definition: Rapid transition, conformable to succeeding peritidal carbonates and shales (Clogher Valley Formation)

Bytham Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: BYCA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41622
has lithology component: BYCA C
has lithology component: BYCA P
has lithology component: BYCA S
has lithology component: BYCA V
has lithology component: BYCA Z
has source info: BYCA_49112
has source info: BYCA_50257
has source info: BYCA_50446
has source info: BYCA_52215
has source info: BYCA_52456
broader: Dunwich Group
narrower: Bytham Sand And Gravel Formation
narrower: Baginton Sand And Gravel Formation
narrower: ISAG
narrower: SMSG
has additional age information: Early Pleistocene to Mid Pleistocene.
has lower boundary definition: Unconformable on bedrock of Carboniferous to Pleistocene age.
has geographical distribution: Deposits of the subgroup follow the course of the pre-Glacial Proto-Soar and Bytham rivers, from Snitterfield near Stratford-upon-Avon in the west, to Croft and Huncote, Leicester, Castle Bytham and Witham-on-the-Hill, towards the Fen edge south of Bourne, through Shouldham Thorpe, south along the eastern margin of Fens to High Lodge, Middenhall, along the valleys of the Lark, Little Ouse, and Waveney, to the North Sea coast at Pakefield and Kessingland.
has lithology description: The subgroup encompasses all the fluvial, lacustrine and organic deposits of the Proto-Soar and Bytham rivers. Deposits of four separate river terrace levels are recognised as members of the Ingham Formation. Commonly a basal sandy gravel is overlain by pebbly sands, with few clay and silt beds. The gravels of all contain a high proportion of rounded pebbles of grey and purple "Bunter" quartzite of Triassic derivation, and of vein quartz, Jurassic and Cretaceous rocks are local important constituents. Sedimentary structures indicate deposition by braided rivers.
has thickness description: c.18m
has upper boundary definition: Commonly overlain by Middle Pleistocene glacigenic deposits. Upper boundary may be difficult to determine where overlain by glaciofluvial sand and gravel, but the presence of more angular clasts, chalk, and poorer sorting in the latter is generally helpful.

Bychton Two Yard Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BYCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: BYCH COAL
broader: NE

Bottom Yard Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: BYCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BYCO COAL
broader: PMCM

Bransty Cliff Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYCS
has current status: CURRENT
has theme: BEDRCK
notation: BRCS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41623
has lithology component: BYCS MDST
has lithology component: BYCS SDST
has lithology component: BYCS SLST
has source info: BYCS_48926
has source info: BYCS_48927
has source info: BYCS_50054
has source info: BYCS_51342
has obsolete equivalent: BYCS mn 4621
broader: WS
has lower boundary definition: Unconformable on Middle Coal Measures, base of lowest major reddened channel sandstone unit.
has geographical distribution: West Cumbria Coalfield.
has lithology description: Red, cross-bedded sandstone with mudstone interbeds and thin palaeosol horizons.
has thickness description: >100m
has upper boundary definition: Top of highest major channel sandstone unit.

Barroway Drove Beds
type: Concept
in scheme: NamedRockUnit
alternative label: BYD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithogenesis: CLSH
has lithology component: BYD CLAY
has lithology component: BYD SILT
broader: NE
has lithology description: Mainly silt and clay (Older Salt Marsh and Tidal Creek Deposits). [Generic description: 1: 50 k map margins].

Braslyd Fach Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BYDF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BYDF COAL
broader: SWMCM

Ballydurnian Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYDN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: BYDN BREC
broader: NE

Braslyd Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: BYDR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: BYDR COAL
broader: SWMCM

Bressay Flagstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DU
has lithology component: BYF CAMDST
has lithology component: BYF CONG
has lithology component: BYF PESST
has lithology component: BYF SDST
has lithology component: BYF SLST
has obsolete equivalent: BYF mn 594
broader: SUMH

Blaen-Y-Glyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
broader: NE

Ballygawly Gneiss
type: Concept
in scheme: NamedRockUnit
alternative label: BYGN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M
has geographical distribution: Recignised in the Republic of Ireland.

Bucklebury Common Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41624
has lithogenesis: FLUV
has lithology component: BYGR CLAY
has lithology component: BYGR GRAV
has lithology component: BYGR SANDU
has source info: BYGR_49108
has source info: BYGR_49655
has source info: BYGR_51515
has obsolete equivalent: BYGR PLG
has obsolete equivalent: BYGR mn 666
broader: KNTV
has lower boundary definition: Erosional base on Tertiary-Cretaceous bedrock.
has geographical distribution: Kennet Basin and interfluves.
has lithology description: Gravel, variably clayey and sandy.
has thickness description: 1-5m commonly
has upper boundary definition: Terrace surface around Bucklebury.

Boyle Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYLE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: TYRO
narrower: Drumbrick Sandstone Member
narrower: RHAM
narrower: RKIT
has geographical distribution: Recignised in the Republic of Ireland.

Byley Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYM
has current status: CURRENT
has theme: BEDRCK
notation: ByM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41625
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41627
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41626
has lithology component: BYM MDST
has source info: BYM_50329
has source info: BYM_51674
has obsolete equivalent: BYM mn 2195
has obsolete equivalent: BYM mn 716
broader: SIM
has lower boundary definition: Top of Northwich Halite.
has geographical distribution: Chesire Basin.
has lithology description: Alternations of structureless reddish brown mudstone and laminated greenish grey and reddish brown mudstones. NOTE: The contact between the Byley Mudstones and overlying Wych Mudstones is not currently shown on British Geological Survey maps, and they have been mapped as one division.
has thickness description: 180.90 metres in Byley borehole (SJ 76 NW/7).
has upper boundary definition: Top of highest substantial laminated greenish grey and reddish brown bed in this formation; base of Wych Mudstones.

Bassey Mine Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: BYMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BYMC COAL
broader: PUCM

Bryn Brith Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BnB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41628
has lithology component: BYN MDST
has lithology component: BYN MFTUF
has lithology component: BYN TFASST
has lithology component: BYN TUFT
has source info: BYN_49704
has source info: BYN_51180
has source info: BYN_51886
has obsolete equivalent: BYN mn 649
has obsolete equivalent: BYN mn 648
broader: Cregennen Formation
has lower boundary definition: Conformable on the felsic ash-flow tuffs of the Offrwm Volcanic Formation or within the lowermost mudstones of the Cregennen Formation.
has geographical distribution: Cadair Idris district.
has lithology description: Massive lenticular beds of disturbed mafic tuff, tuffite and tuffaceous sandstone, with subordinate thin mudstones.
has thickness description: To 65m, and might be locally up to 150m.
has upper boundary definition: Conformable within the mudstones of the Cregennen Formation.

Byne Hill Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: BYNE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: BYNE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41629
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41630
has lithology component: BYNE DOLR
has lithology component: BYNE GB
has lithology component: BYNE QDI
has lithology component: BYNE TO
has lithology component: BYNE TOL
has source info: BYNE_49821
has source info: BYNE_52866
has obsolete equivalent: BYNE mn 717
broader: Ballantrae Ophiolite Complex
has lower boundary definition: Intrusive contact.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Leucotonalite ('trondhjemite').
has thickness description: Two similarly trending elongate bodies, each c. 1km x 0.25km
has upper boundary definition: Intrusive contact.

Brierley Rock
type: Concept
in scheme: NamedRockUnit
alternative label: BYR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: BYR SDST
broader: Brierley Member

Baggy Sandstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41631
has lithology component: BYS MDST
has lithology component: BYS SDST
has lithology component: BYS SLST
has source info: BYS_51015
has source info: BYS_51086
has source info: BYS_51484
has source info: BYS_52397
has obsolete equivalent: BYS mn 199
has obsolete equivalent: BYS mn 198
has obsolete equivalent: BYS mn 2776
has obsolete equivalent: BYS mn 197
broader: Exmoor Group
has lower boundary definition: The unit is conformable with the underlying Upcott Slates. The Baggy Sandstones sequence of grey and buff, fine- to medium-grained, thickly-bedded and massive sandstones, marked by local ferruginous staining is in sharp contact of cream, buff, green, grey and purple slates and silty slates of the underlying Upcott Slates.
has geographical distribution: Around Barnstaple in North Devon, the outcrop runs east to west between the coast and inland, near to Dulverton.
has lithology description: Interbedded brown and grey fine-grained sandstones, siltstones and greenish-grey shaly mudstones with thicker buff, fine- and medium-grained feldspathic and micaceous sugary sandstones.
has thickness description: To 450m
has upper boundary definition: Conformable with the overlying Pilton Shales, though no sharp formation boundary lines can be traced. The top of the Baggy Sanstones, characterised by thickly-bedded and medium-grained sugary sandstones with partings of thinly-bedded micaceous sandstone, passes transitionally into the Pilton Shales, seen typically as shales and siltstones with placed at the top of the highest of the fine- to medium-grained sugary sandstones of the Baggy Sandstone.

Beckley Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BeS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41632
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41633
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41635
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41634
has lithology component: BYSA LMST
has lithology component: BYSA SANDU
has lithology component: BYSA SDST
has source info: BYSA_48752
has source info: BYSA_48940
has source info: BYSA_49527
has source info: BYSA_50512
has source info: BYSA_52016
has source info: BYSA_52029
has source info: BYSA_52087
has source info: BYSA_52426
has obsolete equivalent: BYSA mn 332
has obsolete equivalent: BYSA mn 1996
has obsolete equivalent: BYSA mn 2551
has obsolete equivalent: BYSA mn 409
has obsolete equivalent: BYSA mn 2527
broader: KTON
has lower boundary definition: The lower boundary is gradational. East of Cumnor, there is an upward transition from the muddy and more finely sandy Temple Cowley Member or the spiculitic sandstone of the Arngrove Spiculite Member, into non-spiculitic sands and calcareous sandstone. West of Cumnor, there is a gradational change up from poorly fossiliferous fine-grained and sandy mudstone of the Hazelbury Bryan Formation, into medium- to coarse-grained sand and sandstone, with possibly some lateral passage.
has geographical distribution: From Beckley south-westwards through Oxford and Abingdon at least as far as Faringdon. At the north-eastern limit it is overstepped by the Stanford Formation as seen in the inset map on 1:50 000 Sheet 237.
has lithology description: A grey, weathering brown to yellow, quartzose, fine- to medium-grained Sand in the east, becoming coarser in the west, with calcareous sandstone beds and doggers, and thin, sandy, shelly bioclastic limestone beds. It is moderately fossiliferous, containing bivalves and ammonites.
has thickness description: Up to 20 m thick, measured as 11.15 m thick in the Cumnor borehole.
has upper boundary definition: East of Garford, Oxon, there is a sharp non-sequential boundary with fine- to medium-grained sand and sandstone, overlain by bioclastic limestones or grey calcareous mudstones of the Stanford Formation, commonly marked by a pebble bed. West of Garford, there is a change up from medium- to coarse-grained sand and sandstone into shelly ooidal limestone commonly with a basal pebble bed of the Highworth Limestone Member.

Bunny Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: BYSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has lithogenesis: FLUV
has lithology component: BYSG GRAV
has lithology component: BYSG SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Ballyrainey Sill
type: Concept
in scheme: NamedRockUnit
alternative label: BYSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Byestead's Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: BYSS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Bytham Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYTH
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41636
has lithogenesis: FLUV
has lithology component: BYTH C
has lithology component: BYTH P
has lithology component: BYTH S
has lithology component: BYTH V
has lithology component: BYTH Z
has source info: BYTH_49112
has source info: BYTH_50258
has source info: BYTH_52215
has source info: BYTH_52246
has source info: BYTH_52456
has obsolete equivalent: BYTH mn 722
has obsolete equivalent: BYTH mn 720
broader: Bytham Catchments Subgroup
has additional age information: Early Pleistocene to Mid Pleistocene.
has lower boundary definition: Unconformably overlies Jurassic bedrock.
has geographical distribution: The deposits occupy the valley of the pre-Glacial Bytham River from Castle Bytham east through Witham-on-the-Hill towards the Fen edge south of Bourne.
has lithology description: The formation encompasses fluvial, lacustrine and organic deposits of the Bytham River. Commonly a basal coarse-grained gravel is overlain by red fine- to medium-grained sand. The gravels are composed of Triassic grey and purple quartzite, vein quartz, Jurassic limestone and ironstone, and Carboniferous sandstone and chert. Sedimentary structures imply deposition in a braided river environment. The gravels are distringuished from the Baginton Sand and Gravel Formation to the west by their including a significant proportion of Jurassic as well as Triassic material.
has thickness description: Individual aggradations are usually 3 to 5m thick; may total 18m locally.
has upper boundary definition: Commonly overlain by Middle Pleistocene glacigenic deposits. Upper boundary may be difficult to determine where overlain by glaciofluvial sand and gravel, but the presence of more angular clasts, chalk, and poorer sorting in the latter is usually helpful.

Byth Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYTIL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41637
has lithology component: BYTIL DMTN
has source info: BYTIL_49172
has source info: BYTIL_50162
has source info: BYTIL_50290
has source info: BYTIL_50626
has source info: BYTIL_52460
has obsolete equivalent: BYTIL mn 719
has obsolete equivalent: BYTIL BYTIL
has obsolete equivalent: BYTIL mn 509
is obsolete equivalent of: BYTIL BYTIL
broader: East Grampian Glacigenic Subgroup
narrower: OHT
has additional age information: Devensian (?MIS 2).
has lower boundary definition: The lower boundary of the unit is sharp, planar, subhorizontal unconformity on gravels of the Howe of Byth Gravel Formation. To the west of the Howe of Byth quarry the Byth Till has been observed sharply unconformable on Devonian red sandstones.
has geographical distribution: Buchan, northeast Scotland. The formation is known from the vicinity of the Howe of Byth quarry on Sheet 97 (Fraserburgh), but may be regionally significant and present locally across northeast Scotland.
has lithology description: Gravelly, slightly clayey, silty sand diamicton. Interpreted as a subglacial till. Dark reddish brown, weakly calcareous, matrix supported. Clast lithologies are dominated by quartzite, psammitic metasedimentary rocks and red Devonian sandstones and shale. Clasts are typically subangular to subrounded and Devonian shale lithologies are striated. Clast fabrics indicate glacial transport from the west. Interpreted as a subglacial till.
has thickness description: To 3m
has upper boundary definition: The upper boundary of the formation is a sharp, undulatory (relief up to 1m) erosional unconformity overlain by the Auchmeddon Gravel Formation.

Ballytober Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: BYTR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Bangley Trachytic Member
type: Concept
in scheme: NamedRockUnit
alternative label: BYTRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41638
has lithology component: BYTRC AGG
has lithology component: BYTRC LPTUF
has lithology component: BYTRC QTR
has lithology component: BYTRC TR
has lithology component: BYTRC TRBA
has lithology component: BYTRC TRTUF
has lithology component: BYTRC VCCNG
has lithology component: BYTRC VCSST
has source info: BYTRC_49416
has source info: BYTRC_51962
has obsolete equivalent: BYTRC mn 242
broader: Garleton Hills Volcanic Formation
has additional age information: Early Visean.
has lower boundary definition: The base is apparently conformable on the Hailes Lava Member that consists of basaltic lavas and volcaniclastic rocks.
has geographical distribution: East Lothian, outcrop of the Garleton Hills Volcanic Formation around North Berwick, East Linton, Garleton Hills, Stenton and in the subcrop farther west in the BGS Spilmersford Borehole near Pencaitland, but absent adjacent to the Lammermuir Fault.
has lithology description: The Bangley Trachytic Member consists of purple and blue-grey trachytic lavas with both feldspar-phyric (sodic plagioclase to sanidine) porphyritic and non-porphyritic types. Individual flows are known to be over 20m thick. Quartz-trachytes are also present. Red, brown and purple trachytic tuff and lapilli tuff with agglomerate and some sedimentary volcaniclastic rocks also are interbedded in units known to be at least 8m thick.
has thickness description: 0 to 160m
has upper boundary definition: The Member is overlain by the siliciclastic sedimentary rocks of the Gullane Formation (Strathclyde Group). The contact is considered unconformable with volcaniclastic conglomerate recorded locally at the base of the overlying formation.

Bay Vein
type: Concept
in scheme: NamedRockUnit
alternative label: BYV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41639
has source info: BYV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Byley Mudstone Formation And Wych Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BYWY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has lithology component: BYWY ANHY
has lithology component: BYWY GYPST
has lithology component: BYWY HALI
has lithology component: BYWY MDST
broader: MMG

Boundary Zone Complex
type: Concept
in scheme: NamedRockUnit
alternative label: BZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BZ GNKPG
has lithology component: BZ GNSN
has lithology component: BZ GNSPL
has lithology component: BZ MLMST
has lithology component: BZ PEL
has lithology component: BZ PELGN
has lithology component: BZ PELSCH
has lithology component: BZ PEMRG
has lithology component: BZ PSAMM
has lithology component: BZ PSMGN
has lithology component: BZ QZITE
has lithology component: BZ SEMPEL
has lithology component: BZ SPELGN
has lithology component: BZ SPGNF
broader: NE
narrower: SKGN
narrower: VAGN
narrower: VIDL
narrower: Scatsta Pelitic Formation

Bryozoa Band (Ravenstonedale)
type: Concept
in scheme: NamedRockUnit
alternative label: BZB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has lithology component: BZB LMST
broader: Ashfell Limestone Formation

Boundary Zone And Yell Sound Division (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: BZYS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: BZYS PSMGN
broader: NA

Centre 1 Cone-Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: C1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: CM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Ardnamurchan Centre 1

Cumnock Twenty Three Fathom Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: C23F
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: C23F COAL
broader: LCMS

Centre 2 Inner Basic Cone-Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: C2IB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: CM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C2IB BA
has lithology component: C2IB DOLR
has lithology component: C2IB MCGB
broader: Ardnamurchan Centre 2

Centre 2 Outer Basic Cone-Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: C2OB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: CM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C2OB BA
has lithology component: C2OB DOLR
has lithology component: C2OB MCGB
broader: Ardnamurchan Centre 2

Achnaha Quartz Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3AQG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3AQG QGB
broader: Centre 3 Layered Gabbro Lopolith

Centre 3 Basic Cone-Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: C3B
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: CM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3B BA
has lithology component: C3B DOLR
has lithology component: C3B MCGB
broader: Ardnamurchan Centre 3

Faskadale Laminated Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3FLG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3FLG GBFLX
broader: Centre 3 Layered Gabbro Lopolith

Glendian Laminated Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3GLG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3GLG GBFLX
broader: Centre 3 Layered Gabbro Lopolith

Inner Layered Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3ILG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3ILG GB
broader: Centre 3 Layered Gabbro Lopolith

Centre 3 Layered Gabbro Lopolith
type: Concept
in scheme: NamedRockUnit
alternative label: C3LGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LP
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3LGB GB
has lithology component: C3LGB GBFLX
has lithology component: C3LGB QGB
broader: Ardnamurchan Centre 3
narrower: Achnaha Quartz Gabbro Zone
narrower: Faskadale Laminated Gabbro Zone
narrower: Glendian Laminated Gabbro Zone
narrower: Inner Layered Gabbro Zone
narrower: Olivine-Glomercrystic Gabbro Raft Zone
narrower: Outer Layered Gabbro Zone
narrower: Outer Quartz-Gabbro Zone
narrower: Sithean Mor Laminated Gabbro Zone
narrower: Outer Unlayered Gabbro Zone

Olivine-Glomercrystic Gabbro Raft Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3OGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Centre 3 Layered Gabbro Lopolith

Outer Layered Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3OLG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3OLG GB
broader: Centre 3 Layered Gabbro Lopolith

Outer Quartz-Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3OQG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3OQG QGB
broader: Centre 3 Layered Gabbro Lopolith

Sithean Mor Laminated Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3SML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3SML GBFLX
broader: Centre 3 Layered Gabbro Lopolith

Outer Unlayered Gabbro Zone
type: Concept
in scheme: NamedRockUnit
alternative label: C3UGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: C3UGB GB
broader: Centre 3 Layered Gabbro Lopolith

Castleford Four Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: C4FC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: C4FC COAL
has lateral equivalent: C4FC st 607
broader: PMCM

Carstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ca
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41640
has lithology component: CA SDST
has source info: CA_49566
has source info: CA_49567
has source info: CA_50148
has source info: CA_50838
has source info: CA_51143
has source info: CA_51284
has source info: CA_51523
has source info: CA_52482
has source info: CA_52632
has source info: CA_52794
has obsolete equivalent: CA mn 812
has obsolete equivalent: CA mn 813
has obsolete equivalent: CA mn 814
has obsolete equivalent: CA mn 2324
has obsolete equivalent: CA mn 3698
has obsolete equivalent: CA mn 4346
has obsolete equivalent: CA mn 2537
has obsolete equivalent: CA mn 4179
broader: NP
has lower boundary definition: The Carstone Formation, which was deposited during a phase of unconformable transgression, oversteps many different lithostratigraphical units. Its base is erosional and locally burrowed into the underlying strata. The base can be recognized by a downward change from greenish-brown, massive, cross-bedded, commonly bioturbated, oolitic, ferruginous, medium- to coarse-grained and pebbly sandstone [from south to north]: palaeozoic sequences on the London Platform [e.g. Four Ashes Borehole]; quartz sands and thin mudstone [Dersington Formation]; buff and grey, clayey ferruginous sands and quartz sands [Sandringham Sands Formation] in central Norfolk, between Leziate and West Dereham; pale and medium clays [Kimmeridge Clay Formation] in central Norfolk [Mudford-Great Ellingham]; pale-medium grey, very fine- to fine-grained, bioturbated, shelly sandstones with phosphatic nodules [Roach Formation] in Northern Norfolk; Shelly, calcareous mudstone [Sutterby Marl] in southern Lincolnshire; Ironstone [Fulletby Formation] in central Lincolnshire; Dark, glauconitic mudstones and limestones [Tealby Formation] in northern Lincolnshire; brown, shelly oolitic ironstone [Claxby Ironstone Formation]; late Jurassic mudstones [Kimmeridge Clay and Ampthill Clay formations] and coarse-grained sandstone [Elsham Sandstone Member] at the Humber Estuary; pale to medium, fine- to medium-grained sandstones and dark mudstones [Kellaways Formation] in southern Yorkshire; Upper Lias mudstones on the south side of the Market Weighton High.
has geographical distribution: The southern limit of the formation is between Duxford and Soham, Cambridgeshire , and south east of the Four Ashes Borehole, on the London High, although it is not seen in outcrop in these areas. The Carstone extends northwards through Norfolk and its best exposure is in the cliffs and foreshore at Hunstanton. North of The Wash, the Carstone Formation is present in Lincolnshire, beneath the Wolds and forming a narrow outcrop along their western margin. In northern Lincolnshire it is thin and locally absent. North of the Humber the Carstone Formation is again thin and patchy, but it has been recorded near South Cave, Goodmanham, Millington and Kirby Underdale, finally disappering on the Market Weighton High.
has lithology description: The typical lithology of the Carstone Formation is a greenish-brown [rusty when weathered], massive cross-bedded, oolitic ferruginous sandstone. The formation is medium- to coarse-grained and pebbly in part, especially at the base where it becomes a conglomerate. Pebbles comprising quartz, quartzite, pyritised sandstone, ironstone, grey siltstone and rolled ammonites. Some beds are silty and/ or contain clay wisps. Glauconite may be present in variable amounts. The Carstone Formation is burrowed in places with common Arenicolites and Skolithus.
has thickness description: Usually up to about 5m, but it reaches its maximum thickness of 18.9m, in the Hunstanton Borehole.
has upper boundary definition: In southern and central Norfolk the upper boundary is defined by a down-section transition from pale to medium grey mudstones and siltstones [Gault Formation] to greenish-brown, massive, cross-bedded, bioturbated, oolitic ferruginous sandstone. In northern Norfolk and Lincolnshire the boundary is marked by a sharp, perhaps gradational, down-section change from red, pink or cream limestones and marls [Hunstanton Chalk Formation] to greenish-brown, massive cross-bedded, bioturbated, oolitic, ferruginous sandstone.

Cardiff Group
type: Concept
in scheme: NamedRockUnit
alternative label: CAA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41641
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41642
has lithology component: CAA LMST
has lithology component: CAA MDST
has lithology component: CAA SDST
has lithology component: CAA SLST
has source info: CAA_48829
has source info: CAA_49944
has source info: CAA_52529
has source info: CAA_52882
has source info: CAA_53066
broader: NA
has lower boundary definition: Drawn at the base of the Hills Gardens Formation where beds of interbedded siltstones and sandstone conformably rest upon sandstone and siltstone of the Caecastell Formation.
has geographical distribution: The immediate area around Cardiff, South Wales.
has lithology description: Interbedded mudstones and thin siltstones with subordinate thin sandstones and bioclastic limestones.
has thickness description: 155 m approx.
has upper boundary definition: Drawn at the conformable upward passage of limestone of the Llanderyn Formation with mudstone, calcrete and sandstone of the Raglan Mudstone Formation.

Calke Abbey Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAAS
has current status: CURRENT
has theme: BEDRCK
notation: CAS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41643
has lithology component: CAAS CONG
has lithology component: CAAS MDST
has lithology component: CAAS SDST
has source info: CAAS_50020
has source info: CAAS_50021
broader: NP
has lower boundary definition: Unconformity with weathered, green mudstones of the Stockingford Shale Group, overlain by 13 m of thick basal conglomerate, commonly containing volcanic pebbles.
has geographical distribution: Not present at outcrop, but seen in the subsurface in the area of Hathern Shelf, Loughborough District [SK 32].
has lithology description: Brown to green-grey, medium to thick-bedded, medium- to coarse-grained sandstones, pebbly sandstones and conglomerates with low angle cross-bedding, with laminated to thinly bedded sequences of green or red mudstone and siltstone and thin, sharp-based and graded sandstone beds. Numerous reddened beds of poorly sorted structureless mudstone, siltstone and argillaceous sandstone with red to grey mottles along roots.
has thickness description: Measured as 70.6 m thick in the Ticknall Borehole.
has upper boundary definition: Marine flooding surface, overlain by green to grey, fine- to medium-grained sandstone with pebble-rich lenses, and shelly lags of Lingula of the Arch Farm Sandstone Formation.

Cabrach Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41644
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41645
has lithology component: CAB CONG
has lithology component: CAB SDST
has source info: CAB_49233
has obsolete equivalent: CAB mn 726
broader: Crovie Sandstone Group
has lower boundary definition: Basal conglomerate rests on gabbros of the Boganclogh Intrusion and on the Craigievor Formation of the Argyll Group, Dalradian Supergroup.
has geographical distribution: NW-SE-elongated outlier centred on Cabrach village, 6km x 1 to 2.5km.
has lithology description: Basal conglomerate overlain by grey, micaceous sandstones and beds of coarse conglomerate.
has thickness description: Unknown
has upper boundary definition: Faulted NW margin to outlier.

Craid A' Bhlair Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CABC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: CABC CONG
broader: INS

Caer Beris Member
type: Concept
in scheme: NamedRockUnit
alternative label: CABE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: LLGM

Caerau Formation And Blaen Myherin Mudstones Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CABM
has current status: CURRENT
has theme: BEDRCK
notation: CABM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Central Anglesey Shear Zone And Berw Shear Zone (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CABSZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EC
broader: NA

Calmstone Coal (Sanquhar)
type: Concept
in scheme: NamedRockUnit
alternative label: CAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CAC COAL
broader: MCMS

Carn A' Chlamain Member
type: Concept
in scheme: NamedRockUnit
alternative label: CACH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Glen Banvie Formation

Cat Cleuch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CACL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CACL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41646
has lithology component: CACL BA
has lithology component: CACL LAVA
has lithology component: CACL TRAND
has lithology component: CACL TRBA
has source info: CACL_52489
has source info: CACL_53011
broader: Bail Hill Volcanic Group
has lower boundary definition: Conformably overlying black graptolitic mudstone containing N. gracilis fauna.
has geographical distribution: Bail Hill area, 4km north west of Sanquhar, Dumfries, Scotland.
has lithology description: Autobrecciated basaltic lavas containing large euhedral pyroxenes.
has thickness description: c.150m
has upper boundary definition: Presumed conformably overlain by Peat Rig Formation and locally Kirkcolm Formation.

Camas Chil Mhalieu Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CACM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: CACM BREC
broader: NE

Castle Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: CACO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CACO COAL
broader: LCMS

Cadham Craw Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CADC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CADC COAL
broader: NE

Cadham Little Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CADL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CADL COAL
broader: NE

Cadham Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CADM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CADM COAL
broader: LSC

Cadder Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CADR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41647
has lithology component: CADR C
has lithology component: CADR DMTN
has lithology component: CADR S
has lithology component: CADR V
has lithology component: CADR Z
has source info: CADR_49147
has source info: CADR_49148
has source info: CADR_50918
has source info: CADR_51103
has source info: CADR_51617
has source info: CADR_52969
has source info: CADR_53006
has obsolete equivalent: CADR mn 728
has obsolete equivalent: CADR mn 729
has obsolete equivalent: CADR mn 730
broader: MVG
has additional age information: Early Dimlington Stadial.
has lower boundary definition: Unconformity on bedrock or on older unnamed Quaternary strata or the Baillieston Till Formation.
has geographical distribution: Central Scotland, related to ice streams sourced in the Highlands (in contrast to the Southern Uplands) during the Dimlington Stadial; currently identified in the Glasgow area.
has lithology description: The typical lithological assemblages consist of mainly framework-supported bouldery gravel and sand, and coarse- to fine-grained, locally pebbly, sand with silt. In a geotechnical sense, the deposits are usually dense to very dense. Much of the gravel is thickly bedded and trough cross-bedded in sets up to 3m thick. These interfinger with sands. The sands are trough cross-bedded, ripple-laminated and horizontally laminated.
has thickness description: From a veneer to more than 45m.
has upper boundary definition: Unconformity or glacial deformation boundary below younger Quaternary till.

Carn An Daimh Transitional Member
type: Concept
in scheme: NamedRockUnit
alternative label: CADT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41648
has lithology component: CADT PEL
has lithology component: CADT PELGP
has lithology component: CADT PSAMM
has lithology component: CADT QZITE
has lithology component: CADT SEMPEL
has source info: CADT_51786
broader: Gleann Beag Schist Formation
has lower boundary definition: Gradational boundary with the underlying Glen Taitneach Schist Member of the Gleann Beag Schist Formation located where psammite/quartzite becomes abundant.
has geographical distribution: Carn an Daimh area. [NO 136 718]
has lithology description: Interbedded quartzite and graphitic pelite with local graded bedding.
has thickness description: 70m
has upper boundary definition: Top of the interbedded quartzite/psammite and graphitic pelite succession. Base of the quartzite succession of the Creag Leacach Quartzite Formation.

Cadham Under Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CADU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CADU COAL
broader: NE

Carraun Shale Formation And Dergvone Shale Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CADV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
broader: LEG
has lithology description: See the Lithology descriptions for the component formations.

Armathwaite-Cleveland Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: CADY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CADY
has revision number: 1
has rock unit rank: DY
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41649
has lithology component: CADY BAANDT
has lithology component: CADY BAAPH
has lithology component: CADY DOLR
has source info: CADY_48956
has source info: CADY_50088
has source info: CADY_50089
has source info: CADY_50090
has source info: CADY_50091
has source info: CADY_52337
has lateral equivalent: CADY st 195
has obsolete equivalent: CADY mn 956
has obsolete equivalent: CADY mn 957
broader: MULD
has lower boundary definition: Not applicable.
has geographical distribution: The dyke is mapped from the coastal area of north-eastern England, across northern England, the Southern Uplands and Midland Valley of Scotland. It can be traced as part of a dyke swarm to the Isle of Mull.
has lithology description: Porphyritic basaltic andesite with plagioclase and pyroxene phenocrysts in a devitrified glassy groundmass. Locally it is amygdaloidal.
has thickness description: The dyke is generally 22 - 28 m. wide and 430 km. in mapped extent. [Macdonald, et al. 1988].
has upper boundary definition: Not applicable.

Caerketton Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CAE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41650
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41651
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41652
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41653
has lithology component: CAE AND
has lithology component: CAE DA
has lithology component: CAE OLBA
has lithology component: CAE RY
has lithology component: CAE TRR
has lithology component: CAE TUF
has source info: CAE_49223
has source info: CAE_49240
has source info: CAE_49427
has source info: CAE_50454
has source info: CAE_51146
has source info: CAE_51173
has source info: CAE_51565
has source info: CAE_52828
has source info: CAE_52986
has obsolete equivalent: CAE mn 738
has obsolete equivalent: CAE mn 739
broader: PDH
has lower boundary definition: Conformable: where pyroxene andesites, olivine basalts and locally basic tuff and breccia of the Allermuir Volcanic Member are overlain by rhyolitic tuff and flow banded rhyolite.
has geographical distribution: Pentland Hills.
has lithology description: Rhyolitic tuff intercalated with flow-banded rhyolite and some thin flows of pale pink, porphyritic dacite or rhyolite.
has thickness description: Up to 300m on Castlelaw Hill
has upper boundary definition: Conformable: where rhyolitic tuff and flow-banded rhyolite are overlain by Woodhouselee Volcanic Member: pale lilac or pink trachytes and andesites with phenocrysts of biotite and alkali feldspar. Boundary not always distinct; some interbedding of the two members takes place.

Cae Castell Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAEC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has lithology component: CAEC MDST
has lithology component: CAEC SDST
has lithology component: CAEC SLST
has source info: CAEC_51661
has source info: CAEC_51798
has obsolete equivalent: CAEC mn 4562
broader: NA
narrower: RHM
has lower boundary definition: Taken at the conformable base of the fine- to coarse-grained sandstones and pebbly sandstones of the Rhymney Grit Member, which sharply overlies the Pen-y-lan Mudstone.
has lithology description: Sandstones, siltstones and subordinate mudstones.
has thickness description: 70 to 80m
has upper boundary definition: Sharply and conformably overlain by the mudstones with thin sandstones and siltstones of the Cardiff Group.

Caenlochan Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CAES PEL
has lithology component: CAES PSAMM
has lithology component: CAES QZITE
has lithology component: CAES SEMPEL
has source info: CAES_49437
has source info: CAES_50001
has lateral equivalent: CAES st 683
has lateral equivalent: CAES BLUS
broader: Crinan Subgroup

Caered Flags
type: Concept
in scheme: NamedRockUnit
alternative label: CAF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
is obsolete equivalent of: CAF CRAD
broader: NE

Carn Fadryn Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CAFA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE
narrower: Bwlch Groes Porphyritic Microgranite
narrower: Carn Fadryn Quartz Microdiorite
narrower: Glynllifon Trachydacite
narrower: Garn Bach Dacite

Carway Fawr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CAFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CAFC COAL
has lateral equivalent: CAFC st 904
broader: SWMCM

Carway Fach Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CAFCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CAFCC COAL
broader: SWMCM

Carlingford Complex
type: Concept
in scheme: NamedRockUnit
alternative label: CAFD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Caburn Flints
type: Concept
in scheme: NamedRockUnit
alternative label: CAFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Cnoc An Fhithich Banded Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CnFS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41654
has lithology component: CAFS MDOLO
has lithology component: CAFS PEL
has lithology component: CAFS PSAMI
has lithology component: CAFS PSAMM
has lithology component: CAFS SEMPEL
has source info: CAFS_49952
has source info: CAFS_50001
has source info: CAFS_50024
has source info: CAFS_51142
has source info: CAFS_51365
has source info: CAFS_51386
has source info: CAFS_51764
has source info: CAFS_52396
has obsolete equivalent: CAFS mn 238
has obsolete equivalent: CAFS mn 239
has obsolete equivalent: CAFS mn 237
broader: Blair Atholl Subgroup
has lower boundary definition: Transitional, with interbanding of calcareous semipelite with thin grey limestone beds marks junction with upper limestone of Blair Atholl Dark Limestone and Dark Schist Formation.
has geographical distribution: From east side of Errochty Synform at Errochty Water [NN 7245 6480] discontinuously to near Braes of Foss [NN 7465 5590]. East of the Loch Tay Fault and north of the Killiecrankie Slide, it occurs from Allt Bhaic [NN 840 640] and on the eastern slopes of Glen Tilt [NN 886 680 - 898 713 and NN 912 714 - 942 745].
has lithology description: Banded alternation of rusty-weathering semipelite with 5 - 10cm beds of psammite in equal proportions; however 25% of upper part of formation consists of white, quartz-rich psammite alternating with dark, biotitic, graded pelite.
has thickness description: 0 - 150m in Sheet 55W; probably tectonically attenuated.
has upper boundary definition: Sharp boundary with buff limestone of Drumchastle Pale Limestone Formation at type locality; elsewhere taken at base of calc-muscovite-biotite pelite lithology transitional to Drumchastle Pale Limestone Formation.

Captain's Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: CAFY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Carrickarnan Complex Granophyres
type: Concept
in scheme: NamedRockUnit
alternative label: CAG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Cairngarroch Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CAGA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CAGA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41655
has lithology component: CAGA MCDI
has source info: CAGA_50385
broader: Galloway Granitic Suite
has lower boundary definition: Intrusive contact.
has geographical distribution: Rhins of Galloway, southwest Scotland.
has lithology description: Diorite.
has thickness description: c. 0.3 square km in total area (elongate)
has upper boundary definition: Intrusive contact.

Curragh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAGH
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41656
has lithology component: CAGH MUD
has lithology component: CAGH P
has lithology component: CAGH SV
has source info: CAGH_50596
has source info: CAGH_51128
has obsolete equivalent: CAGH mn 683
broader: IMCA
has lower boundary definition: Generally unconformably overlying glacigenic or Lateglacial sediments or bedrock.
has geographical distribution: Isle of Man (50k Sheets 36, 45, 46, 56, 57).
has lithology description: Peat dominated accumulations in lowland basins and on upland plateaux. Some mud and pebbly sand may occur in the lower parts of basinal sequences.
has thickness description: Up to 6m recorded.
has upper boundary definition: Generally the ground surface.

Cold Ash Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: CAGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Carnethy Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CAHI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41658
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41659
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41657
has lithology component: CAHI AND
has lithology component: CAHI BA
has lithology component: CAHI BAANDT
has lithology component: CAHI OLBA
has source info: CAHI_49223
has source info: CAHI_49240
has source info: CAHI_49427
has source info: CAHI_49808
has source info: CAHI_50454
has source info: CAHI_50711
has source info: CAHI_51146
has source info: CAHI_51173
has source info: CAHI_52828
has source info: CAHI_52986
has obsolete equivalent: CAHI mn 801
has obsolete equivalent: CAHI mn 802
broader: PDH
has lower boundary definition: Conformable: where pale lilac or pink trachytes and andesites of the Woodhouselee Volcanic Member are overlain by feldspar-phyric and fine-grained microporphyritic basalts and andesites.
has geographical distribution: Pentland Hills.
has lithology description: Feldspar-phyric and fine-grained microporphyritic basalts and andesites. Flows have amygdaloidal tops and bases.
has thickness description: Approximately 200m seen
has upper boundary definition: Not seen: faulted against Carboniferous strata to the east.

Castle Hill Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CAHIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: CAHIL BAOM
broader: SSDPC

Carnmenellis Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CAIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: CAIN GN
broader: NE
has lithology description: Comprises:(GA) coarse-grained granite with abundant feldspar megacrysts >15mm; (GB) coarse-grained granite with sparse feldspar megacrysts >15mm; (GC) coarse-grained granite with abundant feldspar megacrysts <15mm; (GD) variable medium- to coarse-grained granite with abundant feldspar megacrysts >15mm; (GE) medium- to coarse-grained biotite-muscovite-granite; (GH) fine- to medium-grained, variably megacrystic granite, feldspar megacrysts <10mm.

Coire An Iubhair Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAIUB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CAIUB HBSCH
has lithology component: CAIUB PEL
has lithology component: CAIUB PSMM
has lithology component: CAIUB QZITE
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M

Calmy Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CAL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41661
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41662
has lithology component: CAL LMST
has lithology component: CAL MDST
has source info: CAL_49343
has source info: CAL_50418
has source info: CAL_50887
has source info: CAL_51021
has source info: CAL_51465
has source info: CAL_51573
has obsolete equivalent: CAL mn 113
has obsolete equivalent: CAL mn 1381
has obsolete equivalent: CAL mn 1689
has obsolete equivalent: CAL mn 2124
has lateral equivalent: CAL BTLS
has obsolete equivalent: CAL mn 3623
has obsolete equivalent: CAL mn 1670
has obsolete equivalent: CAL mn 2007
broader: ULGS
has lower boundary definition: Generally seen as a change from a marine mudstone which has the Edmondia punctatella Band at its base with the Upper Hirst Coal beneath in the Clackmannan basin within the Upper Limestone Formation.
has geographical distribution: Throughout the outcrop and subcrop of the Upper Limestone Formation in the Midland Valley of Scotland.
has lithology description: A pale to dark grey, fine-grained, crinoidal, bioclastic, limestone, interpreted to be of marine origin, generally with two or more leaves separated by about 30cm partitions of mudstone, one leaf of "calmy" type being off-white, fine-grained and massive with a conchoidal fracture. The name is not geographical in origin, but instead indicates a "hard, pale grey or fawn, fine-grained, muddy limestone with a conchoidal fracture".
has thickness description: From 0.5m to 4.5m in the Airdrie, Falkirk and Glasgow districts, and 15m in shelf settings in Ayrshire.
has upper boundary definition: Commonly seen as a change to a thick marine mudstone, that passes up into deltaic arenaceous deposits within the Upper Limestone Formation.

Callan Group
type: Concept
in scheme: NamedRockUnit
alternative label: CALA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Pre-Caledonian And/Or Caledonian Sheets
type: Concept
in scheme: NamedRockUnit
alternative label: CALES
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CALES AMPQXN
has lithology component: CALES PGFQF
broader: NE

Calp Limestone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CALG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Caledonia Glacigenic Group
type: Concept
in scheme: NamedRockUnit
alternative label: CALI
has current status: CURRENT
has theme: SPRFCL
notation: CAL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41663
has lithology component: CALI CLAY
has lithology component: CALI DMTN
has lithology component: CALI GRAV
has lithology component: CALI SANDU
has lithology component: CALI SILT
has source info: CALI_49629
has source info: CALI_49636
has source info: CALI_50918
has source info: CALI_51617
has source info: CALI_52633
has obsolete equivalent: CALI mn 3038
broader: Great Britain Superficial Deposits Supergroup
narrower: East Grampian Glacigenic Subgroup
narrower: Borders Glacigenic Subgroup
narrower: LBD
narrower: Central Cumbria (Albion) Glacigenic Subgroup
narrower: Central Cumbria Glacigenic Subgroup
narrower: Central Grampian Glacigenic Subgroup
narrower: MVG
narrower: MXGL
narrower: MDR
narrower: INVG
narrower: ISCG
narrower: SUDR
narrower: WALES
narrower: WISG
narrower: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: NPEG
narrower: NSG
narrower: NWHG
narrower: SHETG
narrower: FGSL
has lower boundary definition: Sharp, unconformable contact with bedrock or units of the Albion Glacigenic Group.
has geographical distribution: The whole of Great Britain lying to the north and west of the Davensian glacial limit.
has lithology description: A suite of glacial, glaciofluvial, glaciolacustrine and glaciomarine deposits that contain clasts derived from rocks cropping out throughout northern England, Scotland and Wales, and offshore, including diamictons [till], sand, gravel, silt and clay.
has thickness description: To 120m
has upper boundary definition: At the ground surface or at unconformable contact with various units of the Britannia Catchments Group or the British Coastal Deposits Group.

Pre-Caledonian And/Or Caledonian Minor Intrusion Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CALIM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CALIM GN
has lithology component: CALIM GNFO
has lithology component: CALIM GNR
has lithology component: CALIM MFIR
has lithology component: CALIM PEG
has lithology component: CALIM VQ
broader: NE

Calhame Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CALM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Carlane Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CALN
has current status: CURRENT
has theme: BEDRCK
notation: CARL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41664
has lithology component: CALN SDST
has source info: CALN_50411
has source info: CALN_50816
has source info: CALN_52799
has obsolete equivalent: CALN mn 2651
has lateral equivalent: CALN st 844
broader: Enler Group
has lower boundary definition: Sharpe change from underlying pink sandstones [with mainly angular grains] of the Ballina Bridge Formation.
has geographical distribution: Sub-surface on northwest shore of Lough Neagh.
has lithology description: Sandstone, pale orange-pink, medium-to coarse-grained, sub-to well rounded, weakly cemented.
has thickness description: 19.8 - 28m [65 - 92 ft]
has upper boundary definition: Sharp contact with white carbonate at the base of the succeeding Magnesian Limestone Formation [Belfast Harbour Evaporite Formation].

Cairn Liath Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CALQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Callant Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CALS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CALS LMST
has source info: CALS_51867
broader: Alston Formation
has geographical distribution: Langham sheet area, with correlatives across Northern England and Southern Scotland.
has lithology description: Muddy limestone with bands of calcareous mudstone; less muddy in its upper part.
has thickness description: c.8m

Carluke Tower Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: CALT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CALT COAL
broader: LSC

Carluke Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CALU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CALU COAL
has lithology component: CALU MDST
broader: LSC
has supplementary information: The Carluke Coals include the First (Upper) Carluke Coal and the Second (Lower) Carluke Coal, overlying the Carluke Tower Coal.

Caerau Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41666
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41665
has lithology component: CAM MDST
has lithology component: CAM SDST
has source info: CAM_49836
broader: NA
narrower: Caerau Mudstones Formation (Lower Tongue)
narrower: Caerau Mudstones Formation (Upper Tongue)
has lower boundary definition: Gradational, but taken at the base of the incoming of abundant packets of turbidite mudstone interbedded with laminated hemipelagites above the Rhayader Pale Shales, a sequence dominated by interbedded turbidite mudstones and burrowed hemipelagites.
has geographical distribution: Central Wales.
has lithology description: Turbidite mudstones interbedded within packets dominated by either laminated or burrowed hemipelagites. Scattered thin turbidite sandstones.
has thickness description: Up to 410 metres.
has upper boundary definition: Either sharp junction taken at the base of the lowest thick argillaceous sandstone of the Rhuddnant Grits or gradational junction taken at the entrance of abundant thin turbidite sandstones of the Glanyrafon Formation.

Caburn Marl
type: Concept
in scheme: NamedRockUnit
alternative label: CAMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Cambriense Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CAMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CAMB MDST
has lithology component: CAMB SHMDST
has source info: CAMB_51138
has obsolete equivalent: CAMB st 713
has obsolete equivalent: CAMB st 776
has obsolete equivalent: CAMB st 837
has obsolete equivalent: CAMB st 872
has obsolete equivalent: CAMB st 921
has lateral equivalent: CAMB st 670
has lateral equivalent: CAMB st 713
has lateral equivalent: CAMB st 837
has lateral equivalent: CAMB st 887
has obsolete equivalent: CAMB st 89
has obsolete equivalent: CAMB st 670
has obsolete equivalent: CAMB st 887
has lateral equivalent: CAMB st 89
has lateral equivalent: CAMB st 265
has lateral equivalent: CAMB st 776
has lateral equivalent: CAMB st 872
has lateral equivalent: CAMB st 921
has obsolete equivalent: CAMB st 265
broader: Downend Member
broader: LLFB
broader: PMCM
broader: SWMCM

Castell March Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAMH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NFR

Caerau Mudstones Formation (Lower Tongue)
type: Concept
in scheme: NamedRockUnit
alternative label: CAML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: Caerau Mudstones Formation

Camderry Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CAMM DOLMST
has lithology component: CAMM MDST
broader: Carraun Shale Formation

Cambrian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CAMN
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
broader: NP

Campsie Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: CAMPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: DY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: CU
has youngest age: CU
has lithology component: CAMPS MCQGB
broader: Central Scotland Late Carboniferous Tholeiitic Dyke Swarm

Caerau Mudstones Formation (Upper Tongue)
type: Concept
in scheme: NamedRockUnit
alternative label: CAMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: Caerau Mudstones Formation

Cam Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAMV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41667
has lithology component: CAMV C
has lithology component: CAMV P
has lithology component: CAMV S
has lithology component: CAMV V
has lithology component: CAMV Z
has source info: CAMV_49303
has source info: CAMV_49669
has source info: CAMV_51158
has source info: CAMV_51646
broader: ONCA
has additional age information: Mid Pleistocene to Holocene.
has lower boundary definition: Unconformable on Middle Pleistocene glacial deposits and on bedrock.
has geographical distribution: Entire catchment of the River Cam and its tributaries, from near Saffron Waldon, Essex to near Ely, Cambridgeshire.
has lithology description: The formation encompasses the fluvial, lacustrine and organic deposits of the River Cam and its tributaries. Four terraces are known. The terrace deposits comprise well bedded to rather poorly bedded sands and sandy gravels, deposited by a braided river in a periglacial environment. The pebbles are dominantly rounded chalk and rounded to angular flint, with a few glacial erratics. The three higher terraces are cryoturbated. Alluvial fan deposits comprise poorly sorted flinty chalky sand and gravel, with boulders of basalt and quartzite. The floodplain alluvium comprises silts, clays and fine sands, with bodies of peat, overlying sands and gravels.
has thickness description: To c.13m
has upper boundary definition: Land surface.

Cae'r-mynach Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAMY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NP

Canaston Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CAN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Canna Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CANA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CANA CLAY
has lithology component: CANA GRAV
has source info: CANA_49243
broader: NE
has lower boundary definition: Generally overlies rockhead.
has geographical distribution: Not defined.
has lithology description: Sandy, dark greyish brown clay with gravel and cobbles.
has thickness description: 28 metres in Borehole 81/14, generally thinner but reaches maximum of 50 metres to southwest of Canna.
has upper boundary definition: Upper boundary is base of Stanton Formation.

Cannel Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CANC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CANC COAL
broader: PLCM

Cannel Seam
type: Concept
in scheme: NamedRockUnit
alternative label: CANL
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Cannel Coal (Leicestershire)
type: Concept
in scheme: NamedRockUnit
alternative label: CANN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CANN COAL
broader: NE

Cann Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CANS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CanS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41668
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41669
has lithology component: CANS SANDU
has lithology component: CANS SDST
has source info: CANS_49329
has source info: CANS_51584
has obsolete equivalent: CANS mn 1741
broader: UGS
has lower boundary definition: Sharp incoming of glauconitic sand above the dark grey sandy clay of the Gault. Base commonly marked by a spring line.
has geographical distribution: Across most of the Shaftesbury Sheet (313) and south-east part of the Wincanton Sheet (297).
has lithology description: Sand, fine-grained, glauconitic, micaceous.
has thickness description: 16 - 30m
has upper boundary definition: A well-marked feature break, presumably coinciding with incoming of cemented sandstone in the overlying Shaftesbury Sandstone.

Cambrian And Ordovician Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CAOR
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: CAOR LMST
has lithology component: CAOR SDST
broader: NA

Croisaphuill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41670
has lithology component: CAP CHRT
has lithology component: CAP DOLMST
has lithology component: CAP DOLO
has lithology component: CAP LMST
has source info: CAP_48901
has source info: CAP_49592
has source info: CAP_49989
has source info: CAP_50473
has source info: CAP_50712
has source info: CAP_51667
has source info: CAP_52035
has obsolete equivalent: CAP mn 1142
broader: Durness Group
has lower boundary definition: Conformably overlies the Balnakiel Formation.
has geographical distribution: The Durness Group forms a narrow, discontinuous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye. The Croisaphuill Formation does not occur in Assynt or Skye and appears to be limited to the more northern parts of the Durness Group's outcrop.
has lithology description: Fossiliferous mid grey and dark grey dolomitic limestones and limestones with burrow mottling and chert nodules. Fossils include brachiopods, gastropods, cephalopods and trilobites.
has thickness description: 120 - 145 m.
has upper boundary definition: Conformably overlain by the Durine Formation.

Carsphairn Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAPH
has current status: CURRENT
has theme: BEDRCK
notation: CAPH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41671
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41672
has lithology component: CAPH CONG
has source info: CAPH_49414
has source info: CAPH_52489
has obsolete equivalent: CAPH mn 811
broader: KKF
has lower boundary definition: Lens within Kirkcolm Formation.
has geographical distribution: Carsphairn area, southern Scotland.
has lithology description: Conglomerate: channel fill unit within turbidite succession.
has thickness description: 40-450m
has upper boundary definition: Lens within Kirkcolm Formation.

Campbell Park Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CAPK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CAPK MDST
broader: Gullane Formation

Castle Point Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAPO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CAPO MDST
has lithology component: CAPO SDST
has lithology component: CAPO SLST
broader: PRMU

Castle Point Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAPT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaPt
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41673
has lithology component: CAPT CALPL
has lithology component: CAPT CALSIR
has lithology component: CAPT CALSPL
has lithology component: CAPT MLMST
has lithology component: CAPT PEL
has lithology component: CAPT PELGP
has lithology component: CAPT SEMPEL
has source info: CAPT_48670
has source info: CAPT_49235
has source info: CAPT_50001
has source info: CAPT_51142
has obsolete equivalent: CAPT mn 2644
broader: Easdale Subgroup
has lower boundary definition: Rapid transition from psammite and quartzite, through thin semipelite to graphitic pelite (John Legg's Well Graphitic Schist Member).
has geographical distribution: Coast section from John Legg's Well to Sandy Pots [NJ 580 665 to 584 665]; extends southwards as far as Clovenstone [NJ 548 517], together with isolated inliers and xenoliths in Portsoy basic intrusion.
has lithology description: Pelite, locally graphitic at base (John Legg's Well Graphitic Schist Member) and in central-upper part at coast, but less graphitic with rare metalimestone bands inland, passing upward into semipelite, flaggy. Prominent staurolite at Castle Point, and locally kyanite-bearing.
has thickness description: c.300 to 400m at coast, though there is duplication by folding and thrusting. Inland as far as the south end of Fordyce Hill, only about 100m is present between a major ductile shear zone and the Portsoy basic intrusion. East of Knock Hill [near NJ 550 550] the poorly exposed pelitic rocks cannot be differentiated from those of the Portsoy Limestone Formation.
has upper boundary definition: Transition to thin banded metalimestones and calcareous semipelites (Sandy Pots Limestone Member) at base of Portsoy Limestone Formation.

Calettwr Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has obsolete equivalent: CAQ mn 754
broader: Foel Y Ddinas Mudstones Formation

Caochandye Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41674
has lithology component: CAQU QZITE
has source info: CAQU_49233
has source info: CAQU_49798
broader: Culchavie Striped Formation
has lower boundary definition: Lower limit of quartzite above striped phyllitic semipelites of the Coralea Phyllite Member.
has geographical distribution: NNE trending outcrop, up to 250m wide extending from Allt na Craoibhe - Caorainn [NJ 318 252], over Caochandye Hill [NJ 323 209] to Water of Nochty [NJ 308 159], Moray District, 1:50 000 Sheet 75E.
has lithology description: Quartzite, pebbly in parts, usually massive.
has thickness description: To 200m (based on outcrop width).
has upper boundary definition: Upper limit of quartzite, below striped and banded semipelites and psammites of the Coulins Burn Striped Member.

Cannel Rock (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CAR SDST
broader: PLCM

Caradoc Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CARA
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CARA MDST
has lithology component: CARA WACKE
broader: NP

Carboniferous Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CARB
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: CARB CONG
has lithology component: CARB MDST
has lithology component: CARB MFIR
has lithology component: CARB SDST
has lithology component: CARB SLST
broader: NP

Carhurlie Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CARC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: CARC COAL
broader: ULGS

Carse Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CARCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41675
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41676
has lithology component: CARCL C
has lithology component: CARCL S
has lithology component: CARCL V
has lithology component: CARCL Z
has source info: CARCL_49190
has source info: CARCL_49343
has source info: CARCL_50355
has source info: CARCL_51034
has source info: CARCL_52314
has obsolete equivalent: CARCL mn 810
broader: British Coastal Deposits Group
narrower: Carse Of Stirling Clay Member
narrower: Claret Clay Member
narrower: LESI
narrower: Carey Silt Member
narrower: KNSA
narrower: Carse Of Gowrie Clay Member
narrower: Grangemouth Silt Member
narrower: Gowrie Silt Member
has additional age information: Late Devensian (Loch Lomond Stadial) to Holocene.
has lower boundary definition: Unconformable on the sub-Carse Peat (Flanders Moss Peat Formation); unconformable on the Forth Clay and Errol Clay formations and older deposits including the Wilderness Till Formation and bedrock.
has geographical distribution: Lower Tay valley from northwest of Perth, Tay estuary and Firth of Tay; lower Earn valley east of Forteviot, and estuary (Carse of Gowrie); lower Eden valley east of Cupar and estuary; Montrose Basin area. Forth valley from Aberfoyle eastwards (Carse of Stirling), Forth estuary.
has lithology description: Clayey silt and clay, commonly rooty and structureless; also highly laminated with silt and very fine- to medium-, locally coarse-grained sand with pebbles up to 5mm and fragments of vivianite; grey and brownish grey, finely micaceous, dark sulphidic patches. In sand dominated successions in outer estuary situations, coarse gravel also occurs at the base of the local member. Fuller descriptions of lithology in the entries for members: the Gowrie Silt, Carse of Gowrie Clay, Carey Silt and Kingston Sand members in the Tay-Earn area and the Letham Silt, Carse of Stirling Clay, Claret Clay and Grangemouth Silt members in the Forth area.
has thickness description: Veneer to more than 27m
has upper boundary definition: Upper boundary unconformable with modern alluvium, and commonly at the surface.

Carbost Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CARCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: CARCO BREC
has lithology component: CARCO CONG
has lithology component: CARCO CSSST
has lithology component: CARCO PESST
broader: RVAL

Carewoodrig Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CARE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CARE
has revision number: 0
has rock unit rank: WT
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41677
has lithology component: CARE AGG
has lithology component: CARE MCGBPP
has lithology component: CARE MGBPMC
has lithology component: CARE PN
has lithology component: CARE PYBRB
has lithology component: CARE TR
broader: KELSO
has lower boundary definition: Intrusive.
has geographical distribution: Hawick area, southern Scotland.
has lithology description: Pyroclastic breccia or agglomerate in vent, with intrusions of trachyte, phonolite and dolerite.
has thickness description: Vent, elongate, c.1km x 2km.
has upper boundary definition: Intrusive.

Carlinden Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CARL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CARL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41678
has lithology component: CARL MDST
has lithology component: CARL SLST
has obsolete equivalent: CARL mn 790
has obsolete equivalent: CARL mn 2660
broader: RHN
has lower boundary definition: Lowest shale band above conglomerates of Corbies's Tongue Formation.
has geographical distribution: Not defined.
has lithology description: Red and purple sandy shales and siltstones with calcareous nodules in places.
has thickness description: 50 metres approximately, contacts not exposed.
has upper boundary definition: Change from siltstone to sandstone.

Carmichael Group
type: Concept
in scheme: NamedRockUnit
alternative label: CARM
has current status: CURRENT
has theme: BEDRCK
notation: CARM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41679
has lithology component: CARM CONG
has lithology component: CARM MDST
has lithology component: CARM SDST
has lithology component: CARM SLST
has source info: CARM_49017
has source info: CARM_49583
has source info: CARM_49584
has source info: CARM_49784
has obsolete equivalent: CARM mn 793
has obsolete equivalent: CARM mn 1536
has obsolete equivalent: CARM mn 2254
has obsolete equivalent: CARM mn 1405
has obsolete equivalent: CARM mn 3044
broader: NE
narrower: WGAT
narrower: Carmichael Burn Formation
narrower: MAWO
has lower boundary definition: Faulted out by the Carmichael Fault
has geographical distribution: Carmichael Inlier, Lanarkshire, Scotland
has lithology description: Within the Carmichael Inlier, comprises interbedded fine- and medium-grained red-brown to grey green sandstones, subordinate siltstones, mudstones and conglomerates containing mainly quartzite, quartz, chert and igneous pebbles; greyish olive mudstones common towards the base with thin interbeds of fossiliferous siltstone and sandstone. The base is cut out by the Carmichael Fault, but part of the Group is repeated to the south of the fault in the Eastfield Inlier
has thickness description: c.1000m
has upper boundary definition: The incoming of the predominantly greywacke pebble bearing conglomerate belonging to the Greywacke Conglomerate Formation overlying fine- and medium- grained sandstones, siltstones and mudstones forming the Carmichael Group

Carnamuck Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CARN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Carn Odhar Granite Cupolas
type: Concept
in scheme: NamedRockUnit
alternative label: CARNO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CARNO GN
broader: Argyll And Northern Highlands Granitic Suite

Carrickabrackan Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CARP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Carr Member
type: Concept
in scheme: NamedRockUnit
alternative label: CARR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Beatrice Formation

Carland Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CARS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CARS SDST
broader: TYRO

Cadh-An-Righ Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: CARSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Brora Argillaceous Formation

Carse's Vein
type: Concept
in scheme: NamedRockUnit
alternative label: CARV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41680
has source info: CARV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Castlecary Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41682
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41681
has lithology component: CAS CAMDST
has lithology component: CAS LMST
has lithology component: CAS MDST
has source info: CAS_49343
has source info: CAS_51950
has source info: CAS_52810
has obsolete equivalent: CAS mn 2358
has obsolete equivalent: CAS mn 1106
broader: ULGS
has lower boundary definition: Generally marked by a change from marine mudstone, or resting on a thin coal or seatrock belonging to the Upper Limestone Formation.
has geographical distribution: Restricted by penecontemporaneous erosion to Fife (marine roof), the Lothians (in part and with marine roof), and to the east of Glasgow in the Stirling-Clackmannan-Falkirk areas, within the outcrop and subcrop of the Upper Limestone Formation in the Midland Valley of Scotland.
has lithology description: A white or pale to dark grey, medium- to fine-grained, crinoidal, bioclastic, locally dolomitic limestone, interpreted to be of marine origin, and containing algal nodules.
has thickness description: Generally up to 5m, but may be absent due to erosion in areas such as in Strathclyde, Ayrshire and parts of the Stirling district.
has upper boundary definition: Commonly seen as an abrupt change to bituminous non-marine mudstone containing Curvirimula belonging to the Passage Formation. Marine mudstone roof in Fife, except where absent due to penecontemporaneous erosion, especially in the western Midland Valley of Scotland and in the centre of the Kincardine basin, where erosive-based sandstones form the base of the overlying Passage Formation.

Camasunary Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CASA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: SFSH

Cast Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CASB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
is obsolete equivalent of: CASB TTST
broader: ZZCH

Carrickmore Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CASG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Carraun Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CASH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: LEG
narrower: Camderry Member
narrower: Derreens Limestone Member
narrower: Doagh Limestone Member
narrower: SRGM
narrower: Ardvarney Limestone Member
narrower: TAWN

Camasunary Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CASI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: SFSH

Castle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CASL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CASL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41683
has lithology component: CASL SLST
has lithology component: CASL WACKE
has source info: CASL_48677
has source info: CASL_51242
has source info: CASL_52494
broader: PRH
has lower boundary definition: Base of lowest thick silt grade greywacke bed on sandstone grade greywacke/siltstone sequence of Patrick Burn Formation.
has geographical distribution: Muirkirk to Strathaven area, Strathclyde region, central Scotland.
has lithology description: Thick beds of very fine-grained greywacke, interbedded with grey siltstone.
has thickness description: 25m
has upper boundary definition: Base of overlying dark grey mudstone of Kip Burn Formation.

Caburn Sponge Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CASO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Castle Espie Group
type: Concept
in scheme: NamedRockUnit
alternative label: CASP
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CASP LMST
has obsolete equivalent: CASP mn 818
broader: NE

Castle Rocks Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CASR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CASR
has revision number: 0
has rock unit rank: WT
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41684
has lithology component: CASR TUF
has source info: CASR_48973
has source info: CASR_51170
has source info: CASR_52692
has source info: CASR_52709
broader: SSDLO
has lower boundary definition: Intrusive.
has geographical distribution: Dunbar area.
has lithology description: Elongate vent filled with tuff.
has thickness description: Not specifically recorded: about 100 m long by 70 m wide, NNE-SSW orientated elongate intrusion,
has upper boundary definition: Intrusive.

Cassie Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CASS
has current status: CURRENT
has theme: SPRFCL
notation: Cass
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41685
has lithology component: CASS CLAY
has lithology component: CASS DMTN
has lithology component: CASS GRAV
has source info: CASS_48667
has source info: CASS_50803
has source info: CASS_50861
has source info: CASS_50940
has source info: CASS_52812
has obsolete equivalent: CASS mn 639
broader: IAG
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Sheet NH74SE
has lithology description: Brown clay with stones: presumably a lodgement till.
has thickness description: 6.6m
has upper boundary definition: Sharp contact with overlying Drummore Gravel Formation.

Castle Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CASSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41686
has lithology component: CASSG MUD
has lithology component: CASSG P
has lithology component: CASSG S
has lithology component: CASSG V
has source info: CASSG_49167
has source info: CASSG_49710
has source info: CASSG_49711
has source info: CASSG_50287
has source info: CASSG_50288
has source info: CASSG_50289
has source info: CASSG_50918
has source info: CASSG_51227
has source info: CASSG_51374
has source info: CASSG_52055
has source info: CASSG_52137
has source info: CASSG_52253
has source info: CASSG_52788
has source info: CASSG_53004
has obsolete equivalent: CASSG mn 6
has obsolete equivalent: CASSG mn 820
has obsolete equivalent: CASSG mn 4117
has obsolete equivalent: CASSG mn 3927
broader: Bain Valley Formation
has additional age information: Middle to Upper Pleistocene (MI Stage 5e to 2).
has lower boundary definition: Unconformable, commonly channelled base, resting on Anglian Wragby Till or (locally) gravels of the Thorpe Sand and Gravel Member in the type area, and possibly locally on Upper Jurassic mudstone bedrock, if present, elsewhere.
has geographical distribution: Bain Valley; currently only separated reliably below Kirkby on Bain. Upstream extent uncertain but probably present at least as far upstream as Horncastle. (BGS sheets 103 and 115).
has lithology description: Predominantly cold-phase sand and gravels that underlie the Castle or First Terrace of the River Bain. Dominated by clasts of flint and chalk (though decalcified near ground surface) and a smaller proportion of Upper Jurassic and Lower Cretaceous lithologies plus minor exotics, notably ?Carboniferous sandstone and 'Bunter' pebbles (mostly derived from Anglian tills). Forms well-developed terrace surface typically about 1m above modern alluvial floodplain; the deposits extend beneath the latter and are incised into the adjacent Thorpe Terrace. Sections show syndepositional ice wedge casts but no epigenetic casts or cryogenic involutions. Locally includes cold-phase organic silts and peats, but channel-filling organic silts at the base (Tattershall Bed) yield a temperate flora and fauna assigned to MIS 5e. Correlates and merges with the following members of the Trent Valley Formation, Kirkstead Sand and Gravel Member (of the Proto-Trent) and broadly correlates with the combined Beeston and Holme Pierrepont Sand and Gravel Member, and Fulbeck and Scarle Sand and Gravel members (of the Proto-Trent).
has thickness description: 0 to c. 8m
has upper boundary definition: Ground surface or against alluvium.

Cast Castle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAST
has current status: CURRENT
has theme: BEDRCK
notation: CAST
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41687
has lithology component: CAST MDST
has lithology component: CAST SLST
has source info: CAST_52494
broader: PRH
has lower boundary definition: Between Kip Burn Formation and Patrick Burn Formation.
has geographical distribution: Not defined.
has lithology description: Siltstone and shale.
has thickness description: 60 metres.
has upper boundary definition: Between Kip Burn Formation and Patrick Burn Formation.

Central Anglesey Shear Zone
type: Concept
in scheme: NamedRockUnit
alternative label: CASZ
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Calcareous Tufa
type: Concept
in scheme: NamedRockUnit
alternative label: CAT
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CAT CATUFA
has lithology component: CAT TUFA
broader: TUFA
has lithology description: Inorganic or organic calcium carbonate; deposited at or near springs. [Generic description: 'TMOS' Procedures].

Catterline Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CATC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CATC
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41688
has lithology component: CATC AND
has lithology component: CATC CONG
has lithology component: CATC SDST
has lithology component: CATC VCSST
has source info: CATC_51632
has source info: CATC_51673
has source info: CATC_51954
has source info: CATC_52406
has obsolete equivalent: CATC mn 572
has obsolete equivalent: CATC mn 878
has obsolete equivalent: CATC mn 2131
broader: Arbuthnott-Garvock Group
narrower: Barras Conglomerate Member
narrower: SJKS
narrower: RBT
narrower: TWSA
has lower boundary definition: Conformable upon the eroded top of the highest lava flow of the Crawton Volcanic Formation.
has geographical distribution: From Gourdon to Stonehaven.
has lithology description: A bimodal, clast-supported conglomerate with clasts mainly of lava, but also containing psammite, quartzite, vein-quartz and feldspar porphyry in a medium-grained lithic sandstone matrix, with single flows of andesite and three sandstone members.
has thickness description: From 870 m to 1080 m thick, Carroll 1995a.
has upper boundary definition: Conformable and diachronous, north and south of the Bervie Bay Fault. The formation passes laterally westwards and northwards into the lavas of the Montrose Volcanic Formation.

Carsluith Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CATH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CATH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41689
has lithology component: CATH MCDIP
has lithology component: CATH MCGD
has source info: CATH_48960
broader: Galloway Granitic Suite
has lower boundary definition: Intrusive contact.
has geographical distribution: Creetown area of southwest Scotland.
has lithology description: Elongate microgranodiorite intrusion with porphyritic microdiorite dyke on northern margin.
has thickness description: c.0.5 square km in total area (c.3km long x 0.2km wide).
has upper boundary definition: Intrusive contact.

California Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: CATI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41690
has lithology component: CATI DMTN
has lithology component: CATI S
has source info: CATI_50764
has source info: CATI_52036
has source info: CATI_52145
has obsolete equivalent: CATI mn 1070
has obsolete equivalent: CATI mn 3095
broader: HPGL
has additional age information: Mid Pleistocene.
has lower boundary definition: The California Till Member overlies the Corton Sand Member within the Scratby and California area. The contact between the two units is gradational.
has geographical distribution: The California Till Member has been logged in cliff sections between California Gap and Scratby to the north of Great Yarmouth, and occurs as separate mappable leaves of till inland in the Great Yarmouth and North Walsham districts.
has lithology description: The California Till Member consists of a stratified matrix-supported diamicton that comprises beds of massive brown sandy diamicton, separated by beds of massive and horizontal-bedded chalky sand with sporadic augen-shaped lenses of fine silty sand. It is similar in lithology to the Corton Till Member.
has thickness description: Maximum observed thickness of 13m at California Gap.
has upper boundary definition: The upper boundary of the California Till Member is typically scoured and erosional, and is overlain by chalky outwash and till deposits of the Lowestoft Formation.

Catcraig Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CATL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has source info: CATL_51867
broader: LLGS
has geographical distribution: Eat Lothian (Catcraig, near Dunbar).

Cartlett Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CATT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Cattedown Member
type: Concept
in scheme: NamedRockUnit
alternative label: CATTE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has lithology component: CATTE LMST
broader: PYL
has additional age information: The age range quoted is deduced to cover the upper part of the recorded age range of the Plymouth Limestone Formation, and the lower limit might be slightly too low [awaiting literature check].

Caldecote Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41692
has lithology component: CAV LPTUF
has lithology component: CAV MDST
has lithology component: CAV SDST
has lithology component: CAV SLST
has source info: CAV_49390
has source info: CAV_51257
has obsolete equivalent: CAV mn 752
broader: Charnian Supergroup
has lower boundary definition: Not seen.
has geographical distribution: Extends from Nuneaton north-westwards to just south of Atherton Road (SP 3510 9266-3282 9509).
has lithology description: Grey, massive, feldspar and quartz crystal-lapilli tuff with subordinate angular to subrounded lithic blocks. Intercalations of grey to green, fine, well-laminated to massive tuffaceous mudstone, siltstone and sandstone.
has thickness description: 130m minimum thickness in general area. 20m minimum in type section.
has upper boundary definition: Unconformity surface. Overlain by Lower Cambrian beds of the Hartshill Sandstone Formation or by Triassic sandstone and breccia.

The Car Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CAVE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: CAVE AGG
has lithology component: CAVE TUF
broader: SSDLO

Carneddau Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
broader: Builth Volcanic Group

Carstone (Isle Of Wight)
type: Concept
in scheme: NamedRockUnit
alternative label: CAW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
broader: LGS

Cawdale Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CAWD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cawd
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41693
has lithology component: CAWD PYRBRC
has lithology component: CAWD TUF
has lithology component: CAWD TUFBRC
has lithology component: CAWD VCSST
has source info: CAWD_50981
has obsolete equivalent: CAWD mn 833
broader: MRL
has lower boundary definition: Taken at the abrupt change to bedded pyroclastic rocks from either silicic lapilli-tuff of the Whelter Knotts Formation or from bedded volcaniclastic sandstone within the Mardale Formation.
has geographical distribution: Between Ullswater and the Haweswater Reservoir, eastern Lake District, Cumbria.
has lithology description: A massive, coarse tuff and tuff-breccia, with localised pyroclastic breccia and pebbly volcaniclastic sandstone.
has thickness description: To 80m
has upper boundary definition: Taken at the abrupt change to bedded volcaniclastic sandstone of the main part of the Mardale Formation,

Carsey Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CAY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CAY COAL
broader: NE

Cayton Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CAYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: NE

Cornbrash Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41694
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41695
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41696
has lithology component: CB CALSST
has lithology component: CB CAMDST
has lithology component: CB LMST
has source info: CB_48758
has source info: CB_49105
has source info: CB_49890
has source info: CB_49891
has source info: CB_52511
has source info: CB_52820
has obsolete equivalent: CB mn 25
has obsolete equivalent: CB mn 1054
has obsolete equivalent: CB mn 1055
has obsolete equivalent: CB mn 1056
broader: Great Oolite Group
narrower: LCB
narrower: UCB
has additional age information: Middle Jurassic, Upper Bathonian (Discus Zone) to Lower Callovian (Herveyi Zone).
has lower boundary definition: Generally sharp, disconformable non-sequence: bioclastic limestone resting upon mudstone (and bioclastic ooidal limestones, locally) of the Forest Marble Formation (Wessex Basin and south Midlands), or mudstone of the Blisworth Clay Formation (East Midland Shelf east and north) or mudstone with minor sandstone beds of the Scalby Formation (Cleveland Basin).
has geographical distribution: Dorset coast (Weymouth area) to Yorkshire coast (Scarborough area); absent over the Market Weighton High. Extensive in onshore subcrop, though absent over the interior of the London Platform.
has lithology description: Limestone, medium- to fine-grained, predominantly bioclastic wackestone and packstone with sporadic peloids; generally and characteristically intensely bioturbated and consequently poorly bedded, although better bedded, commonly somewhat arenaceous units occur in places, particularly in the upper part. Generally bluish grey when fresh, but weathers to olive or yellowish brown. Thin argillaceous partings or interbeds of calcareous mudstone may occur.
has thickness description: 0 to c. 10.5m (Page, 1989); thickest in Wessex Basin but more generally 2 to 4m.
has upper boundary definition: Base of succeeding Kellaways Formation or Cayton Clay Formation (in the Cleveland Basin); comprising mudstone, commonly shelly at base, resting generally sharply and conformably or non-sequentially on bioclastic limestone of the Cornbrash.

Brand Group
type: Concept
in scheme: NamedRockUnit
alternative label: CBA
has current status: CURRENT
has theme: BEDRCK
notation: BrG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41697
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41698
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41699
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41700
has lithology component: CBA CONG
has lithology component: CBA MDST
has lithology component: CBA QZITE
has lithology component: CBA SLTE
has source info: CBA_49344
has source info: CBA_50504
has source info: CBA_50900
has source info: CBA_50921
has source info: CBA_50939
has source info: CBA_51387
has source info: CBA_51729
has source info: CBA_51833
has source info: CBA_52205
has source info: CBA_52376
has obsolete equivalent: CBA mn 574
broader: Charnian Supergroup
narrower: SWSL
narrower: Brand Hills Formation
has lower boundary definition: The base of the Group is unexposed, but is inferred to be unconformable upon units of Neoproterozoic III age that include intrusive rocks of the South Charnwood Diorites and tuffaceous mudstones, siltstones and sandstones of the Bradgate Formation.
has geographical distribution: Extends from Groby Lodge area, north-eastwards to outskirts of Nanpantan, along the eastern edge of Charnwood Forest.
has lithology description: The Group consists of quartz-arenites and turbiditic sandstones of the Lower Cambrian Brand Hills Formation, which in turn pass up to grey, cleaved mudrocks of the Swithland Formation.
has thickness description: 400m+
has upper boundary definition: Not seen.

Cardigan Bay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBAY
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: CBF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41702
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41701
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41703
has lithogenesis: GLACI
has lithology component: CBAY CLAY
has lithology component: CBAY DMTN
has lithology component: CBAY GRAV
has lithology component: CBAY SANDU
has source info: CBAY_48926
has source info: CBAY_49085
has source info: CBAY_50226
has source info: CBAY_52003
has source info: CBAY_52437
has source info: CBAY_52452
broader: ISCG
has additional age information: Early to Late Devensian.
has lower boundary definition: An erosion surface with a gentle topographic variation of about 15m on the underlying St George's Channel Formation. Locally on pre-Quaternary erosion surface.
has geographical distribution: Irish Sea.
has lithology description: Upper and lower tabular unstratified (till) members, laterally grading to sands and gravels, separated by an intervening lenticular and tabular infill member. The Lower Till Member comprises stiff clay, abundant pebbles, slightly pebbly sand with shell clasts, together suggestive of a sub-glacial lodgement till, and elsewhere interpreted ice-proximal glaciomarine sands. The lenticular component comprises sands with subordinate muds, whereas the associated overlying tabular beds consist of fine-grained silty sands and sandy clays. The Upper Till Member shows a stiff to hard diamicton of clay with varying sand, gravel, shell, cobbles and boulders.
has thickness description: 28 to 158m
has upper boundary definition: Unconformity at base of overlying Upper Western Irish Sea Formation. Locally crops out at sea bed.

Conksbury Bridge Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41704
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41705
has lithology component: CBB BA
has lithology component: CBB DOLR
has source info: CBB_49236
has source info: CBB_50164
has source info: CBB_50707
has obsolete equivalent: CBB mn 1036
has obsolete equivalent: CBB mn 1035
broader: Fallgate Volcanic Formation
has lower boundary definition: In the Haddon Fields Borehole basalt of the Conksbury Bridge Lava Member is underlain by pale grey and cherty limestones with some calcilutites, included within the Fallgate Volcanic Formation
has geographical distribution: Present at outcrop in the lower part of Lathkill Dale, north of Alport. Also proved in Boreholes at Alport [SK2365]. Occurs about 27m (Shirley, 1950) or 19m (Aitkenhead et al., 1985) above the Lathkill Dale Lava Member. The member is not seen west of Over Haddon [SK203 663]
has lithology description: In the Haddon Fields Borehole the member comprises three flows of compact and amygdaloidal basalt. At Conksbury Bridge the member includes two flows: the upper flow includes a vesicular basalt at the top and base and a central non-vesicular dolerite; the lower flow has a highly vesicular and slightly haematised upper margin, which grades down into a non-vesicular dolerite (Walters, et al., 1981).
has thickness description: The thickest development is 51.71m, proved in the Haddon Fields Borehole.
has upper boundary definition: At Conksbury Bridge, limestone of the Monsal Dale Limestone Formation rests upon a vesicular upper margin of a 5m thick lava flow of the Conksbury Bridge Lava Member (Walters and Ineson., 1981).

Creech Brick Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBBC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GB
has predominant age: GB
has youngest age: GB
has lithology component: CBBC CLAY
broader: Branksome Sand Formation

Carrickmore Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CBBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Chalky Till
type: Concept
in scheme: NamedRockUnit
alternative label: CBC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CBC CHLK
has lithology component: CBC DIAMIT
broader: NE
has lithology description: Pebbly clay, rich in chalk clasts, locally with lenses of sand and gravel. [Generic description].

Cornbrash Formation And Cayton Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CBCA
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
has lithology component: CBCA LMST
broader: NA

Clydebank Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41706
has lithology component: CBCL C
has lithology component: CBCL S
has lithology component: CBCL V
has lithology component: CBCL Z
has source info: CBCL_49147
has source info: CBCL_49148
has source info: CBCL_50918
has source info: CBCL_51103
has source info: CBCL_51617
has source info: CBCL_52969
broader: British Coastal Deposits Group
narrower: Erskine Clay Member
narrower: Buchanan Clay Member
narrower: LUGH
narrower: Gourock Sand Member
has lower boundary definition: The Clydebank Clay Formation rests with angular unconformity on older Quaternary sediments or bedrock. It most commonly rests on the Wilderness Till Formation (WITI) of the Caledonia Glecigenic Group (Midland Valley Glacigenic Subgroup).
has geographical distribution: The Clydebank Clay Formation is recognised in the lower Clyde Valley north of Lanark, in the estuary of the Clyde, and in Loch Lomond.
has lithology description: The Clydebank Clay Formation comprises mainly clay and silt, with subsidiart sand and gravel deposits, forming four members (q.v.): from oldest to youngest these are the Buchanan Clay, Longhaugh Sand and Gravel, Erskine Clay and Gourock Sand members. More detail of the lithologies of the individual members is included in the related Lexicon entries.
has thickness description: Ranges from a veneer to more than 15m.
has upper boundary definition: The Clydebank Clay Formation is overlain unconformably by younger Quaternary sediments, normally either the Clippens Peat Formation or Clyde Valley Formation of the Clyde Catchment Subgroup (Britannia Catchments Group). It is also extensively exposed at surface in the lower Clyde valley.

Cobble Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: CBCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CBCO COAL
broader: PLCM

Cock Burn Calcareous Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41707
has lithology component: CBCS CALSIR
has lithology component: CBCS LMST
has lithology component: CBCS PSAMM
has lithology component: CBCS SEMPEL
has source info: CBCS_49233
broader: Ballachulish Subgroup
has lower boundary definition: At upper limit of quartzite of Corryhabbie Quartzite Formation.
has geographical distribution: Confined to inverted 'tea-cup' shaped outcrop south of Allargue and Corgarff on Upper Donside, cut by Cock Burn and River Don. To south, cut out by Glen Gairn Granite.
has lithology description: Calcareous semipelites and micaceous psammites, grey-green, phyllitic to schistose. Abundant laminated and striped calc-silicate and limestone bands.
has thickness description: c. 300m.
has upper boundary definition: At passage from calcareous semipelite and psammite into graphitic pelite of the Allarghe Graphitic Schist Member.

Cobden Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CBD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: Hebden Formation

Coalburn Dross Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CBDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBDC COAL
broader: LSC

Cressbrook Dale Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBDL
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41708
has lithology component: CBDL BA
has lithology component: CBDL TUF
has source info: CBDL_49236
has source info: CBDL_50164
has source info: CBDL_50361
has source info: CBDL_52767
has obsolete equivalent: CBDL mn 1129
broader: MO
has lower boundary definition: At the type locality, the basalt at the base of the member is underlain by dark grey cherty limestones of the Monsal Dale Limestone Formation.
has geographical distribution: The member has a limited poorly exposed outcrop at Cressbrook Dale (SK17 74), with a thicker and extensive development in the subsurface to the north and east of this locality.
has lithology description: Typically comprises hyaloclastite, basalt and tuff, the latter locally with some limestone grains. At Cressbrook Dale the member is dominated by amygdaloidal basalt. At the type locality the lower part comprises brecciated lavas, with oxidised angular fragments of vesicular or non- vesicular basalt and a matrix of silica and chlorite, interdigitated with non-brecciated basalt lavas. At this locality, the top of the member is a 0.75m thick pale green, pyritic tuff
has thickness description: Maximum thickness of 80.88m proved in the Longstone Edge Borehole, SK27SW/5 [SK 2088 7335).
has upper boundary definition: At the type locality, the pale green tuff at the top of the member is overlain by dark grey biomicrosparite limestones of the Monsal Dale Limestone Formation

C-Bed Evaporite
type: Concept
in scheme: NamedRockUnit
alternative label: CBE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: CBE GYPST
has obsolete equivalent: CBE mn 3293
broader: Eden Shales Formation

Coalburn Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CBEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBEC COAL
broader: LSC

Col-Bhein Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Cotes Bottom Flint
type: Concept
in scheme: NamedRockUnit
alternative label: CBFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Crossbrae Farm Peat Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CBFMP
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41709
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41710
has lithology component: CBFMP PS
has lithology component: CBFMP S
has source info: CBFMP_49716
has source info: CBFMP_49717
has source info: CBFMP_49806
has source info: CBFMP_50162
has source info: CBFMP_50292
has source info: CBFMP_50626
has source info: CBFMP_50897
has source info: CBFMP_52951
has obsolete equivalent: CBFMP mn 1156
has obsolete equivalent: CBFMP mn 1158
has obsolete equivalent: CBFMP CBFMP
has obsolete equivalent: CBFMP mn 1157
is obsolete equivalent of: CBFMP CBFMP
broader: Crossbrae Till Formation
has additional age information: Devensian (?MIS 5a or 5c).
has lower boundary definition: Overlies Devonian red brown sandstone bedrock in sharp unconformity, and is inferred to overlie the Crossbrae Till Formation.
has geographical distribution: Buchan, northeast Scotland. The bed is known only from the vicinity of Crossbrae Farm, Turrif on Sheet 86E (Turrif).
has lithology description: Peat, black and dark brown, variably sandy, with laminae and thin beds of variably organic silty grey medium sands and quartzose medium to coarse sand. The most recent C14 dates indicate age of the bed is >61,900 years BP (SRR-5707). Interpreted as have formed under cold interstadial climate conditions in dwarf shrub tundra (combined evidence from pollen, plant macrofossils and coleoptera).
has thickness description: To 0.55m
has upper boundary definition: A sharp unconformity with unnamed sand and gravel unit, which is in turn overlain by bedded diamicton of the Crossbrae Gelifluctate Bed. Elsewhere it is inferred that the peat bed was directly overlain by the Crossbrae Gelifluctate Bed.

Cambridge Greensand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBG
has current status: CURRENT
has theme: BEDRCK
notation: CGS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41711
has lithology component: CBG CAMDST
has lithology component: CBG GLMDST
has lithology component: CBG PHOST
has source info: CBG_48709
has source info: CBG_49273
has source info: CBG_49830
has source info: CBG_49831
has source info: CBG_51379
has source info: CBG_51898
has source info: CBG_52121
has source info: CBG_52179
has source info: CBG_52210
has source info: CBG_52281
has obsolete equivalent: CBG mn 917
has obsolete equivalent: CBG mn 1041
has obsolete equivalent: CBG mn 1743
has obsolete equivalent: CBG mn 3306
has obsolete equivalent: CBG mn 764
has obsolete equivalent: CBG mn 3064
broader: WMCH
has additional age information: Most of the unit is Cenomanian in age- Mantelliceras mantelli Zone, Neostlingoceras carcitanense Subzone. However, where a more complete succession is preserved, the base may be uppermost Albian (C. bemerodensis ostracod zone, equating to the M. perinflatum Subzone of the S dispar Zone) (Wilkinson, 1988).
has lower boundary definition: Disconformity. Sharp contact; commonly burrowed on underlying grey Gault clay; glauconitic burrow infillings to 0.3 below junction.
has geographical distribution: Known from the north Hertfordshire and Cambridgeshire area within the Transitional Province.
has lithology description: Glauconitic marl: Thin but distinctive condensed basement bed of pale greenish grey marl rich in phosphatic nodules (so called "coprolites") at base. Much dark green glauconite as sand-sized grains, disseminated or concentrated in pods and layers giving a sandy texture and hence name "greensand". Rare erratic pebbles at base. (Hawkes, 1943).
has thickness description: Typically 0.1 - 1.0m thick. Locally thicker developments infilling hollows on top of Gault. 0.5 - 0.7m at Arlesey Brickpit (TL 188 347). (Hopson, 1992).
has upper boundary definition: Rapid upward transition to "Chalk Marl" or Lower Chalk lacking distinctive glauconite grains and nodule concentrations.

Crossbrae Gelifluctate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CBGEL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41712
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41713
has lithology component: CBGEL DMTN
has lithology component: CBGEL S
has source info: CBGEL_49716
has source info: CBGEL_49717
has source info: CBGEL_49806
has source info: CBGEL_50162
has source info: CBGEL_50292
has source info: CBGEL_50626
has source info: CBGEL_50897
has source info: CBGEL_52951
has obsolete equivalent: CBGEL CBGEL
has obsolete equivalent: CBGEL mn 1155
has obsolete equivalent: CBGEL mn 1154
is obsolete equivalent of: CBGEL CBGEL
broader: Crossbrae Till Formation
has additional age information: Devensian (?MIS 2).
has lower boundary definition: The lower boundary of the bed abruptly overlies dark brown diamicton of the Crossbrae Till Formation with a sharp, planar unconformity. Locally the basal boundary of the unit has also been observed to overlie abruptly an unnamed sand and gravel unit, which itself directly overlies the Crossbrae Farm Peat Bed.
has geographical distribution: Buchan, northeast Scotland. The bed is only known from the vicinity of Crossbrae Farm, Turriff on Sheet 86E (Turriff).
has lithology description: Gravelly, slightly clayey, silty sand diamicton. Variably coloured, dark brown to dark grey. Crudely medium-bedded, matrix supported, weakly to non-calcareous. Clasts are typically subangular to subrounded (with pelitic metasedimentary rocks commonly striated). Clast lithologies are dominated by quartzose and psammitic, and pelitic/semipelitic metasedimentary rocks, with less common red brown sandstone, felsite, grey granite, and mafic igneous rocks. Clast fabric orientations are typically normal to the present day ground topographic contours. The crude bedding of the diamicton is picked out by laminae of silty medium sand. Interpreted as periglacial gelifluctate deposits.
has thickness description: Up to 2.5m observed
has upper boundary definition: The upper boundary of the bed is the present ground surface.

Conisbrough Group
type: Concept
in scheme: NamedRockUnit
alternative label: CBGP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: NE

Cloberhill Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CBHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: LSC

Corbyn's Head Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
broader: TOBR

Hanging Rocks Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBHR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CBHR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41714
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41715
has lithology component: CBHR CONG
has lithology component: CBHR MDST
has lithology component: CBHR SDST
has lithology component: CBHR TFAMST
has lithology component: CBHR TFSLST
has lithology component: CBHR TUF
has source info: CBHR_50065
has source info: CBHR_51080
has source info: CBHR_52018
has obsolete equivalent: CBHR mn 1914
broader: Charnian Supergroup
has lower boundary definition: No longer seen, formerly stated to sharply overlie "coarse green hornstones" that are now referred to the Bradgate Formation.
has geographical distribution: Restricted to Charnwood Forest, the most definite occurrences are between Bradgate Park and Charnwood Forest Golf Course.
has lithology description: Grades from a basal facies of poorly sorted, grey, small-pebble conglomerates interbedded with coarse-grained sandstones, to graded sandstones and thin conglomerates, with grey tuffaceous mudstones and siltstones above.
has thickness description: Variable, 0 to 47m
has upper boundary definition: Not seen. The unit fines upwards, towards the base of the overlying Swithland Formation, but an unconformity is suspected since the latter is now regarded as of Early Cambrian age.

Corrie Burn Horneblende Schist
type: Concept
in scheme: NamedRockUnit
alternative label: CBHS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
notation: CBHS
has revision number: 0
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41716
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41717
has lithology component: CBHS AMPHB
has lithology component: CBHS HBSCH
has lithology component: CBHS SCH
broader: Highland Border Complex
has lower boundary definition: Not seen; faulted contact with Bolfrishlie Slate Formation.
has lithology description: Amphibolite, fine-grained, strongly schistose with a dark to pale green banded appearance on the centimetre scale, with striped chlorite albite schists at structural top.
has thickness description: Maximum 150m (estimated), possibly tectonic.
has upper boundary definition: Tectonic contact (faulted) with Lime Hill Serpentinite.

Craigmark Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CBI CBFEST
has lithology component: CBI FEST
broader: MCMS

Clayband Ironstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBIF
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41718
has lithology component: CBIF COAL
has lithology component: CBIF FEST
has lithology component: CBIF MDST
has lithology component: CBIF SDST
has lithology component: CBIF SEATM
has lithology component: CBIF SLST
has source info: CBIF_51259
has source info: CBIF_52516
has obsolete equivalent: CBIF mn 942
has obsolete equivalent: CBIF mn 943
broader: PUCM
has lower boundary definition: Top of the dark grey fissile mudstone with marine fossils of the Cambriense Marine Band.
has geographical distribution: North Staffordshire Coalfield, although not actually shown on the map.
has lithology description: Grey mudstones and siltstones with thick seatearths, numerous ironstones and coals and brittle dark grey mudstones rich in fish debris. Channel sandstones are locally important.
has thickness description: Up to 161 m in Parkhouse Colliery.
has upper boundary definition: Base of the Cannel Row Coal.

Carn Brea Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CBIN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: CBIN GN
broader: NE
has lithology description: Coarse-grained granite with abundant feldspar megacrysts >15mm.

Cambir Dolerite Sheet-Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: CBIRD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: HM
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: CBIRD MCOLGB
broader: STKI

Blackbrook Group
type: Concept
in scheme: NamedRockUnit
alternative label: CBK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CBK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41719
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41720
has lithology component: CBK LAVA
has lithology component: CBK VCBR
has lithology component: CBK VCMST
has lithology component: CBK VCSLST
has lithology component: CBK VCSST
has source info: CBK_49345
has source info: CBK_49923
has source info: CBK_50900
has source info: CBK_50921
has source info: CBK_50950
has source info: CBK_51833
has source info: CBK_52303
has source info: CBK_52376
has obsolete equivalent: CBK mn 473
has obsolete equivalent: CBK mn 474
has obsolete equivalent: CBK mn 475
broader: Charnian Supergroup
narrower: MLV
narrower: IVH
narrower: Blackbrook Reservoir Formation
has lower boundary definition: Not seen or proved in Charnwood region.
has geographical distribution: Extends from the small inlier east of Grace Dieu Brook (SK 4397 1880) south-east to Ives Head and Benscliffe Wood.
has lithology description: Well-bedded to laminated, grey to green volcaniclastic mudstones, siltstones, sandstones with volcaniclastic breccias and dacite lavas, the latter confined to the concealed Morley Lane Volcanic Formation.
has thickness description: 1750m+
has upper boundary definition: Overlain by grey, coarse-grained tuffs, lapilli tuffs and breccias of Benscliffe Breccia Member, Beacon Hill Formation, or by similarly coarse-grained lithologies of Charnwood Lodge Volcanic Formation, to the west.

Chercombe Bridge Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DV
has lithology component: CBL LMST
broader: NA
has additional age information: Late Eifelian to Givetian.

Claygate Member And London Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CBLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GY
has predominant age: GY
has youngest age: GY
has lithology component: CBLC CLAY
has lithology component: CBLC MDST
has lithology component: CBLC SANDU
has lithology component: CBLC SDST
has lithology component: CBLC SILT
broader: NE
has lithology description: See the Lithology descriptions for the component units.

Cairnbulg Diorite
type: Concept
in scheme: NamedRockUnit
alternative label: CBLG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: CBLG DI
broader: NEBAS

Cawledge Bend Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CBLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CBLM LMST
broader: Alston Formation
has geographical distribution: In the Alnwick district of Northumberland.
has thickness description: c.3m

Captain's Bridge Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CBLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has source info: CBLS_51867
has lateral equivalent: CBLS HUR
broader: LLGS
has geographical distribution: South Ayrshire; the area around Captain's Bridge.
has lithology description: Crinoid-rich limestone.
has thickness description: c.9m

Caswell Bay Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41721
has lithology component: CBM CLMST
has lithology component: CBM DLMDST
has lithology component: CBM MDST
has source info: CBM_48717
has source info: CBM_50342
has source info: CBM_51336
has source info: CBM_52830
broader: PEMB
has additional age information: ?Arundian.
has lower boundary definition: The base of the formation is taken at the sharp erosional contact between the mudstone/clay palaeosol at the top of the Gully Oolite Formation and the overlying thinly bedded calcite mudstones and mudstones of the formation. A conglomeratic lag is locally present at the base of the Caswell Bay Mudstone Formation.
has geographical distribution: The Gower [SS 50 90], Vale of Glamorgan [ST 00 74], southeast crop of the South Wales Coalfield [ST 17 85] and Weston-super-Mare [ST 32 60] areas. Present in Pembroke [SM 97 03] and Tenby [SN 13 01] areas but not currently mapped. Passes northwards into the Llanelly Formation in Wales and Clifton Down Mudstone in the Bristol area [ST 60 73].
has lithology description: Thinly interbedded grey and green grey peloidal and bioclastic micrites, wackestones and packstones, and cryptalgal laminites. Dolomitisation is locally common; on the southeast and east crop of the South Wales Coalfield and in the Chepstow area, the formation is predominantly dolomitised.
has thickness description: 15m on the south crop of the South Wales Coalfield, thinning southwards to a feather edge in the central Vale of Glamorgan, southwest Gower and southwest Pembrokeshire.
has upper boundary definition: The top of the formation is taken at the sharp erosional contact between the thinly bedded calcite mudstones and mudstones of the formation and the overlying coarse peloidal and skeletal packstones/grainstones forming the lower part of the overlying High Tor Limestone Formation.

Carreg Bica Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBMD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CBMD MDST
broader: Dinas Island Formation

Caban Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cbn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41722
has lithology component: CBN CONG
has lithology component: CBN SDST
has source info: CBN_51283
has obsolete equivalent: CBN mn 725
has obsolete equivalent: CBN mn 1333
has obsolete equivalent: CBN mn 724
broader: NA
narrower: Caban Conglomerate Formation: Caban Conglomerate Facies
narrower: Caban Conglomerate Formation (Lower Conglomerate Of Lapworth)
narrower: Caban Conglomerate Formation: First Sequence Of Caban Conglomerate Facies
narrower: Caban Conglomerate Formation (Upper Conglomerate Of Lapworth)
narrower: Gafallt Shales Facies (Caban Conglomerate Formation)
narrower: Cerrig Gwynion Grits Facies (Caban Conglomerate Formation)
narrower: SED
narrower: Dyffryn Flags Facies (Caban Conglomerate Formation)
has lower boundary definition: Not defined.
has geographical distribution: Central Wales.
has lithology description: Massive to thick-bedded conglomerates with subordinate beds of pebbly coarse sandstone.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Coalburn Nine Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CBNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBNC COAL
broader: LSC

Caban Conglomerate Formation: Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNCF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation
narrower: Caban Conglomerate Formation: Second Sequence Of Caban Conglomerate Facies
narrower: Caban Conglomerate Formation: Third Sequence Of Caban Conglomerate Facies
narrower: Caban Conglomerate Formation: Fourth Sequence Of Caban Conglomerate Facies
narrower: Caban Conglomerate Formation: Fifth Sequence Of Caban Conglomerate Facies

Caban Conglomerate Formation (Lower Conglomerate Of Lapworth)
type: Concept
in scheme: NamedRockUnit
alternative label: CBNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation

Caban Conglomerate Formation: First Sequence Of Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNS1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation

Caban Conglomerate Formation: Second Sequence Of Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNS2
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation: Caban Conglomerate Facies

Caban Conglomerate Formation: Third Sequence Of Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNS3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation: Caban Conglomerate Facies

Caban Conglomerate Formation: Fourth Sequence Of Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNS4
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation: Caban Conglomerate Facies

Caban Conglomerate Formation: Fifth Sequence Of Caban Conglomerate Facies
type: Concept
in scheme: NamedRockUnit
alternative label: CBNS5
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation: Caban Conglomerate Facies

Caban Conglomerate Formation (Upper Conglomerate Of Lapworth)
type: Concept
in scheme: NamedRockUnit
alternative label: CBNU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Caban Conglomerate Formation

Caswell Bay Oolite Formation And Caswell Bay Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CBOM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has lithology component: CBOM LMST
broader: NE

Cockermouth Breccia-Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: CBR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: NE

Coalbrookdale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBRD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cbrd
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41726
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41727
has lithology component: CBRD AND
has lithology component: CBRD MDST
has lithology component: CBRD PYRR
has lithology component: CBRD SLMDST
has lithology component: CBRD SLST
has lithology component: CBRD TUF
has source info: CBRD_48740
has source info: CBRD_51185
has source info: CBRD_51375
has source info: CBRD_53047
has obsolete equivalent: CBRD mn 4566
broader: NP
has lower boundary definition: Transitional through 3m to 9m with the underlying Buildwas Formation in type area; similar transition with the underlying Woolhope Limestone in the Woolhope-Malverns area; base placed immediately above the highest nodular horizon of the Buildwas Formation or Woolhope Limestone.
has geographical distribution: Welsh Borderland and South Wales.
has lithology description: Compact, well-bedded, olive grey to dark blue-grey silty mudstones with some calcareous siltstones, nodular calcareous beds and bentonites.
has thickness description: 192 - 265m in type area (excluding 10m of Farley Member).
has upper boundary definition: Transitional, but in practice placed at base of lowest, regularly bedded limestone of the Much Wenlock Limestone.

Crowberry Ridge Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: CBRT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Etive Rhyolite Member

Canty Bay Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CBS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: SYG
has geographical distribution: The type locality is at Canty Bay, near North Berwick, East Lothian. The sandstone appears to be a local development around this area.
has lithology description: White false-bedded sandstone containing pellets of red micaceous sandstone.

Swithland Camp Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBSC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CBSC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41728
has lithology component: CBSC CONG
has lithology component: CBSC SLST
has source info: CBSC_49507
has source info: CBSC_52376
has obsolete equivalent: CBSC mn 4090
broader: SWSL
has lower boundary definition: Sharp, erosive base on underlying grey tuffaceous siltstones of the Broadgate Formation.
has geographical distribution: Confined to the type section; not observed or not exposed elsewhere.
has lithology description: Siltstones, purple-grey, with subangular to well rounded igneous pebbles and siltstone intraclasts.
has thickness description: 0 - 5 m
has upper boundary definition: Not seen, probable conformable passage into overlying beds of the Stable Pit Member.

Coalburn Smithy And Dross Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CBSD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBSD COAL
broader: LSC

Stable Pit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CBSP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41729
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41730
has lithology component: CBSP MDST
has lithology component: CBSP SDST
has lithology component: CBSP SLST
has lithology component: CBSP WACKE
has source info: CBSP_51833
has source info: CBSP_52162
has source info: CBSP_52376
has obsolete equivalent: CBSP mn 3981
broader: Brand Hills Formation
has lower boundary definition: Unexposed, but possibly a rapid transition from conglomeratic beds of the underlying Swithland Camp Member into fine-grained sandstones and siltstones at the base of the Stable Pit Member.
has geographical distribution: Outcrops discontinuously between Stable Pit and the Brand Hills.
has lithology description: Locally variable, ranging from pale grey, medium-grained, cross-bedded quartz arenite to dark maroon-grey, parallel-bedded, massive to graded graywacke sandstone.
has thickness description: 0 - 30 m.
has upper boundary definition: Unexposed, but probably an upwards fining transition to grey, slaty mudrocks of the overlying Swithland Formation.

Coulins Burn Striped Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41731
has lithology component: CBST PSAMM
has lithology component: CBST SEMPEL
has source info: CBST_49233
has source info: CBST_49798
broader: Culchavie Striped Formation
has lower boundary definition: Upper limit of quartzites of underlying Caochandye Quartzite Member.
has geographical distribution: N-S-trending outcrop, 500-1500m wide, extending from Allt na Craoibhe-Caorainn [NJ 320 256] to Tolduquhill area [NJ 30 15], Glen Nochty, Moray District. 1:50 000 Sheet 75E.
has lithology description: Semipelite and psammite, notably striped and banded.
has thickness description: Probably c. 400m (based on outcrop width and making no allowance for probable tight folding).
has upper boundary definition: Lower limit of graphitic pelites of overlying Glenbuchat Graphitic Schist Formation.

Coalburn Six Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CBSX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBSX COAL
broader: LSC

Coalburn Smithy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CBSY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CBSY COAL
broader: LSC

Corbie's Tongue Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CBT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41732
has lithology component: CBT CONG
has source info: CBT_49248
broader: RHN
has lower boundary definition: Unconformity on Dalradian metasediments and Caledonian plutonic rocks.
has geographical distribution: Not defined.
has lithology description: Conglomerate, with rounded quartzite cobbles, reddened on the outside, set in a silty, or in places calcareous, matrix.
has thickness description: Approx. 10 metres in type section, probably increasing southwards to 15 - 20 metres on Glaschul Hill (NJ 458 149).
has upper boundary definition: Transition from conglomerate to shale.

Crossbrae Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CBTIL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41734
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41733
has lithology component: CBTIL DMTN
has source info: CBTIL_49716
has source info: CBTIL_49717
has source info: CBTIL_49806
has source info: CBTIL_50162
has source info: CBTIL_50292
has source info: CBTIL_50626
has source info: CBTIL_50897
has source info: CBTIL_52951
has obsolete equivalent: CBTIL mn 2566
has obsolete equivalent: CBTIL CBTIL
has obsolete equivalent: CBTIL mn 4207
is obsolete equivalent of: CBTIL CBTIL
broader: East Grampian (Albion) Glacigenic Subgroup
narrower: Crossbrae Farm Peat Bed
narrower: Crossbrae Gelifluctate Bed
has additional age information: Wolstonian (?MIS 6).
has lower boundary definition: A sharp, planar, unconformity on Devonian red-brown pebbly sandstones.
has geographical distribution: Buchan, northeast Scotland. The formation is curently only known from the vicinity of Crossbrae Farm, Turriff on Sheet 86E (Turriff). The unit may be regionally significant and present locally across northeast Scotland.
has lithology description: Dominantly brown/dark brown, very stiff, weakly calcareous, matrix supported, gravelly slightly clayey silty sand diamicton. Clast lithologies are dominated by quartzite/psammite and red brown Devonian sandstones, with less common pelitic/semipelitic metasediments, felsite, grey granite and mafic igneous rocks. Clasts are typically subangular - subrounded (with the pelitic metasedimentary rocks commonly striated). Clast fabrics indicate glacial transport from the northwest. Interpreted as a subglacial till.
has thickness description: Up to 0.7m observed
has upper boundary definition: A sharp, planar, subhorizontal surface overlain by periglacial diamictons of the Crossbrae Gelifluctate Bed. The Crossbrae Till Formation is believed to be locally overlain by the Crossbrae Farm Peat Bed.

Chapelton Burn Member
type: Concept
in scheme: NamedRockUnit
alternative label: CBUR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41735
has lithology component: CBUR MDST
has lithology component: CBUR SDST
has lithology component: CBUR SLST
has source info: CBUR_49532
has source info: CBUR_51406
broader: SWAS
has lower boundary definition: Not seen due to lack of exposure. The lower boundary occurs south of Chapelton Farm at approximately NS 2240 0434, between small stream exposures of the Chapelton Burn Member to the east, and small stream exposures characteristic of the Swanshaw Sandstone Formation to the west. The lower boundary is probably conformable, as red sandstones typical of the Swanshaw Sandstone Formation are exposed a few tens of metres to the east of the Chapelton Burn Member, and also because there is not much variation in dip between the two rock types.
has geographical distribution: The main outcrop is in Chapelton Burn, between Littleton and Glenhead farms, where the strata dip westwards. Extensions to the north and south cannot be defined, therefore it has been mapped as a discontinous lens of floodplain facies, surrounded by the more typical channel facies of the Swanshaw Sandstone Formation. The main Chapeltown Burn exposure is tentatively extended eastwards to the south of Chapelton Farm [NS 2240 0434], where similar rock types were observed during preliminary reconnaissance mapping (see BGS 2001, NS20NW, NS20SW and NS20NE 1: 10 000 maps). Another outcrop in the upper part of Chapelton Burn [NS2537 0557-2556 0564] was clearly identified by Jones (2001). This outcrop has been mapped as a small lens, because very small exposures between this and the main exposure show red sandstones and conglomerates typical of the Swanshaw Sandstone Formation. This exposure may be joined with the main Chapelton Burn exposure.
has lithology description: A coarse-grained sandstone with a pinstripe lamination, a sheet-like erosively-based fine- and medium-grained sandstone with red, white and green siltstones and mudstones.
has thickness description: At least 145m thick, as estimated from the partial type section.
has upper boundary definition: The upper contact is faulted in Chapelton Burn at NS 2189 0467. To the east of the fault, within the Chapeltown Burn Member, the rock types are reddish-green mudstones and fine- to medium-grained sandstones. The fault plane is marked by a 1m-wide brecciated zone. To the west of the fault are flaggy red sandstones with cross-bedding, typical of the Swanshaw Sandstone Formation in this area.

Chirbury Group
type: Concept
in scheme: NamedRockUnit
alternative label: CBY
has current status: CURRENT
has theme: BEDRCK
notation: Cby
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41736
has lithology component: CBY MDST
has lithology component: CBY SDST
has lithology component: CBY VLSS
has source info: CBY_51670
has source info: CBY_52403
has obsolete equivalent: CBY mn 914
has obsolete equivalent: CBY mn 915
broader: NE
narrower: WTY
narrower: Hagley Volcanic Formation
narrower: SPW
has lower boundary definition: Base of Spy Wood Sandstone Formation.
has geographical distribution: Not defined.
has lithology description: Shales, volcaniclastic members and sandstones.
has thickness description: >1500m, but poorly exposed.
has upper boundary definition: Top not seen - unconformity.

Cwmbyr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CBYR
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CBYR COAL
broader: SWMCM

Castell Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Central Cumbria (Albion) Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CCAG
has current status: CURRENT
has theme: SPRFCL
notation: CCA
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41737
has lithology component: CCAG CLAY
has lithology component: CCAG DMTN
has lithology component: CCAG GRAV
has lithology component: CCAG PEAT
has lithology component: CCAG SANDU
has lithology component: CCAG SILT
has source info: CCAG_50151
has source info: CCAG_51617
has source info: CCAG_52327
has obsolete equivalent: CCAG mn 848
broader: Caledonia Glacigenic Group
narrower: THGTI
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: The central Lake District, Shap Fell and the Howgill Fells.
has lithology description: Including mappable units of diamicton, gravel, sand, silt and clay, typically yellowish or greyish brown and containing clasts derived from the Lake District, Shap Fell and the Howgill Fells, including welded tuff (Borrowdale Volcanics), slate, granite, granophyre, limestone and sandstone.
has thickness description: To 10m
has upper boundary definition: Locally the ground surface, but generally overlain unconformably by deposits of gravel, sand, silt, clay and peat of the Central Cumbria Glacigenic Subgroup.

Cathcart Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CCART
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CCART MCOLGB
broader: WMVAS

Cornubian Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CCAT
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41738
has lithology component: CCAT C
has lithology component: CCAT P
has lithology component: CCAT S
has lithology component: CCAT TUFA
has lithology component: CCAT V
has lithology component: CCAT Z
has source info: CCAT_50245
broader: Britannia Catchments Group
narrower: PETRO
narrower: TAVA
narrower: TAW
narrower: TORR
has additional age information: Mid Pleistocene to Holocene.
has lower boundary definition: Unconformable on bedrock of Devonian to Cretaceous age.
has geographical distribution: The catchments of the rivers of Devon and Cornwall from the River Axe westwards.
has lithology description: The Cornubian Catchments Subgroup encompasses all the fluvial, lacustrine and organic deposits of the rivers of Devon and Cornwall from the River Axe westwards. Floodplain alluvium comprises soft silts and clays, commonly with beds of peat and a basal bed of sand and gravel. River terrace deposits are largely sand and gravel. The gravels include a wide range of Palaeozoic and Mesozoic rocks, reflecting the rock types cropping out in the various catchments. Peat is a minor component, and minor marine deposits are included where they are intercalated in dominantly fluvial formations.
has thickness description: Up tp 22.5m recorded in the buried sub-drift valley of the 7th terrace of the Taw Valley Formation.
has upper boundary definition: Surface.

Corrycroar Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SA
broader: NE

Cot Castle Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CCBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: LWM

Lower Cwm Clyd Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CCBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
broader: NE

Upper Cwm Clyd Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CCBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
broader: NE

Cushendun Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: CCC CONG
has lithology component: CCC MDST
has lithology component: CCC SDST
has obsolete equivalent: CCC mn 1187
broader: Cross Slieve Group

Cot Castle Clayband
type: Concept
in scheme: NamedRockUnit
alternative label: CCCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Callander Craig Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41740
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41741
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41739
has lithology component: CCCO CONG
has lithology component: CCCO PESST
has lithology component: CCCO SDST
has source info: CCCO_49343
has source info: CCCO_51673
has source info: CCCO_52200
has obsolete equivalent: CCCO mn 756
broader: RLF
has lower boundary definition: A sharp contact with fine- to medium-grained lithic sandstones of the (undivided) Ruchill Flagstone Formation, but near Gartmore, the Conglomerate is underlain by a red silty mudstone.
has geographical distribution: The north-west limb of the Strathmore Syncline, from Kelty Water near Corrie, to Meall Leathan Dhail, and possibly to Auchnashelloch Hill (although disputed by Francis, E H et al, 1970).
has lithology description: A poorly sorted, matrix supported, typically well bedded (planar) conglomerate with coarse clasts which are commonly sub-angular to angular.
has thickness description: Up to 150 m thick at Callander, 50m at Beinn Liath [NN 578 040], and 2 m near Gartmore.
has upper boundary definition: A gradational contact with an overlying reddish grey, coarse- to fine-grained, locally pebbly, and commonly massive sandstone, of the undivided Ruchill Flagstone Formation.

Carrickarnan Complex Dolerites
type: Concept
in scheme: NamedRockUnit
alternative label: CCD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Cannock Chase Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: SSG

Cairnfield Calcareous Flag Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41742
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41743
has lithology component: CCFL CALSAM
has lithology component: CCFL CALSPL
has lithology component: CCFL MDOLO
has lithology component: CCFL MLMST
has lithology component: CCFL PEL
has source info: CCFL_48670
has source info: CCFL_49235
has source info: CCFL_50436
has source info: CCFL_50914
has obsolete equivalent: CCFL mn 743
broader: Lochaber Subgroup
narrower: Garron Point Tremolitic Flag Member
narrower: Crathie Point Calc-Silicate Member
has lower boundary definition: At incoming of calcareous (greenish, tremolite-bearing) psammites and semipelites above the non-calcareous Findlater Flag Formation.
has geographical distribution: 1) R. Fiddich NW of Dufftown to Forgie, Clochan and Cairnfield House (Sheets 85E and 95). 2) Craibstone and Deskford to Crathie Point and Garron Point (Sheet 96). (Below Keith Shear-Zone; probably equivalent stratigraphically to Pitlurg Calcareous Flag Formation above the Keith Shear-Zone.)
has lithology description: Calcareous, banded psammite and semipelite, grey and pale green, normally flaggy but schistose in places. Tremolitic amphibole commonly conspicuous in hand specimen. Thin beds of impure metalimestone locally.
has thickness description: c. 1200m in coastal section.
has upper boundary definition: Below graphitic pelites with beds of pure metalimestone comprising the Mortlach Graphitic Schist Formation.

Coralline Crag Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: NO
has predominant age: NO
has youngest age: NO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43301
has lithology component: CCG CALSST
has lithology component: CCG PHGV
has lithology component: CCG S
has lithology component: CCG V
has source info: CCG_49116
has source info: CCG_49673
has source info: CCG_50247
has source info: CCG_50522
has source info: CCG_50862
has lateral equivalent: CCG st 29
has lateral equivalent: CCG st 692
has lateral equivalent: CCG st 801
has obsolete equivalent: CCG mn 1050
broader: Crag Group
has additional age information: "Lower" [Early] Pliocene.
has lower boundary definition: Rests unconformably on the undulose, possibly tidally-scoured, surface of the Thames Group throughout its known distribution.
has geographical distribution: Restricted to southeast Suffolk, around Orford and Aldeburgh, as far north as Thorpeness and just into the adjacent offshore area. There are isoltated outliers at Ramsholt and Tattingstone.
has lithology description: Carbonate-rich skeletal sands. The acid-insoluble sand fraction is moderately- to poorly-sorted medium-grained sand, the mud content is low. Basal lag gravel rich in pebbles of phosphatic mudstone largely derived from the Thames Group.
has thickness description: c.25m maximum onshore.
has upper boundary definition: Overlain unconformably by rocks of the Norwich Crag Formation across most of its extent, but Red Crag Formation material is banked against a buried ridge of the Coralline Crag in some areas and thin Red Crag deposits overlie the Coralline Crag locally.

Cloalcleugh Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CCGH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CCGH COAL
broader: ULGS

Central Cumbria Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CCGL
has current status: CURRENT
has theme: SPRFCL
notation: CCG
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43302
has lithology component: CCGL CLAY
has lithology component: CCGL DMTN
has lithology component: CCGL GRAV
has lithology component: CCGL SANDU
has lithology component: CCGL SILT
has source info: CCGL_50151
has source info: CCGL_51617
has source info: CCGL_51980
has source info: CCGL_52327
has obsolete equivalent: CCGL mn 848
broader: Caledonia Glacigenic Group
narrower: Edenside Till Formation
narrower: WOCR
narrower: KLTI
narrower: LOBSG
narrower: TKTI
narrower: Blengdale Glacigenic Formation
has lower boundary definition: Generally unconformable on bedrock, but locally unconformable on older deposits of diamicton, gravel, sand, silt and clay assigned to the Central Cumbria (Albion) Glacigenic Subgroup.
has geographical distribution: The central Lake District, Shap Fell and the Howgill Fells.
has lithology description: Including mappable units of diamicton, gravel, sand, silt and clay, typically yellowish or greyish brown and containing clasts derived from the Lake District, Shap Fell amd Howgill Fells, including welded tuff (Borrowdale Volcanics), slate, granite, granophyre, limestone and sandstone.
has thickness description: To 30m
has upper boundary definition: Generally the ground surface, but commonly overlain unconformably by deposits of gravel, sand, silt, clay and peat of the Solway or Cumbria-Lancashire Catchments subgroups.

Craigcluggan Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CCGN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Caesar's Camp Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43303
has lithogenesis: FLUV
has lithology component: CCGR S
has lithology component: CCGR V
has lithology component: CCGR Z
has source info: CCGR_49006
has source info: CCGR_49668
has source info: CCGR_50259
has source info: CCGR_50260
has source info: CCGR_52491
has source info: CCGR_52559
has obsolete equivalent: CCGR mn 740
has obsolete equivalent: CCGR mn 741
broader: Dunwich Group
has additional age information: Early Pleistocene.
has lower boundary definition: Sharp, highly irregular contact with Palaeogene sands, obscured by a veneer of solifluction deposits.
has geographical distribution: Restricted to plateau remnants between Aldershot and Farnham, Surrey.
has lithology description: Unbedded and thickly bedded cobble gravel with interbedded coarse sands. Gravels are dominantly nodular flint to 0.2m diameter, with subordinate quartz and Greensand chert. The sand is subangular, dominantly quartz with some flint, and occurs as horizontal planar-bedded units, cross-bedded lenses, and channel-fill sands and silts. Fluvial and periglacial in origin, deposited by rivers draining to the northwest. Well-defined palaeosol in upper part of gravelly deposits, overlain by silty fine sand of aeolian origin.
has thickness description: To 6m
has upper boundary definition: Land surface; no overlying deposits.

Cowleaze Chine Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Cruachan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCHAN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: CCHAN BA
has lithology component: CCHAN FPBA
has lithology component: CCHAN FPHAW
has lithology component: CCHAN HAW
has lithology component: CCHAN MUG
has lithology component: CCHAN PCBA
broader: SKYL

Conachair Granite Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CCHG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: CCHG GN
broader: STKI

Colchester Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCHR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43304
has lithology component: CCHR C
has lithology component: CCHR P
has lithology component: CCHR S
has lithology component: CCHR V
has lithology component: CCHR Z
has source info: CCHR_49112
has source info: CCHR_49115
has source info: CCHR_49672
has source info: CCHR_50257
has source info: CCHR_50262
has source info: CCHR_50896
has source info: CCHR_50911
has source info: CCHR_51041
has source info: CCHR_51832
has source info: CCHR_52104
has lateral equivalent: CCHR st 41
has lateral equivalent: CCHR st 538
has lateral equivalent: CCHR st 922
has obsolete equivalent: CCHR mn 2183
has obsolete equivalent: CCHR mn 2185
has lateral equivalent: CCHR st 896
has obsolete equivalent: CCHR mn 1479
broader: KGCA
narrower: WLGR
has additional age information: Early Pleistocene to Mid Pleistocene.
has lower boundary definition: Unconformable on bedrock: Cretaceous, Palaeogene and Crag Group. Differentiation from the Crag Group can be difficult where the latter is reworked, and the distinction must be made on the basis of sedimentological structures: the Crag Group is marine, the Kesgrave Catchment Subgroup is fluvial.
has geographical distribution: The formation is restricted to the Thames Valley, Essex and Suffolk. It does not extend into Norfolk. (Hamblin and Moorlock, 1995).
has lithology description: The formation encompasses fluvial, lacustrine and organic deposits of the pre-diversionary River Thames. Most of the surviving deposits are fluvial gravels, with sedimentary structures indicating deposition by a braided river. Lacustrine silts and clays and organic peats are uncommon. The gravels of the formation are characterised by quartz and quartzite from the Triassic, Carboniferous and Devonian rocks of the West Midlands, Welsh borderland and possibly southwestern Pennines, and felsic volcanic rocks from northern Wales. These lithologies form a lower percentage than in the Sudbury Formation, and are believed to be derived from that formation, but mega-erratics and felsic volcanic rocks from Wales and the Welsh borderland occur with a generally greater frequency than in the Sudbury Formation. The fluvial gravels occupy terrace levels and the members are defined on the basis of altitude and pebble clast content. The members comprise bodies of cross-bedded and massive, moderately sorted sand and gravel. The aggredations are generally entrenched into bedrock with a difference in surface elevation in the order of 5m. Intraformational ice wedge casts and pollen indicate periglacial, cool temperate and warm temperate climates.
has thickness description: individual terrace aggradations are typically 5-12m thick, total thickness may locally reach c.21.3m.
has upper boundary definition: Commonly overlain by Middle Pleistocene glacigenic deposits. Upper boundary may be difficult to determine where overlain by glaciofluvial sand and gravel, but the presence of more angular clasts, chalk, and poorer sorting in the latter is usually helpful. The uppermost 1.0-1.5m of the formation is commonly affected by the Valley Farm Soil, a rubified and clay-enriched horizon, and/or by the Barham Arctic Structure Soil, a complex pedogenic horizon (Rose et al., 1985).

Carn Chuinneag And Inchbae Augen Gneiss
type: Concept
in scheme: NamedRockUnit
alternative label: CCIA
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
notation: CCAG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CCIA AMPHB
has lithology component: CCIA GNGNS
has source info: CCIA_50038
has source info: CCIA_52592
has obsolete equivalent: CCIA mn 794
broader: NA
has additional age information: Neoproterozoic (550 +/- 10Ma).

Corncockle Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43305
has lithology component: CCK SDST
has lithology component: CCK SLST
has source info: CCK_51349
has obsolete equivalent: CCK mn 4303
broader: STEW
has lower boundary definition: Rests unconformably on Lower Palaeozoic strata or on basal Permian breccias.
has geographical distribution: Lochmaben Basin, Dumfriesshire, south-western Scotand (Southern Uplands)
has lithology description: Fine- to medium-grained, well sorted, red quartz sandstone with large scale aeolian cross-bedding.
has thickness description: 900m+ on geophysical evidence.
has upper boundary definition: The Corncockle Sandstone Formation is stratigraphically the highest unit in the district.

Castell Coch Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43306
has lithology component: CCL CLMST
has lithology component: CCL CONG
has lithology component: CCL LMSG
has lithology component: CCL LMST
has lithology component: CCL MDST
has lithology component: CCL SDST
has source info: CCL_48717
has source info: CCL_49061
has source info: CCL_51233
has source info: CCL_51661
has source info: CCL_52830
has obsolete equivalent: CCL mn 314
broader: Avon Group
has lower boundary definition: Interbedded thin- to medium-bedded grey skeletal packstones and mudstones forming the upper part of the Tongwynlais Formation thicken upwards and pass up quickly, but gradationally, into the medium- to thick-bedded oolitic and skeletal grainstones of the Castell Coch Limestone Formation. The base of the Castell Coch Limestone Formation is taken at the incoming of a mudstone-free sequence. North of Risca, the Castell Coch Limestone Formation oversteps the Tongwynlais Formation to overlie the component formations of the Quartz Conglomerate Group. The base is taken at the sharp erosive contact between the green grey sandstones, quartz conglomerates and red and green mudstones of the Quartz Conglomerate Group and the overlying calcareous sandstones, sandy limestones, and skeletal and oolitic grainstones of the Castell Coch Limestone Formation. A persistent phosphatic, conglomeratic lag up to 0.7m thick is present at the base.
has geographical distribution: Vale of Glamorgan [ST 00 74] and South Wales Coalfield [SO 09 02], east of Swansea. Present but currently unmapped in the east crop of the South Wales Coalfield [ST 25 90], Gower [SS 50 90] and Monmouth and Chepstow areas [ST 53 93].
has lithology description: Grey, locally reddened, medium- to thick-bedded, cross-bedded, oolitic and skeletal grainstones deposited as part of a barrier complex. Thin units of grey mudstone, calcite mudstone and calcisiltite are locally present in the uppermost part of the Formation and represent back barrier peritidal deposits. North of Risca, conglomerates, calcareous sandstones and sandy limestones are present in the lowermost part.
has thickness description: 30m on the north crop of the South Wales Coalfield [Abergavenny], thinning southwards to 9m in the south of the Vale of Glamorgan.
has upper boundary definition: Where barrier mudstones, calcite mudstones and calcisiltites occupy the uppermost part of the formation, the top is taken at the sharp base of the overlying marine interbedded grey mudstones and packstones of the Cwmyniscoy Mudstone. The contact is commonly erosional and overlain by a packstone or grainstone bed rich in interclasts of the underlying back barrier mudstones. Where the uppermost part of the formation comprises barrier grainstones, the top is taken at the sharp incoming of the overlying interbedded grey mudstones and packstones of the Cwmyniscoy Mudstone Formation.

Cairn Of Claise Transition Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCLT
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CCLT QZITE
has source info: CCLT_49437
has source info: CCLT_50001
broader: Easdale Subgroup

Cwmyniscoy Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43307
has lithology component: CCM CASLST
has lithology component: CCM DOLMST
has lithology component: CCM LMST
has lithology component: CCM MDST
has source info: CCM_48717
has source info: CCM_51233
has source info: CCM_52620
has source info: CCM_52830
broader: Avon Group
has lower boundary definition: Where back barrier mudstones, calcite mudstones and calcisiltites occupy the uppermost part of the underlying Castell Coch Limestone Formation, the base of the Cwmyniscoy Mudstone Formation is taken at the sharp incoming of marine, interbedded grey mudstones and packstones. The contact is commonly erosional and overlain by a packstone or grainstone bed rich in intraclasts of the underlying back barrier mudstones. Where the uppermost part of the Castell Coch Limestone Formation comprises barrier grainstones, the base of the Cwmyniscoy Mudstone Formation is taken at the sharp incoming of interbedded grey mudstones and packstones.
has geographical distribution: Vale of Glamorgan [ST 00 74] and South Wales Coalfield [ST 06 81], east of Swansea. Present but unmapped in the east crop of the South Wales Coalfield [ST 25 90], Pembrokeshire [SM 99 01] and Monmouth and Chepstow [ST 53 93] areas.
has lithology description: Interbedded grey mudstones and thin- to medium-bedded skeletal packstones deposited in a mid-shelf environment.
has thickness description: 60m in the south of the Vale of Glamorgan, thinning northwards to 10m on the north crop of the South Wales Coalfield [Abergavenny].
has upper boundary definition: The contact of the Cwmyniscoy Mudstone Formation with the overlying Barry Harbour Limestone Formation is gradational. In the uppermost part of the Cwmyniscoy Mudstone Formation, the proportion of packstone beds increases to exceed that of mudstone. The top of the Cwmyniscoy Mudstone Formation is taken at the top of the last significant mudstone bed above which the succession becomes dominated by stacked fine and coarse skeletal packstones with scattered thin beds and partings of calcareous mudstone. In the north crop of the South Wakes Coalfield, the Cwmyniscoy Mudstone Formation is overlain by the Sychnant Dolomite Formation or the Pwll-y-cwm Oolite Formation. The junction with the Sychnant Dolomite Formation is gradational. Thin beds of calcite mudstone and dolomitic limestone appear in the uppermost part of the Cwmyniscoy Mudstone Formation mudstone/packstone sequence. The top of the formation is taken at the incoming of abundant, thin-bedded, fine-grained, dolomitised skeletal packstones of the Sychnant Dolomite Formation. The contact with the Pwll-y-cwm Oolite Formation is sharp and taken at the incoming of thick-bedded pale grey oolitic grainstone above the interbedded mudstones and packstones of the Cwmyniscoy Mudstone Formation.

Caldon Low Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: HP

Cumbrian Coast Group
type: Concept
in scheme: NamedRockUnit
alternative label: CCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43308
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43309
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43310
has lithology component: CCO CALSST
has lithology component: CCO DOLO
has lithology component: CCO HALI
has lithology component: CCO MDST
has lithology component: CCO NCSLTR
has lithology component: CCO SDST
has lithology component: CCO SLMDST
has lithology component: CCO SLST
has source info: CCO_48699
has source info: CCO_49950
has source info: CCO_50613
has source info: CCO_51466
has source info: CCO_51664
has source info: CCO_52391
broader: NP
narrower: SBE
narrower: SBSH
narrower: Eden Shales Formation
narrower: MM
narrower: Barrowmouth Mudstone Formation
has lower boundary definition: Point in sequence where there is a sharp upwards change from either Brockram or red sandstone, to grey siltstones or dolomites.
has geographical distribution: North and east Irish Sea and bordering land areas west of the Pennines including west Cumbria, Vale of Eden, south Cumbria, Lancashire and north-east Cheshire, ie the 'Bakevellia Sea Basin' of Smith and others (1974); see also Jackson and others, 1987.
has lithology description: Comprises a basal sequence of grey siltstones and dolomites overlain by evaporites (St Bees Evaporite Formation), overlain by red siltstones, silty mudstones and calcareous sandstones (St Bees Shale Formation), which locally pass laterally into halite.
has thickness description: Ranges from 36m in type section to 300m+ in Irish Sea grabens.
has upper boundary definition: Tends to be gradational therefore taken arbitrarily where sandstone (St Bees Sandstone Formation) becomes predominent over siltstone (St Bees Shale Formation).

Cracoe Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCOE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43311
has lithology component: CCOE LMST
has source info: CCOE_49106
has source info: CCOE_50498
has obsolete equivalent: CCOE mn 2757
broader: Great Scar Limestone Group
has additional age information: ?Holkerian to Brigantian.
has lower boundary definition: The lower boundary has not been proved, but it is likely to comprise reef limestones of the Cracoe Limestone Formation resting upon the bedded, medium to medium-dark grey limestone of the Scaleber Quarry Limestone Member.
has geographical distribution: South of the Middle Craven Fault, occurring in a roughly west-east tract extending 20km east from Settle [SD83 63] to Burnsall [SE 01 61]. The apron reef has become dislocated into fault slices along the Craven Fault System. The formation passes northwards into the Cove Limestone and Gordale Limestone members and probably also the Lower Hawes Limestone (Alston Formation).
has lithology description: Medium and medium-pale grey limestones ranging from organic boundstones to packstones and wackestones with a variable grainsize depending on the bioclastic components.
has thickness description: Total thickness not proved, but in excess of 100m at the type locality.
has upper boundary definition: The upper boundary is a marked unconformity, with the reef limestones of the Cracoe Limestone Formation overlain by dark grey mudstones of the Bowland Shale Formation.

Castell Crug Porphyritic Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: CCPM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ON
has lithology component: CCPM MCGN
has source info: CCPM_50909
broader: NA
has lower boundary definition: Not seen.
has geographical distribution: Not specified.
has lithology description: Pale-weathering, flow-foliated, locally porphyritic microgranite.
has thickness description: Unknown.
has upper boundary definition: Overlain unconformably by a local Caradoc conglomerate.

Cam Crags Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43312
has lithology component: CCR VCBR
has lithology component: CCR VCSST
has lithology component: CCR VSSTP
has source info: CCR_52187
broader: SET
has lower boundary definition: Gradational (conformable) contact with bedded sandstone, within the Saethwaite fell Sandstone Formation.
has geographical distribution: Lake District, Central Fells.
has lithology description: Coarse-grained volcaniclastic sandstone and breccia, pebble breccia, pebbly sandstone, dark brown weathered..
has thickness description: 0 - 275m
has upper boundary definition: Overlain (conformably) by siltstone, sandstone and breccia, within the Seathwaite Fell Sandstone Formation.

Calcrete
type: Concept
in scheme: NamedRockUnit
alternative label: CCRET
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Duricrust

Cumcrook Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CCRK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CCRK LMST
broader: TYLS

Crying Crag Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CCS SDST
broader: Border Group

Coalcleugh Shell Band
type: Concept
in scheme: NamedRockUnit
alternative label: CCSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CCSB LMST
has lithology component: CCSB SHMDST
broader: MG

Clay Cross Soft Coal (Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CCSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CCSC COAL
broader: PLCM

Cot Castle Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CCSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CCSH MDST
has lateral equivalent: CCSH BSB
broader: HON
has geographical distribution: Area of Cot Castle, near Strathaven, Lanarkshire.

Cannel Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CCSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43313
has lithology component: CCSL COAL
has source info: CCSL_49030
has source info: CCSL_52355
has source info: CCSL_52618
has source info: CCSL_52858
has lateral equivalent: CCSL st 166
has obsolete equivalent: CCSL mn 773
broader: PLCM
has lower boundary definition: Base of first coal above mudstones of the Pennine Lower Coal Measures Formation overlying the Upper Mountain Coal..
has geographical distribution: Burnley [SD 83 32] (South Lancashire).
has lithology description: Coal
has thickness description: 0.9m maximum.
has upper boundary definition: Base of mudstone-dominated unit of the Pennine Lower Coal Measures Formation resting on the Cannel Coal.

Capel Curig Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CCV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43314
has lithology component: CCV TUF
has source info: CCV_50521
has source info: CCV_50727
broader: LLV
narrower: Garth Tuff Member
narrower: LVT
has lower boundary definition: Conformable on sandstones and/or mudstones of undivided Nant Ffrancon Group.
has geographical distribution: Northern and central Snowdonia.
has lithology description: Acid ash-flow tuff.
has thickness description: Up to 340m
has upper boundary definition: At base of sandstones of Cwm Eigiau Formation.

Castle Of Cowie Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43315
has lithology component: CCW SDST
has lithology component: CCW SLSST
has lithology component: CCW SLST
has source info: CCW_48877
has source info: CCW_50622
has source info: CCW_51673
broader: Cowie Sandstone Formation
has lower boundary definition: At the base of the lowest metre-thick red siltstone above the Purple Sandstone 'Member'.
has geographical distribution: Stonehaven area.
has lithology description: Medium-grained, quartzo-feldspathic sandstone interbedded with red siltstone and silty sandstone.
has thickness description: 74 m thick.
has upper boundary definition: At the top of the highest metre-thick red siltstone bed beneath the Brown and Grey Sandstone 'Member'.

Covehithe Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CCY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QV
has predominant age: QV
has youngest age: QV
broader: NCG

Crosswood Ash
type: Concept
in scheme: NamedRockUnit
alternative label: CDA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CDA VLSS
broader: NE

Cushendall Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDAL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: CDAL CONG
has lithology component: CDAL MDST
has lithology component: CDAL SDST
broader: Cross Slieve Group

Caddroun Burn Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CDB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Church Door Buttress Breccias
type: Concept
in scheme: NamedRockUnit
alternative label: CDBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: TSIG

Coed Caedyrys Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CDCA
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CDCA COAL
broader: NE

Clod Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: CDCC
has current status: CURRENT
has theme: BEDRCK
notation: C
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CDCC COAL
broader: PLCM

Clod Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CDCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CDCO COAL
broader: PUCM

Caedavid Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CDDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CDDC COAL
broader: SWMCM

Cardingmill Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDDG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43316
has lithology component: CDDG SDST
has lithology component: CDDG SLST
has source info: CDDG_49285
has source info: CDDG_50177
has source info: CDDG_50414
has source info: CDDG_50491
has source info: CDDG_50574
has source info: CDDG_50822
has obsolete equivalent: CDDG mn 782
has obsolete equivalent: CDDG mn 783
broader: Burway Formation
has additional age information: Late Neoproterozoic.
has lower boundary definition: The base is transitional over a few metres, but is generally taken at the base of the first thick bed of coarse grained sandstone that succeeds relatively thinly interbedded fine grained, cross-bedded sandstones and mudstones of the Burway Formation.
has geographical distribution: Welsh Borderlands, Shropshire, Church Stretton and the Longmynd area.
has lithology description: Massive to thick-bedded and cross-bedded coarse-grained sandstones, commonly micaceous and locally pebbly, with a few thin siltstone beds.
has thickness description: Usually 25-30 m, but may achieve 58 m locally.
has upper boundary definition: Drawn at the relatively sharp conformable upward passage from coarse sandstones of the Cardingmill Grit to purple mudstones and siltstones of the Synalds Formation.

Cribyn Ddu Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDDU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: TRB

Calders Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CDE
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43317
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43319
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43318
has lithology component: CDE ARLMST
has lithology component: CDE BATUF
has lithology component: CDE MDST
has lithology component: CDE SAPEL
has lithology component: CDE SDST
has lithology component: CDE TUF
has source info: CDE_48973
has source info: CDE_51455
has source info: CDE_52142
has source info: CDE_52346
broader: WLO
narrower: Dalmahoy Shale
narrower: HSS
narrower: HUSB
narrower: PMSH
narrower: PNSB
narrower: QCS
narrower: RDH
has lower boundary definition: The Redhall (Humbie) Marine Band defines the base of the member, the lowest of the Macgregor Marine Bands. This bed is up to 0.3m thick and in Edinburgh is contained within at least 13.8 m of generally tough, black and dark grey mudstones, the lowest 9m of which form the top of the underlying Gullane Formation (Chisholm and Brand, 1994, p.100) and assigned to the currently undefined Wardie Shales Member.
has geographical distribution: West Lothian; Midlothian (part).
has lithology description: The Calders Member comprises a succession of black to grey mudstones, grey siltstones and white, grey and pink sandstones with thin beds of grey argillaceous limestones and dolostone (cementstone), and algal-rich black to grey oil-shales with some lapilli-tuff beds. The strata are not disposed in readily recognisable sedimentary cycles, and almost all are of lacustrine and fluvial origins. The member includes the Dalmahoy Oil-Shale, Hailes Sandstone (with a maximum thickness of about 57m that was much worked in the past for dimension stone, and the Pumpherston Oil-Shale. A regionally persistent but thin (<1 m thick) algal dolostone has been recognised at Hopetoun and Queensferry.
has thickness description: The average thickness is 290m (Cameron and McAdam, 1978, fig.2), but it is estimated to reach 350m west of Edinburgh.
has upper boundary definition: Defined as the base of the Burdiehouse Limestone (Mitchell and Mykura, 1962, p.67). This distinctive limestone, at the base of the overlying Hopetoun Member, is a lacustrine deposit, 6 - 9m thick, containing abundant fossilised ostracod, plant and fish remains and rare algal oncoliths.

Cadeby Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CdF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43320
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43321
has lithology component: CDF CAMDST
has lithology component: CDF DOLMST
has lithology component: CDF DOLO
has lithology component: CDF MDST
has lithology component: CDF SDST
has lithology component: CDF SLST
has source info: CDF_52588
has lateral equivalent: CDF st 690
has obsolete equivalent: CDF mn 2624
has obsolete equivalent: CDF mn 731
broader: ZG
narrower: WETH
narrower: SPRO
has lower boundary definition: At base of dolostone or dolomitic siltstone, overlying organic-rich mudstone (Marl Slate) or where that is absent, Permian basal sands and breccias.
has geographical distribution: Crops out in Nottinghamshire, south Yorkshire, west Yorkshire and part of north Yorkshire. Thickens in subsurface to east. Dies out south of line from Nottingham to Grantham. Equivalent to Raisby Formation of Co. Durham.
has lithology description: Dolostone, grey to buff grey, commonly oolitic or granular, with subordinate mudstone, dolomitic siltstone and sandstone.
has thickness description: 0-100m
has upper boundary definition: At upward transition (usually sharp) into Edlington Formation or, farther east in the subsurface, the Hayton Anhydrite.

Craig An Daimh Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDGR
has current status: CURRENT
has theme: SPRFCL
notation: CAD
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43323
has lithology component: CDGR C
has lithology component: CDGR S
has lithology component: CDGR V
has lithology component: CDGR Z
has source info: CDGR_49716
has source info: CDGR_50681
has source info: CDGR_50834
has source info: CDGR_52490
has lateral equivalent: CDGR st 222
has obsolete equivalent: CDGR mn 1207
broader: IAG
has lower boundary definition: Sharp, undulating, erosional, unconformable contact with stony sandy clayey diamicton of the Suidheig Till Formation.
has geographical distribution: Sheet 84W (Fortrose), southeast of Inverness.
has lithology description: Cobble gravel with a sandy, silty,clayey matrix, clast-supported, very dense, containing clasts mainly of Devonian sandstones and siltstones, with some granite and psammite. Strong weathering profile developed with pelitic schist clasts decomposed.
has thickness description: 3m
has upper boundary definition: Gradational contact with white clayey gravel of the Rehiran Cryoturbate Member of the Dalcharn Palaeosol Formation.

Clifton Down Group And Hotwells Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CDHO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: CDHO COAL
has lithology component: CDHO CSSST
has lithology component: CDHO LMOOL
has lithology component: CDHO LMST
has lithology component: CDHO MDST
has lithology component: CDHO SDST
broader: NE
has lower boundary definition: Boundary is marked by the incoming of more massive oolitic and crinoidal rocks above the relatively unfossiliferous calcite-mudstones of the Clifton Down Group, or where present, the Middle Cromhall Sandstone.
has geographical distribution: Bristol and north Somerset area. Lateral facies change to west south Wales and Forest of Dean.
has lithology description: Hard dark grey crinoidal oolitic bioclastic limestone with interbedded dark grey shales and mudstones.
has thickness description: 175 feet (54m).
has upper boundary definition: Change to predominantly arenaceous sandstone facies of the Upper Cromhall Sandstone or the sub-Namurian unconformity.

Creag Dhubh Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDHP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43325
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43324
has lithology component: CDHP CALSIR
has lithology component: CDHP PEL
has lithology component: CDHP PSAMI
has lithology component: CDHP PSAMM
has lithology component: CDHP SEMPEL
has source info: CDHP_51186
has obsolete equivalent: CDHP mn 3216
broader: Corrieyairack Subgroup
has lower boundary definition: Top of the Torr na Truim Semipelite Formation, where predominantly schistose semipelite is overlain by the flaggy bedded, predominantly psammitic succession belonging to the Creag Dhubh Psammite Formation.
has geographical distribution: Southwest of Newtonmore, from Glen Banchor southwards to the Ericht-Laidon Fault
has lithology description: Grey flaggy quartzo-feldspathic psammite with micaceous psammite interlayers grading into micaceous pelitic tops, including muscovite and biotite. Psammites 10 to 40cm thick are common, thinner near the base; amalgamated psammites up to 6m thick are known. Semipelites/pelites are usually about 1cm thick but locally up to 20cm thick.
has thickness description: c.700m +
has upper boundary definition: Base of the Creag na Sanais Semipelite Formation, where predominantly gneissose semipelite overlies the psammitic succession belonging to the Creag Dhubh Psammite Formation.

Cleveland Ironstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cdi
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43326
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43327
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43328
has lithology component: CDI FEST
has lithology component: CDI SLMDST
has lithology component: CDI SLSST
has lithology component: CDI SLST
has source info: CDI_49470
has source info: CDI_49474
has source info: CDI_51268
has source info: CDI_52079
has source info: CDI_52922
has obsolete equivalent: CDI mn 954
has obsolete equivalent: CDI st 445
has obsolete equivalent: CDI mn 2189
broader: LI
narrower: Two-Foot Ironstone Seam
narrower: Avicula Ironstone Seam
narrower: MIRS
narrower: PIRS
has lower boundary definition: Downward transition from shaly mudstone with scattered sideritic nodules to siltstone or sandstone of the Staithes Sandstone Formation.
has geographical distribution: Cleveland Basin, North Yorkshire.
has lithology description: Mudstone, silty, argillaceous siltstone and silty sandstone with seams of sideritic and berthierine-ooidal ironstone, which occur typically at the tops of small scale sedimentary cycles.
has thickness description: To c.25m
has upper boundary definition: At top of highest ooidal ironstone OR at top of row of hard sideritic nodules, succeeded by grey mudstone of the Whitby Mudstone Formation.

Clifton Down Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CDL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43329
has lithology component: CDL CHRT
has lithology component: CDL DOLMST
has lithology component: CDL LMST
has lithology component: CDL MDST
has source info: CDL_49355
has source info: CDL_51718
has source info: CDL_52565
has obsolete equivalent: CDL mn 888
has obsolete equivalent: CDL mn 3813
has lateral equivalent: CDL st 269
broader: PEMB
narrower: Cheddar Limestone Member
narrower: Cheddar Oolite Member
has lower boundary definition: In the Bristol area taken at the sharp contact between the interbedded dolomite and calcite mudstones of the underlying Clifton Down Mudstone Formation and the basal sandy limestone of the Clifton Down Limestone Formation. The boundary needs further investigation. In Broadfield Down and the Mendip Hills it is taken at the incoming of calcite mudstones of the Clifton Down Limestone Formation above the oolitic and oolitic/bioclastic limestones of the Goblin Combe Oolite Formation and undivided Burrington Oolite Subgroup respectively.
has geographical distribution: Bristol [ST 60 74] area and Mendip [ST 50 53]. Passes laterally into the Hunts Bay Oolite Subgroup in the Monmouth and Chepstow area [ST 53 94].
has lithology description: Splintery dark grey calcite and dolomite mudstones, pale grey oolitic, dark grey bioclastic and oncolitic limestones and some mudstones. Scattered cherts and silicified fossils in lower half. Sandy limestone at base in Bristol area. Deposited in a barrier/back barrier/shelf lagoon setting.
has thickness description: 266m in the Avon Gorge at Bristol, thinning northwards to 137m north of Bristol and thinning southwards to 150-200m in the Mendip Hills.
has upper boundary definition: Taken at the top of the last calcite mudstones of the formation, above which occur the dark grey crinoidal and bioclastic limestones and paler oolitic limestones of the Oxwich Head Limestone Formation.

Carlingford Limestone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CDLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
broader: NE

Cadell's Parrot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CDLP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: CDLP COAL
broader: ULGS

Cadgers Loan Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CDLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43330
has lithology component: CDLS PESST
has lithology component: CDLS SDST
has source info: CDLS_49343
has obsolete equivalent: CDLS mn 732
broader: ULGS
has lower boundary definition: Conformable.
has geographical distribution: Glasgow-Airdrie area, Central Coalfield.
has lithology description: Sandstone with pebbly bands and garnets.
has thickness description: c.90 feet. (c.100 feet near Fallin, Cowie, and Carbrook; 155 feet in Doll Mill Bore).
has upper boundary definition: Conformable.

Clifton Down Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43331
has lithology component: CDM BA
has lithology component: CDM BALAVA
has lithology component: CDM CLMST
has lithology component: CDM DLMDST
has lithology component: CDM LMST
has lithology component: CDM MDST
has lithology component: CDM TUF
has source info: CDM_49355
has source info: CDM_50203
has source info: CDM_51166
has source info: CDM_51767
has source info: CDM_52591
has obsolete equivalent: CDM mn 771
has obsolete equivalent: CDM mn 2542
has lateral equivalent: CDM st 911
has obsolete equivalent: CDM mn 2866
has obsolete equivalent: CDM mn 4351
broader: PEMB
has lower boundary definition: Taken at irregular erosive contact of dolomite and calcite mudstones and mudstones of the formation above the clay palaesol of the underlying Gully Oolite Formation.
has geographical distribution: Bristol [ST 60 74] area and Broadfield Down [ST 50 65]. Passes northwestwards into the Llanelly Formation of South Wales and southwards into the Burrington Oolite Subgroup of the Mendip Hills.
has lithology description: Thin- to medium-bedded poorly fossiliferous, calcite mudstones, dolomite mudstones and mudstones. A unit of crinoidal and oolitic limestones occurs in the middle of the Formation, and a 15m-thick unit of oolitic and crinoidal limestone occurs in the upper part of Formation [said to correlate with the Goblin Combe Oolite Formation of Broadfield Down, but this is not proven]. Basalt, tuff and ashy limestone are present in the middle of the Formation on Broadfield Down. Carbonates of the Formation were deposited mainly in a back barrier setting.
has thickness description: 60m at Bristol and northern Broadfield Down thinning to a feather edge on the southern side of Broadfield Down.
has upper boundary definition: In the Bristol area the upper boundary is taken at the sharp contact between the interbedded dolomite and calcite mudstones and mudstones of the formation and the basal sandy limestone of the overlying Clifton Down Limestone Formation. The boundary needs further investigation. In Broadfield Down the upper boundary is taken at the incoming of ooidal limestones of the Goblin Combe Oolite Formation above the interbedded dolomite and calcite mudstones and mudstones of the Clifton Down Mudstone Formation.

Chemiss Den Marine Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CDMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Cwm Degwel Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDMD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CDMD MDST
has source info: CDMD_51485
broader: Dinas Island Formation
has additional age information: Caradoc (?Onnian).
has lower boundary definition: Conformable with the sandstones of the main part of the Dinas Island Formation.
has lithology description: Interbedded dark grey to black turbiditic and laminated hemipagic mudstones.
has thickness description: To 60m
has upper boundary definition: Overlain by burrow-mottled mudstones of the Nantmel Formation, the boundary possibly represents a non-sequence.

Calder Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDMM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has obsolete equivalent: CDMM mn 753
broader: LYBR

Charmouth Mudstone Formation, Dyrham Formation And Marlstone Rock Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CDMR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
has lithology component: CDMR ARLMST
has lithology component: CDMR AROC
has lithology component: CDMR CALSST
has lithology component: CDMR FEOOL
has lithology component: CDMR FEST
has lithology component: CDMR LMOOL
has lithology component: CDMR LMST
has lithology component: CDMR MDST
has lithology component: CDMR PHOST
has lithology component: CDMR SAMDST
has lithology component: CDMR SANDU
has lithology component: CDMR SDST
has lithology component: CDMR SLMDST
broader: LI
has lithology description: See the Lithology descriptions for the component formations.

Charmouth Mudstone Formation, Dyrham Formation, Marlstone Rock Formation And Whitby Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CDMW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
broader: LI

Cairndinnis Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CDNIS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: CDNIS BAPOCM
broader: SSDLO

Criffel-Dalbeattie Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CDPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CDPL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43334
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43335
has lithology component: CDPL GDFO
has lithology component: CDPL GNP
has lithology component: CDPL MCGNA
has source info: CDPL_49517
has source info: CDPL_50087
has source info: CDPL_50966
has source info: CDPL_52531
has lateral equivalent: CDPL st 229
has obsolete equivalent: CDPL mn 1133
broader: Galloway Granitic Suite
has lower boundary definition: Intrusive margin of the pluton against surrounding contact metamorphosed rock.
has geographical distribution: The pluton is exposed in south-west Scotland. It extends from Auchencairn Bay [NX 83 52] in the south-west to Mabie Forest [NX 94 71] in the north-east.
has lithology description: An asymmetrically zoned intrusive body with an inner zone of medium- to coarse-grained porphyritic granite and an outer zone of foliated granodiorite. Both zones are intruded by thin aplite veins. A series of microdiorite dykes are linked genetically to the intrusion of the pluton.
has thickness description: Modelling of gravity data indicates that it extends to a depth of 9km. (Lintern, B C and Floyd, J D. 2000; Bott and Masson Smith, 1960).
has upper boundary definition: Not applicable.

Carn Dubh Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43336
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43337
has lithology component: CDQU MDIAMT
has lithology component: CDQU QZITE
has lithology component: CDQU QZTPB
has source info: CDQU_51786
has source info: CDQU_52164
has obsolete equivalent: CDQU mn 3221
broader: Creag Leacach Quartzite Formation
has lower boundary definition: Position where dominantly quartzite succession replaces the dominantly graphitic succession of the Blair Atholl Subgroup.
has geographical distribution: Northern part of Glen Shee district (Sheet 56W).
has lithology description: Clean white pebbly quartzite with cross-bedding.
has thickness description: To 200m
has upper boundary definition: Top of clean white thickly bedded quartzites below the more thinly bedded, cream and less clean quartzites of the Bad an Loin Member.

Cheddar Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDRL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43338
has lithology component: CDRL CHRT
has lithology component: CDRL LMST
has source info: CDRL_51762
has obsolete equivalent: CDRL mn 888
broader: Clifton Down Limestone Formation
has lower boundary definition: Taken at the appearance of dark limestones of the Cheddar Limestone Member above the ooidal and ooidal/crinoidal limestones of the Burrington Oolite Subgroup. Boundary equates with local base of the Clifton Down Limestone Formation.
has geographical distribution: Chedder [ST 48 54] area, central Mendip. Passes laterally into rocks of the Clifton Down Limestone Formation in all directions.
has lithology description: Dark grey crinoidal and splintery limestones, with chert in the upper part.
has thickness description: 30-37m in the Cheddar area.
has upper boundary definition: Taken at the incoming of pale grey ooidal limestones of the Cheddar Oolite Member above the dark limestones of the Cheddar Limestone Member.

Cheddar Oolite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CDRO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43339
has lithology component: CDRO LMST
has source info: CDRO_51762
has obsolete equivalent: CDRO mn 889
broader: Clifton Down Limestone Formation
has lower boundary definition: Taken at the incoming of pale grey ooidal limestones of the Cheddar Oolite Member above the dark limetones of the Cheddar Limestone Member.
has geographical distribution: Chedder [ST 48 54] area, south-central Mendip. Passes laterally into the Clifton Down Limestone Formation in all directions.
has lithology description: Pale grey ooidal limestone.
has thickness description: 36 to 60m in the Cheddar area, south-central Mendip.
has upper boundary definition: Taken at the incoming of dark grey fine-grained limestone, rich in corals, of the undivided Clifton Down Limestone Formation, above the pale ooidal limestone of the Cheddar Oolite Member.

Cheddleton Sandstones
type: Concept
in scheme: NamedRockUnit
alternative label: CDS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CK
has lithology component: CDS SDST
broader: Bowland Shale Formation

Staithes Sandstone Formation And Cleveland Ironstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CDST
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has lithology component: CDST FEST
has lithology component: CDST MDST
has lithology component: CDST SDST
has lithology component: CDST SLST
broader: LI
has lithology description: See the Lithology descriptions for the component formations.

Coire Dubh Breccias
type: Concept
in scheme: NamedRockUnit
alternative label: CDUBH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CDUBH VCBR
broader: NE

Coed Duon Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDVO
has current status: CURRENT
has theme: BEDRCK
notation: CD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43340
has lithology component: CDVO FTUFF
has lithology component: CDVO RY
has source info: CDVO_52936
broader: NA
has lower boundary definition: In the type area, the Formation rests conformably upon pale grey, thin- to thick-bedded arkosic sandstone of the Ffairfach Grit Formation. The lower boundary is not exposed but is taken at the incoming of green, tuffaceous beds, constrained near the summit of Coed Duon.
has geographical distribution: The Coed Duon Volcanic Formation is restricted to the summit and southeastern slopes of Coed Duon, located around 8km eastnortheast of the town of Llandeilo in Carmarthenshire.
has lithology description: The Coed Duon Volcanic Formation comprises around 60m of green, fine-grained felsic tuff with abundant mafic crystal and rhyolitic lithic clasts, locally overlain by around 15m of white-weathering, fine-grained, pink rhyolite.
has thickness description: Around 75m
has upper boundary definition: The Formation is conformably overlain by buff-weathering, thinly interbedded sandstone, siltstone and limestone of the Llandeilo Flags Formation. The upper boundary is not exposed but is taken at the top of the last outcrop of pale rhyolite or tuff.

Silts And Clays Of 25-Foot Drift Of Vale Of York
type: Concept
in scheme: NamedRockUnit
alternative label: CDVY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: GLACI
has lithology component: CDVY CLAY
has lithology component: CDVY SILT
broader: NE
has lithology description: Silt and clay. [Generic description].

Coldwell Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CDW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cdw
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43341
has lithology component: CDW CALSST
has lithology component: CDW MDHLM
has lithology component: CDW SLST
has source info: CDW_49249
has source info: CDW_50498
has source info: CDW_52056
has source info: CDW_52353
has source info: CDW_52930
has obsolete equivalent: CDW mn 1003
has obsolete equivalent: CDW CDW
has obsolete equivalent: CDW mn 2837
is obsolete equivalent of: CDW CDW
broader: TNTH
narrower: High Cross Member
narrower: RPE
has lower boundary definition: Conformably overlies the Birk Riggs Formation.
has geographical distribution: Occurs towards the base of the Windermere Supergroup and crops out as a narrow strip across the southeastern part of the Lake District from Millom to east of Windermere. It also occurs south of the Kirkby Fault in Furness, and in the Howgill Fells.
has lithology description: Comprises a lower unit of heavily bioturbated, calcareous siltstone with subordinate laminated muddy siltstones, which is the Randy Pike Member, overlain by laminated hemipelagite and then another unit of calcareous siltstone with laminated muddy siltstone in the upper part , which is the High Cross Member.
has thickness description: From 55m to 80m
has upper boundary definition: Conformably overlain by the Wray Castle Formation.

Cille No.1 Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CE1C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CE1C COAL
broader: Hughes Member

Cille No.2 Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CE2C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CE2C COAL
broader: Hughes Member

Cille No.3 Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CE3C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CE3C COAL
broader: Hughes Member

Cille No.5 Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CE5C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CE5C COAL
broader: Hughes Member

Cumbrian Esk Alluvium Member
type: Concept
in scheme: NamedRockUnit
alternative label: CEAL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43342
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43343
has lithology component: CEAL C
has lithology component: CEAL S
has lithology component: CEAL V
has lithology component: CEAL Z
has source info: CEAL_48926
has source info: CEAL_51754
has obsolete equivalent: CEAL ALV
broader: Cumbrian Esk Valley Formation
has lower boundary definition: Sharply erosional, unconformable on all older Quaternary deposits (particularly till at the Type Section) and on bedrock.
has geographical distribution: 1:50k Sheet 37 Gosforth, south of Muncaster Fell.
has lithology description: Silts, clays, sands and gravels, underlying the floodplains of the Cumbrian Esk catchment. At the Type Section the top part of the alluvial sequence coarsens downwards from brown clay into sand.
has thickness description: 11.58m at the Type Section, but probably typically 5 to 10m thick in the type area.
has upper boundary definition: The ground surface, or overlain by peat of the Blelhem Peat Formation, or overlain by blown sand of the Drigg Point Sand Formation.

Ceardaich Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEAR
has current status: CURRENT
has theme: SPRFCL
notation: cear
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43344
has lithology component: CEAR GRAV
has lithology component: CEAR SANDU
has lithology component: CEAR SILT
has source info: CEAR_51577
broader: Central Grampian Glacigenic Subgroup
has additional age information: Early Devensian to Late Devensian
has lower boundary definition: Unconformable on bedrock; erosional on Pattack Till Formation; gradational on Linn of Pattack Silt Formation.
has geographical distribution: Central Grampian Mountains of Scotland.
has lithology description: Sand and gravel; clasts mainly psammite, with granodiorite, granite and porphyry; large scale deltaic cross-bedding common.
has thickness description: 5m
has upper boundary definition: Unconformable or glacitectonic contact with Ardverikie Till Formation.

Cennen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has obsolete equivalent: CEB mn 844
broader: NA

Carlyle Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CEBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CEBS LMST
has lithology component: CEBS MDST
broader: TYLS

Cooper Eye Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: CEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CEC COAL
broader: NE

Srath Na Creitheach Volcaniclastic Rocks (Skye Central Complex)
type: Concept
in scheme: NamedRockUnit
alternative label: CECH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: CE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CECH BA
has lithology component: CECH GBBY
has lithology component: CECH VLSS
broader: NE

Chale Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CECL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Cille Coals (Undifferentiated) (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CECU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CECU COAL
broader: Hughes Member

Castle Eden Fissure-Fill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEDN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: MZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43345
has lithology component: CEDN BREC
has source info: CEDN_49690
has source info: CEDN_49811
has source info: CEDN_50508
has source info: CEDN_50596
has source info: CEDN_52728
has lateral equivalent: CEDN st 114
has obsolete equivalent: CEDN mn 1368
broader: Great Britain Superficial Deposits Supergroup
has lower boundary definition: Unconformable contact with underlying fractured limestones and dolostones of the Zechstein Group (formerly Magnesian Limestone). The fissures are generally linear, vary from 1 to 7m wide and extend up to 25m vertically through the limestone cliffs to rockhead, locally along faults. Other fissure fills are cylindrical in shape. Fissure walls commonly bear subvertical slickensides resulting from compaction and many of the fragments are striated and polished.
has geographical distribution: Coast of County Durham.
has lithology description: Breccia formed of limestone and dolostone together with sparse clasts of red mudstone filling subvertical karstic fissures in the limestone and dolostones of the Zechstein Group (formerly Magnesian Limestone). Two distinct units occur. The lower "unfossiliferous fissure fills" are likely to be either Mesozoic or early Palaeogene in age as they are similar to evaporite dissolution breccias that occur elsewhere within the Permian limestones. The upper "fossiliferous fissure fills" contain clay in addition to limestone debris that has yielded assemblages of partially pyritized organic material including peat, seeds, tree trunks, ostrocods, mammalian bones and freshwater molluscs. The remains of over 100 species of plant have been identified from lower parts. Of this "Castle Eden Flora" 64% of the species no longer grow in Britain, or are extinct. This flora suggests an Early Pleistocene age, which is supported by the identification of Mammuthus meridionalis, an elephant that was common in Europe in the Early Pleistocene up to the Cromerian. Sparse glacial erratics of supposed Scandinavian origin have been found in fissure fill deposits south of Limekiln Gill [NZ 4776 3813].
has thickness description: To 25m
has upper boundary definition: Channelled erosional, unconformable contact with overlying limestone-rich gravel of the Limekiln Gill Gravel Formation or planar subhorizontal, unconformable contact with dark grey stony sandy silty clay diamicton of the Blackhall Till Formation.

Cromerian Complex Interglacial 2 To Elsterian Deposits, Undifferentiated (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CEDU
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BL
has lithology component: CEDU SED
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Elsterian.

Cefn Einion Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CEF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
has lithology component: CEF MDST
has lithology component: CEF SDST
has lithology component: CEF SLST
has source info: CEF_48905
has source info: CEF_50860
has source info: CEF_51580
has source info: CEF_52218
has obsolete equivalent: CEF mn 2408
has obsolete equivalent: CEF mn 1212
has obsolete equivalent: CEF mn 4571
broader: NP

Cement Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: CEFY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CY
broader: PGP
has geographical distribution: Central Coalfield area, Midland Valley of Scotland.

Cefn Coch Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CEG
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43346
has lithology component: CEG SDST
has source info: CEG_52252
has source info: CEG_52536
has obsolete equivalent: CEG mn 837
has obsolete equivalent: CEG mn 2816
broader: Gamlan Formation
has lower boundary definition: Conformable within the silty mudstones that form the main part of the Gamlan Formation.
has geographical distribution: Harlech area, North Wales.
has lithology description: Coarse-grained, quartzose, thick-bedded turbiditic sandstones.
has thickness description: Up to 15m
has upper boundary definition: Conformable within the upper part of the Gamlan Formation, but may locally form the top of the latter at its junction with the overlying flaggy sandstones and mudstones of the Mawddach Group.

Central Highland Migmatite Complex
type: Concept
in scheme: NamedRockUnit
alternative label: CEHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CEHI GNSS
has lithology component: CEHI PSAMG
has lithology component: CEHI PSAMI
has lithology component: CEHI PSAMM
has lithology component: CEHI PSFGM
has lithology component: CEHI PSQGM
has lithology component: CEHI QZFG
has lithology component: CEHI QZITE
has lithology component: CEHI SEMPEL
has lithology component: CEHI SPELGN
has source info: CEHI_51837
has obsolete equivalent: CEHI mn 852
has obsolete equivalent: CEHI mn 853
is obsolete equivalent of: CEHI DAVA
broader: NE
narrower: Dava Succession

Cwm Eigiau Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CEi
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OY
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43347
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43348
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43349
has lithology component: CEI CONG
has lithology component: CEI SDST
has lithology component: CEI SLMDST
has lithology component: CEI SLST
has lithology component: CEI TUF
has lithology component: CEI TUFT
has source info: CEI_49435
has source info: CEI_50274
has source info: CEI_51267
has source info: CEI_52649
has obsolete equivalent: CEI mn 799
has obsolete equivalent: CEI mn 1428
broader: OGW
narrower: MOH
narrower: Clogwyn Gottal Tuff
narrower: PSA
has additional age information: Late Soudleyan to Longvillian
has lower boundary definition: Conformably overlies the rhyolitic ash-flow tuffs of the Capel Curig Volcanic Formation (Llewelyn Volcanic Group) or, where the latter are not present, it overlies mudstones of the Nant Ffrancon Subgroup.
has geographical distribution: Not yet provided.
has lithology description: Sandstones with siltstones and silty mudstones, tuffs and tuffites.
has thickness description: 450 - 1300m
has upper boundary definition: Overlain by ash-flow tuffs of the Lower Rhyolitic Tuff Formation (Snowdon Volcanic Group) and (on the Lleyn Peninsular) the Allt Fawr Rhyolitic Tuff Formation.

Cwm Eigiau Formation And Lower, Middle And Upper Crafnant Formations (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CEICV
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OY
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OS
has lithology component: CEICV CONG
has lithology component: CEICV MDST
has lithology component: CEICV SDST
has lithology component: CEICV SLMDST
has lithology component: CEICV SLST
has lithology component: CEICV TUF
has lithology component: CEICV TUFT
broader: NA

Cowdenbeath Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CELL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CELL COAL
broader: NE

Cromerian Complex Interglacial 2 To Elsterian Mud And Sand, Interbedded (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CEMAS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BL
has lithology component: CEMAS MUD
has lithology component: CEMAS MUDM
has lithology component: CEMAS S
has lithology component: CEMAS SND
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Elsterian.

Carnbroe Marine Band (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: CEMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CEMB SHMDST
broader: MCMS

Cemetery Coal (Burnley)
type: Concept
in scheme: NamedRockUnit
alternative label: CEMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CEMC COAL
broader: PLCM

Cefnyrhendy Oolite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CEO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43350
has lithology component: CEO LMOOL
has source info: CEO_48717
has source info: CEO_52830
broader: Cornelly Oolite Formation
has lower boundary definition: Gradational junction with the underlying skeletal, peloidal and oolitic packstone/grainstones of the underlying High Tor Limestone Formation. Base taken at incoming of a predominantly oolitic grainstone sequence.
has geographical distribution: Northern part of the Vale of Glamorgan [ST 00 74]. Passes southwards into upper part of High Tor Limestone Formation. Relationship to coeval Goblin Oolite Formation in the Bristol Mendip [ST 50 65] area, unknown.
has lithology description: Massive to thick-bedded, locally cross-bedded ooid grainstones. Palaeokarstic surface at the top. Locally overlain by a thin clay palaeosol. Dolomitized along the southeast crop of the South Wales Coalfield. Interpreted to have been deposited in a barrier environment.
has thickness description: 13m in the northern Vale of Glamorgan, thickening southwards to 40m in the central part of the Vale of Glamorgan.
has upper boundary definition: Taken at top of the clay palaeosol capping the Formation, or the top of the underlying palaeokarstic surface if the clay is absent. The palaeosol/palaeokarst is sharply overlain by a bed of grey calcareous mudstone, overlain by thin- to medium-bedded, fine- to coarse-grained crinoidal skeletal packstones of the Argoed Limestone Member of the Cornelly Oolite Formation.

Capledrae Parrot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CEPA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: CEPA COAL
broader: ULGS

Cwm Eigiau Formation And Pen-Ychain Rhyolitic Complex (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CEPC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CEPC CONG
has lithology component: CEPC MDST
has lithology component: CEPC RY
has lithology component: CEPC RYTUF
has lithology component: CEPC SDST
has lithology component: CEPC SLMDST
has lithology component: CEPC SLST
broader: NP
has lithology description: See the Lithology descriptions for the component units.

Cephalopod Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CEPH
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Cephalopod Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CEPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CEPL LMST
broader: WLO

Cerig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CER
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cer
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43351
has lithology component: CER MDST
has lithology component: CER SDST
has source info: CER_49959
has obsolete equivalent: CER mn 3192
has obsolete equivalent: CER mn 4105
has obsolete equivalent: CER mn 647
broader: NA
narrower: MWM
narrower: MWSA
narrower: TRES
narrower: Gorllwyn-Fach Member
has lower boundary definition: Either disconformable on earlier Llandovery or Ashgill or conformable with Henfryn Formation. In latter case junction is gradational but taken at the base of the first thick mudstone bed above the pebbly mudstones, conglomerates and sandstones of the Henfryn Formation.
has geographical distribution: Central Wales.
has lithology description: Grey to green mudstones with dark burrow mottles. Units of dark laminated hemipelagite common in lower half of formation in slope settings, rare to absent on shelf. Sparse thin sandstones. NOTE: At Llandovey (type area) it is underlain by either the Derwyddon Formation or the Wormwood Formation and overlain by the Gwernfelen Formation. In the Rhayader district it overlies the Henfryn Formation or rests disconformably on earlier Formations. It is overlain by either the Dolfawr Mudstones or the Builth Mudstones.
has thickness description: 15 - 480m
has upper boundary definition: Either at the base of the incoming of thinly interbedded laminated and burrowed mudstones of the Dolfawr Mudstones, or at the base of the incoming of pervasively laminated mudstones of the Builth Mudstones.

Cerdic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CERD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
broader: LI
narrower: PHLP

Ceres Thick Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CERES
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CERES COAL
broader: LSC

Coetmor Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CES
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Cefngarreg Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CESA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NP

Cromerian Complex Interglacial 2 To Elsterian Sand (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CESND
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BL
has lithology component: CESND S
has lithology component: CESND SND
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Elsterian.

Coire Eilde Tuffs
type: Concept
in scheme: NamedRockUnit
alternative label: CET
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Dalness Ignimbrite Member

Cethings Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CETS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has lithology component: CETS SDST
broader: PFLD

Ceunant Slates
type: Concept
in scheme: NamedRockUnit
alternative label: CEU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
broader: NE

Cumbrian Esk Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CEVY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43352
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43353
has lithology component: CEVY C
has lithology component: CEVY S
has lithology component: CEVY V
has lithology component: CEVY Z
has source info: CEVY_51754
has obsolete equivalent: CEVY ALF
has obsolete equivalent: CEVY mn 78
broader: Cumbria-Lancashire Catchments Subgroup
narrower: Cumbrian Esk Alluvium Member
has additional age information: Mainly Holocene (but terraces may extend from Lateglacial).
has lower boundary definition: Sharply erosional, unconformable on all older Quaternary deposits (particularly till) and bedrock.
has geographical distribution: 1:50k Sheet 37 Gosforth, south of Muncaster Fell.
has lithology description: Sands, gravels, silts and clays forming river terraces and underlying floodplains of the Cumbrian Esk catchment.
has thickness description: 11.58m thick at Partial Type Section, but probably typically 5-10m thick in the type area.
has upper boundary definition: The ground surface, or overlain by peat of the Blelhem Peat Formation, or overlain by blown sand of the Drigg Point Sand Formation.

Cefn Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43354
has lithology component: CF COAL
has lithology component: CF MDST
has lithology component: CF SDST
has source info: CF_50795
broader: PMCM
has lower boundary definition: A sharp contact with underlying measures of the Pennine Middle Coal Measures Formation, which overlies an unnamed coal in its type area.
has geographical distribution: Denbighshire Coalfield (SJ 30 50).
has lithology description: Massive, quartzose sandstone with subordinate and impersistent beds of mudstone and coal.
has thickness description: Up to 37 m thick.
has upper boundary definition: Contact with overlying measures of Pennine Middle Coal Measures Formation.

Chillesford Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CFB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CFS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QS
has predominant age: QS
has youngest age: QS
has lithology component: CFB CLAY
has lithology component: CFB SANDU
has lateral equivalent: CFB st 183
has obsolete equivalent: CFB mn 906
broader: NCG
has lithology description: Sand, fine- to medium-grained, with clay drapes; ripple-laminated. [Generic description: academic papers and BGS Memoirs].

Caerfai Bay Shales Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43355
has lithology component: CFBS MDST
has lithology component: CFBS SLST
has lithology component: CFBS TUF
has source info: CFBS_49265
has source info: CFBS_49829
has source info: CFBS_50241
has source info: CFBS_50852
has source info: CFBS_50873
broader: Caerfai Group
has lower boundary definition: Conformably overlies the St Non's Sandstone Formation.
has geographical distribution: 1:50,000 Sheet 209 (St Davids) and adjacent Sheet 210, Pembrokeshire.
has lithology description: Purplish red mudstones with some siltstone beds and laminae, cross-bedded in lower part and with units of crystal tuff in the upper part.
has thickness description: 15m
has upper boundary definition: Passes upwards conformably by increase in grain size into the Caerbwdy Sandstone Formation.

Chillesford Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CFC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QS
has predominant age: QS
has youngest age: QS
has lithology component: CFC CLAY
has lithology component: CFC SANDU
has lithology component: CFC SILT
has obsolete equivalent: CFC mn 907
broader: NCG
has lithology description: Clay, pale- to medium-grey, with scattered laminae of silt or fine-grained sand. [Generic description: academic papers and BGS memoirs].

Chapelhall Lower Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: CFCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43356
has lithology component: CFCL COAL
has source info: CFCL_50439
broader: NE
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Coal - 1"; Fireclay - 6' 3"; Fireclay fakey - 6"; Fireclay dark, - 4". Total 7' 2".
has thickness description: 7'1" Lateral variations 2.1 metres.
has upper boundary definition: Conformable.

Carrock Fell Complex
type: Concept
in scheme: NamedRockUnit
alternative label: CFCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43357
has lithology component: CFCO GB
has lithology component: CFCO MCDI
has lithology component: CFCO MCGB
has lithology component: CFCO MCGN
has lithology component: CFCO RY
has source info: CFCO_50125
has source info: CFCO_51155
has source info: CFCO_52447
has source info: CFCO_52736
broader: LDMP
narrower: Carrock Gabbro-Microgranite Intrusions
narrower: Harestones Rhyolite
narrower: Iron Crag Microgranite
narrower: Mosedale Gabbros
has lower boundary definition: Not defined.
has geographical distribution: Carrock Fell, Cumbria.
has lithology description: Layered cumulate gabbros and quartz-gabbros, forming the Mosedale Intrusions which have a calc-alkaline/transitional to tholeiitic composition, microgabbro, microgranite with apatite-bearing iron-rich microdiorite, micromonzodiorite and microgranite zones forming the tholeiitic Carrock Intrusions, quartz-phyric rhyolite of the Harestones Rhyolite, and a microgranite named the Iron Crag Microgranite. Several component intrusions have Ordocician radiometric ages (Mosedale Gabbros, Carrock intrusions).
has thickness description: A near-vertical, sheet-like mass of about 8.5 sq. km emplaced at the junction between the Skiddaw Group and the Eycott Volcanic Group.
has upper boundary definition: Not defined.

Carrock Gabbro-Microgranite Intrusions
type: Concept
in scheme: NamedRockUnit
alternative label: CFCOC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43358
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43359
has lithology component: CFCOC GB
has lithology component: CFCOC MCDI
has lithology component: CFCOC MCGB
has lithology component: CFCOC MCGN
has lithology component: CFCOC MCMZDI
has source info: CFCOC_48986
has source info: CFCOC_49548
has source info: CFCOC_49572
has source info: CFCOC_50452
has source info: CFCOC_51155
has source info: CFCOC_52736
has obsolete equivalent: CFCOC mn 806
has obsolete equivalent: CFCOC mn 807
has obsolete equivalent: CFCOC mn 803
has obsolete equivalent: CFCOC mn 805
broader: Carrock Fell Complex
has lower boundary definition: Not defined.
has geographical distribution: Carrock Fell, Cumbria.
has lithology description: A microgabbro, cutting the main mass of micrographic microgranite, a narrow marginal zone of apatite-bearing, iron-rich gabbro, microdiorite, micromonzodiorite and microgranite. Radiometric age: microgranite 452.4 +/- 4.1 Ma (U-Pb, zircon) (Millward, D and Evans, J A, 2003.)
has thickness description: A near-vertical sheet like mass emplaced with the Carrock Fell Complex.
has upper boundary definition: Not defined.

Harestones Rhyolite
type: Concept
in scheme: NamedRockUnit
alternative label: CFCOH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43360
has lithology component: CFCOH RY
has source info: CFCOH_48988
has source info: CFCOH_49423
has source info: CFCOH_50125
has obsolete equivalent: CFCOH mn 1925
has obsolete equivalent: CFCOH mn 1926
broader: Carrock Fell Complex
has lower boundary definition: Not defined.
has geographical distribution: Carrock Fell, Cumbria.
has lithology description: A quartz-phyric rhyolite. Radiometric age: 419 +/- 4 Ma (Rb-Sr, whole rock) (Rundle, 1979); considered by many authors including Millward (2002) to have been re-set.
has thickness description: A near-vertical mass emplaced within the Drygill Shale Formation at the northern margin of the Carrock Fell Complex.
has upper boundary definition: Not defined.

Iron Crag Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: CFCOI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43361
has lithology component: CFCOI MCGN
has source info: CFCOI_50125
has source info: CFCOI_52459
has obsolete equivalent: CFCOI mn 2116
broader: Carrock Fell Complex
has lower boundary definition: Not defined.
has geographical distribution: Carrock Fell, Cumbria.
has lithology description: Feldspar-phyric, micrographic microgranite.
has thickness description: A near-vertical sheet, emplaced along the Roughton Gill Fault, at the western margin of the Carrock Fell Complex.
has upper boundary definition: Not defined.

Mosedale Gabbros
type: Concept
in scheme: NamedRockUnit
alternative label: CFCOM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43362
has lithology component: CFCOM GB
has lithology component: CFCOM QGB
has source info: CFCOM_48988
has source info: CFCOM_49548
has source info: CFCOM_50125
has source info: CFCOM_50130
has source info: CFCOM_51033
has source info: CFCOM_52043
has source info: CFCOM_52736
has obsolete equivalent: CFCOM mn 804
broader: Carrock Fell Complex
has lower boundary definition: Not defined.
has geographical distribution: Carrock Fell, Cumbria.
has lithology description: Layered cumulate gabbros, with zones rich in xenoliths a zone of poikilitic leucogabbro, gabbro and hypersthene gabbro, cut by biotite quartz-gabbro. Radiometric age 468 +/- 9 Ma (K-Ar whole rock) (Rundle, 1979). Geochemically similar to the Eycott Volcanic Group, with which it is considered to be associated (Hunter, 1980).
has thickness description: A near-vertical sheet-like mass, emplaced at the junction between the Skiddaw Group and the Eycott Volcanic Group.
has upper boundary definition: Not defined.

Chapelhall Upper Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: CFCU
has current status: CURRENT
has theme: BEDRCK
notation: CFCU
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Channel-Fill Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: CFD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CFD CLAY
has lithology component: CFD GRAV
has lithology component: CFD SANDU
has lithology component: CFD SILT
broader: NE
has lithology description: Sand and gravel, with silt and clay; infill of pre-existing channel. [Generic description: 1:50 k map margins].

Chalfield Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFDO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ChO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43364
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43363
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43365
has lithology component: CFDO LMOOL
has lithology component: CFDO LMPIS
has lithology component: CFDO LMST
has source info: CFDO_48979
has source info: CFDO_49880
has source info: CFDO_50034
has source info: CFDO_50111
has source info: CFDO_50112
has source info: CFDO_50600
has source info: CFDO_50901
has source info: CFDO_51206
has source info: CFDO_51775
has source info: CFDO_51870
has obsolete equivalent: CFDO mn 1823
has obsolete equivalent: CFDO mn 1824
has obsolete equivalent: CFDO mn 1821
broader: Great Oolite Group
has lower boundary definition: South of Badminton [ST 78 83] the base is a sharp upward change from grey calcareous silicate mudstone with subordinate argillaceous limestone beds of the Fuller's Earth Formation into ooid-limestone or coarse-grained shelly ooidal limestone ("Grickstone Beds"), locally with limestone pebbles. North of Badminton, the base rests sharply on fine-grained ooid-limestone of the Athelstan Oolite Formation, which is commonly capped by a hardground (separated on sheet 251 (1970 edition) and known as "chinastone" or "Coppice Limestone" (Cave, 1977)), or locally where that formation is absent, on the underlying fine-grained slightly argillaceous limestone of the Tresham Rock Formation.
has geographical distribution: Outcrop: Wellow, 7km southwest of Bath, where the Chalfield Oolite passes laterally into the Frome Clay, northeast to Kemble, Gloucestershire, where it passes into the Signet Member (White Limestone Formation). The formation thins progressively and substantially northeast of Badminton, mainly due to erosion of the upper beds beneath the Forest Marble Formation, but also possibly through lateral passage into the Athelstan Oolite Formation. Subcrop: might be present at depth in the Weald (Wyatt and Cave, 2002).
has lithology description: Ooidal grainstone, predominantly pale grey and pale yellow to white fine- to coarse-grained, with variable bioclastic content, in medium to thick beds; cross-bedded in parts; bioturbated in parts. A median unit of pisoidal, bioclastic limestone (Twinhoe Member) is developed south of Corsham. The generally moderately bioclastic ooid-limestones below (Combe Down Oolite Member) are fine- to coarse-grained, and those above (Bath Oolite Member) are medium- to coarse-grained ooid-limestones. Where the Twinhoe Member is not recognisable, the Combe Down and Bath Oolite members might not be distinguishable. The uppermost beds of the formation include lenticular masses of coralliferous limestone (?Corsham Member). The basal beds from Tormarton north to Hawkesbury Upton comprise a unit of coarse-grained shelly ooidal limestone ("Grickstone Beds"). These resemble the basal limestone of the Forest Marble Formation and north of Little Badminton where the overlying Combe Down Oolite beds are absent they cannot be reliably distinguished. From Westonbirt northeast to Kemble the formation comprises pale bioclastic ooid-limestone, and the strata cannot be assigned to members, apart from, locally, the Corsham Member.
has thickness description: 25 to perhaps 36m in the type area, thins northwards to less than 2m at Kemble. 35.2m in the Biddestone Borehole.
has upper boundary definition: A non-sequence, taken above the highest pale coloured generally moderately bioclastic ooid-grainstone, either erosive or marked by a bored and/or oyster-encrusted hardground, overlain by grey or brown variably sandy bioclastic limestone, variously ooidal or shelly, or locally by calcareous silicate-mudstone (all of the Forest Marble Formation).

Cnoc An Fhithich Banded Semipelite Formation And Drumchastle Pale Limestone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CFDR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CFDR DOLO
has lithology component: CFDR LMST
has lithology component: CFDR MDOLO
has lithology component: CFDR PEL
has lithology component: CFDR PSAMI
has lithology component: CFDR PSAMM
has lithology component: CFDR SEMPEL
broader: Blair Atholl Subgroup

Craig-Y-Ffynnon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OO
has predominant age: OO
has youngest age: OO
broader: Aran Volcanic Group

Canonbie Five Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CFFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CFFC COAL
broader: MCMS

Chilfall Zoophycus Flint
type: Concept
in scheme: NamedRockUnit
alternative label: CFFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Clintsfield Grit
type: Concept
in scheme: NamedRockUnit
alternative label: CFG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CFG COAL
has lithology component: CFG SDST
broader: SILS
has lithology description: Feldspathic sandstone, locally flaggy, with several thin coal seams.
has thickness description: c.14m

Cefn Hir Member
type: Concept
in scheme: NamedRockUnit
alternative label: CFH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cfn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: OE
has youngest age: OE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43366
has lithology component: CFH BALVPW
has lithology component: CFH FTUFF
has lithology component: CFH MDST
has lithology component: CFH MFTUF
has lithology component: CFH TUFT
has source info: CFH_49164
has source info: CFH_49912
has source info: CFH_51180
has source info: CFH_51886
has obsolete equivalent: CFH mn 838
broader: Cregennen Formation
has lower boundary definition: Conformable within the mudstones of the Cregennen Formation.
has geographical distribution: Cadair Idris district.
has lithology description: Mafic and felsic tuffs and tuffites with interbedded mudstones and rare pillowed basalts.
has thickness description: To 90m
has upper boundary definition: Conformable within the mudstones of the Cregennen Formation and locally overlain conformably by the mafic lavas and tuffs of the Llyn y Gafr Volcanic Formation.

Cribbwr Fach Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CFHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CFHC COAL
has lateral equivalent: CFHC st 348
broader: SWLCM

California Clayband Ironstones
type: Concept
in scheme: NamedRockUnit
alternative label: CFI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CFI FEST
broader: Black Metals Member

Common Flat Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: CFL LMST
has source info: CFL_51867
broader: LYN
has geographical distribution: Locally developed in the Bewcastle district, Cumbria.
has supplementary information: Uppermost limestone in the Lynebank Member of this area.

Clintsfield Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CFLD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CFLD COAL
broader: SILS

Cefn Mawr Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43367
has lithology component: CFML CHRT
has lithology component: CFML LMST
has lithology component: CFML MDST
has lithology component: CFML SDST
has source info: CFML_50738
has source info: CFML_50795
has source info: CFML_51187
has source info: CFML_51198
has source info: CFML_52033
has source info: CFML_52509
has lateral equivalent: CFML st 848
has lateral equivalent: CFML st 850
has obsolete equivalent: CFML mn 445
has obsolete equivalent: CFML mn 446
has obsolete equivalent: CFML mn 1200
has obsolete equivalent: CFML mn 4249
has obsolete equivalent: CFML mn 4237
has obsolete equivalent: CFML mn 4388
broader: Clwyd Limestone Group
narrower: MSHA
narrower: Coral Bed
narrower: Craig Rofft Sandstone Member
has lower boundary definition: Upper palaeokarstic surface/palaeosol of the Loggerheads Limestone Formation; base of lowest sequence of thinly interbedded, dark grey limestone and mudstones of the Cefn Mawr Limestone Formation.
has geographical distribution: Crops out on Anglesey [SH5080] and the Great Orme [SH7483] (Llandudno) in northwest Wales, in its type area to the east of the Clwydian Range [SJ2063], and at Llangollen [SJ2345] and near Oswestry [SJ2825] in northeast Wales. Also in the Corwen Outlier [SJ0543].
has lithology description: Thinly interbedded dark grey argillaceous limestones (wackestones and packstones) and mudstones with intercalated thick-bedded to massive, pale shelly limestones (packstones and grainstones) and lenticular, cross-bedded, coarsely crinoidal limestone (rudstone) bodies. Lithologies are arranged in cyclic sequences. Limestones at the top of each cycle commonly display calcrete and palaeokarstic features locally overlain by bentonitic clay palaeosols. Thin chert beds and nodules in upper part; rare sandstone beds. The Cefn Mawr Limestone Formation records principally Brigantian platform carbonate deposition on the North Wales Dinantian shelf. Each cyclic sequence records a shoaling upwards unit developed in response to transgressive and regressive movements in sea level. Many regressions culminated in emergence of the platform surface and formation of calcrete and karstic dissolution features. The sequences of thinly interbedded dark grey limestone and mudstone, diagnostic of the Formation, record deposition during marine transgressions, which repeatedly established deeper platformal conditions than ever prevailed during deposition of the preceding and similarly cyclic Loggerheads Limestone Formation.
has thickness description: 40 to 275m
has upper boundary definition: Where overlain by the Minera Formation, the top is taken at the base of the lowest sandstone within the latter; where overlain by the Pentre Chert Formation, the top is taken at the disconformable base of the latter.

Cefn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Clee Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ClF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has lithology component: CFO SDST
has lithology component: CFO SLST
has source info: CFO_50414
has source info: CFO_50426
has source info: CFO_50617
has source info: CFO_52293
has lateral equivalent: CFO st 151
has obsolete equivalent: CFO mn 947
has obsolete equivalent: CFO mn 948
broader: WBK
has additional age information: Originally described as "Lower Devonian, Breconian". Emsian is given here as the closest approximation to the term "Breconian".

Colla Firth Permeation And Injection Belt
type: Concept
in scheme: NamedRockUnit
alternative label: CFPI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CFPI GNGNS
has lithology component: CFPI MLMST
has lithology component: CFPI PELGN
broader: NE

Carn Fadryn Quartz Microdiorite
type: Concept
in scheme: NamedRockUnit
alternative label: CFQM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CFQM MCQDI
has source info: CFQM_50909
broader: Carn Fadryn Suite
has lower boundary definition: Not applicable.
has geographical distribution: Not specified.
has lithology description: Quartz microdiorite with quartz and plagioclase phenocrysts, apatite and zircon, in a fine-grained highly altered groundmass.
has thickness description: Unknown.
has upper boundary definition: Not applicable.

Cribbwr Fawr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CFRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CFRC COAL
has lateral equivalent: CFRC st 349
broader: SWLCM

Chwefri Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFRI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NA
narrower: YSTW

Cefn-Y-Fedw Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43368
has lithology component: CFS CALSST
has lithology component: CFS CHRT
has lithology component: CFS COAL
has lithology component: CFS CONG
has lithology component: CFS LMST
has lithology component: CFS MDST
has lithology component: CFS PESST
has lithology component: CFS SDST
has lithology component: CFS SLST
has source info: CFS_48748
has source info: CFS_48807
has source info: CFS_48808
has source info: CFS_49377
has source info: CFS_50795
has source info: CFS_51187
has source info: CFS_52357
has obsolete equivalent: CFS mn 840
has obsolete equivalent: CFS DBS
has obsolete equivalent: CFS mn 2901
has obsolete equivalent: CFS mn 2903
has obsolete equivalent: CFS mn 839
has obsolete equivalent: CFS mn 841
has obsolete equivalent: CFS mn 1898
broader: NP
narrower: SWMS
narrower: Dee Bridge Sandstone
has additional age information: ?Brigantian to Marsdenian
has lower boundary definition: Drawn at base of sandstone and conglomerate of Cefn-y-Fedw Sandstone Formation where it rests conformably on sandy limestone of the Minera Formation or Cefn Mawr Limestone Formation. Intertongues on Halkyn Mountain with Pentre Chert Formation.
has geographical distribution: Northeast Wales between Halkyn Mountain [SJ2270] and Oswestry [SJ2826]. Three sandstone leaves, interpreted to belong to the Cefn-y-fedw Formation, are proved in the Blacon East No.1 Borehole (SJ36NE/23).
has lithology description: White and pale grey, fine- to medium-grained, planar- and cross-bedded, quartzose sandstones, pebbly sandstones and thin beds of quartz conglomerate; with units of calcareous sandstone, sandy limestone, chert and siliceous mudstones in lower part; locally thick beds of siltstone and mudstone, and thin, impersistent coal seams. Lithologies are commonly arranged in coarsening upwards cycles. The Formation records fluviodeltaic deposition across the former North Wales Dinantian platform. The cyclic arrangement of lithologies represent progradational sequences formed in response to contemporary movements in marine base level. The sandstones and conglomerates record the advance of delta distributary channels and mouth bars across finer pro-delta and interdistributary mud and silt facies.
has thickness description: To 585m
has upper boundary definition: Highly diachronous, but taken at conformable contacts between sandstone of the Cefn-y-Fedw Sandstone Formation and mudstones of the Bowland Shale Formation. However, the two formations exhibit complex intertonguing.

Crayford Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: CFSI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QI
has predominant age: QI
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43369
has lithogenesis: AEOLD
has lithogenesis: FLUV
has lithology component: CFSI C
has lithology component: CFSI CZ
has lithology component: CFSI S
has lithology component: CFSI Z
has lithology component: CFSI ZC
has source info: CFSI_49728
has source info: CFSI_50801
has source info: CFSI_52673
has obsolete equivalent: CFSI mn 1116
has obsolete equivalent: CFSI mn 1118
has obsolete equivalent: CFSI mn 1117
broader: MNHD
has lower boundary definition: Overlies Interglacial gravel and sand
has geographical distribution: Crayford, and Cray and Darent valleys.
has lithogenesis description: A typical "brickearth" type deposit.
has lithology description: Generically it varies from silt to clay, commonly yellow-brown. Origin uncertain. Commonly includes a high percentage of wind-blown, silt-sized quartz (possibly loess). Locally represented bt yellow to buff sand with shells at base passing up through brown, bedded sand with sandy silt to grey clay and shelly sand at the top.
has thickness description: 2.4m (average)
has upper boundary definition: At surface or overlain by floodplain gravel

Camp Fauld Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43370
has lithology component: CFTI C
has lithology component: CFTI S
has lithology component: CFTI V
has source info: CFTI_50626
has source info: CFTI_50918
has source info: CFTI_51669
has lateral equivalent: CFTI st 212
broader: Banffshire Coast And Caithness (Albion) Glacigenic Subgroup
has additional age information: ?Wolstonian.
has lower boundary definition: The unit rests on, and locally grades down into, and incorporates rafts of glauconitic Moreseat Sandstone Formation (Lower Cretaceous).
has geographical distribution: Moss of Cruden, Buchan.
has lithology description: Sandy, silty diamicton (till), very stiff, grey (2.5Y N5) to very dark grey (7.5YR N3), massive to crudely horizontally bedded with sparse pebbles. Clast lithologies comprise mainly rounded quartzite and flint, with lesser amounts of subangular grey granite, mafic igneous, red sandstone and soft grey siltstone. The matrix is a micaceous sandy silt and clay; clay mineralogy is largely kaolinite, illite-smectite and minor glauconite.
has thickness description: At least 2m
has upper boundary definition: Sharp, unconformable contact with compressed humified peat and organic sand of the Berry Peat Bed, where the upper part of the till is mottled (weathered).

Confusion Member
type: Concept
in scheme: NamedRockUnit
alternative label: CFU
has current status: CURRENT
has theme: BEDRCK
notation: CFU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OP
has predominant age: OP
has youngest age: OP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43371
has lithology component: CFU SDST
has lithology component: CFU SLST
has source info: CFU_50964
broader: SLH
has lower boundary definition: Rests on the Myoch Formation in Penwhapple Burn. The base of the Confusion Member (= base of Shalloch Formation) is there marked by the upward change from red and green mudstone to sandstone/siltstone flysch.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Grey flaggy greywacke sandstone and siltstone flysch.
has thickness description: c.42m
has upper boundary definition: Succeeded by a 1.1m leaden-grey mudstone bed that marks the base of the Shalloch Formation at the coast, where this mudstone rests directly on the Mill Formation. The Confusion Member is therefore the lateral equivalent of the Mill Formation at the coast, but of different (Shalloch type) facies.

Cnoc Fyrish Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CFY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: CFY CONG
has lithology component: CFY SDST
has obsolete equivalent: CFY mn 980
broader: NE

Clypeus Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SaL
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43374
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43372
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43373
has lithology component: CG LMST
has source info: CG_48756
has source info: CG_48916
has source info: CG_49459
has source info: CG_49479
has source info: CG_50047
has source info: CG_50541
has source info: CG_50661
has source info: CG_50680
has source info: CG_50779
has source info: CG_51045
has source info: CG_51129
has source info: CG_51271
has source info: CG_51566
has source info: CG_51751
has source info: CG_52847
has source info: CG_52963
has obsolete equivalent: CG mn 977
has obsolete equivalent: CG mn 976
has obsolete equivalent: CG mn 3305
has obsolete equivalent: CG mn 3670
broader: SALS
has additional age information: Parkinsoni Zone to Zigzag Zone.
has lower boundary definition: Upward change from shelly coarsely shell-fragmental limestone (Upper Trigonia Grit Member), to limestone as described under Lithology. Commonly a non-sequence, marked by a hardground, though locally appears to be transitional. Where Upper Trigonia Grit Member absent, boundary is hardground capping Aston Limestone or Birdlip Limestone formations, or unconformity on older beds.
has geographical distribution: Horton, northeast Avon (Green, G W, 1992; see also Barron, A J M, et al, 1997, p.281, figs. 4 and 5), through Gloucestershire Cotswolds to north Oxfordshire west of a line from Hook Norton to Tackley where overlapped by Great Oolite Group (Horton, A, Poole, E G, Williams, B J, Illing, V C and Hobson, G D, 1987, fig.26).
has lithology description: Pale grey to pinkish brown fine- to coarse-grained ooidal, peloidal and shell-detrital packstone to grainstone, with large orange-skinned peloids/pisoids and aggregate grains; common whole shells especially in upper part. Characteristic fauna includes the large echinoid Clypeus ploti Salter, large myacean bivalves and terebratulid brachiopods (Stiphrothyris). From Stroud southwards, includes coral-rich limestone ('Upper Coral Bed') at base.
has thickness description: Typically 10 to 12m. Type section 10.5 to 12m. Maximum c.16m (Colesbourne area).
has upper boundary definition: Upward change to mudstone (Fuller's Earth Formation) in southwest or into fine- to medium-grained ooidal grainstone (Chipping Norton Limestone Formation) in northeast. Generally transitional, but locally marked by a hardground (Sumbler, M G, Barron, A J M and Morigi, A N, 2000).

Creg Agheash Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43375
has lithology component: CGA MDST
has lithology component: CGA SDST
has lithology component: CGA SLST
has source info: CGA_50459
has source info: CGA_50554
has source info: CGA_51128
has source info: CGA_51179
has source info: CGA_52552
has obsolete equivalent: CGA mn 52
has obsolete equivalent: CGA mn 2786
broader: MANX
has lower boundary definition: Stratigraphical with the Lonan Formation.
has geographical distribution: Isle of Man.
has lithology description: Sandstone [quartz arenite], pale grey, thin to thick-bedded with interbedded laminated mudstone and siltstone.
has thickness description: Up to 750 m thick.
has upper boundary definition: Stratigraphical with the Maughold Formation.

Central Grampian (Albion) Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CGAG
has current status: CURRENT
has theme: SPRFCL
notation: CGA
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43376
has lithology component: CGAG CLAY
has lithology component: CGAG DMTN
has lithology component: CGAG GRAV
has lithology component: CGAG SANDU
has lithology component: CGAG SILT
has source info: CGAG_50626
has source info: CGAG_51617
has obsolete equivalent: CGAG mn 849
broader: Albion Glacigenic Group
narrower: Ailleag Diamicton Formation
narrower: Boyne Craig Till Formation
has lower boundary definition: Unconformable contact with bedrock.
has geographical distribution: The Grampian Highlands bounded by the Great Glen and Moray Firth to the north, the Cairngorms and Gaick Plateau to the east, Strathmore to the south, and including the Inner Hebrides lying to the south of Mull.
has lithology description: Suite of glacial, glaciofluvial and glaciolacustrine deposits that contain clasts predominantly of micaceous psammite, mica schist, granite and granodiorite, including sandy diamictons (till), sand, gravel, silt and clay. Mainly deposited from ice that radiated away from an ice-divide centred over Rannoch Moor.
has thickness description: To 10m
has upper boundary definition: Unconformable contact with units of the Central Grampian Glacigenic Subgroup.

Carraig Artair Member
type: Concept
in scheme: NamedRockUnit
alternative label: CGAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Bonahaven (Bunnahabhain) Dolomite Formation

Carmill Gas Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CGAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: CGAS COAL
broader: NE

Craigs Breccias
type: Concept
in scheme: NamedRockUnit
alternative label: CGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Creag Buidhe Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGBH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43377
has lithology component: CGBH SPELGN
has source info: CGBH_48667
broader: Dava Succession
has lower boundary definition: Not exposed - interbanded with psammites of Dava Succession, undifferentiated.
has geographical distribution: Central Highlands of Scotland, SE of Loch Ness. Strathnairn to Slochd area.
has lithology description: Gneissose to migmatitic semipelite.
has upper boundary definition: Conformable contact with structurally overlying Flitchity Psammite - no way-up criteria.

Craig Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: CGC COAL
broader: ULGS

Creggan Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43378
has lithology component: CGCK CHLK
has lithology component: CGCK FLNT
has lithology component: CGCK LMST
has source info: CGCK_52106
has source info: CGCK_52212
has obsolete equivalent: CGCK mn 1127
broader: UWLF
has additional age information: Campanian. Lower part of Offaster pilula Zone.
has lower boundary definition: Point in the succession where there is a sudden increase in Inoceramus fragments. At Creggan this occurs 0.23m above the Oweynamuck Flint Band within the top of the Cloghastucan Chalk Formation.
has geographical distribution: North Antrim and East Antrim basins and the Southern Upland area. Oversteps onto the Highland border area and a limited northern part of the Londonderry Shelf.
has lithology description: Limestone (chalk), with common Inoceramus fragments (up to 20%) and many small burrow-fill flints scattered throughout. The upper part contains several green-coated pebble horizons that coalesce towards the basin margins to form a single conspicuous hardground with rolled and mineralised fossils most notably belemnites and echinoid steinkerns. Glauconitic in marginal overlap facies where the uppermost beds/surfaces are attenuated, gritty, glauconitic and algal-topped (stromatolitic).
has thickness description: 3.45 m at the type locality.
has upper boundary definition: Taken at the highest of several green-coated chalk pebble beds within the Inoceramus-rich limestone. This unit is termed the Bendoo Pebble Bed (of member? status) in the North Antrim Basin. Overlain by the Boheeshane Chalk Formation.

Congo Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: CGCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has lithology component: CGCL COAL
broader: MG

Cefn Glas Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CGCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CGCO COAL
broader: Hughes Member

Carghidown Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CGD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43379
has lithology component: CGD MDST
has lithology component: CGD WACKE
has source info: CGD_49823
has obsolete equivalent: CGD mn 787
broader: HWK
has lower boundary definition: 'Lower' (i.e. Northern boundary) - gradational from Kirkmaiden Formation.
has geographical distribution: Not defined.
has lithology description: Greywackes (beds dominantly less than 0.5 metres thick) with interbedded mudstones including some red mudstone beds. Includes few thicker massive arenite beds to east. Distinguished from 'underlying' Kirkmaiden Formation by presence of red mudstone beds. Distinguished from overlying Riccarton Group by presence of red mudstone beds and absence of dark grey finely laminated siltstone beds.
has thickness description: c 4000 metres section of vertical strata but some folding and locally intense faulting renders accurate assessment of stratigraphical thickness impossible.
has upper boundary definition: Upper - faulted contact with Riccarton Group at Burrow Head (NX 4528 3414).

Cul Nan Gad Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CGDI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: CGDI DIR
has lithology component: CGDI GD
has lithology component: CGDI QDI
has lithology component: CGDI TO
broader: SSCGR

Central Grampian Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CGDR
has current status: CURRENT
has theme: SPRFCL
notation: CG
has revision number: 4
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43380
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43381
has lithology component: CGDR CLAY
has lithology component: CGDR DMTN
has lithology component: CGDR GRAV
has lithology component: CGDR SANDU
has lithology component: CGDR SILT
has source info: CGDR_50626
has source info: CGDR_51577
has obsolete equivalent: CGDR mn 849
has obsolete equivalent: CGDR mn 850
broader: Caledonia Glacigenic Group
narrower: Beinn An Uain Till Formation
narrower: Ceardaich Sand And Gravel Formation
narrower: PATT
narrower: Carn Monadh Gravel Formation
narrower: LPSI
narrower: Gaick Plateau Moraine Formation
narrower: Ardverikie Till Formation
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: The Grampian Highlands as far as Strath Spey, the Cairngorm Mountains and Gaick Plateau to the east, including the Inner Hebrides to the south of Mull.
has lithology description: Diamictons, glaciofluvial sands and gravels and glaciolacustrine silts deposited by ice that (mainly) radiated out from a centre over Rannoch Moor. Clasts mainly derived from Central Highland Migmatite Complex and Caledonian igneous rocks.
has thickness description: Generally 5-10m, but locally 30m or more.
has upper boundary definition: Generally the ground surface.

Craiganee Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TA
broader: NE

Colwall Gelifluctate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGEL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: CG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43383
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43382
has lithology component: CGEL CLAY
has lithology component: CGEL SILT
has source info: CGEL_48753
has source info: CGEL_49319
broader: NE
has lower boundary definition: Placed at junction of Beds 6 and 7 in augerholes at Colwall, where stony clay of the Colwall Gelifluctate overlies sandy silt/clay of the Cradley Silts (Barclay, et al, 1992).
has geographical distribution: Cradley - Glynch Brook Valleys in Mathon - Colwall area, Herefordshire.
has lithology description: Stiff, mainly yellow-brown gravelly silty clay or clayey silt with angular clasts of local lithologies.
has thickness description: Up to c.2 metres.
has upper boundary definition: Not generally seen, but placed at junction with overlying younger solifluction or alluvial deposits.

Cwmcringlyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CgF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
broader: NP

Creag Nan Gall Granodiorite
type: Concept
in scheme: NamedRockUnit
alternative label: CGGD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: CGGD GD
broader: Abergeldie Pluton

Craigleith Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CGH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43384
has lithology component: CGH SDST
has source info: CGH_49223
has lateral equivalent: CGH st 375
broader: Gullane Formation
has lower boundary definition: Status uncertain, but likely to be erosive on underlying argillaceous and arenaceous rocks of the Gullane formation.
has geographical distribution: Only known for certain in the Edinburgh area.
has lithology description: An off-white, typically fine-grained, siliceous sandstone, often thickly bedded with trough cross-bedding, and a little mica or carbonaceous material, famous as a building stone.
has thickness description: Up to 105m thick, in the City of Edinburgh.
has upper boundary definition: Transitional by upward fining into non-marine siltstone and mudstone of the Gullane Formation, the Craigleith Marine Band lies a little further above.

Clogherny Member
type: Concept
in scheme: NamedRockUnit
alternative label: CGHY
has current status: CURRENT
has theme: BEDRCK
notation: CHM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43385
has lithology component: CGHY PSAMM
has lithology component: CGHY SCH
broader: Glenelly Formation
has lower boundary definition: Conformable with normal Glenelly Formation schist.
has geographical distribution: Glenelly, Co.Londonderry, Northern Ireland.
has lithology description: Off-white quartz mica schists and flaggy medium grained to gritty quartzose psammites.
has thickness description: c.40m
has upper boundary definition: Conformable with normal Glenelly Formation schist.

Cayton Gill Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CGI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CGI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43386
has lithology component: CGI CALSST
has lithology component: CGI CAMDST
has lithology component: CGI MDST
has lithology component: CGI SDST
has lithology component: CGI SLST
has source info: CGI_48939
has source info: CGI_49523
has source info: CGI_50066
has source info: CGI_50332
has source info: CGI_50486
has source info: CGI_50642
has source info: CGI_50839
has source info: CGI_51816
has source info: CGI_51877
has source info: CGI_52324
has source info: CGI_52498
has source info: CGI_52594
has obsolete equivalent: CGI mn 836
broader: Hebden Formation
has lower boundary definition: Sharp contact between sandstone bed at the base of the unit and the underlying siltstone.
has geographical distribution: Present in the Harrogate, Leeds, Masham and Pateley Bridge areas.
has lithology description: Silty mudstone, calcareous and siliceous, shelly with beds of siltstone and sandstone.
has thickness description: 3.54m in type section, 0 - 16m elsewhere
has upper boundary definition: Sharp contact between fossiliferous sandstone and the overlying mudstone.

Collin Glen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TR
broader: NE

Creag Liath Psammite
type: Concept
in scheme: NamedRockUnit
alternative label: CGLH
has current status: CURRENT
has theme: BEDRCK
notation: LI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43387
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43388
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43389
has lithology component: CGLH CALSIR
has lithology component: CGLH PSAMI
has lithology component: CGLH PSAMM
has lithology component: CGLH SEMPEL
broader: Glen Banchor Succession
narrower: Blargie Quartzite Member
has lower boundary definition: Typically a shear zone with structurally underlying striped semipelites of the An Stac Semipelite and Psammite.
has geographical distribution: Central Highlands of Scotland. Glen Banchor - Kincraig area.
has lithology description: Interbanded gneissose psammite, siliceous psammite with subordinate micaceous psammite and semipelite. Distinctive porphyroclasts of K-feldspar common.
has thickness description: 220 m +
has upper boundary definition: Unconformity / stratigraphical break with overlying Grampian and Appin Group rocks.

Crag Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CGLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CGLM LMST
has lithology component: CGLM MDST
has lateral equivalent: CGLM CROL
has lateral equivalent: CGLM OKL
broader: SMGP
has geographical distribution: Parts of North Yorkshire and Northumberland (Limedale, Teesdale, Weardale, East Allendale and westwards to West Allendale and the Alston district.
has lithology description: Dark grey, fine-grained limestone; might pass westwards into dark ferruginous shelly sandstone (Lexique Stratigraphique).
has thickness description: To c.2m

Conglass Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CGLS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43390
has lithology component: CGLS SDST
has lithology component: CGLS SLST
has source info: CGLS_50067
has source info: CGLS_52849
broader: TOMI
has lower boundary definition: Sedimentary junction with Raebeg Sandstone Formation, not exposed.
has geographical distribution: Immediately north-east of the Conglass Water in the north-east part of Tomintoul ORS outlier, upper Banffshire; a 50 km2 outlier, 15 x 5 km in extent, that is totally separated from; other ORS outcrops of the north-east Grampian area.
has lithology description: Sandstone, grey to greenish grey, massive to flaggy, few micaceous partings, cross-bedded, with beds of green siltstone. Siltstone also occurs as rip-up clasts in sandstone. Some channels with pebbly base.
has thickness description: ca 100m
has upper boundary definition: Not known, upper part of formation removed by erosion.

Craigleith Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CGLTH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: CGLTH TRBA
broader: LAFAS

Cambuslang Marble
type: Concept
in scheme: NamedRockUnit
alternative label: CGM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CGM LMST
broader: MCMS

Creag Meagaidh Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGMG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43391
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43392
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43393
has lithology component: CGMG CALSIR
has lithology component: CGMG PSAMI
has lithology component: CGMG PSAMM
has lithology component: CGMG PSMG
has lithology component: CGMG PSMGN
has lithology component: CGMG QZF
has lithology component: CGMG SEMPEL
has source info: CGMG_51263
has source info: CGMG_51925
broader: Corrieyairack Subgroup
has lower boundary definition: Sharply transitional - marked by incoming of flaggy psammites above semipelite-psammite interbeds of the Ardair Semipelite Formation.
has geographical distribution: Southern Monadhliath Mountains: Glen Roy - Laggan - Glen Banchor districts.
has lithology description: Flaggy to blocky feldspathic and micaceous psammites. Minor semipelite interbeds and calc-silicate rock lenses. Rare feldspathic quartzite.
has thickness description: 500m - 765m maximum.
has upper boundary definition: Sharply transitional into overlying fissile, schistose semipelites of the Clachaig Formation.

Cairngorm Granitic Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CGMGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Caledonian Supersuite
narrower: Bennachie Pluton
narrower: Cairngorm Pluton
narrower: MNDL
narrower: Cushnie Pluton
narrower: ORDF
narrower: KHGR
narrower: PTHD
narrower: Ballater Pluton
narrower: Hill Of Fare Intrusion
narrower: Cromar Pluton
narrower: Coilacreich Intrusion
narrower: MBAT
narrower: LOGR
narrower: STFG
narrower: Auldearn (Park) Pluton
narrower: Glen Gairn Pluton

Creag Mhor Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CGML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CGML MLMST
broader: Birchwood Semipelite Formation

Creag Nam Ban Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGNB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CGNB PEL
has lithology component: CGNB PSAMM
has lithology component: CGNB QZITE
has lithology component: CGNB SEMPEL
has source info: CGNB_49438
broader: Easdale Subgroup

Cairngorm Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM GN
has lithology component: CGOM GNL
broader: Cairngorm Granitic Suite
narrower: Cairngorm Pluton, Phase 1
narrower: Cairngorm Pluton, Phase 2
narrower: Cairngorm Pluton, Phase 3
narrower: Cairngorm Pluton, Phase 4
narrower: Cairngorm Pluton, Phase 5
narrower: Cairngorm Pluton, Phase 6

Cairngorm Pluton, Phase 1
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: Cairngorm Pluton

Cairngorm Pluton, Phase 2
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM2 GN
has lithology component: CGOM2 GNB
has lithology component: CGOM2 PEG
broader: Cairngorm Pluton

Cairngorm Pluton, Phase 3
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM3 GNL
broader: Cairngorm Pluton

Cairngorm Pluton, Phase 4
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM4
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM4 MCGNA
has lithology component: CGOM4 MCGNAP
broader: Cairngorm Pluton

Cairngorm Pluton, Phase 5
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM5
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM5 MCGNP
broader: Cairngorm Pluton

Cairngorm Pluton, Phase 6
type: Concept
in scheme: NamedRockUnit
alternative label: CGOM6
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CGOM6 GNP
broader: Cairngorm Pluton

Carn Gorm Pegmatite Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CGPEG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CGPEG PEG
broader: NE

Cairn Gibbs Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43397
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43396
has lithology component: CGPS MLAVA
has lithology component: CGPS MTUF
has lithology component: CGPS PEL
has lithology component: CGPS PSAMG
has lithology component: CGPS PSAMM
has lithology component: CGPS SEMPEL
has source info: CGPS_51786
has obsolete equivalent: CGPS mn 3922
broader: SOHI
has lower boundary definition: Boundary placed arbitrarily at base of thick green bed unit that separates the dominantly psammitic Cairn Gibbs Formation from the underlying more varied Mount Blair Formation.
has geographical distribution: Eastern boundary of Sheet 56W (Glen Shee) west to Strath Ardle.
has lithology description: Schistose psammite and gritty psammite with minor units of phyllitic to schistose pelite.
has thickness description: Not known.
has upper boundary definition: Not seen in Glen Shee district.

Carnedd Y Filiast Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CGr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43398
has lithology component: CGR PESST
has lithology component: CGR SDST
has source info: CGR_49435
has source info: CGR_49974
broader: MAF
has lower boundary definition: At base of sandstones forming top part of the Marchlyn Formation.
has geographical distribution: Northern Snowdonia.
has lithology description: Coarse-grained massive quartzose and pebbly sandstones.
has thickness description: 30-60m
has upper boundary definition: Unconformity at top of Marchlyn Formation.

Coastguard Station Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CGRD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: CGRD AGG
has lithology component: CGRD TUF
broader: SSDLO

Colgate Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KV
has predominant age: KV
has youngest age: KV
broader: NE

Cefn Gwyn Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: CGTU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43399
has lithology component: CGTU TUF
has source info: CGTU_49215
has source info: CGTU_50546
has source info: CGTU_51267
has lateral equivalent: CGTU st 240
has obsolete equivalent: CGTU st 175
has obsolete equivalent: CGTU st 240
broader: Ceiswyn Formation
has lower boundary definition: Conformable with silty mudstones and siltstones of the Ceiswyn Formation.
has geographical distribution: Bala and Corwen districts, North Wales.
has lithology description: Non-welded felsic ash-flow tuff.
has thickness description: 0 to 4m
has upper boundary definition: Conformable with the Ceiswyn Formation; immediately overlain by rocks of the Glyn Gower Siltstones Member.

Craig Cau Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43400
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43401
has lithology component: CGU FTUFF
has lithology component: CGU MDST
has lithology component: CGU RY
has lithology component: CGU TUFT
has source info: CGU_49165
has source info: CGU_49973
has source info: CGU_50284
has source info: CGU_50546
has source info: CGU_51180
has source info: CGU_51272
has source info: CGU_51627
has lateral equivalent: CGU AFM
has lateral equivalent: CGU st 499
has lateral equivalent: CGU PNF
has obsolete equivalent: CGU mn 1101
has obsolete equivalent: CGU mn 4326
has lateral equivalent: CGU st 223
has obsolete equivalent: CGU mn 1100
has obsolete equivalent: CGU mn 3287
broader: Aran Volcanic Group
has lower boundary definition: Conformably overlies and laterally inter-tongues with the Ty'r Gawen Mudstone Formation in the south and west of the Cadair Idris district, and conformably overlies crystal tuffs of the Benglog Formation in the northeast, where its base is less clearly defined.
has geographical distribution: Cadair Idris area, North Wales.
has lithology description: Felsic ash-flow tuffs interbedded with subordinate tuffites and mudstones in the lower part of the formation, but becoming massive and welded in the upper part. Associated intrusive and extrusive rhyolites.
has thickness description: 0 to 400m
has upper boundary definition: Conformably overlain by mudstones of the Ceiswyn Formation.

Chalky Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: CGV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CGV CHLK
has lithology component: CGV GRAV
broader: NE
has lithology description: Gravel, chalk-rich. [Generic description].

Cwm Gwaun Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OF
has predominant age: OF
has youngest age: OF
broader: NE
has additional age information: Arenig (Fennian).

Catgill Wood Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CGWD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43402
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43403
has lithology component: CGWD S
has lithology component: CGWD V
has source info: CGWD_49633
has source info: CGWD_49654
has source info: CGWD_51342
has obsolete equivalent: CGWD mn 2883
broader: SEAG
has additional age information: ?Late Devensian.
has lower boundary definition: Sharp erosional contact on diamictons of the Low Wath Till Member.
has geographical distribution: 1:50k sheets 37 Gosforth and 38 Whiteheaven, Western Cumbria.
has lithology description: Clast-supported, poorly sorted gravel with lenses of sand. Clasts are mainly subangular to rounded, up to cobble size and composed of red (Permo-Triassic) and yellow (Carboniferous) sandstones, and coal.
has thickness description: 1.2m thick at type section but up to 10m thick in boreholes around Egremont.
has upper boundary definition: At the type section conformably overlain by silt and clay of the Ehen Valley Silt Member of the Seascale Glacigenic Formation.

Craig-Y-Glyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CGYG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CgF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43405
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43404
has lithology component: CGYG ARLMST
has lithology component: CGYG CAMDST
has lithology component: CGYG TUFCA
has source info: CGYG_48748
has source info: CGYG_49882
has source info: CGYG_50077
has obsolete equivalent: CGYG mn 1103
broader: NP
has lower boundary definition: Not seen.
has geographical distribution: Limited to fault bounded inliers in the central Berwyn Hills, Lwrch inlier (137), Llwyn-Onn inlier (136) (ca SJ 073 264), Garwallt inlier (136) (ca SJ 091 281).
has lithology description: Calcareous mudstones. (Well stratified rhyolitic and calcareous ash, and pale blue bedded limestone; with calcareous shale and calcareous, blue mudstone and shale).
has thickness description: Greater than 300m in the Lwrch inlier.
has upper boundary definition: In faulted contact with mudstones of Llangynog Formation of Carodocian age.

Chalmerston Coal (Dalmellington, South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CH COAL
broader: MCMS

Chirdon No.1 Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CH1C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CH1C COAL
has lateral equivalent: CH1C st 571
broader: Border Group

Chirdon No.1 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CH1L
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CH1L LMST
broader: Border Group

Chirdon No.2 Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CH2C
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CH2C COAL
has lateral equivalent: CH2C st 570
broader: Border Group

Chirdon No.2 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CH2L
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CH2L LMST
has lateral equivalent: CH2L JPL
broader: Border Group

Charnian Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: CHA
has current status: CURRENT
has theme: BEDRCK
notation: CHA
has revision number: 2
has rock unit rank: SG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43406
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43407
has lithology component: CHA AND
has lithology component: CHA DA
has lithology component: CHA SDST
has lithology component: CHA TUF
has lithology component: CHA VCBR
has lithology component: CHA VCSLST
has lithology component: CHA VCSST
has source info: CHA_51833
has lateral equivalent: CHA st 893
broader: NA
narrower: Bardon Hill Volcanic Complex
narrower: Caldecote Volcanic Formation
narrower: Brand Group
narrower: Hanging Rocks Formation
narrower: Blackbrook Group
narrower: WVO
narrower: Maplewell Group
has lower boundary definition: Not seen.
has geographical distribution: Extends from Blackbrook (SK 452 185) south-eastwards to the Bradgate area of Charnwood Forest (SP 543 107), and thence beneath younger rocks south-westward to Nuneaton (SP 340 937). Present beneath younger strata westwards to Malvern 'line'.
has lithology description: Fine-, medium- and coarse-grained volcaniclastic sedimentary rocks with locally abundant tuffs and volcanic breccias. Intruded in Charnwood Forest by massive to brecciated andesites and dacites of the Whitwick Volcanic Complex and the Bardon Hill Volcanic Complex. The rocks are fractured, cleaved and show very low-grade metamorphism (Nuneaton) or upper greenschist metamorphism (Charnwood Forest).
has thickness description: 3000m minimum.
has upper boundary definition: Weathered and eroded, fractured or cleaved volcaniclastic rocks are overlain unconformably by strata ranging from earliest Palaeozoic to Mesozoic age.

Chalkey Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHAC
has current status: CURRENT
has theme: BEDRCK
notation: Ch
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CHAC COAL
broader: PUCM

Charmouth Mudstone Formation And Dyrham Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CHADY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
broader: LI

Beinn A'Chaisteil Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHAI
has current status: CURRENT
has theme: BEDRCK
notation: CHAI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43408
has lithology component: CHAI PSMQZ
has lithology component: CHAI QZITE
has lithology component: CHAI SEMPEL
has source info: CHAI_51600
broader: Lochaber Subgroup
has additional age information: Neoproterozoic (Cryogenian).
has lower boundary definition: Abrupt change to white-weathering pinkish-brown quartzose psammite and quartzite from the preceding psammite to quartzose psammite of the Auch Gleann Psammite Formation.
has geographical distribution: Can be traced as a prominent marker at base of Lochabar Subgroup from western edge of Crianlarich, east then northeastwards into southern parts of Blackwater, then eastwards across southern parts of Loch Rannoch to boundary with Schiehallion.
has lithology description: 20 to 40cm-scale tabular to lenticular bedded grey to pinkish brown quartzite and quartzose psammite. Banded ribbed quartzite and semipelite unit comprising 5 to 10cm-scale interbeds of semipelite. The uppermost part of formation is more thinly bedded (3 to 5cm), and flaggy, comprising white-grey quartzite with minor biotitic quartzite and dark semipelite, and is probably about 5 to 10m thick.
has thickness description: Ranges from 10 - 20m up to c.250m thick, thicker typically in the southern part of the outcrops mapped to date. Approximately 90m thick at Beinn a'Chaisteil.
has upper boundary definition: Abrupt change to the calcareous garnet-mica semipelite and muscovite-quartz semipelite marking the base of the Coire Daingean Semipelite Formation or to the massive garnet-mica semipelite and muscovite-quartz semipelite where the calcareous facies is not developed.

Chapelknowe Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHAK
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: CH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43409
has lithology component: CHAK C
has lithology component: CHAK DMTN
has lithology component: CHAK V
has source info: CHAK_49008
has source info: CHAK_49009
has source info: CHAK_49568
has source info: CHAK_51980
has obsolete equivalent: CHAK mn 879
has obsolete equivalent: CHAK mn 2517
broader: Gretna Till Formation
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Solway Lowlands.
has lithology description: Reddish brown, sandy, silty, clayey, stony diamicton with clasts of greywacke, red sandstone, siltstone and grey granodiorite. Generally very compact.
has thickness description: 20m
has upper boundary definition: Sharp, erosional contact with deposits of the overlying Plumpe Sand and Gravel Formation (or members thereof).

Ben Challum Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHAL
has current status: CURRENT
has theme: BEDRCK
notation: CHAL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43410
has lithology component: CHAL HBSCH
has lithology component: CHAL PSMQZ
has lithology component: CHAL QZITE
has lithology component: CHAL SEMPEL
has source info: CHAL_51600
broader: Crinan Subgroup
has additional age information: Neoproterozoic (Ediacaran).
has lower boundary definition: The change from calcareous "pitted" psammites and semipelites of underlying Ben Lawers Schist Formation appears sharp (in the Allt Challum section) with abrupt loss of any calcareous component and a decrease in the semipelite content, which is typically 50% or more in the Ben Lawers Schist Formation.
has geographical distribution: Occurs east of the Tyndrum Fault, across Beinn Chaorach, Ben Challum and into upper Glen Lochay, Sheet 46W. Always at the boundary between the Ben Lawers Schist Formation and Ben Lui Schist Formation.
has lithology description: 5 to 10m-scale bedded/banded, pale brown quartzite to quartzose psammite with cm-scale schistose quartz, muscovite, +/- biotite semipelite interbeds. Approximately 70:30 psammite/quartzite to semipelite. Quartzite/quartzose psammite beds are thicker (20 to 40cm) in lower part (semipelite less than 3cm-thick layers and less than 20%) of the formation; hornblende schist layers (30 to 40cm thick) are conspicuous.
has thickness description: c.20m
has upper boundary definition: Transitional/gradational change upwards with increasing semipelite proportion into the Ben Lui Schist Formation. Upper limit taken where conspicuous quartzose psammite layers are <20%.

Charmouth Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHAM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ChM
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43411
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43412
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43413
has lithology component: CHAM ARLMST
has lithology component: CHAM FEST
has lithology component: CHAM LMST
has lithology component: CHAM MDST
has lithology component: CHAM SDST
has source info: CHAM_48896
has source info: CHAM_48913
has source info: CHAM_49471
has source info: CHAM_50680
has source info: CHAM_50891
has source info: CHAM_51059
has source info: CHAM_51615
has source info: CHAM_52436
has source info: CHAM_53057
has obsolete equivalent: CHAM mn 504
has obsolete equivalent: CHAM mn 1005
has obsolete equivalent: CHAM mn 2601
has obsolete equivalent: CHAM mn 2604
has obsolete equivalent: CHAM mn 3116
has obsolete equivalent: CHAM mn 576
has obsolete equivalent: CHAM mn 2605
has obsolete equivalent: CHAM mn 2862
broader: LI
narrower: SBNB
narrower: Black Ven Marl Member
narrower: LDGR
narrower: Ditcheat Clay Member
narrower: Green Ammonite Member
narrower: JG
narrower: PTNI
narrower: PYC
narrower: SHWB
narrower: SPLI
narrower: Brandon Sandstone Bed
narrower: Belemnite Marl Member
narrower: Glebe Farm Bed
has lower boundary definition: Taken at the top of Blue Lias Formation or Scunthorpe Mudstone Formation. The top of the Blue Lias coincides with a marked upward decrease in frequency, thickness and lateral persistence of limestone beds. In many cases, the horizon to be taken is obvious. Where there is doubt, the thickness and vertical frequency of limestone beds should be considered, and the following guidelines used: at the top of a more or less persistent, thick (>0.10m) limestone above which the overlying mudstone (beneath any subsequent similar limestone) is at least twice the thickness typical of the underlying limestone-mudstone interbedded unit and above which there is no return, within the Lias Group, to limestone-mudstone spacing on that previous scale. In the type section, at the top of the Grey Ledge (bed 49 of Lang, W D, 1924). In the East Midlands Shelf (northwards), where the Blue Lias is absent but the Scunthorpe Mudstone occurs, the base of the Charmouth Mudstone is taken at the base of thin pebbly ferruginous oolite (Glebe Farm Bed) or, in north Lincolnshire, at the top of the Frodingham Ironstone.
has geographical distribution: Wessex Basin to East Midlands Shelf, i.e. Dorset Coast to c.Market Weighton area, Yorkshire.
has lithology description: Dark grey laminated shales, and dark, pale and bluish grey mudstones; locally concretionary and tabular limestone beds; abundant argillaceous limestone, phosphatic or ironstone (sideritic mudstone) nodules in some areas; organic-rich paper shales at some levels; finely sandy beds in lower part in some areas.
has thickness description: To c.335m
has upper boundary definition: At marked or gradational upward change to coarser siliciclastic deposits of the Dyrham Formation. In the type section, this is at the base of the Three Tiers Sandstone. Where the Dyrham Formation is absent (East Midlands Shelf northwards) it is taken at the base of the Marlstone Rock Formation.

Charlbury Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHAR
has current status: CURRENT
has theme: BEDRCK
notation: CHAR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43414
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43415
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43416
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43417
has lithology component: CHAR CAMDST
has lithology component: CHAR LMOOL
has lithology component: CHAR LMST
has lithology component: CHAR SDST
has source info: CHAR_48821
has source info: CHAR_52641
has source info: CHAR_52657
has obsolete equivalent: CHAR SHHB
has obsolete equivalent: CHAR mn 4019
broader: Great Oolite Group
has lower boundary definition: East of 'Moreton Axis' and to the north of Stow-on-the-Wold, west of the 'Moreton Axis': lower boundary well-defined by the incoming of limestone above the Sharp's Hill Formation, which is commonly a dark bluish gray clay. South of Stow, west of the 'Moreton Axis': well-defined by the incoming of limestone above the Lower Fuller's Earth mudstone succession.
has geographical distribution: East of 'Moreton Axis': limit based on cored boreholes and gamma-ray log characterisation. Extends in the subcrop 10km+ to north-east of Chipping Norton and about same distance east of Charlbury. Eastern limit at lateral passage into the Rutland Formation. Probably confined within 1:50 000 Geological sheets 218 (Chipping Norton) and 236 (Witney). West of 'Moreton Axis': confined to a c.10km-wide WNW-SSE - trending tract between Broadway, Gloucs. (at outcrop) and Fairford, Oxon (western limit at lateral passage into the Fuller's Earth Formation). Known distribution confined to 1:50 000 Geological Sheets 217 (Moreton in Marsh) and 235 (Cirencester).
has lithology description: East of 'Moreton Axis': mainly marly, shelly, shell-detrital limestones and some sparry oolites and oolitic limestones (limestone 60-80% of the formation); subordinate shelly, shell-detrital marls; minor mudstones; entire fossils abundant. West of 'Moreton Axis: shell-fragmental oolites (Farmington Member) and fine-grained sandy limestones, including tilestones (Eyford Member) dominate; the Sevenhampton Marl forms the uppermost unit; ironshot oolitic/pisolitic marls and marly limestones occur at base.
has thickness description: 3m - 3.6m at the type section. 4.2m - 4.8m in boreholes near Stonesfield, Oxon, c. 3km south-east of type section. 4.83m in Stonesfield Borehole No 3 (reference section). About 8m in areas west of the 'Moreton Axis'.
has upper boundary definition: Defined throughout by base of the Taynton Limestone Formation, which comprises mainly clean, sparry, commonly cross-bedded, shell-fragmental oolites and oolitic limestones in which entire fossils are rare; sporadic thin marl beds locally.

Creeslough Formation And Ards Black Schist (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CHAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Appin Group

Castle Haven Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHAV
has current status: CURRENT
has theme: BEDRCK
notation: CHAV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43418
has lithology component: CHAV CONG
has lithology component: CHAV SANDU
has source info: CHAV_48776
has source info: CHAV_50622
has source info: CHAV_51673
has obsolete equivalent: CHAV mn 1358
is obsolete equivalent of: CHAV DRCC
broader: Dunnottar Castle Conglomerate Formation
has lower boundary definition: Overlies the Strathlethan Sandstone Member.
has geographical distribution: The Stonehaven area.
has lithology description: A massive, mainly clast-supported conglomerate, of 'Highland provenance, with lenses of horizontally-laminated, medium-grained sandstone.
has thickness description: 1980 m thick (Carroll, 1995).
has upper boundary definition: The base of the lowest lava flow in the Tremuda Bay Volcanic Formation.

Channelbush Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CHBC COAL
broader: Border Group

Channelbush Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CHBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CHBL LMST
broader: Border Group

Chapelburn Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHBN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CHBN COAL
broader: LDD

Chamber Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CHBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
has lithology component: CHBR SDST
broader: PLCM

Chalbury Glauconitic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHBY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CHBY GLMDST
broader: LC

Coalypath Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHC COAL
broader: NE

Clunch Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: CHCC
has current status: CURRENT
has theme: BEDRCK
notation: CL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CHCC COAL
broader: NE

Craighall Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CHCG
has revision number: 5
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43419
has lithology component: CHCG AND
has lithology component: CHCG BA
has lithology component: CHCG BAANDT
has lithology component: CHCG CONG
has lithology component: CHCG MDST
has lithology component: CHCG SDST
has lithology component: CHCG SLST
has lithology component: CHCG TUF
has source info: CHCG_51116
has source info: CHCG_51659
has source info: CHCG_51673
broader: Arbuthnott-Garvock Group
narrower: Derryhill Lava Member
narrower: Drimmie Lava Member
narrower: Gualdswell Lava Member
narrower: MOML
narrower: Craigies Lava Member
narrower: KLM
narrower: KWLM
narrower: KYLM
narrower: Gormack Lavas Member
has lower boundary definition: An unconformable contact on ignimbrites of the Crawton Volcanic Formation or on Dalradian Supergroup metamorphic rocks, varied along the Highland Border area.
has geographical distribution: The north-western limit of the Strathmore Syncline in the Highland Border area, north-east of Perth in the Midland Valley of Scotland. sheets 48W, 56W, in the Blairgowrie area.
has lithology description: A generally massive, well-rounded pebble and boulder (up to 0.6m diameter) conglomerate, of andesitic lava, locally quartzite and other lithologies of 'Highland' origin, interbedded with andesite, basaltic andesite and basalt lava members, together with minor sandstone, siltstone and mudstone beds.
has thickness description: Over 500 m thick.
has upper boundary definition: The base of the Scone Sandstone Formation, which is locally overlain by the Hatton Conglomerate Member, with the Highland conglomerate overlying the volcanic conglomerate.

Chatwall Flags And Chatwall Sandstone (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CHCH
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CHCH AROC
has lithology component: CHCH SDST
broader: NA
has lithology description: See the Lithology descriptions for the component units.

Carleton Hall Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHCL
has current status: CURRENT
has theme: SPRFCL
notation: CHC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43420
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43421
has lithology component: CHCL C
has lithology component: CHCL V
has lithology component: CHCL Z
has source info: CHCL_48926
has source info: CHCL_49633
has source info: CHCL_50151
broader: Glannoventia Formation
has lower boundary definition: Gradational, conformable contact with underlying laminated silt and clay of the Carleton Silt Formation.
has geographical distribution: West Cumbria.
has lithology description: Silty clay, calcareous, laminated, very stiff, dark brown (Munsell Soil), with sparse dropstone pebbles and cold marine microflora. Laminae are stacked within graded, rhythmic units.
has thickness description: To 11.9m
has upper boundary definition: Gradational, conformable contact with brownish grey sandy silt of the Stubble Green Silt Member of the Glannoventia Formation, or, sharp, planar, unconformable contact with stony diamicton of the Holmrook Till Member of the Blengdale Glacigenic Formation.

Crow Hill Conglomerate And Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHCM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Chase Coals (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CHCO COAL
broader: PMCM

Coleford High Delf Coal (Forest Of Dean)
type: Concept
in scheme: NamedRockUnit
alternative label: CHDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CHDC COAL
broader: Coleford Member

Castle Head Dolerite
type: Concept
in scheme: NamedRockUnit
alternative label: CHDY
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Chemiss Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: CHE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CHE COAL
broader: MCMS

Cheshire Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CHEC COAL
broader: PMCM

Chemical Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: CHEMD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: SUPD
narrower: NCARB
narrower: Duricrust
narrower: TUFA
narrower: Bog Iron Ore

Chenier Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: CHEN
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: CHEN CLAY
has lithology component: CHEN GRAV
has lithology component: CHEN SANDU
has lithology component: CHEN SILT
broader: STDU
has lithology description: Sand and gravel; inter-chenier deposits are typically more clay- and silt-rich. A chenier is a beach-ridge or linear mound on marshland. [Generic description: earth science dictionaries in the BGS library].

Cheviot Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHEV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43422
has lithology component: CHEV AND
has lithology component: CHEV PYRBRC
has lithology component: CHEV RYRBP
has lithology component: CHEV TUF
has lithology component: CHEV VLSS
has source info: CHEV_48975
has source info: CHEV_51624
has source info: CHEV_51673
has source info: CHEV_52293
has obsolete equivalent: CHEV mn 901
has obsolete equivalent: CHEV mn 900
has obsolete equivalent: CHEV mn 902
broader: REST
has lower boundary definition: The base of the volcanic rocks resting unconformably on Wenlock strata or, locally the White Hill Sandstone Formation.
has geographical distribution: The Cheviot Hills in Northumberland and the Scottish borders.
has lithology description: A thick pile of andesitic lava with associated pyroclastic and reworked volcanic rocks, subordinate biotite-phyric rhyolite and tuff.
has thickness description: At least 1000 m thick.
has upper boundary definition: The top of the volcanic pile, uncomnformably overlain by the upper Devonian to lower Carboniferous rocks.

Cheviot Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: CHEVD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: CHEVD AND
has lithology component: CHEVD DA
has lithology component: CHEVD FELS
has lithology component: CHEVD LMPY
has lithology component: CHEVD QFP
has lithology component: CHEVD QZP
broader: SDCAD

Cheviot Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CHEVP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: CHEVP GN
broader: Galloway Granitic Suite

Chatwall Flags
type: Concept
in scheme: NamedRockUnit
alternative label: CHF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE
has geographical distribution: Church Stretton to Caradoc (north) area.
has lithology description: Yellowish brown flags.
has thickness description: 25 to 100m

Chiefswood Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CHFD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CHF
has revision number: 0
has rock unit rank: WT
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43423
has lithology component: CHFD AGG
has lithology component: CHFD TR
has source info: CHFD_48959
has source info: CHFD_50846
broader: KELSO
has lower boundary definition: Intrusive contact.
has geographical distribution: Melrose area, Scottish Borders.
has lithology description: Agglomerate-filled volcanic neck.
has thickness description: n/a
has upper boundary definition: Intrusive contract

Chelford Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHFDS
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43424
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43425
has lithology component: CHFDS P
has lithology component: CHFDS S
has lithology component: CHFDS V
has lithology component: CHFDS Z
has source info: CHFDS_50375
has source info: CHFDS_50820
has source info: CHFDS_51038
has source info: CHFDS_51440
has obsolete equivalent: CHFDS mn 892
has obsolete equivalent: CHFDS mn 1025
broader: Britannia Catchments Group
has lower boundary definition: Irregular contact with bedrock or deposits of the Oakwood Glacigenic Formation.
has geographical distribution: Cheshire.
has lithology description: White to "buff", well-sorted sand, with minor gravel, silt and peat lenses with sporadic in situ tree stumps and wood clasts.
has thickness description: To 20m.
has upper boundary definition: Unconformable beneath till, sand and gravel of the Stockport Glacigenic Formation.

Cowdenbeath Five Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHFF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHFF COAL
broader: LSC

Chatsworth Grit
type: Concept
in scheme: NamedRockUnit
alternative label: CHG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: CHG MDST
has lithology component: CHG SDST
has lithology component: CHG SLST
has source info: CHG_50592
has obsolete equivalent: CHG RVG
has obsolete equivalent: CHG mn 3795
broader: MARSD
has lower boundary definition: The first sandstone or sandstones above the Verneulites sigma or Bilinguites Marine Bands. If no marine bands have been proved, it is the base of the second main sandstone or sandstones below the top of the Millstone Grit Group.
has geographical distribution: South Yorkshire, Derbyshire, Nottinghamshire & Leicestershire.
has lithology description: Fine to coarse grained, massive and cross bedded, locally pebbly sandstones, with minor interbedded mudstone and siltstone.
has thickness description: Up to 90 m thick.
has upper boundary definition: The top of the first main sandstone below the Cancelloceras Marine Band. If no Marine Bands are proved it is the top of the second or third main sandstone below the top of the Millstone Grit Group. Where the Redmire Flags are present it is the third sandstone; Where the Redmire Flags are absent it is the second sandstone. It is normally at least 30m below the top of the Group.

Chapelgreen Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHGC COAL
broader: ULGS

Chaigley Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Chgl
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43427
has lithology component: CHGL LMST
has lithology component: CHGL MDST
has lithology component: CHGL SLST
has source info: CHGL_49284
has source info: CHGL_49848
broader: HOM
narrower: Dunbarella Bed
has lower boundary definition: Taken at the first coarse-grained packstone that lies above a succession of thin-bedded, laminated, calcisiltites and mudstones of the Hodder Mudstone Formation (undifferentiated).
has geographical distribution: Restricted to the western part of the Craven Basin, including the Dinckley (SD 70 35) and Thornley (SD 62 40) anticlines, southern limb of the Plantation Farm Anticline (SD 66 43) and the northern limb of the Clitheroe Anticline (SD 75 45).
has lithology description: Packstones and floatstones, bioclastic, mainly medium- to coarse-grained, dark grey, thin-to-medium-bedded, commonly graded and laminated. May show soft sediment deformation structures such as slump folds and convolute ripples. Many beds display erosive, tool-marked and fluted basal surfaces and some beds contain coarse-grained lags and mudstone lithoclasts. The interbedded mudstones are dark grey, fissile, pyritic and locally sideritic and mainly barren of macrofauna. Dark sandy ferruginous siltstones with plant debris also occur.
has thickness description: To 180m
has upper boundary definition: Packstones and floatstones of the Chaigley Limestone Member are overlain by slumped, blocky, calcareous mudstones of the Hodder Mudstone Formation (undifferentiated).

Chelsfield Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: NO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43428
has lithology component: CHGR S
has lithology component: CHGR V
has lithology component: CHGR XVFLY
has source info: CHGR_51313
has source info: CHGR_52673
has source info: CHGR_52949
has obsolete equivalent: CHGR mn 893
has obsolete equivalent: CHGR mn 941
has obsolete equivalent: CHGR mn 476
has obsolete equivalent: CHGR DBLB
broader: RESID
has lower boundary definition: Unconformable on Upper Chalk or Thanet Sand or in uncertain, possibly overlying relationship above clay-with-flints head. Poorly exposed.
has geographical distribution: The deposit extends for 500m in the type area: other deposits occur on the Dartford (271) sheet from Knockmill [57 61] to Holly Hill [66 62]. May be present also south of Dartford sheet.
has lithology description: Well rounded flint pebble gravels, sandy gravels, pebbly sands and sands. Lithologies similar to those in Harwich Formation (formerly Blackheath Beds) from which it is thought to have been mainly derived.
has thickness description: Variable and uncertain, not exposed. Typically 2-5m. May be 10m where infilling hollows or pipes in Chalk.
has upper boundary definition: At surface.

Chapel House Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: CHHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CHHC COAL
broader: SMGP

Chinastones
type: Concept
in scheme: NamedRockUnit
alternative label: CHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

China Coal (Falkirk; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: CHIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHIC COAL
broader: LSC

Chick Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: CHIK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CHIK COAL
broader: Downend Member

Cligga Head Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CHIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: CHIN GN
broader: NE

Cowdenbeath Jewel Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHJ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHJ COAL
broader: LSC

Chilmark Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Chk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43429
has lithology component: CHK LMOOL
has source info: CHK_48665
has source info: CHK_48666
has source info: CHK_49228
has source info: CHK_49229
has source info: CHK_51181
has source info: CHK_52707
has obsolete equivalent: CHK mn 908
has obsolete equivalent: CHK mn 4338
broader: POST
has lower boundary definition: Incoming of significant ooliths above sequence of micrites of the Wockley Member.
has geographical distribution: On north side of river Nadder between Fonthill Bishop and Chilmark; south of River Nadder between Wockley [ST 9555 2870] and Chicksgrove [ST 964 296] quarries.
has lithology description: Fine-grained oolitic limestone.
has thickness description: 0-6m.
has upper boundary definition: Base of "Dirt Bed" at base of Purbeck Formation.

Chatburn Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ChL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43430
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43432
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43431
has lithology component: CHL CAMDST
has lithology component: CHL CASLST
has lithology component: CHL LMST
has source info: CHL_49353
has source info: CHL_49551
has source info: CHL_50498
has source info: CHL_51817
has source info: CHL_52420
has obsolete equivalent: CHL mn 886
has obsolete equivalent: CHL st 409
has lateral equivalent: CHL st 409
broader: Bowland High Group
narrower: Bold Venture Beds
narrower: Bankfield East Beds
narrower: MTSL
narrower: Gisburn No.1 Limestone
narrower: Gisburn No.2 Limestone
narrower: Gisburn No.3 Limestone
narrower: Gisburn No.4 Limestone
narrower: Gisburn No.5 Limestone
narrower: HRF
narrower: WHTL
narrower: LHRL
narrower: Gisburn Cotes Beds
has lower boundary definition: Not exposed or proved.
has geographical distribution: Widespread across the Craven Basin from the Whitewell area [SD64] in the west to the Skipton/Broughton area [SD95] in the east, where it includes the Haw Bank Limestone (q.v.).
has lithology description: Well-bedded, mostly grey to dark grey packstone limestones with chert lenses and subordinate partings or thin beds of shaly calcareous mudstone and siltstone.
has thickness description: At least 838m measured thickness (base not proved).
has upper boundary definition: Taken where the dominant lithology described above, passes conformably upwards into either the dark shale-with-limestone lithology of the undifferentiated Craven Group in basinal areas, or into the paler, "more coarsely bioclastic and cleaner washed" limestone of the Clitheroe Limestone Formation on the Bowland High.

Cheney Longville Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHLF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OM
has lithology component: CHLF SDST
has lithology component: CHLF SLST
has obsolete equivalent: CHLF mn 895
broader: NP
has lithology description: Yellowish brown siltstones and sandstones.
has thickness description: c.120m in the Church Stretton area; to c.250m in the Caradoc (north) area.

Camphill Gelifluctate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CHLGE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43433
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43434
has lithology component: CHLGE S
has lithology component: CHLGE V
has source info: CHLGE_49172
has source info: CHLGE_49716
has source info: CHLGE_50162
has source info: CHLGE_50626
has source info: CHLGE_50875
has source info: CHLGE_50897
has source info: CHLGE_51989
has source info: CHLGE_52002
has source info: CHLGE_52214
has source info: CHLGE_52951
has obsolete equivalent: CHLGE CHLGE
has obsolete equivalent: CHLGE mn 2258
has obsolete equivalent: CHLGE mn 2262
has obsolete equivalent: CHLGE mn 1063
has obsolete equivalent: CHLGE mn 2259
is obsolete equivalent of: CHLGE CHLGE
broader: WLSG
has additional age information: Wolstonian (?MIS 6).
has lower boundary definition: The lower boundary of the unit is gradational (typically over 0.05m) with organic sand of the underlying Swineden Sand Bed in Kirkhill Quarry (infilled). In Leys Quarry (disused) it unconformably overlies white sand of the truncated Kirkhill Palaeosol Bed.
has geographical distribution: Buchan, northeast Scotland. The gelifluctate bed in only known within the immediate vicinity of Kirkhill quarry (infilled) (centred on NK 0120 5285) and Leys quarry (disused) (centred on NK 0040 5250) on Sheet 87W (Ellon).
has lithology description: Gravel and diamicton gravel. Crudely bedded over pale olive brown and pale pinkish brown, pebble-cobble gravel, clast supported with a matrix of coarse quartzose or felsitic sand typically overlying matrix supported pebble gravel with a silty sand matrix. Clasts are very angular and subangular. Clast lithologies are dominated by felsite with subsidiary psammites, quartzites, basic igneous rocks and red and grey granites. Thin beds of rippled fine-medium quartzose sand are present locally. In Kirkhill quarry (infilled) frost cracks penetrate downwards from within this bed, through the underlying Kirkhill Palaeosol Bed into the Pitscow Sand and Gravel Formation. In Leys quarry (disused) truncated ice wedge casts also descend from the top of the bed down through the Kirkhill Palaeosol Bed into the Pitscow Sand and Gravel Formation beneath. Interpreted as periglacial talus and gelifluction deposits.
has thickness description: To 2.5m
has upper boundary definition: In Kirkhill Quarry (infilled) the upper boundary of the unit is a subhorizontal, planar erosion surface overlain unconformably by yellowish brown diamicton of the Rottenhill Till Formation. In Leys Quarry (disused) the upper boundary of the unit is an erosional unconformity, with channels (up to 1m in depth) filled with sandy gravels of the West Leys Sand and Gravel Formation.

Cheltenham Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43435
has lithology component: CHLM CLAY
has lithology component: CHLM LMST
has source info: CHLM_49692
has source info: CHLM_51233
has source info: CHLM_52165
broader: LLY
has lower boundary definition: The base is placed at the base of the lowest bedded limestone, where it sharply overlies the topmost rubbly limestone or clay with limestone nodules that forms the topmost bed of the underlying Clydach Halt Member.
has geographical distribution: Northeast crop of the South Wales Coalfield; the Cheltenham Limestone Member is the most widespread of the members of the Llanelly Formation, with the same geographic limits - from the Hepste Valley [SN 971 129] east to the Clydach gorge [SO 214 125] and southwards down the east crop on the west side of the Afon Lwyd valley to about 1km south of Blaenavon [SO 261 077].
has lithology description: Thin- to medium-bedded, mainly fine-grained limestones with pale green clay interbeds; the limestones are commonly arranged in fining-upwards cycles and comprise grainstone, wackestone and lime mudstone (including algal laminites).
has thickness description: 1.7m at Cwar yr Hendre [SO 099 149] to 8m in the Clydach gorge [SO 224 125].
has upper boundary definition: The top is placed at the sharp junction between the topmost fine-grained limestone of the Cheltenham Limestone Member and the base of the ooidal grainstone at the base of the overlying Penllwyn Oolite Member. A palaeosol horizon is commonly present at the top of the Member, its top marking the junction.

Chatburn Limestone Formation And Thornton Limestone Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CHLTL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
broader: NA

Chalk Of Mull - Morvern
type: Concept
in scheme: NamedRockUnit
alternative label: CHM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
has lithology component: CHM MDST
broader: NE

Cockhill Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CHMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lateral equivalent: CHMB E2A1
broader: SILS

Cinderhill Main Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: CHMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CHMC COAL
broader: PMCM

Carham Limestone Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CHML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43437
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43436
has lithology component: CHML CHRT
has lithology component: CHML DOLMST
has source info: CHML_48669
has source info: CHML_49707
has obsolete equivalent: CHML mn 789
has obsolete equivalent: CHML mn 788
broader: Ballagan Formation
has lower boundary definition: Conformable boundary on sedimentary rocks, mainly mudstone and siltstone, of the Ballagan Formation.
has geographical distribution: Local development in the Ballagan Formation on the north and south banks of the River Tweed; best development around Carham, Northumberland.
has lithology description: White, nodular dolomitic limestone with MgCO3 content of 38.95% (Robertson et al., 1949), interbedded with chert.
has thickness description: To 7.5m
has upper boundary definition: Conformable boundary with overlying interbedded mudstone, siltstone and sandstone of the Ballagan Formation.

China Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CHMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CHMR SDST
has obsolete equivalent: CHMR mn 911
broader: PLCM

Chama Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHMS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CHMS SANDU
has obsolete equivalent: CHMS mn 875
has obsolete equivalent: CHMS mn 876
broader: Barton Group

China Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CHNC COAL
has lateral equivalent: CHNC st 184
has obsolete equivalent: CHNC mn 910
broader: PLCM

Chonetes Shale
type: Concept
in scheme: NamedRockUnit
alternative label: CHNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CHNS MDST
has source info: CHNS_51867
broader: SH5
has supplementary information: These beds form the lowest part of the Fifth Shale [Member] and contain abundant Chonetes cf. hardrensis [according to the Lexique Stratigraphique International, 1971, p.95).

Chanter Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHNT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
broader: PIPR

Carr House Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHOC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CHOC COAL
broader: PLCM

Child Okeford Sands Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHOS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ChO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43438
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43439
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43440
has lithology component: CHOS SANDU
has source info: CHOS_49334
has source info: CHOS_50798
has source info: CHOS_51584
has source info: CHOS_52347
broader: LGS
has lower boundary definition: Rests unconformably on various Jurassic formations.
has geographical distribution: Across the northern part of the Shaftesbury Sheet (313), south-eastern part of the Wincanton Sheet (297) and onto the Salisbury Sheet (298), beyond which it has not been mapped to date.
has lithology description: Glauconitic, fine- to medium-grained, locally clayey sand.
has thickness description: 0 - c.10m
has upper boundary definition: Upward change to extremely clayey glauconitic sand and sandy clay of the Bedchester Sands, or, in its absence, to the sandy clay of the Gault.

Chapel House Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43441
has lithology component: CHPL CONG
has lithology component: CHPL LMST
has lithology component: CHPL MDST
has lithology component: CHPL SDST
has lithology component: CHPL SLST
has source info: CHPL_50498
has source info: CHPL_52099
has lateral equivalent: CHPL st 615
broader: Great Scar Limestone Group
has lower boundary definition: Drawn at base of conglomerate of the Chapel House Limestone Formation where it rests with significant non-sequence on the deeply fissured limestone top surface to the Stockdale Farm Formation, which comprises limestone, siltstone and mudstone. It lies directly on Lower Palaeozoic rocks elsewhere.
has geographical distribution: A series of inliers in the southernpart of the Askrigg Block, North Yorkshire, including Gordale Beck (SD 91 65), Stainforth Force on the River Ribble (SD 82 67) and Barrel Sykes, north of Settle (SD 82 64). Proved elsewhere in the subsurface of the Settle area in boreholes.
has lithology description: The lower part of succession is dominated by mid to mid-pale grey, medium- and coarse-grained calcarenite, oolitic grainstones interbedded with conglomerates, "mixed laminates" (ie. interbedded siltstone with sandstone and mudstone laminae), dolomicrites and fenestral or algal lime-mudstones. Argillaceous wackestones occur locally in the upper part of the formation.
has thickness description: Maximum of about 56m adjacent to the Middle Craven Fault, with 33.6m in the type section.
has upper boundary definition: Drawn at sharp conformable upward passage from grainstone of the Chapel House Limestone Formation to darker limestones of the Scalebar Force Limestone Member (Kilnsey Formation).

Camphouse Quartz-Dolerite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CHQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Ardnamurchan Centre 1

Cross Hands Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CHR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
broader: Great Oolite Group

Christchurch Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHRM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GY
has predominant age: GY
has youngest age: GY
broader: LC

Chatelherault Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CHRS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
broader: NE

Chatwall Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CHS SDST
broader: NE
has geographical distribution: Church Stretton - Caradoc area.
has lithology description: Purple and brown sandstone.
has thickness description: to c.100m

Cromhall Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40942
has lithology component: CHSA DOLMST
has lithology component: CHSA LMST
has lithology component: CHSA MDST
has lithology component: CHSA SDST
has lithology component: CHSA SEATS
has lithology component: CHSA SLST
has source info: CHSA_49279
has source info: CHSA_49355
has source info: CHSA_52350
has obsolete equivalent: CHSA mn 2556
has obsolete equivalent: CHSA mn 2569
has obsolete equivalent: CHSA mn 2838
has obsolete equivalent: CHSA mn 4363
has obsolete equivalent: CHSA mn 4372
has obsolete equivalent: CHSA mn 1328
broader: PEMB
narrower: LCS
narrower: MOLB
narrower: Chonetes Polita Limestone
narrower: UCS
narrower: MCS
narrower: RHCB
narrower: TL
has lower boundary definition: Lower boundary of the Cromhall Sandstone Formation is taken at the base of the lower tongue, which is taken at the base of the first sandstone overlying the calcite and dolomite mudstones and limestones of the underlying Clifton Down Mudstone Formation in the Bristol area and the Llanelly Formation in the Monmouth and Chepstow area. Base of middle tongue is taken at the base of the first sandstone in the upper part of the Clifton Down Limestone Formation. Base of the upper tongue is taken at the base of the first sandstone or mudstone above the skeletal and oolitic limestones of the Oxwich Head Limestone Formation.
has geographical distribution: Bristol, [ST 60 74] Monmouth and Chepstow area [ST 53 930]. Passes laterally southwards into formations of the Pembroke Limestone Group [Llanelly Formation, Clifton Down Mudstone, Clifton Down Limestone and Oxwich Head Limestone formations].
has lithology description: Includes up to three tongues. The lower tongue comprises brown and red fine- to coarse-grained quartzitic sandstone with subordinate mudstones and sparse thin limestones. Base is locally conglomeratic. The middle tongue is similar but contains units of dolomitised limestone. The upper tongue comprises grey and red coarse-grained quartzitic sandstones, sandy crinoidal and oolitic limestones, mudstones, siltstones and grey seatearths arranged in cyclic sequences. Units of crinoidal and oolitic limestone are locally developed. The formation was deposited mainly in a fluvial environment on a marine influenced coastal plain.
has thickness description: Lower tongue: 6m at Chipping Sodbury to 43m at Cromhall. Middle tongue: 27m at Chipping Sodbury to 30m at Tytherington. Upper tongue: 18m on Broadfield Down thickening north to 240m at Cromhall.
has upper boundary definition: Lower tongue: Top taken at the incoming of calcite mudstones and oolitic and skeletal limestones of the Clifton Down Limestone in the Bristol area and the Hunts Bay Oolite Subgroup in the Monmouth and Chepstow area above the sandstones and mudstones of the lower tongue. Middle tongue: Top taken at the base of the entrance of the skeletal limestones of the Oxwich Head Limestone Formation above the sandstones and mudstones of the middle tongue. Upper boundary of the Cromhall Sandstone Formation taken at top of upper tongue: Top taken at entrance of limestones of the overlying uppermost Oxwich Head Limestone Formation or cherts and cherty marine mudstones of the overlying undivided Tenby Group above the sandstones and mudstones of the upper tongue.

Cheese Bay Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CHSBY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: CHSBY BAOCM
broader: LAFAS

Charles Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CHSC COAL
has lateral equivalent: CHSC st 318
broader: PMCM

Cowdenbeath Seven Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHSF COAL
has lateral equivalent: CHSF st 143
has lateral equivalent: CHSF st 405
broader: LSC

Cheltenham Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: CHSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40943
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40944
has lithogenesis: AEOLD
has lithology component: CHSG CLAY
has lithology component: CHSG GRAV
has lithology component: CHSG SANDU
has source info: CHSG_48908
has source info: CHSG_48930
has source info: CHSG_50495
has source info: CHSG_50541
has source info: CHSG_50680
has source info: CHSG_50978
has source info: CHSG_51648
has source info: CHSG_52120
has source info: CHSG_52194
has source info: CHSG_52431
has source info: CHSG_52929
has obsolete equivalent: CHSG mn 894
has obsolete equivalent: CHSG mn 2140
has obsolete equivalent: CHSG mn 1015
broader: NE
has lower boundary definition: Bedrock surface beneath deposit or underlying superficial deposit. Base channelled, notably under Cheltenham.
has geographical distribution: Gloucestershire, Severn Vale, east of the river, from Tewkesbury [SO 90 32] through Cheltenham and Gloucester, possibly as far as Little Sodbury [ST 75 83].
has lithology description: Sand, quartzose, fine- to medium-grained, generally unbedded, with seams of poorly sorted predominantly limestone gravel, especially in the lower part. Sand probably derived by aeolian processes from nearby river terrace deposits. Gravel largely Middle Jurassic ooidal limestone derived probably by solifluction from the nearby Cotswold escarpment, plus ironstone and derived fossils. Rare clay lenticles.
has thickness description: Up to about 15m, very variable.
has upper boundary definition: Upper surface of deposit, other deposits may overlie. Generally planar surface.

Champfleurie Shale
type: Concept
in scheme: NamedRockUnit
alternative label: CHSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CHSH SAPEL
broader: HON

Cowie Harbour Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHSI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CHSI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40945
has lithology component: CHSI SDST
has lithology component: CHSI SLST
has source info: CHSI_48877
has source info: CHSI_48878
has source info: CHSI_49956
has source info: CHSI_50010
has source info: CHSI_51500
has source info: CHSI_51655
has source info: CHSI_51673
has source info: CHSI_51745
has source info: CHSI_51938
has obsolete equivalent: CHSI mn 1257
broader: Cowie Sandstone Formation
narrower: CWFB
has lower boundary definition: Grey, cross-laminated sandy siltstones of the Cowie Harbour Siltstone Member overlying red, trough cross-bedded medium-grained sandstone of the Red Sandstone Member
has geographical distribution: Stonehaven area.
has lithology description: A fine- to medium-grained lithic sandstone interbedded with minor amounts of conglomerate and siltstone.
has thickness description: From 36 m to 90 m thick.
has upper boundary definition: Grey, laminated sandy siltstones overlain by red, trough, cross-bedded and horizontally-laminated, medium-grained sandstone of the Carron Sandstone Formation.

Corkhill Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Counter Head Siltstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHST
has current status: CURRENT
has theme: BEDRCK
notation: CHST
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40946
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40947
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40948
has lithology component: CHST MDST
has lithology component: CHST SDST
has lithology component: CHST SLST
has source info: CHST_49235
has source info: CHST_49992
has source info: CHST_50558
has source info: CHST_52171
has source info: CHST_52860
has obsolete equivalent: CHST mn 336
has obsolete equivalent: CHST mn 1400
has obsolete equivalent: CHST mn 1087
broader: Crovie Sandstone Group
has lower boundary definition: Base of siltstone sequence conformably resting on the red conglomerate sandstones of the Dundarg Formation.
has geographical distribution: Counter Head to Gardenstown Seatown on southern Moray Firth coast.
has lithology description: Siltstone with pedogenetic carbonate.
has thickness description: 100m+
has upper boundary definition: Incoming of the first ripple cross laminate fine-grained micaceous sandstones of the Gamrie Bay Formation.

Craghouse Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ChT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40950
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40949
has lithology component: CHT LPTUF
has source info: CHT_50725
has source info: CHT_53059
has obsolete equivalent: CHT mn 1099
broader: Birker Fell Andesite Formation
has lower boundary definition: Junction of lapilli tuff with underlying unnamed volcaniclastic sandstone, or andesite sheet/lava flow, or Seatallan Dacite.
has geographical distribution: Wasdale area, Cumbria.
has lithology description: Lapilli-tuff; andesitic-dacitic, commonly eutaxitic, crystal-rich, ignimbrite.
has thickness description: Highly variable - 30-800m
has upper boundary definition: Junction of lapilli-tuff with overlying volcaniclastic sandstone or andesite (Wrighthow Member).

Charlotte Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CHTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CHTC COAL
has lateral equivalent: CHTC st 180
has obsolete equivalent: CHTC mn 883
broader: PUCM

Cowdenbeath Two Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHTF COAL
broader: NE

Chudleigh Group
type: Concept
in scheme: NamedRockUnit
alternative label: CHUD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40951
has lithology component: CHUD CHRT
has lithology component: CHUD CONG
has lithology component: CHUD MDST
has lithology component: CHUD SDST
has source info: CHUD_49279
has source info: CHUD_50238
has source info: CHUD_52415
has source info: CHUD_52582
has obsolete equivalent: CHUD mn 1180
broader: Culm Supergroup
narrower: WCH
narrower: UGST
has lower boundary definition: In the Chudleigh area the lower boundary is taken at the incoming of black sooty and siliceous mudstones of the Chudleigh Group (Winstow Chert Formation) above the purple, green and grey mudstones of the underlying Tamar Group (Whiteway Mudstone Formation). The contact is generally sharp. In the Plymouth area it is taken at the incoming of dark grey cherts and siliceous mudstones of the Chudleigh Group (Winstow Chert Formation) above the mid grey silty mudstones of the Tamar Group (Saltash Formation).
has geographical distribution: In the Chudleigh (SX 870 784) and East Ogwell (SX 845 695) areas, south Devon and in the middle Tamar valley (SX 43 61) in the Plymouth area, on the Devon/Cornwall border.
has lithology description: Thin bedded cherts and siliceous mudstones, black mudstones and limestones passing up into thick-bedded to massive sandstones with subordinate conglomerate and mudstone.
has thickness description: Not known but probanly about 550m+
has upper boundary definition: The upper boundary is taken at an angular unconformity where fine-grained glauconitic sandstone of the Upper Greensand Formation rests upon thick-bedded to massive, locally pebbly to conglomeratic sandstone of the Ugbrooke Sandstone Formation.

Allt A'Chuirn Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHUI
has current status: CURRENT
has theme: BEDRCK
notation: CHUI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40952
has lithology component: CHUI QZITE
has lithology component: CHUI SEMPEL
has source info: CHUI_52851
broader: Beinn An Dothaidh Formation
has additional age information: Neoproterozoic (Cryogenian).
has lower boundary definition: The base is gradational with the underlying part of the Beinn an Dothaidh Formation, with an upwards change to quartzite as the dominant lithology.
has geographical distribution: The Member has a restricted occurance on the southern slopes of Beinn a' Chuirn, upper Auch Gleann. Sheet 46W (Crianlarich).
has lithology description: 10 to 30cm-thick layers of quartzite, commonly ribbed in appearance; muscovitic semipelite typically accounts for less than 10% of the lithology, The base is gradational with the underlying part of the Beinn an Dothaidh Formation.
has thickness description: c 200m thickness is observed in the Allt a'Chuirn section but is greatly thickened by the effects of folding, estimated stratigraphical thickness is in the order of 30 to 50m.
has upper boundary definition: Abrupt change to the more uniform garnetiferous semipelite rocks of the Beinn Dorain Semipelite Formation.

Chudleigh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CHUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
broader: NE

Churston Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHUR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
has lithology component: CHUR LMST
broader: Brixham Limestone Formation

Cheeveley Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: CHVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CHVC COAL
broader: PMCM

Charles Hill Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CHVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40953
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40954
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40955
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40956
has lithology component: CHVO BA
has lithology component: CHVO BAMCP
has lithology component: CHVO BAOM
has lithology component: CHVO BATUF
has lithology component: CHVO LMST
has lithology component: CHVO LPTUF
has lithology component: CHVO MDST
has source info: CHVO_49454
has source info: CHVO_49487
has obsolete equivalent: CHVO mn 880
broader: Anstruther Formation
has lower boundary definition: Defined at the base of the lowest lava flow or bed of volcaniclastic rock resting on non-cyclic fluvial and lacustrine sedimentary rocks of the underlying Fife Ness Formation, which consists of sandstones and mudstones with beds of carbonate (limestone and dolostone). The contact is nowhere seen and therefore might be tranistional, sharp or unconformable.
has geographical distribution: Known at Aberdour, Fife Coast and possibly in South Fod Borehole near Dunfermline. Volcanic rocks, now no longer exposed at Silverknowes [NT 205 776] on the shore of the Firth of Forth at Granton-Carmond, Edinburgh, have also been assigned to this member here interbedded into the Gullane Formation. This outcrop of basaltic lavas and tuffs, once quarried on the coastline, extends the supposed occurrence of the volcanic member across the Inchkeith Fault and intercalates it with the Abbeyhill Shales.
has lithology description: Consists of pale greenish-grey to grey, amygdaloidal, earthy weathered to hard microporhyritic olivine basalt (Dalmeny type) lava flows and beds of grey and "pink" volcaniclastic airfall and/or waterlain lapilli tuff. Beds of limestone and mudstone are known very locally (as on Meadulse).
has thickness description: Tens of metres, but very uncertain, assessed as more than 30m thick at Charles Hill.
has upper boundary definition: Defined by the highest tuff bed that is overlain by the non-cyclic sedimentary rocks of the overlying Anstruther Formation, consisting of dark grey to black lacustrine mudstones with thin beds of argillaceous ostracod-bearing limestone and dolostone and pale grey sandstone.

Cowdenbeath Wee Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CHW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CHW COAL
broader: NE

Chwarelau Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CHWA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CHWA COAL
broader: PLCM

Chert Beds (Of West Cumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: CHWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Cherwerfri Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHWE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SL
broader: NP

Chatburn Limestone Group And Worston Shale Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CHWS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: CHWS BREC
has lithology component: CHWS CAMDST
has lithology component: CHWS CONG
has lithology component: CHWS LMST
has lithology component: CHWS SDST
has lithology component: CHWS SLST
broader: NE
has lithology description: See the Lithology descriptions for the component groups.

Caerhys Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CHY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Chy
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: CHY SLMDST
has source info: CHY_52037
broader: NP
has lower boundary definition: Not defined.
has geographical distribution: 1:50,000 Sheet 209 (St.David's).
has lithology description: Mudstones, tuffaceous near base and silty in upper part.
has thickness description: c 80 - 100 metres.
has upper boundary definition: Not defined.

Claxby Ironstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CI
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40957
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40958
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40959
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40960
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40961
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40962
has lithology component: CI AROC
has lithology component: CI FEST
has lithology component: CI MDST
has lithology component: CI SLMDST
has lithology component: CI SLST
has source info: CI_48993
has source info: CI_48994
has source info: CI_49004
has source info: CI_49005
has source info: CI_49555
has source info: CI_50139
has source info: CI_50335
has source info: CI_50833
has obsolete equivalent: CI mn 939
has obsolete equivalent: CI mn 1540
has obsolete equivalent: CI st 536
has obsolete equivalent: CI mn 938
broader: NP
narrower: Hundleby Clay Member
has lower boundary definition: Between Benniworth and Donnington-on Bain [Lincolnshire] the base is defined by a downsection change from grey and brown, ferruginous, oolitic mudstones [Hundleby Clay Member, Claxby Ironstone Formation] [Casey, 1973]. Farther north, where the Hundleby Clay Member is missing, argillaceous, oolitic ironstone is separated from the underlying pale-yellow sandstones [upper part of Spilsby Sandstone Formation] by an erosion surface. At Nettleton a basal conglomerate contains derived fossils from the Spilsby Formation [Casey, 1973; Kelly and Rawson, 1983]. Borehole evidence suggests that below The Wash, bioturbated, shelly silt and glauconitic sand [which appears to be the Hundleby Member] overlies brown ironstone and fine-grained, silty sand [Mintlyn Member of the Sandringham Sands Formation] [Wingfield et al., 1978].
has geographical distribution: The southerly extent of the Claxby Formation is below The Wash. It is present in Wash borehole 72/77A, but does not reach the Norfolk coast, where the coeval upper part of the Sandringham Sands Formation is found. The formation extends through southern Lincolnshire as far north as the Brigg district and finally disappears north of Audleby where the Tealby Formation oversteps it.
has lithology description: Pale grey to dark brown, ferruginous oolitic, silty clay with varying concentrations of oolitic ironstone and pink or cream, calcareous, siltstone bands at some levels. Chert and quartz grit are found at some horizons. Phosphatic nodules, which occur at some horizons, contain moulds of shelly fossils, including ammonites, belemnites and bivalves. In southern Lincolnshire, the lower part of the formation comprises pale, purple-grey, mottled brown, silty clay [Hundleby Clay Member]. The top of the formation is more calcareous and has been termed "calcareous beds" by some authors.
has thickness description: Up to 8m [an estimated 9m was recorded at Dalby by Owen and Thurrell, 1968]
has upper boundary definition: The Claxby Ironstone Formation grades into the overlying Tealby Formation, although a minor erosion surface has been used to separate the calcareous mudstones at the top of the Claxby Ironstone Formation [Upper Claxby Ironstone Member of Gaunt et al., 1992], from the overlying oolitic clays of the Tealby Clay Formation.

Cistern Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CIC COAL
broader: NE

Crewi Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CIF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: CIF MDST
has lithology component: CIF SDST
has lithology component: CIF SLST
has source info: CIF_48705
broader: NE
has lower boundary definition: Taken to be at the base of a laterally traceable anoxic mudstone (graptolitic) horizon (7878 0050).
has geographical distribution: Confined to southeast corner of Sheet 149, only present on Sheet SH70SE. Best exposed in base of River Crew.
has lithology description: Comprises banded mudstones and siltstones. Very minor sandstones. Banding is characteristically wide - 10-30cm +, is common. May reach 60cm. Turbiditic mudstones overlain by oxic or anoxic hemipelagite intervals. Graptolitic units may be present.
has thickness description: At least about 800m thick, top of formation not yet located.
has upper boundary definition: Not seen on Sheet 149.

Cinderford Member
type: Concept
in scheme: NamedRockUnit
alternative label: CIFD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40963
has lithology component: CIFD COAL
has lithology component: CIFD MDST
has lithology component: CIFD SDST
has lithology component: CIFD SLST
has source info: CIFD_49279
has source info: CIFD_50039
has source info: CIFD_52308
has obsolete equivalent: CIFD mn 923
broader: Grovesend Formation
has lower boundary definition: Taken at the base of the Brazilly Coal, which rests conformably upon thick-bedded, coarse-grained sandstone of the Coleford Member of the Pennant Sandstone Formation.
has geographical distribution: Restricted to the central part of the Forest of Dean outlier (SO 60).
has lithology description: Mainly grey mudstone and siltstone, with some reddening, coal and sandstone. The lower part of the succession is dominantly argillaceous and included relatively thick coals, including the Brazilly and Crow coals. The middle part of the member includes the Serridge Sandstone, which passes from exclusively sandstone in the north to interbedded sandstone and shale to the south. The upper argillaceous part of the member includes further coal seams (Woodgreen Coals).
has thickness description: From 180 m thick in the north, to 300 m in the south of the Forest of Dean Coalfield.
has upper boundary definition: The member is the youngest unit within the Forest of Dean outlier. The top of the member is not proved.

Cilan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CIG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CiG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40964
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40965
has lithology component: CIG SDST
has lithology component: CIG WACKE
has source info: CIG_50909
has source info: CIG_52605
has source info: CIG_52946
has obsolete equivalent: CIG mn 921
has obsolete equivalent: CIG mn 922
broader: Harlech Grits Group
has additional age information: St David?s?
has lower boundary definition: Conformably overlies manganiferous siltstones belonging to the Trwyn-y-Fulfran Formation. Boundary taken at the first coarse-grained sandstone of the Cilan Formation.
has geographical distribution: St Tudwal's Peninsula, northwest Wales.
has lithology description: Coarse-grained, thickly-bedded turbiditic sandstones.
has thickness description: 400m
has upper boundary definition: Overlain conformably by red, brown and green siltstones and subordinate sandstones of the Ceiriad Formation.

Caledonian Supersuite
type: Concept
in scheme: NamedRockUnit
alternative label: CIGSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: SS
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: CIGSS BA
has lithology component: CIGSS DI
has lithology component: CIGSS DOLR
has lithology component: CIGSS FELS
has lithology component: CIGSS FPMGN
has lithology component: CIGSS GD
has lithology component: CIGSS GDBI
has lithology component: CIGSS GN
has lithology component: CIGSS LMPY
has lithology component: CIGSS MCDI
has lithology component: CIGSS MCGN
has lithology component: CIGSS MCGNA
has lithology component: CIGSS OLHBT
has lithology component: CIGSS PEG
has lithology component: CIGSS PGGN
has lithology component: CIGSS QFP
has obsolete equivalent: CIGSS st 163
broader: NP
narrower: SDCAD
narrower: SDCAM
narrower: SDPV
narrower: Borrowdale Sill Suite
narrower: LDDMI
narrower: LDFP
narrower: LDMP
narrower: LDOMI
narrower: Cairngorm Granitic Suite
narrower: MVFEI
narrower: NEBAS
narrower: NEDI
narrower: NEDP
narrower: NEGRA
narrower: Galloway Granitic Suite
narrower: HOMI
narrower: HSO
narrower: HSY
narrower: ODMIV
narrower: UILC
narrower: LAMM
narrower: NWGRA
narrower: NWHAP
narrower: NWHIM
narrower: SHEGR
narrower: SHOC
narrower: SHOP
narrower: MANXG
narrower: SSCGR
narrower: Argyll And Northern Highlands Granitic Suite
narrower: Appinite Suite
narrower: Glencoe Caldera-Volcano Complex

Claxby Ironstone Formation And Hundleby Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CIHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KH
has lithology component: CIHC AROC
has lithology component: CIHC FEST
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Craig Hill Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CIL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40966
has lithology component: CIL BALVPW
has lithology component: CIL BAVBR
has source info: CIL_49821
has source info: CIL_50628
broader: Balcreuchan Group
has lower boundary definition: Base of the lowest breccia bed, overlying pillow lavas of the Balcreuchan Group (undivided).
has geographical distribution: Northeast of Colmonell, Ayrshire, southwest Scotland.
has lithology description: Polymict breccia of basalt, amphibolite and various granite clasts, interbedded with some basaltic pillow lavas and rare chert beds.
has thickness description: About 100m
has upper boundary definition: Top of the highest breccia bed where it is overlain by pillow lavas of the Balcreuchan Group (undivided).

Ciliau Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CILI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NP

Cinder Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CIN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
broader: NE

Cinder Bench Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CINBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CINBC COAL
broader: PLCM

Cinder Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CINC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CINC COAL
broader: PLCM

Caerfai Group
type: Concept
in scheme: NamedRockUnit
alternative label: CIS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40967
has lithology component: CIS CONG
has lithology component: CIS MDST
has lithology component: CIS SDST
has source info: CIS_48775
has source info: CIS_49922
has source info: CIS_50494
has source info: CIS_50693
has source info: CIS_50873
has source info: CIS_50885
has source info: CIS_51246
has obsolete equivalent: CIS mn 736
has obsolete equivalent: CIS mn 737
has obsolete equivalent: CIS mn 735
broader: NE
narrower: Caerfai Bay Shales Formation
narrower: SNSS
narrower: Caerbwdy Sandstone Formation
has lower boundary definition: Drawn at base of basal conglomerate of the Caerfai Group where it rests unconformably on slates and tuffs of the Ogofgolchfa Group.
has geographical distribution: South-west Wales.
has lithology description: Reddish, basal conglomerate, green, fine-grained micaceous sandstone, purple-red mudstone and purple-red micaceous sandstone.
has thickness description: 400m approx.
has upper boundary definition: Drawn at conformable upward passage from purple-red sandstone of the Caerbwdy Sandstone to coarse, pebbly sandstone of the Solva Group.

Creag Innich Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CISA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CISF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40968
has lithology component: CISA MSDST
has lithology component: CISA QZITE
has lithology component: CISA SDST
has lithology component: CISA SEMPEL
has obsolete equivalent: CISA mn 393
broader: SOHI
has lower boundary definition: Outgoing of dominantly semipelite or pelitic slaty lithologies or the outgoing of variable green to rusty weathering arenites, wackes and semipelites; incoming of cleaner, coarse-grained quartzose arenites.
has geographical distribution: Currently only defined within Sheet 38e (aberfoyle), where it occurs locally on either side of the Aberfoyle Slate and the Loch Katrine Volcaniclastic Formation in synformal folds; similar lithology known from Ben Lomond.
has lithology description: Metasandstone, arenite to quartz-arenite, grey to buff-grey, locally gritty.
has thickness description: 1300m maximum (estimated, but considered to lens out laterally)
has upper boundary definition: Incoming of variable arenite, wacke and semipelitic lithologies, and more matrix-rich rocks in general.

City Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CIT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Claxby Ironstone Formation And Tealby Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CITB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KB
has lithology component: CITB AROC
has lithology component: CITB FEST
has lithology component: CITB MDST
broader: NP

Claxby Ironstone Formation, Tealby Formation And Roach Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CITR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KB
has lithology component: CITR AROC
has lithology component: CITR FEST
has lithology component: CITR MDST
broader: NA

Chalk Group
type: Concept
in scheme: NamedRockUnit
alternative label: CK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40969
has lithology component: CK CAMDST
has lithology component: CK CHLK
has lithology component: CK FLNT
has lithology component: CK LMST
has lithology component: CK PHOST
has source info: CK_49559
has source info: CK_49628
has source info: CK_50465
has source info: CK_51748
has source info: CK_52412
has source info: CK_52586
has source info: CK_52814
has source info: CK_52824
has obsolete equivalent: CK mn 4151
broader: NP
narrower: Ekofisk Formation
narrower: LCK
narrower: MUCK
narrower: Ferriby Chalk Formation
narrower: JKES
narrower: Grey Chalk Subgroup
narrower: WBCK
narrower: WCK
narrower: WHCK
narrower: WNPCK
narrower: UCK
narrower: Burnham Chalk Formation
narrower: Herring Formation
narrower: Hidra Formation
narrower: MCK
narrower: MCKL
narrower: LMPL
narrower: RCK
narrower: Flamborough Chalk Formation
narrower: TOR
narrower: ROWE
has lower boundary definition: Generally unconformable (at a burrowed surface) on the underlying Lower Cretaceous strata (Upper Greensand and Gault Formations in the Southern Province and on the Hunstanton Formation in the Northern Province). Oversteps onto older strata in limited basin marginal situations.
has geographical distribution: The group is known throughout the onshore outcrops in England (Yorkshire to Kent, Sussex and Dorset), and offshore in the Southern Central and Northern North Sea areas.
has lithology description: Mainly chalk, some nodular or forming cemented layers, with marl seams in parts, beds of flint nodules or flint layers in the upper parts, and beds of limestone, chalky marl amd marly chalk in the lower part with glauconitic marl or sand at base.
has thickness description: The thickness of the whole group is variable depending on the degree of post-Cretaceous erosion and the relative development of its constituent formations. Onshore the thickest development is within the Hampshire/Sussex area of the Southern Province, where up to about 560m of strata are preserved; the most chronostratigraphically complete succession is in Norfolk but is thought there to be only some 400m thick; within the Northern Province up to 530m are preserved but the thickest succession is within the North Sea area where about 1000 to 1300m are preserved.
has upper boundary definition: Unconformable beneath the Palaeogene or Quaternary basal unconformity onshore in the UK. Conformable beneath Danian age Maureen Formation in parts of the North Sea. Elsewhere unconformable.

Crosskirk Bay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40970
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40971
has lithology component: CKBA LMST
has lithology component: CKBA SDST
has lithology component: CKBA SLST
has source info: CKBA_49080
has source info: CKBA_50645
has obsolete equivalent: CKBA mn 674
has obsolete equivalent: CKBA mn 1161
has obsolete equivalent: CKBA mn 44
broader: Caithness Flagstone Group
has lower boundary definition: Base of lowest medium-grained sandstone unit overlying siltstone-dominated cyclic sequence of the Dounreay Shore Formation.
has geographical distribution: Onshore and immediately offshore of the Dounreay area, Caithness, Northern Scotland.
has lithology description: Sandstone-dominated rhythmic cycles of interbedded sandstone, siltstone and calcareous laminite limestone.
has thickness description: More than 290m
has upper boundary definition: Highest unit in local stratigraphy. Top not seen.

Crackington Formation And Bude Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CKBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
has lithology component: CKBU MDST
has lithology component: CKBU MMST
has lithology component: CKBU SDST
has lithology component: CKBU SLST
broader: NE

Coking Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: CKCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CKCO COAL
broader: SWMCM

Chudleigh Knighton Clay And Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GO
has predominant age: GO
has youngest age: GO
broader: NE

Cocker Combe Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: CKCT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: NE

Crackington Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CKF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40972
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40973
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40974
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40975
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40976
has lithology component: CKF FEST
has lithology component: CKF MDST
has lithology component: CKF MMST
has lithology component: CKF SDST
has lithology component: CKF SLST
has source info: CKF_48713
has source info: CKF_48714
has source info: CKF_49279
has source info: CKF_49280
has source info: CKF_49644
has source info: CKF_49646
has source info: CKF_49647
has source info: CKF_50239
has source info: CKF_50519
has source info: CKF_50599
has source info: CKF_51557
has source info: CKF_51644
has source info: CKF_51994
has source info: CKF_52454
has source info: CKF_52501
has source info: CKF_52918
has obsolete equivalent: CKF mn 97
has obsolete equivalent: CKF mn 451
has obsolete equivalent: CKF mn 994
has obsolete equivalent: CKF mn 1097
has obsolete equivalent: CKF mn 1425
has obsolete equivalent: CKF mn 2106
has obsolete equivalent: CKF mn 2378
has obsolete equivalent: CKF mn 3126
has obsolete equivalent: CKF mn 3921
has obsolete equivalent: CKF mn 4554
has obsolete equivalent: CKF mn 4605
has obsolete equivalent: CKF mn 2021
has obsolete equivalent: CKF mn 2207
has obsolete equivalent: CKF mn 2873
has obsolete equivalent: CKF mn 4553
has obsolete equivalent: CKF mn 4555
has obsolete equivalent: CKF mn 4704
is obsolete equivalent of: CKF BEAL
is obsolete equivalent of: CKF BOSC
is obsolete equivalent of: CKF WDHO
is obsolete equivalent of: CKF SME
is obsolete equivalent of: CKF BFF
broader: HOWY
narrower: Embury Shale
narrower: IFB
narrower: Gull Rock Shale
has lower boundary definition: Due to thrusting along the south crop of the Formation, the base is seen only between Okehampton (SX 59 94) and the Teign Valley (SX 84 84), east Dartmoor, Devon. The base is gradational and taken at the incoming of more abundant and relatively thicker sandstones of the Crackington Formation above the mudstones with less than 10% sandstone in the underlying Dowhills Mudstones Formation. Between the Bideford area (SX 45 27) north Devon and the Westleigh area (ST 06 17), west Somerset, the base is taken at a similar level. However, in the Bideford area, the base needs further investigation, as the Dowhills Mudstone Formation (Limekiln Beds of Prentice 1960a) was included in the Crackington Formation by Edmonds et al. (1979).
has geographical distribution: North Cornwall (SX 15 97), Devon (SS 7010) and west Somerset (ST 06 17).
has lithology description: Rhythmically bedded, dark blue-grey mudstones and subordinate predominantly grey sandstones and siltstones. Sandstone percentage varies from 20-75%, both vertically and geographically. The sandstones are parallel-sided "Bouma-type" turbidites with abundant well-developed sole structures. Individual beds are from a few centimetres to 0.4m thick and rarely up to 1m thick. Thicker sandstones are locally present, mainly in the uppermost part, but tend to be massive and lack sole structures. Packets with abundant sandstones are commonly developed and mappable. On the north Cornwall and Devon coast, six named units of dark grey to black pyritic shale with goniatite- and fish-bearing calcareous nodules are present in the upper part of the Formation. The thickest of these units is up to 7m thick. A few thick units of slumped or destratified beds are also present in the uppermost part of the Formation, as are scattered ironstone nodules.
has thickness description: >c.1000m in the Exeter district; 250m in the Bideford area.
has upper boundary definition: On the north Cornwall and north Devon coast, the top is taken at the top of the Hartland Quay Shale, the uppermost of the named goniatite bearing mudstones in the Crackington Formation. Inland, where the Hartland Quay Shale cannot be mapped in pervasively folded terrain as it is too thin, the top is taken at the incoming of softer, more silty and argillaceous thick-bedded sandstones of the overlying Bude Formation above the dominantly thin- to medium-bedded sandstones and mudstones of the Crackington Formation. In the Bideford area the top is taken at the incoming of channels overlain by syndepositionally disturbed units and thick, locally cross-bedded, sandstones of the Westward Ho! Member of the overlying Bideford Formation above the regularly interbedded mudstones and turbidite sandstones of the Crackington Formation.

Cockhill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CKHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CKHL LMST
broader: SILS

Carganamuck Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Carrickmore Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CKMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
is obsolete equivalent of: CKMB CRKM
broader: NE

Creekmoor Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKMC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GY
has predominant age: GY
has youngest age: GY
has lithology component: CKMC CLAY
broader: POOL
narrower: SCKM

Cockermouth Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CkmL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40977
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40979
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40978
has lithology component: CKML AND
has lithology component: CKML BAOP
has source info: CKML_49423
has source info: CKML_50007
has source info: CKML_50536
has source info: CKML_52972
has obsolete equivalent: CKML mn 992
has obsolete equivalent: CKML mn 993
broader: RVS
has lower boundary definition: Taken at base of lowest basalt sheet that conformably overlies conglomerate of the Marsett Formation; the formation oversteps the eastwards, unconformably to overlie the Skiddaw and Eycott groups.
has geographical distribution: Northern margin of Lake District Lower Palaeozoic massif, from just west of Cockermouth to Bothel (wholly on sheets E22 and E23). Intrusions of microgabbro ("dolerite") and lapilli-tuff on Little Mell Fell (E30 Appleby) may be intrusive equivalents of the Cockermouth Volcanic Formation (Macdonald and Walker, 1985).
has lithology description: Olivine-phyric basalt and tholeiitic andesite. Up to four sheets of massive to intensely amygdaloidal and scoriaceous rock, dark blue-grey to grey. Interpreted to be lavas. No intercalated pyroclastic or sedimentary rocks are present.
has thickness description: 105m in the Cockermouth area, thinning to 30m near Sunderland; 67m thick in the type section.
has upper boundary definition: Conformably overlain by interbedded mudstone, sandstone and thin limestone of the Marsett Formation.

Creekmoor Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKMS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CKMS SANDU
broader: POOL

Clackmannan Group
type: Concept
in scheme: NamedRockUnit
alternative label: CKN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CKN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40980
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40981
has lithology component: CKN COAL
has lithology component: CKN FEST
has lithology component: CKN LMST
has lithology component: CKN MDST
has lithology component: CKN SDST
has lithology component: CKN SEATS
has lithology component: CKN SLST
has source info: CKN_50632
has source info: CKN_51146
broader: NA
narrower: Enterkin Mudstone Formation
narrower: LCUL
narrower: DLST
narrower: MKS
narrower: LLGS
narrower: PGP
narrower: ULGS
narrower: LSC
has additional age information: Mostly Namurian but ranges from Brigantian to early Langsettian.
has lower boundary definition: Drawn at base of lowest limestone of the Lower Limestone Formation; normally conformable.
has geographical distribution: Midland Valley of Scotland.
has lithology description: Sequences of sandstones, siltstones, mudstones, limestones, ironstones, coals and seatrocks; commonly cyclic; marine faunas common in lower parts of cycles.
has thickness description: Up to about 1500m.
has upper boundary definition: Drawn at conformable upward passage from Passage Formation to Lower Coal Measures.

Carrick O'Hara Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKOH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Easdale Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Chalk Rock Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CkR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40982
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40983
has lithology component: CKR CAMDST
has lithology component: CKR CHLK
has source info: CKR_48684
has source info: CKR_49081
has source info: CKR_49272
has source info: CKR_51608
has obsolete equivalent: CKR mn 866
has obsolete equivalent: CKR mn 865
broader: UCK
has additional age information: Turonian. Sternotaxis plana (now Plesiocorys plana) Zone.
has lower boundary definition: The diffuse lower limit of cementation of the lowest bed of chalkstone at this level.
has geographical distribution: Known throughout the Southern Province and in the Chiltern area of the Transitional Province, eastwards to south Norfolk.
has lithology description: Very hard chalk and chalkstone, some nodular, including mineralised hardground surfaces, and marl seams.
has supplementary information: Although Bromley and Gale's (1982) definition of the Chalk Rock is accepted, it is BGS practice to include the unit in the Upper Chalk. As the Upper Chalk has 'formation' status, the Chalk Rock is reduced in rank from 'formation' (Bromley and Gale, 1982) to 'member'. This should be re-appraised if the 'Upper Chalk Formation' is redefined formally. NOTE 2. Gale, Wood and Bromley (1987) treat the Chalk Rock as a Member of the 'White Chalk Formation' (= Middle and Upper Chalk of BGS).
has thickness description: About 0.5m up to 4 to 5m where fully developed.
has upper boundary definition: "Where the Hitch Wood Hardground is developed, ... at the flint nodule horizon that marks the base of the overlying nodular chalk unit". In other areas, at the Pewsey Hill Hardground or the Ogbourne Hardground.

Cock Rig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CKRI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CKRI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40985
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40986
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40984
has lithology component: CKRI CONG
has lithology component: CKRI CSSST
has lithology component: CKRI MDST
has lithology component: CKRI SDST
has source info: CKRI_48654
has source info: CKRI_49222
has source info: CKRI_49223
has source info: CKRI_49784
has source info: CKRI_50454
has source info: CKRI_51092
has source info: CKRI_51262
has source info: CKRI_51491
has obsolete equivalent: CKRI mn 343
has obsolete equivalent: CKRI mn 344
has obsolete equivalent: CKRI mn 352
has obsolete equivalent: CKRI mn 4435
has obsolete equivalent: CKRI HGC
broader: NSK
has lower boundary definition: Conformable on Deerhope Formation: Lowest pinkish-grey medium- to coarse-grained sandstone.
has geographical distribution: Pentland Hills, Midland Valley.
has lithology description: Medium- and coarse-grained, locally flaggy, cross-stratified sandstones, interbedded with clast-supported and poorly graded conglomerates.
has thickness description: 80-97m
has upper boundary definition: Conformable: highest olive medium-grained sandstone below grey-green mudstones of the Wether Law Linn Formation.

Chalky Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
broader: NE

Chalk Silt
type: Concept
in scheme: NamedRockUnit
alternative label: CKSL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Cuckfield Stone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CkSt
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: KV
has predominant age: KV
has youngest age: KV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40987
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40989
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40990
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40991
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40992
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40988
has lithology component: CKST CALSST
has lithology component: CKST LMST
has lithology component: CKST MDST
has source info: CKST_48995
has source info: CKST_50660
has source info: CKST_52385
has obsolete equivalent: CKST mn 1175
broader: TWS
has lower boundary definition: Down-section change from fine-grained, silty, cross-bedded, buff sandstone with local thin mudstones and limestones [Cuckfield Member] to mudstone [Grinstead Clay Formation]. Locally, e.g. near Skaynes Hill, the Lower Grinstead Clay Member is cut out and fine-grained, silty, cross-bedded [festoon bedded], buff, calcareous sandstone [Cuckfield Stone Member] rests directly on fine-grained, pale grey to white, cross-bedded, soft, quartz sandstone [Ardingley Member of the Lower Tunbridge Wells Sand Formation].
has geographical distribution: The Cuckfield Member occurs in much of Horsham, including around Cuckfield, Drewitts and Ardingley. It disappears northwest of an arc from Handcross to Turners Hill and to the south of East Grinstead [Gallois and Worssam, 1993]. It can also be traced into the Royal Tunbridge Wells district from Turner's Green to the area east of Greenhurst [east of Maresfield] and between East Grinstead to Royal Tunbridge Wells. The member has also been identified in a small area in the northeastern corner of sheet 318, north of Burgess Hill.
has lithology description: Fine-grained, silty, cross-bedded, buff, calcareous sandstone with thin mudstones and limestones locally. In some areas, for example, in the Scayne's Hill-Chailey area, the Lower Grinstead Clay Member thins and disappears and the Cuckfield Stone Member expands with "sandrock" comprising the upper part of the member and festoon-bedded sandstone in the lower part of the member.
has thickness description: To 8.3m
has upper boundary definition: Down-section change from shales and clay-ironstone beds [Grinstead Clay Formation] with a basal pebble bed [Cuckfield Pebble Bed] to fine-grained, silty, cross-bedded, buff sandstone with local thin mudstones and limestones [Cuckfield Stone Member].

Cockley Beck Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CkT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40993
has lithology component: CKT DALTUF
has lithology component: CKT DATUF
has source info: CKT_50725
has source info: CKT_50920
broader: Birker Fell Andesite Formation
has lower boundary definition: Base of garnetiferous, dacitic lapilli-tuff. Unconformable, in type area overlies volcaniclastic breccia and sandstone (Dale Head Member); elsewhere overlies a variety of basaltic, andesitic and dacitic lava.
has geographical distribution: Duddon Valley - Eskdale; Cockley Beck to Dale Head and Foxbield Moss, Cumbria.
has lithology description: Garnetiferous eutaxitic dacitic lapilli-tuff with thin interbedded laminated garnetiferous tuff locally.
has thickness description: 0 to 60m
has upper boundary definition: Overlain by a variety of lavas that range in composition from basaltic andesite to dacite, and locally overlain by valcaniclastic sandstone.

Cockley How Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CKY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cky
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40994
has lithology component: CKY DALTUF
has source info: CKY_49453
broader: Deepdale Sandstone Formation
has lower boundary definition: Most distinct where basal parataxitic lapilli-tuff rests on bedded sandstone (Deepdale Sandstone Formation).
has geographical distribution: Confined to areas south and east of Deepdale Park, Deepdale, northeastern Lake District (between Grasmere and Patterdale).
has lithology description: Dacitic ignimbrite in the form of massive lapilli-tuff but with a lithologically distinct basal layer of parataxitic lapilli-tuff.
has thickness description: 45m (maximum)
has upper boundary definition: Indistinct, but overlain by bedded sandstone (Deepdale Sandstone Formation).

Carboniferous Limestone Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: CL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CL
has revision number: 0
has rock unit rank: SG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40995
has lithology component: CL ANHY
has lithology component: CL BA
has lithology component: CL DOLO
has lithology component: CL LMST
has lithology component: CL MDST
has lithology component: CL TUF
has lithology component: CL VCBR
has source info: CL_49279
has obsolete equivalent: CL mn 780
broader: NA
narrower: HOHI
narrower: PEMB
narrower: PKLM
narrower: Clwyd Limestone Group
narrower: Great Scar Limestone Group
narrower: Bowland High Group
narrower: Avon Group
narrower: TRLI
narrower: RVGS
has lower boundary definition: Typically rests with an angular unconformity above Lower Palaeozoic or older strata. Where the base of the limestone or dolostone succession rests directly upon the unconformity, the unconformity marks the base at the supergroup. Locally, red sandstones or conglomerates with common calcrete palaeosols or bedded and nodular anhydrite with subordinate dolostone and mudstone occur immediately above the uncomformity. In other circumstances the comformable base of the Supergroup is taken at the base of the lowermost bed of limestone or dolostone above a predominant succession of sandstone, conglomerate or anhydrite.
has geographical distribution: Extensive across England and Wales, including south and west Cumbria, the Yorkshire Dales, North and South Wales, the Peak District and the Bristol area.
has lithology description: Dominated by typically bioclastic to micritic, bioturbated with common shelly, crinoidal and algal beds of limestone and coral biostromes which are darker grey, and commonly dolomitised in the lower part. The upper part is dominated by paler grey, thinner-bedded limestones with common palaeokarst surfaces, overlain by clay wayboards, which are possible weathered bentonites. Sandstone is locally common, particularly in the upper part of the Supergroup.
has thickness description: The Supergroup comprises a single group in each tectonic province, and hence thickness is the same as for each component group; e.g. Peak Limestone Group about 800m in the Peak District, the Great Scar Limestone Group attains about 800m in northern England, and the thickest development is in the Stainmore Trough [NY]. The Clwyd Limestone Group of North Wales [SH and SJ] measures up to 900m.
has upper boundary definition: Typically a sharp conformable boundary with the top of the uppermost limestone bed succeeding a predominantly limestone-dominated succession, overlain by dark grey mudstone of the Craven Group, quartzitic sandstone of the Tenby Group, sandstone, or dark grey mudstone and dark grey, thinly bedded limestone of the Yoredale Group.

Clayknowes Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: CLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLA COAL
broader: MCMS

Clachghlas Granite
type: Concept
in scheme: NamedRockUnit
alternative label: CLACH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SH
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CLACH MIR
has obsolete equivalent: CLACH mn 1397
broader: PCGRA
has additional age information: ?600 Ma.

Claerwen Group
type: Concept
in scheme: NamedRockUnit
alternative label: CLAE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has lithology component: CLAE MDHLM
has lithology component: CLAE MDST
broader: NE
narrower: Derwenlas Formation
narrower: RHS

Clachaig Semipelite And Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40996
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40997
has lithology component: CLAG PSAMI
has lithology component: CLAG PSAMM
has lithology component: CLAG QZITE
has lithology component: CLAG SEMPEL
has lithology component: CLAG SPELGN
has source info: CLAG_51263
has source info: CLAG_51925
broader: Glen Spean Subgroup
narrower: MCCH
has lower boundary definition: Change from graded beds of feldspathic and micaceous psammite of the Creag Meagaidh Formation up into semipelite-dominated succession.
has geographical distribution: Southern Monadhliath Mountains. On sheet 63W and 63E in an arc extending from west of Creag Meagaidh around [NN 385 875] through Meall Cos Charnan [NN 432 774] to Creag Pitridh [NN 485 810] with another occurrence in Coire Sgoir [NN 493 740], NNEfor 6km.
has lithology description: Schistose to locally gneissose semipelite with interbeds of micaceous psammite and feldspathic psammite. Locally interbanded psammite and semipelite in places on a few centimetres scale.
has thickness description: 0 to 580m generally. Locally up to 820m although this may be tectonically thickened.
has upper boundary definition: Transitional contact into psammites and quartzites of the overlying Inverlair Psammite Formation.

Clair Group
type: Concept
in scheme: NamedRockUnit
alternative label: CLAI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CL
has source info: CLAI_51880
broader: NE

Clach Alasdair Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLAL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: NE

Clashindarroch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40998
has lithology component: CLAS HNFELS
has lithology component: CLAS PEL
has lithology component: CLAS PSAMG
has lithology component: CLAS PSAMM
has lithology component: CLAS QZITE
has lithology component: CLAS SCH
has lithology component: CLAS SEMPEL
has source info: CLAS_49798
has obsolete equivalent: CLAS mn 3205
broader: SOHI
narrower: Garnel Burn Pelite Member
has lower boundary definition: Above Blackwater Formation at base of highly magnetic biotite-andalusite-schist easily mapped and/or traced by magnetometer between NJ 405 312 and NJ 441 351 (the Garnel Burn Pelite Member).
has geographical distribution: South eastern corner of Sheet 85E and southern margins of Sheets 86N and 86E north of the Boganclogh and Insch Basic Intrusions.
has lithology description: Phyllitic semipelite and pelite, represented by andalusite-cordierite schist in part with rare quartzite and psammite.
has thickness description: Unknown
has upper boundary definition: Boundary with overlying Macduff Formation, where the more semipelitic and pelitic lithologies give way to more psammitic lithologies with grits and conglomerates. Imprecise boundary, probably transgressive.

Claughton Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLAU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Clau
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41000
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41001
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41002
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40999
has lithology component: CLAU SDST
has lithology component: CLAU SLST
has source info: CLAU_48721
has source info: CLAU_49288
has source info: CLAU_50556
has lateral equivalent: CLAU st 187
has lateral equivalent: CLAU st 188
has lateral equivalent: CLAU st 453
has lateral equivalent: CLAU st 590
has lateral equivalent: CLAU NOT
has obsolete equivalent: CLAU mn 931
has obsolete equivalent: CLAU mn 930
broader: SILS
narrower: MOCS
narrower: Crossdale Grit
narrower: Barncroft Beck Beds
narrower: HHO
narrower: Claughton Moor Siltstones
narrower: NOT
has lower boundary definition: Sharp junction between fossiliferous fissile clayey blue-grey mudstones with limestone nodules and thin sideritic lenses of Caton Shale Member below and siltstones with sandstones of the Claughton Member.
has geographical distribution: Lancaster Fells. Moseley (1956) used Keasden Flags for the same unit in the Keasden area. Used in the Settle Memoir but not defined. Keasden Flags is a synonym for Claughton Member.
has lithology description: Typical delta slope facies. Predominantly sandy grey micaceous shaly siltstones with irregular interbeds of fine- to medium-grained micaceous plant-rich sandstone, very variable thickness and bedding commonly syndepositionally slumped. NOTE: Moseley named the delta slope sequence between the entirely marine Caton Shales and the delta top Crossdale Grit (now Silver Hills Sandstone), the Claughton Flags. Thus it is proposed to rename the unit Claughton Member since it is predominantly siltstone and is analogous to the Roeburndale Member below the Caton Shale Member.
has thickness description: c.200-300m in the Claughton area, but upper part not represented.
has upper boundary definition: Not seen; believed to be sharp, at erosional base of delta-top coarse-grained sandstone of the Silver Hills Sandstone.

Clavellata Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLAV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ClB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41004
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41003
has lithology component: CLAV CAMDST
has lithology component: CLAV LMOOL
has lithology component: CLAV LMST
has lithology component: CLAV SANDU
has source info: CLAV_49329
has source info: CLAV_49330
has source info: CLAV_49894
has source info: CLAV_51634
has source info: CLAV_52116
has source info: CLAV_52641
has source info: CLAV_52956
has obsolete equivalent: CLAV mn 4263
has obsolete equivalent: CLAV st 189
broader: Corallian Group
narrower: Eccliffe Member
has lower boundary definition: Usually a coarse shelly oolite, resting (locally with angular discordance) on fine, evenly graded oolite of the Todber Freestone (where present), or on clay and sandy clay of the Newton Clay.
has geographical distribution: From the middle of the Wincanton Sheet (297), southwards across the whole of the Shaftesbury Sheet (313). Almost certainly it is the same as the Trigonia Clavellata Beds of the Dorset coast.
has lithology description: Variable from bioclastic oolite, fine- to medium-grained oolite, biomicrite, with thin beds of marl, sandy marl and fine-grained sand.
has thickness description: 3 - 7m
has upper boundary definition: Fairly abrupt change to sandy clays and clayey sands of the Sandsfoot Formation.

Clay Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CLAY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CLAY COAL
has lateral equivalent: CLAY st 368
broader: SWMCM

Clarborough Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TD
has predominant age: TD
has youngest age: TD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41005
has lithology component: CLB DSDST
has lithology component: CLB DSLST
has lithology component: CLB GYPST
has lithology component: CLB MDST
has source info: CLB_48671
has source info: CLB_48839
has source info: CLB_49699
has source info: CLB_51674
has obsolete equivalent: CLB mn 925
has obsolete equivalent: CLB mn 926
broader: SIM
has lower boundary definition: Conformable, at gradational upward passage from reddish-brown mudstone of the underlying Sidmouth Mudstone Formation (undivided) to the more strongly indurated, silty gypsiferous mudstone of the Clarborough Member.
has geographical distribution: Surface outcrop limited to north Nottinghamshire, East Retford area.
has lithology description: Mudstone, silty, reddish brown with common veins of satin spar gypsum and indurated beds of reddish brown or greenish grey siltstone and very fine-grained sandstone, dolomitic.
has thickness description: 3 to 12m
has upper boundary definition: Conformable, at gradational upward passage from the more strongly indurated, silty gypsiferous mudstone of the Clarborough Member to the reddish-brown mudstone of the overlying Sidmouth Mudstone Formation (undivided)

Clackmannan Blackband
type: Concept
in scheme: NamedRockUnit
alternative label: CLBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Cleaver Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLBK
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Cloghastucan Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41006
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41008
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41007
has lithology component: CLC CHLK
has lithology component: CLC FLNT
has lithology component: CLC LMST
has source info: CLC_50224
has source info: CLC_52106
has source info: CLC_52212
has obsolete equivalent: CLC mn 963
has obsolete equivalent: CLC mn 2773
broader: UWLF
has additional age information: Santonian. Marsupites testudinarius Zone.
has lower boundary definition: At the type site boundary is at a prominent bedding plane immediately above a wavy bedded unit at the top of the underlying Galboly Chalk Formation. Outside the type area the basal contact is disconformable and the junction is marked by an erosion surface with glauconitised chalk pebbles, which includes rolled sponge psuedomorphs.
has geographical distribution: Present in the North Antrim and East Antrim basins and parts of the Highland Border and Southern Uplands areas. Absent over the Londonderry shelf.
has lithology description: Limestone (chalk), with an overall "gritty" texture and with some flint bands (mainly small and "spindle-shaped") most notably the coalescing nodular flint course termed the Oweynamuck Flint Band (of bed status defined at the eastern bluff in White Park Bay [D 029 448]). Beds of green-coated chalk pebbles at some levels. Common brachials and calyx plates of Marsupites.
has thickness description: Thin succession of 2.33m thickness at its type-site. Absent over structural highs and overlapped by succeeding member.
has upper boundary definition: The upper limit is taken at the top of a thin (0.15m) wavy bedded unit underlying Creggan Chalk Formation chalks rich in Inoceramus debris. The wavy bedded unit contains a marked increase in Inoceramus compared to the rest of the Cloghastucan Chalk Formation.

Cumbria-Lancashire Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CLCA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41009
has lithology component: CLCA C
has lithology component: CLCA P
has lithology component: CLCA S
has lithology component: CLCA V
has lithology component: CLCA Z
has source info: CLCA_50596
has source info: CLCA_51617
has obsolete equivalent: CLCA mn 4088
has obsolete equivalent: CLCA LTHM
broader: Britannia Catchments Group
narrower: Ehen Alluvium Formation
narrower: Cumbrian Esk Valley Formation
narrower: WYRV
narrower: LUNV
narrower: RIBV
narrower: Blelham Peat Formation
has lower boundary definition: Probably unconformable and in places strongly incised into highly variable sediments of the Caledonia or Albion Glacigenic groups and bedrock.
has geographical distribution: West and south Cumbria and Lancashire: the westerly and southerly catchments of the Lake District and Lancashire west of the Pennines between Whitehaven and Liverpool, including the catchments of the river valleys and their tributaries of the Rivers Lune, Wyre, Ribble, Ehan and Esk.
has lithology description: Alluvial silt, sand, clay and gravel with some peat. Associated River Terraces are dominated by sand and gravel, gravelly sand or sandy gravel with rare clay and silt.
has thickness description: Highly variable depending on the relative stratigraphical positions of each of the component units. In the major river valleys the thickness may vary between 2 and 5m, but probably does not exceed 10m. For deposits flanking the major river valleys, the thickness probably varies between 1 and 3m.
has upper boundary definition: Ground surface or unconformable below artificial deposits.

Clock's Cleuch Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CLCC COAL
broader: Border Group

Caley Crags Grit
type: Concept
in scheme: NamedRockUnit
alternative label: CLCG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: CLCG SDST
broader: MG
has geographical distribution: West Yorkshire [Caley Crags, 1.5 miles southeast of Otley].

Cleeve Cloud Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ClC
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41011
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41012
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41010
has lithology component: CLCL LMOOL
has lithology component: CLCL LMST
has source info: CLCL_48756
has source info: CLCL_48908
has source info: CLCL_48920
has source info: CLCL_49459
has source info: CLCL_49479
has source info: CLCL_49480
has source info: CLCL_49481
has source info: CLCL_49484
has source info: CLCL_50324
has source info: CLCL_50541
has source info: CLCL_50680
has source info: CLCL_51126
has source info: CLCL_51129
has source info: CLCL_51200
has source info: CLCL_51957
has source info: CLCL_52431
has source info: CLCL_52685
has source info: CLCL_53048
has obsolete equivalent: CLCL mn 1251
has obsolete equivalent: CLCL mn 1252
has obsolete equivalent: CLCL mn 2123
has obsolete equivalent: CLCL mn 3210
has obsolete equivalent: CLCL mn 3235
has obsolete equivalent: CLCL mn 4611
has obsolete equivalent: CLCL mn 4708
has obsolete equivalent: CLCL mn 2581
has obsolete equivalent: CLCL mn 4714
has obsolete equivalent: CLCL CRKY
has obsolete equivalent: CLCL mn 1250
has obsolete equivalent: CLCL mn 1649
broader: Birdlip Limestone Formation
has additional age information: Murchisonae Zone
has lower boundary definition: Upward change from pisoidal limestones (Crickley Member) or ferruginous, sandy, muddy limestone (Leckhampton Member) into limestone as described in lithology.
has geographical distribution: Mid and north Cotswolds: north of Horton, south Gloucestershire, and west of Fairford, Stow-on-the-Wold and Moreton-in-Marsh, Gloucestershire (Barron, A J M, et al, 1997, fig.4).
has lithology description: Off-white to pale brown well-sorted medium-, coarse- and very coarse-grained oolite grainstone, well bedded and cross-bedded; burrowed and sparsely shell-detrital in parts, locally (in east and north) yellowish and sandy.Locally highly shell detrital in lower part.
has thickness description: Type section (Leckhampton Hill); c.25m. Maximum; 51m (British Geological Survey Cleeve Common Borehole) (Barron, A J M, 1999).
has upper boundary definition: Limestone as described in lithology with sharp top, commonly a hardground, overlain by Scottsquar Member or hardground overlain by Salperton Limestone Formation.

Cockleshell Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: CLCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CLCO COAL
has lateral equivalent: CLCO TRC
has lateral equivalent: CLCO st 855
broader: PLCM

Clydach Valley Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CLD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41013
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41014
has lithology component: CLD DOLO
has lithology component: CLD LMOOL
has source info: CLD_48805
has source info: CLD_51233
has obsolete equivalent: CLD mn 971
has obsolete equivalent: CLD OGP
has lateral equivalent: CLD ABO
broader: PEMB
narrower: SYCN
narrower: Gilwern Oolite Formation
narrower: PWCO
narrower: PYDN
narrower: Coed Ffyddlwn Formation
narrower: Blaen Onnen Oolite Formation
narrower: Blaen Onnen Oolite [Obsolete Code: Use Blo]
has lower boundary definition: The base is placed at the base of the lowest bed of fine-grained dolostone (of the Sychnant Dolomite Formation), where there is a conformable, interdigitating gradation from the mudstones of the underlying Cwmynyscoy Mudstone Formation.
has geographical distribution: In a narrow outcrop around the northeast and east crops of theSouth Wales Coalfield, extending from about 2km north of the Clydach valley [SO 219 142] south to the Pontypool area. [c.ST 280 985].
has lithology description: Massive ooidal grainstones with interbedded fine-grained, thinly bedded dolostones.
has thickness description: 20m in the type area of the Clydach valley [SO 225 125] to 60m near Pontypool [SO 289 015].
has upper boundary definition: The top is a major, regionally developed palaeokarstic surface that truncates the massive, pale grey ooidal grainstone of the Gilwern Oolite Formation. It is unconformably overlain by grey, micritic limestones and green clays (Clydach Halt Member) at the base of the Llanelly Formation, which comprises mainly well-bedded, cyclical micrite to grainstone limestones with green clay interbeds.

Clackmannan Diamond Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLDC
has current status: CURRENT
has theme: BEDRCK
notation: CLDS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLDC COAL
broader: MCMS

Clydach Halt Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLDH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41015
has lithology component: CLDH CLAY
has lithology component: CLDH CONG
has lithology component: CLDH DOLO
has lithology component: CLDH LMST
has lithology component: CLDH SDST
has source info: CLDH_49692
has source info: CLDH_51233
broader: LLY
has additional age information: ?Arundian.
has lower boundary definition: The base is placed at the base of green claystone and rubbly limestones (calcretes), where they overlie and infill an irregular palaeokarstic surface at the top of the underlying Gilwern Oolite Formation.
has geographical distribution: Northeast crop of the South Wales Coalfield, with sporadic development or preservation from Pontsticill, as seen in Baltic Quarry [SO 0659 1184] and Odynau Tyler Bont Quarry [SO 0635 1125], east to the Gilwern Hill area [c.SO 250 117].
has lithology description: A heterolithic, lenticular unit of conglomerates, limestone layers and nodules, green clays and sandstones with some dolostones.
has thickness description: Generally up to 1 to 2m, 6m locally; 4m at the type locality [SO 235 127].
has upper boundary definition: The top is placed at the incoming of well-bedded, thinly bedded, cyclic limestones (the Chelternham Limestone Member), where the basal bed of limestone sharply overlies the topmost green clay or rubbly limestone of the Clydach Halt Member.

Claddens Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: CLDY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: CU
has youngest age: CU
broader: Central Scotland Late Carboniferous Tholeiitic Dyke Swarm

Clent Formation And Enville Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CLEB
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CLEB BREC
has lithology component: CLEB MDST
has lithology component: CLEB PESST
has lithology component: CLEB SDST
broader: NA
has lithology description: See the Lithology descriptions for the component formations.

Clement Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CLEM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CLEM COAL
broader: LLFB

Clun Forest Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NP

Clune Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CLFB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
broader: NE

Cliff Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CLFC
has current status: CURRENT
has theme: BEDRCK
notation: CD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has lithology component: CLFC COAL
has obsolete equivalent: CLFC st 196
has lateral equivalent: CLFC st 196
broader: NE

Clackmannan Four Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLFF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLFF COAL
broader: MCMS

Clackmannan Forty Inch Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLFI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLFI COAL
broader: NE

Cliffe Flints
type: Concept
in scheme: NamedRockUnit
alternative label: CLFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Claisfearn Semipelite
type: Concept
in scheme: NamedRockUnit
alternative label: CLFN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: AL
has lithology component: CLFN QZITE
has lithology component: CLFN SPSCH
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/L

Corsewall Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41016
has lithology component: CLG CONG
has lithology component: CLG SLST
has lithology component: CLG WACKE
has source info: CLG_49412
has source info: CLG_50582
has source info: CLG_52489
has obsolete equivalent: CLG mn 1066
broader: TAP
narrower: Glen App Conglomerate Member
narrower: Corsewall Point Conglomerate Member
narrower: Finnarts Conglomerate Member
has lower boundary definition: Not seen (Faulted: Glen App fault west of Loch Ryan).
has geographical distribution: Southern Uplands, south Scotland.
has lithology description: Boulder conglomerate and wacke turbidite unit.
has thickness description: c.1700m
has upper boundary definition: Not seen (faulted).

Claygate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLGB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLGB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41017
has lithology component: CLGB CLAY
has lithology component: CLGB MDST
has lithology component: CLGB SANDU
has lithology component: CLGB SDST
has lithology component: CLGB SILT
has source info: CLGB_48733
has source info: CLGB_48734
has source info: CLGB_48735
has source info: CLGB_49296
has source info: CLGB_49304
has source info: CLGB_49861
has source info: CLGB_52161
has source info: CLGB_52519
has source info: CLGB_52645
has obsolete equivalent: CLGB mn 944
has obsolete equivalent: CLGB mn 3226
broader: LC
has lower boundary definition: Drawn at base of lowest fine-grained sand bed, conformable on silty clay.
has geographical distribution: London Basin.
has lithology description: Interbedded fine-grained sand, silt and clay.
has thickness description: Average thickness of 16m in London area; 17m to 25m in Essex.
has upper boundary definition: Drawn at conformable upward passage from silt and fine-grained sand of the Claygate Member to the Bagshot Formation.

Cloghan Hill Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLGH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CLGH LMST
has lithology component: CLGH MDST
has lithology component: CLGH SILT
broader: Dartry Limestone Formation
has lower boundary definition: Lower boundary with Knockmore Member, marked by incoming of shales and shaly limestone.
has geographical distribution: Not defined.
has lithology description: At base comprises small mud mounds and enveloping shales, silts and bioclastic shaly limestone, overlain by interbedded shales, silts and thin limestones, overlain to the top by thin-bedded, non-shaly limestones with coral bioherms and unfossiliferous small mud mounds.
has thickness description: c 30 metres in type section; up to 50 metres to west of type section.
has upper boundary definition: Upper contact is with bedded argillaceous cherty limestone of Dartry Limestone Formation.

Cloghany Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CLGL LMST
has source info: CLGL_52960
broader: Dartry Limestone Formation
has lower boundary definition: Lower boundary is abrupt contact with poorly fossiliferous and cherty argillaceous limestones of Dartrey Formation.
has geographical distribution: Not defined.
has lithology description: Highly bioclastic, crinoidal microspar grainstone.
has thickness description: 0.97 metres in type section. Range 0.56 - 1.25 metres.
has upper boundary definition: Upper contact is base of lowest shale of succeeding Carn Limestone Member.

Cloughton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41019
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41018
has lithology component: CLH COAL
has lithology component: CLH FGSST
has lithology component: CLH LMOOL
has lithology component: CLH LMPIS
has lithology component: CLH MDST
has lithology component: CLH SDST
has lithology component: CLH SEATM
has lithology component: CLH SLST
has source info: CLH_48893
has source info: CLH_49205
has source info: CLH_49456
has source info: CLH_49457
has source info: CLH_50029
has source info: CLH_50030
has source info: CLH_50791
has source info: CLH_50865
has source info: CLH_51539
has source info: CLH_51696
has source info: CLH_51768
has source info: CLH_52140
has obsolete equivalent: CLH mn 2844
has obsolete equivalent: CLH mn 2851
has obsolete equivalent: CLH mn 2843
has obsolete equivalent: CLH mn 2850
broader: RAG
narrower: LEBB
narrower: SYCM
narrower: Gristhorpe Member
has lower boundary definition: The lower boundary is conformable, or disconformable, at the abrupt upward transition from the fossiliferous mudstone and ripple laminated sandstones of the upper part of the Eller Beck Formation to the cross-stratified, plant debris-rich sandstones, siltstones and mudstones of the Cloughton Formation.
has geographical distribution: North Yorkshire Moors, Cleveland Hills and Howardian Hills; well exposed in several coastal cliff sections between Hawsker Bottoms (northwest of Robin Hood's Bay) and Gristhorpe Bay, southeast of Scarborough. South of the Howardian Hills the unit is truncated by the unconformity at the base of the Chalk. Equivalent strata in Humberside and Lincolnshire are dominated by limestones (Cave Oolite and Lincolnshire Limestone, Cope et al., 1980). Offshore, the formation is equivalent, in part, to the Strangways Formation of the West Sole Group (Lott and Knox, 1994).
has landform description: Forms steep cliffs on the North Yorkshire Coast, and generally steep slopes on the escarpments of the North Yorks Moors, and a positive topographical feature in the Hambleton and Howardian Hills, especially where sandstone dominated. Mudstone units generally form topographical slacks.
has lithology description: The lower and upper parts of the formation (Sycarham and Gristhorpe members respectively) are dominated by planar laminated grey mudstones and siltstones with yellowish grey, fine- to medium-grained, cross-stratified sandstones. Plant remains and rootlets are common in both members, with rare thin coals, and grey mudstone seatearths. Mudstones, ferruginous sandstones and ooidal limestones with a marine macrofossil and trace fossil assemblage occur in the middle part of the formation, differentiated as the Lebberston Member (Hemingway and Knox, 1973) and also known formerly as the Whitwell Oolite and/or the Millepore Bed.
has supplementary information: Hemingway and Knox (1973) erected a second marine unit termed the Blowgill Member, comprising mudstone and limestone, at the base of the Cloughton Formation. This was subsequently shown to be part of the underlying Eller Beck Formation, and not a member of the Cloughton Formation (Powell and Rathbone, 1983).
has thickness description: 50 to 70m on the North Yorkshire Coast between Whitby and Scarborough and inland in the North Yorkshire Moors and Cleveland Hills; 36 to 50m (thinning southwards) on the western escarpment of the North Yorkshire Moors (Frost, 1998; Powell et al., 1992).
has upper boundary definition: The upper boundary is conformable, at the abrupt transition from the sandstones, siltstones and mudstones with rootlets and plant remains of the upper part of the Cloughton Formation, to the bioturbated and fossiliferous, variably calcareous mudstones, siltstones and fine-grained sandstones, and limestone of the lower part of the Scarborough Formation.

Clent Formation And Haffield Breccia Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CLHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CLHB BREC
has lithology component: CLHB MDST
has lithology component: CLHB PESST
has lithology component: CLHB SDST
broader: WAWK
has lithology description: See the Lithology descriptions for the component formations.

Cloud Hill Dolostone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CHD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41022
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41021
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41020
has lithology component: CLHD CAMDST
has lithology component: CLHD DLMDM
has lithology component: CLHD DOLO
has lithology component: CLHD LMST
has lithology component: CLHD MDST
has lithology component: CLHD SLST
has source info: CLHD_50020
has source info: CLHD_50023
has source info: CLHD_51011
has source info: CLHD_51628
has source info: CLHD_52211
has obsolete equivalent: CLHD mn 966
has obsolete equivalent: CLHD mn 778
broader: PKLM
narrower: SCBR
narrower: Cloud Wood Member
has lower boundary definition: The lower boundary is an unconformity, possibly in part a shear surface, with biosparites and micrites of the Milldale Limestone Formation of early Asbian age below, locally marked by the incoming of mudstone-dominated sediments, such as the Cloud Wood Member, and may be crowded with Thallasinoides trace fossils.
has geographical distribution: The outcrop is restricted to inliers at Barrow Hill, Cloud Hill and Breedon Hill across south Derbyshire and north-west Leicestershire; the subcrop extends at least to the Ticknall area [SK 35 24].
has lithology description: Grey, pale buff and reddish grey, fine- to coarse-crystalline, thin to very thickly bedded dolostones, with shaly mudstone or clay partings and beds. Bioclastic grainstones interbedded with mudstones and dolostones are defined as the Cloud Wood Member, calcareous mudstones seen where undolomitised. The mudmound reef dolostones are typically buff to grey, massive, fine-grained and fossiliferous with common brachiopods, crinoids, corals, gastropods, nautiloids and ammonoids.
has thickness description: At least 125 m thickness proved at type section.
has upper boundary definition: The top is taken at the incoming of the first palaeosol of friable siltstone and sandstone, displaying carbonate nodules of the overlying Ticknall Limestone Formation.

Cliffe Hardground
type: Concept
in scheme: NamedRockUnit
alternative label: CLHG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Clift Hills Phyllitic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CLHI SEMPEL
has obsolete equivalent: CLHI mn 959
broader: Clift Hills 'Division'
narrower: Dales Voe Grit Member

Clitheroe Limestone Formation And Hodder Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CLHOM
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
broader: NA

Close Hill Siltstone
type: Concept
in scheme: NamedRockUnit
alternative label: CLHS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ClHS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41023
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41024
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41025
has lithology component: CLHS SDST
has lithology component: CLHS SLST
has source info: CLHS_48721
has source info: CLHS_52911
has obsolete equivalent: CLHS mn 965
broader: RBL
has lower boundary definition: Gradational to grey planty siltstones with common planty micaceous fine- to medium-grained sandstones over 10cm. (Delta slope deposits).
has geographical distribution: Not known; probably extensive. Known from large area of Lancaster Fells, and probably extends throughout Lancaster Sheet.
has lithology description: Siltstone, grey, sandy, micaceous, calcareous with rhythmic layers of fine-grained red-brown weathering, sandstone to 1cm; sporadic to common layers of sandy calcisiltite; rare to common Sanguinolites and bellerophontids. NOTE: This is a distinct/unique lithology within the Roeburndale Formation. The formation consists of delta slope siltstones with sandstones. There were previously three known marine bands with goniatite/bivalve faunas. The Close Hill Siltstone is a fourth new marine band.
has thickness description: c. 60m
has upper boundary definition: As lower boundary.

Castell Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cli
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has lithology component: CLI LMST
has lithology component: CLI MDST
has source info: CLI_50946
broader: NP
has additional age information: Llandeilian to Aurelucian
has lower boundary definition: Conformably overlies the Caerhys Shale Formation with gradational boundary.
has geographical distribution: 1:50,000 Sheet 209 (St.David's).
has lithology description: Bluish grey limestones with interbedded mudstones.
has thickness description: 25m
has upper boundary definition: Passes conformably upwards into Caradoc shales.

Cambois Little Coal (Northumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: CLIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLIC COAL
broader: PMCM

Cliff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLIF
has current status: CURRENT
has theme: BEDRCK
notation: CLIF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41026
has lithology component: CLIF MDST
has source info: CLIF_49247
has source info: CLIF_50964
has source info: CLIF_51456
broader: STHV
has lower boundary definition: Succeeds the grey-green well-bedded mudstones and siltstones and thinly bedded sandstones of the Farden Member, with the very fossiliferous Starfish Beds at its summit.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Grey unbedded silty mudstone with sparse brachiopod fauna (slump sheet).
has thickness description: c.10m
has upper boundary definition: Succeeded by grey-green bedded mudstones and siltstones of the Waterfall Member.

Carn Llidi Gabbro
type: Concept
in scheme: NamedRockUnit
alternative label: CLIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has lithology component: CLIN MCQGB
has lithology component: CLIN QGB
has source info: CLIN_49032
has obsolete equivalent: CLIN mn 795
broader: NA
has lower boundary definition: Not applicable.
has geographical distribution: Not specified.
has lithology description: Quartz gabbro and microgabbro
has thickness description: 573m
has upper boundary definition: Not applicable.

Clinterty Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CLINT
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEGRA

Clackmannan Jewel Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLJC
has current status: CURRENT
has theme: BEDRCK
notation: CLJC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLJC COAL
broader: MCMS

Coldbeck Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41027
has lithology component: CLK DOLO
has lithology component: CLK LMST
has lithology component: CLK MDST
broader: Great Scar Limestone Group
has additional age information: Early Chadian.
has lower boundary definition: At base of 'Spongiostroma Band' of Turner, 1950. (Stone Gill, Ravenstonedale).
has geographical distribution: Not defined.
has lithology description: Dark grey, fine-grained limestones with interbedded mudstones and flaggy dolomites characterised by abundance of algal macrostructures including stromatolites and oncolites. Overlying Park Hill Limestone is more bioclastic, contains productoid brachiopods, is more dolomitic and lacks abundance of algal macrostructures. The upper part of underlying Stone Gill Limestone has thick-bedded porcellanous limestones and thin-bedded dolomites with 'Camarotoechia proava'.
has thickness description: 52 metres strata visible in continuous section in Stone Gill but Turner (1950,p.30) estimated that a further 31 metres are cut out by faulting. Maintains a thickness of about 50 metres across NY60NE and NY60NW as far as Gaisgill, then thins westward to 20 metres at west edge of NY60NW.
has upper boundary definition: At top of Algal Nodular Beds under Coldbeck Bridge. (Stone Gill, Ravenstonedale).

Clerkhill Appinite Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CLKH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CLKH AMPHB
has lithology component: CLKH HBDI
has lithology component: CLKH UMR
broader: NE

Clitheroe Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ClL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41028
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41029
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41031
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41030
has lithology component: CLL LMST
has lithology component: CLL MDST
has source info: CLL_49284
has source info: CLL_49866
has source info: CLL_50767
has source info: CLL_50903
has source info: CLL_52686
has source info: CLL_52900
has obsolete equivalent: CLL mn 961
broader: Bowland High Group
narrower: MDPL
narrower: Coplow Limestone Member
narrower: PQL
narrower: Bellman Limestone Member
narrower: Clitheroe Limestone Formation (Knoll-Reef)
narrower: THSL
narrower: THTL
has lower boundary definition: Seen at Ings End (SD 8145 4455), thin-bedded, dark grey silty packstones and interbedded mudstones of the Chatburn Limestone Formation pass upwards conformably into paler, more coarsely bioclastic cleaner-washed limestones of the Clitheroe Limestone Formation.
has geographical distribution: Craven Basin, Lancaster [SD46] to Skipton [SD95] - extent southward not defined.
has lithology description: Predominantly pale grey and commonly coarsely crinoidal, packstones, wackestones and subordinate grainstones and mudstones with Waulsortian mudmound reef limestones present at two levels (for detailed lithogical description, see Miller, et al., 1972 and Lees, et al., 1985).
has thickness description: To 1500m
has upper boundary definition: Seen as a sharp, unconformable boundary between the dominantly limestone succession of the Clitheroe Limestone Formation and the overlying grey to dark grey, thin-bedded calcisiltites and calcareous mudstones with thin limestone interbeds of the Hodder Mudstone Formation. At the type section this upper boundary is equivalent to the base of the Limekiln Wood Limestone Member identified as the "Salthill Cap Beds" of Miller, et al., 1972, and corresponds to a widespread unconformity.

Cloberhill Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CLLC COAL
broader: LSC

Clackmannan Lower Five-Foot Coal (Clackmannan)
type: Concept
in scheme: NamedRockUnit
alternative label: CLLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CLLF COAL
has source info: CLLF_49343
has source info: CLLF_51421
has lateral equivalent: CLLF LSPC
has lateral equivalent: CLLF ALCH
broader: LCMS
has lower boundary definition: Normally fireclay underlying the lower boundary, with presumably a conformable contacts.
has geographical distribution: Main Clackmannan Coalfield, Stirling, Alloa, Midland Valley of Scotland.
has lithology description: Thickness=up to 1.5m in two leavesUsed on maps: equivalent coal the Alloa Cherry shown on Sheet 39E solid, Alloa, 1974 edition based on resurvey 1950-61 by M. Armstrong, A.C. Bishop, E.H. Francis and W.A. Read
has thickness description: Up to 1.5 m thick, in two leaves.
has upper boundary definition: Mudstone above, also probably conformable. In the western part of the area the overlying unit can be an erosionally based sandstone.

Clitheroe Limestone Formation (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: CLLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: CLLK LMST
broader: Clitheroe Limestone Formation

Clady Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Craigenhill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CLLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CLLS LMST
broader: LLGS

Collinwell Sands Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLLW
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41033
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41032
has lithology component: CLLW SDST
has lithology component: CLLW SNDG
has source info: CLLW_48990
has source info: CLLW_49634
has source info: CLLW_50221
has source info: CLLW_50222
has source info: CLLW_51344
has source info: CLLW_52915
has obsolete equivalent: CLLW mn 309
has obsolete equivalent: CLLW mn 1008
has obsolete equivalent: CLLW mn 1744
has obsolete equivalent: CLLW mn 2590
has obsolete equivalent: CLLW mn 3441
has obsolete equivalent: CLLW mn 916
broader: NE
has additional age information: Uppermost Cenomanian and Turonian. Rhynchostreon suborbiculatum Zone.
has lower boundary definition: Disconformable at an erosional surface upon the Island Magee Siltstones Formation.
has geographical distribution: Fully developed in the area southwest of Belfast within the East Antrim Basin and Southern Uplands area. Elsewhere in Northern Ireland the formation may be represented in the condensed successions of the undivided Hibernian Greensands Group.
has lithology description: Pale green to grey coarse-grained unconsolidated sands with some glauconite. Becomes whitish and poorly glauconitic in the Carrickfergus district.
has thickness description: Maximum of 2.4m at Rungill Burn in the Carrickfergus district.
has upper boundary definition: Unconformable at an erosion surface with younger Kilcoan Sands Formation beneath the so-called Turonian non-sequence within the Hibernian Greensands Group; and beneath the erosion surface at the base of the Ulster White Limestone Group.

Cliffe Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: CLMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Cliffe Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: CLMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: LECH

Cove Lower Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CLMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has source info: CLMB_51076
has source info: CLMB_52709
has lateral equivalent: CLMB st 216
broader: SYG
has geographical distribution: Type locality is at Cove Harbour, near Cockburnspath, Berwickshire.
has lithology description: Calcareous sandstone with many fossils.
has supplementary information: Also known as Cove Lower Limestone. Formerly included within the "Calciferous Sandstone Group/Measures/Series". Correlated with the Dun Limestone and the Redesdale Ironstone of Northumbria.
has thickness description: c.4.5m

Clackmannan Musselband Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLMC COAL
broader: MCMS

Claughton Moor Siltstones
type: Concept
in scheme: NamedRockUnit
alternative label: CLMS
has current status: CURRENT
has theme: BEDRCK
notation: ClMS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41034
has lithology component: CLMS SLST
has source info: CLMS_48721
has source info: CLMS_49288
has source info: CLMS_52911
has obsolete equivalent: CLMS st 188
has obsolete equivalent: CLMS mn 932
broader: Claughton Member
has lower boundary definition: Boundary not exposed but believed to be sharp where predominantly siltstone strata overlie predominantly sandstone beds at the top of the Nottage Crag Grit (where this is present) within c.1m of strata.
has geographical distribution: Lancaster Fells.
has lithology description: Laminated grey, micaceous sandy siltstones with sparse marine fauna.
has thickness description: c.24m
has upper boundary definition: Conformable base of Moorcock Sandstones: interbedded fine-grained sandstone and siltstone resting upon the laminated siltstones of the Claughton Moor siltstones.

Clisiophyllum Multiseptatum Band
type: Concept
in scheme: NamedRockUnit
alternative label: CLMT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: CLMT LMST
broader: Dalton Formation

Cleveleys Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
has source info: CLMU_52697
broader: LEMU

Clifford's Mesne Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CLN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: SO
has youngest age: SO
broader: NE
has geographical distribution: The May Hill and Gorsley areas, Welsh Borders.
has thickness description: 3 to 24m

Clowne Coal (Nottingham, Derby And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CLNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLNC COAL
broader: PMCM

Calne Sands Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLNE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Clackmannan Nine Foot Coal (Clackmannan)
type: Concept
in scheme: NamedRockUnit
alternative label: CLNF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLNF COAL
broader: MCMS

Closeburn Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Clo
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41035
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41036
has lithology component: CLO DOLMST
has lithology component: CLO LMST
has lithology component: CLO MDST
has lithology component: CLO SDST
has lithology component: CLO SEATS
has lithology component: CLO SLST
has source info: CLO_52337
has source info: CLO_52417
broader: YORE
has additional age information: Late Asbian to Brigantian; B2 to P2 goniatite zones.
has lower boundary definition: Unconformable on Lower Palaeozoic turbidites.
has geographical distribution: Southern part of the Thornhill Basin at Closeburn, Barjarg, Dollard Hill.
has lithology description: Fossiliferous marine shale, red dolomitic limestone, sandstone and seatearth.
has thickness description: At least 25m
has upper boundary definition: Unconformably overlain by Upper Carboniferous strata.

Clava Lodge Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLOCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41037
has lithology component: CLOCL C
has lithology component: CLOCL V
has source info: CLOCL_50681
has source info: CLOCL_50803
has source info: CLOCL_50861
has source info: CLOCL_50940
has source info: CLOCL_51294
has obsolete equivalent: CLOCL mn 934
broader: Clava Shelly Formation
has lower boundary definition: Sharp, unconformable contact with Drummore Gravel Formation below.
has geographical distribution: Sheet NH74SE.
has lithology description: Silty clay with sparse well rounded, high sphericity pebbles of psammite and quartzite, containing in situ high-boreal shells/microfauna.
has thickness description: 4.9m at type section
has upper boundary definition: Gradational contact, generally marked by colour change (olive-grey to pale yellowish-brown), with the Dalroy Sand Member above.

Clod Coal (South Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CLOD
has current status: CURRENT
has theme: BEDRCK
notation: CL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CLOD COAL
broader: PLCM

Cockloft Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CLOFT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CLOFT COAL
broader: PLCM

Clogherny Member [Duplicate Code: Use Cghy]
type: Concept
in scheme: NamedRockUnit
alternative label: CLOG
has current status: CURRENT
has theme: BEDRCK
notation: CHM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41038
has lithology component: CLOG PSAMM
has lithology component: CLOG SCH
broader: Glenelly Formation
has lower boundary definition: Conformable with normal Glenelly Formation schist.
has geographical distribution: Glenelly, Co.Londonderry, Northern Ireland.
has lithology description: Off-white quartz mica schists and flaggy medium grained to gritty quartzose psammites.
has thickness description: c.40m
has upper boundary definition: Conformable with normal Glenelly Formation schist.

Carlops Shale
type: Concept
in scheme: NamedRockUnit
alternative label: CLOP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CLOP SAPEL
has lateral equivalent: CLOP st 168
broader: HON
has additional age information: Probably late Visean. Detailed age data are not currently available. The quoted age of "Visean" is intended to reflect the associated uncertainty, and is based upon the age of the parent Hopetoun Member, which is currently recorded as Asbian to Brigantian.

Claypole Limestones Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CLPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cp
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: JH
has youngest age: JH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41039
has lithology component: CLPL LMST
has lithology component: CLPL MDST
has source info: CLPL_49022
has source info: CLPL_49323
has source info: CLPL_50409
has source info: CLPL_50484
has obsolete equivalent: CLPL mn 945
broader: Granby Member
has lower boundary definition: Change up from grey, calcareous mudstone with rare thin limestones of the undifferentiated Granby Member; at 71.78m depth in type section Fulbeck Airfield Borehole f/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it may pass south into part of the more argillaceous and less bioclastic Rugby Limestone Member of the Blue Lias Formation (Ambrose, 2001).
has lithology description: Two c 0.25m limestone units, separated by c 1m of mudstone beds with nodular limestone beds in the upper part. The limestone beds are shelly, medium grey, argillaceous packstone/grainstone. Fauna includes forams, bivalves, ammonites, ostracods and echinoderms. The lower part forms a positive feature.
has thickness description: 1.48 to 3m; 1.48m in type section.
has upper boundary definition: Change up into grey, calcareous mudstone of the undifferentiated Granby Member; at 70.30m depth in type section Fulbeck Airfield Borehole f/B5 (SK95SW/17).

Clippens Peat Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLPT
has current status: CURRENT
has theme: SPRFCL
notation: CLPT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41040
has lithology component: CLPT C
has lithology component: CLPT P
has lithology component: CLPT Z
has source info: CLPT_49147
has source info: CLPT_49148
has source info: CLPT_51103
has source info: CLPT_51242
has source info: CLPT_52969
broader: Clyde Catchments Subgroup
has additional age information: Late Devensian to Holocene. The basal 3cm of each peat bed from the Linwood Borehole (see Lithology) have been radiocarbon dated to 7110_50 years BP for the base of the upper peat and 9540_50years BP for the base of the lower. A single specimen of the marine gastropod Onoba semicostata was found in the clay bed, tentatively indicating a marine origin, the transgression ending earlier than 7100 years ago.
has lower boundary definition: The Clippens Peat Formation of the Clyde Catchments Subgroup rests possibly by transitional passage on underlying members and formations or with angular unconformity on older Quaternary sediments or bedrock.
has geographical distribution: The Clippens Peat Formation of the Clyde Catchment Subgroup is recognised discontinuously throughout the Clyde valley catchment.
has lithology description: The Linwood Borehole (Browne and McMillan, 1989a, Figure 17) contains the typical section of the Clippens Peat Formation. Below 45cm of very peaty stony soil there was 1.3m of peat, resting on 5cm of grey rooty clay, followed by a further 84cm pf peat to the base of the formation at 2.64m depth. The base of the upper bed of peat was at 8.43m OD and the base of the lower at 7.54m OD.
has supplementary information: Reliable indicators of saltmarsh vegetation are not found in the peat record but ericaeous pollen taxa may indicate the development of a coastal heath. The formation was originally defined as found only in the Linwood area (Browne and McMillan, 1989a, Figure 5) but now includes all late Devensian and Holocene peats in the Clyde Catchment.
has thickness description: Veneer to over 5m.
has upper boundary definition: The Clippens Peat Formation of the Clyde Catchments Subgroup is exposed at surface in the Clyde valley catchment and also overlain by younger sediments.

Creag Leacach Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41041
has lithology component: CLQU PSAMM
has lithology component: CLQU QZITE
has lithology component: CLQU SEMPEL
has source info: CLQU_50001
has source info: CLQU_51786
has source info: CLQU_52164
has lateral equivalent: CLQU st 735
has obsolete equivalent: CLQU mn 1119
broader: Islay Subgroup
narrower: Carn Dubh Quartzite Member
narrower: Bad An Loin Quartzite Member
has lower boundary definition: Base of dominantly quartzite succession overlying dominantly graphitic succession of the Blair Atholl Subgroup. Base of boulder bed, where developed.
has geographical distribution: Braemar, Ballater and Glen Shee districts.
has lithology description: White quartzite lenses succeeded upwards by cream quartzite and micaceous psammite.
has thickness description: Not known
has upper boundary definition: Top of dominantly quartzitic succession below dominantly graphitic succession of the overlying Ben Eagach Schist Formation.

Coral Rag Formation (Southern England)
type: Concept
in scheme: NamedRockUnit
alternative label: CLR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrRg
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has lithology component: CLR CAMDST
has lithology component: CLR LMOOL
has lithology component: CLR LMST
has lithology component: CLR MDST
has source info: CLR_50407
has source info: CLR_51277
has obsolete equivalent: CLR mn 1176
has obsolete equivalent: CLR mn 937
broader: Corallian Group
has lower boundary definition: Upward change from sandy mudstones of Hazelbury Bryan Formation to a dominantly marly and ooidal sequence.
has geographical distribution: Wiltshire-Dorset, in this formalised sense. In its original use across much of England, but now slowly being restricted as the outcrop is revised and the sequence split up.
has lithology description: Ooidal and pisoidal, marl, marly limestone and limestone.
has thickness description: 6 to 15m
has upper boundary definition: Upward change from dominantly limestone succession to a dominantly arenceous succession of the Sandsfoot Formation.

Coral Rag Member (Cleveland Basin)
type: Concept
in scheme: NamedRockUnit
alternative label: CLRG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: Coralline Oolite Formation

Clifton Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CLRK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CLRK COAL
has lithology component: CLRK MDST
has lithology component: CLRK SDST
has lateral equivalent: CLRK OCR
broader: PLCM
has geographical distribution: West Yorkshire area {Clifton, northwest of Huddersfield, Yorkshire].
has lithology description: The Clifton Rock consists of up to three leaves of fine-grained cross-bedded or ripple cross-laminated sandstone and includes a thin coal. The Shertcliffe Coal rests on the top leaf, sometimes termed the Shertcliffe Seatstone.

Collering Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CLS SDST
broader: Border Group

Cephalaspis Sandstone-Cornstone
type: Concept
in scheme: NamedRockUnit
alternative label: CLSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
broader: NE

Claragh Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLSG
has current status: CURRENT
has theme: BEDRCK
notation: CLSG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41045
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41046
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41044
has lithology component: CLSG CONG
has lithology component: CLSG PESST
has lithology component: CLSG SDST
has source info: CLSG_49803
has source info: CLSG_51623
has obsolete equivalent: CLSG mn 924
broader: TYRO
has lower boundary definition: Variable; either resting unconformably on Dalradian Supergroup metamorphic rocks or unconformably overstepping older Carboniferous strata, everywhere with a basal conglomerate.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, fawn to pale brown, coarse- to very coarse-grained, lithic arkose to subarkose with pebbly horizons, thin to very thick beds; slumped cross-bedded channels, basal conglomerate with calcrete nodules.
has thickness description: 0 to at least 350m
has upper boundary definition: Fining upwards into heterolithic alternating shales, siltstones and thin sandstones; succeeded abruptly and conformably by either peritidal carbonates of Termon River Limestone Formation or sandstones of Bin Mountain Sandstone Formation.

Clava Shelly Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLSH
has current status: CURRENT
has theme: SPRFCL
notation: ClSh
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41047
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41048
has lithology component: CLSH CLAY
has lithology component: CLSH DMTN
has lithology component: CLSH SANDU
has source info: CLSH_48667
has source info: CLSH_50803
has source info: CLSH_50861
has source info: CLSH_50940
has source info: CLSH_52812
broader: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: Dalroy Sand Member
narrower: CSCL
narrower: Culdoich Till Member
narrower: Clava Lodge Clay Member
narrower: CLSA
narrower: CLST
has lower boundary definition: Unconformable, glacitectonic boundary of the Clava Lodge Clay Member of the Clava Shelly Formation with the Drummore Gravel Formation below.
has geographical distribution: Sheet NH74SE.
has lithology description: Diamicton, olive-grey, very stiff, fissile, with sparse shell material and silty sand. See also details of the Dalroy Sand (DROY), Clava Lodge Clay (CLOCL) and Culdoich Till (CUTI) members.
has thickness description: 11m at type section
has upper boundary definition: Unconformable, glacitectonic boundary with Finglack Till Formation above.

Clyst St Lawrence Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CSL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41049
has lithology component: CLSL SANDU
has lithology component: CLSL SDST
has lithology component: CLSL SILT
has lithology component: CLSL SLST
has source info: CLSL_51236
broader: Aylesbeare Mudstone Group
has lower boundary definition: Rests unconformably on Crackington Formation between Westwood (SY 020 990) and Clyst Hydon; elsewhere contacts faulted. Near Cullompton (in Sheet 310) apparently rests unconformably on Bude Formation and Cadbury Breccia.
has geographical distribution: Outcrop extends from Westwood (SY 020 990), northwards through Clyst St Lawrence (ST 030 001) to Langford Green (ST 030 030) and Mutterton (ST 030 050).
has lithology description: Reddish brown silt and sand, ranging from sand, through silty sand, silty clayey sand, sandy silt, clayey silt, and sandy clayey silt; the sand content is mainly fine- to very fine-grained. Probably sandstone and siltstone where unweathered.
has thickness description: 30-50m
has upper boundary definition: Passes gradationally upwards into reddish brown silty mudstones of the undivided Aylesbeare Mudstone.

Clent Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cle
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41053
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41054
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41051
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41052
has lithology component: CLT BREC
has lithology component: CLT MDST
has lithology component: CLT PESST
has lithology component: CLT SDST
has source info: CLT_48954
has source info: CLT_49513
has source info: CLT_49786
has source info: CLT_49788
has source info: CLT_49789
has source info: CLT_49792
has source info: CLT_50783
has source info: CLT_51095
has source info: CLT_51197
has source info: CLT_51312
has source info: CLT_51369
has source info: CLT_51998
has source info: CLT_52462
has source info: CLT_52614
has source info: CLT_52630
has source info: CLT_52735
has obsolete equivalent: CLT mn 582
has obsolete equivalent: CLT mn 951
has obsolete equivalent: CLT mn 952
has obsolete equivalent: CLT mn 953
has obsolete equivalent: CLT mn 4240
broader: WAWK
has lower boundary definition: Unconformable/disconformable boundary between underlying mudstone/sandstone of Salop Formation (Enville Member) and coarse breccia above (in type area); gradational boundary in Wolverhampton area.
has geographical distribution: West Midlands; South Staffordshire and Birmingham areas.
has lithology description: Breccia, sub-angular, with red-brown mudstone matrix, clasts predominantly 'Precambrian-Uriconian' volcanic rocks and subordinate Lower Palaeozoic rocks. Red pebbly mudstone and sandstone in Wolverhampton area.
has thickness description: c.138m in Clent Hills, c.240m in Wolverhampton/Baggeridge area to north.
has upper boundary definition: Generally, modern erosion surface in type area, locally overlain unconformably by Kidderminster Formation (Triassic).

Clackmannan Two Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLTF COAL
broader: MCMS

Clogau Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLu
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41055
has lithology component: CLU MDST
has lithology component: CLU SDST
has lithology component: CLU SLMDST
has source info: CLU_51060
has source info: CLU_52252
has source info: CLU_52536
has obsolete equivalent: CLU mn 962
broader: MWG
has lower boundary definition: Conformably overlies sandstone of the Gamlan Formation (Harlech Grits Group). Boundary is transitional over 5m.
has geographical distribution: Northern, eastern and southern flanks of the Harlech Dome, North Wales.
has lithology description: Black pyritous and carbonaceous mudstones and silty mudstones with rare silt laminae and sparse fine-grained sandstone beds.
has supplementary information: Basal unit of the Mawddach Group.
has thickness description: 90 to 105m
has upper boundary definition: Sharply but unconformably overlain by silty mudstone and sandstone turbidites of the Maentwrog Formation.

Cluanie Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CLUA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CLUA MCGDP
broader: NE

Cluanie Granodiorite
type: Concept
in scheme: NamedRockUnit
alternative label: CLUAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CLUAG GDHB
has lithology component: CLUAG GNL
has lithology component: CLUAG HBBGD
has lithology component: CLUAG MCGNA
has lithology component: CLUAG MZGN
broader: Argyll And Northern Highlands Granitic Suite

Clackmannan Upper Five Foot Coal (Clackmannan)
type: Concept
in scheme: NamedRockUnit
alternative label: CLUF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLUF COAL
broader: MCMS

Clunes Complex
type: Concept
in scheme: NamedRockUnit
alternative label: CLUNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CLUNS TO
broader: Argyll And Northern Highlands Granitic Suite

Clyde Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLVY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41057
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41056
has lithology component: CLVY C
has lithology component: CLVY P
has lithology component: CLVY S
has lithology component: CLVY V
has lithology component: CLVY Z
has source info: CLVY_49147
has source info: CLVY_49148
has source info: CLVY_49150
has source info: CLVY_51617
has source info: CLVY_51692
has obsolete equivalent: CLVY mn 2339
is obsolete equivalent of: CLVY CLYCA
broader: Clyde Catchments Subgroup
narrower: LAWSG
narrower: KELV
narrower: LNCH
has lower boundary definition: Unconformably overlies older Quaternary deposits and bedrock.
has geographical distribution: Recognized in the Clyde catchment area as the alluvial deposits of the Clyde and all its tributaries, from highest to lowest order.
has lithology description: In the Clyde valley catchment, especially the Clyde and its major tributaries, the formation consists of a wide range of lithologies encompassing pebbles, fine to coarse gravel, cobbles and boulders in a sandy matrix and coarse- to fine-grained sand, silt and clay. Beds rich in organic remains occur as well as peat (in the floodplain deposits). A partial type section is recorded in the BGS Law Borehole (Law Formation of Browne and McMillan, 1989a, 39-40 and Figure 22). The lithology here is of massive, flat laminated and also cross-bedded, grey, fine to coarse-grained sand with silt and traces of fine gravel. In the BGS Lochwinnoch Borehole (ibid, Figure 25) loose to dense, dark brownish grey, framework supported, sub-angular to rounded fine to medium gravel with sand is recorded. Bedded silt with thin peat units and organic layers are intercalated. The stratigraphical relationships of the Clyde Valley Formation (formerly Law Formation) are illustrated in ibid (Figure 3) and its geographical distribution in ibid (Figure 2e). Although the above associations for the formation are different in grain size, they are both the products of fluvial processes operating on different scales. At Law the deposits are of a minor meandering stream and at Lochwinnoch of an intermediate sized alluvial fan laterally infilling the basin in the Lochwinnoch Gap.
has supplementary information: See additional information woven into the Lithology description.
has thickness description: Veneer to several metres.
has upper boundary definition: Normally the land surface.

Colwick Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has source info: CLW_51524
has source info: CLW_51674
has source info: CLW_52059
has obsolete equivalent: CLW mn 1009
broader: TPSF
has supplementary information: Originally defined as a Formation (Elliott, 1961; Warrington et al., 1980) the term was not used during the remapping of the Nottingham sheet and adjacent areas (e.g. Charsley et al., 1990), being subsumed into the Sneinton Formation. Following referral of the former Sneinton Formation to the nationally applicable Tarporley Siltstone Formation, the beds originally referred to the Colwick Formation are now treated as a local, upper member of the Tarporley Siltstone Formation in the southern apart of the East Midlands Shelf (c.f. Retford Member).

Cloud Wood Member
type: Concept
in scheme: NamedRockUnit
alternative label: CLWD
has current status: CURRENT
has theme: BEDRCK
notation: CIW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41058
has lithology component: CLWD DOLMST
has lithology component: CLWD MDST
has lithology component: CLWD SLST
has source info: CLWD_50023
has source info: CLWD_51628
has source info: CLWD_52211
has obsolete equivalent: CLWD mn 2658
has obsolete equivalent: CLWD mn 778
has obsolete equivalent: CLWD mn 3496
broader: Cloud Hill Dolostone Formation
has lower boundary definition: Base is marked by an unconformity/shear surface with sheared mudstone resting on dolomite of the Milldale Limestone Formation.
has geographical distribution: Known only in Cloud Hill Quarry.
has lithology description: Dark grey mudstones with thin dolostone and dolomitic siltstones, passing up into dolostones with common, thin grey and red mudstone beds and partings.
has thickness description: To 36m
has upper boundary definition: The top is marked by an abrupt change from thinly bedded dolostone with common mudstone partings to massive, finely crystalline dolostone.

Clwyd Limestone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CLWYD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41059
has lithology component: CLWYD CHRT
has lithology component: CLWYD DOLMST
has lithology component: CLWYD LMST
has lithology component: CLWYD MDST
has lithology component: CLWYD SDST
has source info: CLWYD_48702
has source info: CLWYD_48748
has source info: CLWYD_49279
has source info: CLWYD_49974
has source info: CLWYD_50795
has source info: CLWYD_50992
has source info: CLWYD_51187
has source info: CLWYD_52509
has obsolete equivalent: CLWYD mn 778
has obsolete equivalent: CLWYD mn 1865
has obsolete equivalent: CLWYD mn 2957
has obsolete equivalent: CLWYD mn 780
has obsolete equivalent: CLWYD mn 1384
broader: Carboniferous Limestone Supergroup
narrower: LEEL
narrower: LELH
narrower: Cefn Mawr Limestone Formation
narrower: DWIC
narrower: Foel Formation
narrower: MRF
narrower: LGHL
narrower: LHCM
narrower: LLLK
narrower: LLLL
narrower: Clwyd Group (Knoll Reef)
narrower: LNML
narrower: REL
has lower boundary definition: In places conformably succeeds reddened siliciclastic facies of the "Basement Beds"; elsewhere rests with marked unconformity on Lower Palaeozoic rocks.
has geographical distribution: Crops out on Anglesey (SH 50 80) and on the North Wales mainland between Bangor (SH 54 70) and Oswestry (SJ 27 23); and on the Corwen Outlier (SJ 05 43).
has lithology description: Diverse range of limestone facies with subordinate sandstone and mudstone units, and exhibiting local dolomitisation. Records the initiation and growth of a carbonate platform along the northern flank of the Wales-Brabant Massif.
has thickness description: To 900m
has upper boundary definition: Conformable base of Pentre Chert Formation or Cefn-y-fedw Sandstone Formation in northeast Wales; elsewhere marked by an unconformity with younger Carboniferous or Permo-Triassic rocks.

Clwyd Group (Knoll Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: CLWYK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: CLWYK LMST
broader: Clwyd Limestone Group

Corseclays Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cly
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41060
has lithology component: CLY PESST
has lithology component: CLY SDST
has source info: CLY_50649
has source info: CLY_52331
broader: STEW
narrower: Bennane Lea Breccia Member
has lower boundary definition: Stratigraphical boundary with the underlying Park End Breccia Formation is concealed but inferred to be conformable. At Bennane Lea the base of the Formation is unconformable and oversteps onto Early Ordovician igneous rocks.
has geographical distribution: In the immediate vicinity of Ballantrae, Ayrshire, southwest Scotland.
has lithology description: Red cross-laminated, micaecous fine-grained sandstone. Grains mostly of subrounded quartz, a significant minority of grains with a high degree of sphericity are probably of aeolian origin. Locally, at Bennane Lea [NX 091 858], the sandstone is pebbly and referred to the Bennane Lea Member.
has thickness description: The minimum preserved thickness of the Formation exceeds 500m, as exposed along the coast between Ballantrae and Bennane Lea.
has upper boundary definition: The extent of the Corseclays Formation is delimited by erosion and the upper boundary of the Formation is not seen. It is not known if younger Permian or Triassic strata overlie the Formation.

Clackmannan Yard Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CLYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CLYC COAL
broader: NE

Clyde Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CLYCA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41061
has lithology component: CLYCA C
has lithology component: CLYCA DMTN
has lithology component: CLYCA P
has lithology component: CLYCA S
has lithology component: CLYCA V
has lithology component: CLYCA Z
has source info: CLYCA_49147
has source info: CLYCA_49148
has source info: CLYCA_49689
has source info: CLYCA_50918
has obsolete equivalent: CLYCA mn 1716
has obsolete equivalent: CLYCA CLVY
broader: Britannia Catchments Group
narrower: Clippens Peat Formation
narrower: Clyde Valley Formation
narrower: SRCK
has lower boundary definition: Unconformable contacts with units of the Midland Valley, Mearns, Central Grampian and Southern Uplands Glacigenic subgroups, and bedrock.
has geographical distribution: The present physical catchments of the rivers Clyde, Kelvin, Endrick and the rivers of Ayrshire. The catchments extend across Strathclyde, (Ayrshire, Lanarkshire and Dunbartonshire).
has lithology description: A suite of fluvial, lacustrine, mass movement and periglacial deposits that contain clasts derived from Palaeozoic rocks and glacigenic deposits cropping out in the catchment of the River Clyde and other rivers flowing directly to the Firth of Clyde, including the River Leven, and Waters of Girvan, Ayr and Irvine. The deposits include alluvium and river terrace deposits of the Clyde Valley Formation, fluvial deposits of the Strathendrick Formation and Strathkelvin Formation, lacustrine deposits of the Kilmarnock Silt Formation, peat of the Clippens Peat Formation and other units defined simply as lithogenetic categories. The deposits of the subgroup comprise gravel, sand, silt, peat and head. Rock types are principally of Carboniferous and Devonian strata (sandstone, siltstone) with volcanic (basalt) and intrusive igneous rocks (microdiorite) of Midland Valley provenance. Variable but generally minor components of Dalradian metasedimentary and Caledonian igneous rocks derived from the Grampian Highlands are present. Southern Uplands sourced greywacke sandstone and siltstone and Caledonian igneous rocks form a component of clastic fluvial deposits in parts of catchments close to the Southern Uplands.
has thickness description: To 25m
has upper boundary definition: Generally the ground surface, but units of this Subgroup interfinger locally with units of the Great Britain Coastal Deposits Group.

Clyde Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLYD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41062
has lithology component: CLYD C
has lithology component: CLYD S
has lithology component: CLYD V
has lithology component: CLYD VS
has lithology component: CLYD Z
has lithology component: CLYD ZC
has source info: CLYD_49147
has source info: CLYD_49148
has source info: CLYD_50918
has source info: CLYD_51103
has source info: CLYD_51242
has source info: CLYD_51401
has source info: CLYD_51617
has source info: CLYD_52969
has obsolete equivalent: CLYD mn 972
broader: British Coastal Deposits Group
narrower: INVN
narrower: PAIS
narrower: LIWD
narrower: KARN
narrower: Balloch Clay Member
narrower: Bridgeton Sand Member
has additional age information: Windermere Interstadial to Loch Lomand Stadial.
has lower boundary definition: The Clyde Clay Formations rests with angular unconformity on older Quaternary sediments or bedrock. It normally rests on the Wilderness Till Formation (WITI) of the Caledonian Glacigenic Group (Midland Valley Glacigenic Subgroup).
has geographical distribution: The Clyde Clay Formation is recognised in the lower Clyde valley north of Lanark, in and around the estuary of the Clyde and Firth of Clyde and linked sea lochs, and in Loch Lomand. It is also present under the coastal plain of Ayrshire.
has lithology description: The Clyde Clay Formation has six members, from oldest to youngest - the Bridgeton Sand consists of beds of fine- to medium-grained sand, and sandy fine to coarse gravel in an upward-fining succession. The Paisley Clay consists of clays and silts, finely colour banded in shades of greyish brown, grey and reddish brown. The Linwood Clay consists of thickly bedded to massive silts, clayey silts and silty clays, medium to dark grey becoming brownish grey downwards, with sand layers, black sulphide bands and many marine shells. The Killearn Sand and Gravel is commonly reddish brown and yellow, fine- to medium-grained sand with clay layers and beds of gravel. The Inverleven Gravel typically is angular to subrounded boulders, cobbles and gravel in a clayey sand matrix with barnacles. The Balloch Clay consists of clayey silt, silt, clay and sand, mid to dark grey, brownish grey and locally reddish brown, bedded and thinly laminated, normal and reverse graded units, with dark sulphide patches and rare marine shells. Their stratigraphical relationships and geographical distribution are summarized in Browne and McMillan, 1989a, Figures 2b, c and d, 3A, B, C and D and 4A, B and C.)
has thickness description: Veneer to more than 50m.
has upper boundary definition: The Clyde Clay Formation is overlain unconformably by younger Quaternary sediments, normally either the Clydebank Clay Formation of the British Coastal Deposits Group or the Clippens Peat Formation or Clyde Valley Formation of the Britannia Catchments Group (Clyde Catchment Subgroup). It is also extensively exposed at surface in the lower Clyde valley.

Clyth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CLYTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: CLYTH SDST
has obsolete equivalent: CLYTH mn 979
has obsolete equivalent: CLYTH mn 1961
broader: LCF

Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]
type: Concept
in scheme: NamedRockUnit
alternative label: CM
has current status: CURRENT
has theme: BEDRCK
notation: CM
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41064
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41065
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41066
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41067
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41063
has lithology component: CM COAL
has lithology component: CM MDST
has lithology component: CM SDST
has lithology component: CM SEATS
has lithology component: CM SLST
has source info: CM_49789
has source info: CM_50571
has source info: CM_51961
has source info: CM_52516
has source info: CM_52581
has obsolete equivalent: CM mn 3408
broader: NP
narrower: LCM
narrower: MUCM
narrower: MONC
narrower: MPIE
narrower: Crow Coal (Dungannon: Duckmantian)
narrower: UCM
narrower: LMC
narrower: Beltiboy Coal (Dungannon)
narrower: SHCO
narrower: MCM
narrower: Bone Coal (Dungannon)
narrower: Derry Coal (Dungannon)
narrower: Brackaville Coal (Dungannon)
narrower: Gortnaskea Coal (Dungannon)
has lower boundary definition: Base of Gastrioceras subcrenatum Marine Band (=Subcrenatum Marine Band) or at base of coal-bearing sequence if this marker band cannot be identified.
has geographical distribution: Britain, except Devon and Cornwall, and parts of Ireland for the Group; England and Wales for divisions LCM, MCM and UCM.
has lithology description: Alternation of sandstone, grey siltstone and grey mudstone, with frequent coal seams and seatearth horizons. NOTE: Definitions for the base of the Coal Measures, and the bases of the Middle and Upper divisions, are those of Stubblefield and Trotter (1957), but the top of the Coal Measures in the Pennine Basin is newly defined on a purely lithostratigraphical basis, (Powell et al., 1999). In areas such as South Wales, where no significant Carboniferous red-beds overlie the coal-bearing measures, the top of the Coal Measures may be defined differently.
has thickness description: Up to 1600m in the Potteries Syncline; to c.1900m in Lancashire.
has upper boundary definition: Base of lowest conformably overlying red-bed formation - Etruria Marl or lateral equivalent.

Comber Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Cromar Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CMAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Cairngorm Granitic Suite

Cautley Mudstone Formation And Ashgill Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CMAS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has lithology component: CMAS MDST
has lithology component: CMAS SDST
has lithology component: CMAS SLMDST
has lithology component: CMAS SLST
has lithology component: CMAS TUF
broader: Dent Group

Colsterdale Marine Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: SILS
narrower: Colsterdale Limestone

Benscliffe Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMBA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMBA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41069
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41070
has lithology component: CMBA LPTUF
has lithology component: CMBA TFSLST
has lithology component: CMBA TUF
has lithology component: CMBA VCBR
has source info: CMBA_50064
has source info: CMBA_50900
has source info: CMBA_50921
has source info: CMBA_52376
has obsolete equivalent: CMBA mn 402
has obsolete equivalent: CMBA mn 1530
broader: Beacon Hill Formation
broader: Charnwood Lodge Volcanic Formation
has lower boundary definition: Not seen, but inferred to be a sharp contact on grey, laminated volcaniclastic siltstones of the Blackbrook Reservoir Formation.
has geographical distribution: The unit extends from Hanging Stone (above), southwards to Benscliffe Wood and, northwards, and is last seen at Rhododendron Hill (SK 4980 1693), Nanpantan.
has lithology description: Grey, very thickly bedded, massive andesitic and dacitic volcanic breccia, grading to lapilli tuff, with subordinate beds of fine-, medium- and coarse-grained andesitic to dacitic tuff.
has thickness description: 20-100m
has upper boundary definition: Grades up into medium- and coarse-grained tuff, with subordinate lapilli tuff beds, and pale grey, laminated to bedded tuffaceous mudstones, siltstones and sandstones of the Beacon Hill Formation. In the west it thickens and merges laterally with the Charnwood Lodge Formation (lower part).

Cambeck Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMBB
has current status: CURRENT
has theme: BEDRCK
notation: CAMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41071
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41072
has lithology component: CMBB LMST
has lithology component: CMBB MDST
has lithology component: CMBB SDST
has lithology component: CMBB SLST
has source info: CMBB_49231
has source info: CMBB_50832
has obsolete equivalent: CMBB mn 762
broader: LYNE
narrower: MWL
narrower: SYGL
narrower: WRSB
narrower: UAQB
narrower: QYS
narrower: Barron's Pike Sandstone
narrower: LAQB
narrower: HLAB
has lower boundary definition: Conformable on Main Algal Fourteen of the Main Algal Member (Lyne Formation) of Bewcastle.
has geographical distribution: Northumberland - Solway Basin. Bewcastle district (England Sheet 12).
has lithology description: Rhythmic cycles of sandstones, thin limestones and mudstones, the beds abundantly shelly; some algal beds.
has thickness description: 204m (Bewcastle).
has upper boundary definition: Conformable upper boundary with the base of the locally developed Whitberry Bed of the Fell Sandstone Formation.

Coombe Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: CMBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CMBC COAL
has lateral equivalent: CMBC st 204
has lateral equivalent: CMBC st 209
broader: PMCM

Combe Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMBE
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: CMBE CLAY
has lithology component: CMBE GRAV
has lithology component: CMBE PECL
broader: NDR
has lithology description: Chalk gravel in a fine-grained chalk clay matrix, with flint pebbles; commonly overlain by a metre of pale brown silty chalky loam; waterlain. [Generic description: 1:50 k map margins].

Buck Hills Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMBG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41073
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41074
has lithology component: CMBG TFAMST
has lithology component: CMBG TFASST
has lithology component: CMBG TFSLST
has lithology component: CMBG TUF
has source info: CMBG_50900
has source info: CMBG_50921
has source info: CMBG_51833
has source info: CMBG_52376
has obsolete equivalent: CMBG mn 657
has obsolete equivalent: CMBG mn 658
broader: Beacon Hill Formation
has lower boundary definition: Sharp to locally gradational base on Sandhills Lodge Member, latter comprising volcaniclastic sandstone and sediment-clast breccia.
has geographical distribution: Buck Hills.
has lithology description: Blue-grey, laminated, graded volcaniclastic mudstones and siltstones with beds of massive to graded medium-grained volcaniclastic sandstone.
has thickness description: About 790m
has upper boundary definition: Sharp contact with interbedded volcaniclastic sandstones and breccias of Outwoods Breccia Member.

Beacon Hill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMBH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BHI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41075
has lithology component: CMBH TFAMST
has lithology component: CMBH TFASST
has lithology component: CMBH TFSLST
has lithology component: CMBH TUF
has lithology component: CMBH VCBR
has source info: CMBH_50900
has source info: CMBH_50921
has source info: CMBH_51833
has source info: CMBH_52376
has obsolete equivalent: CMBH CMBH
has obsolete equivalent: CMBH mn 323
is obsolete equivalent of: CMBH CMBH
broader: Maplewell Group
narrower: Beacon Tuff Member
narrower: SND
narrower: OTB
narrower: Benscliffe Breccia Member
narrower: Buck Hills Member
narrower: Park Breccia
has lower boundary definition: Probable sharp contact, at base of Benscliffe Breccia Member, on grey-green, laminated, fine- to medium-grained volcaniclastic beds of the Blackbrook Reservoir Formation.
has geographical distribution: Extends from Nanpantan Hills, south to Bradgate Park, then north-west to Ulverscroft Mill.
has lithology description: Varied sequence of grey to blue-grey epiclastic and tuffaceous mudstones, siltstones and sandstones with subordinate volcanic block-breccias and lithic-crystal tuffs.
has thickness description: About 1840m
has upper boundary definition: Sharply overlain by Bradgate Formation beds, of blue-grey, laminated volcaniclastic mudstones, siltstones and sandstones.

Combe Martin Beach Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CMBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
broader: NE

Carmichael Burn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMBN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMBN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41076
has lithology component: CMBN MDST
has lithology component: CMBN SDST
has lithology component: CMBN SLST
has source info: CMBN_49017
has source info: CMBN_49584
has source info: CMBN_52143
has obsolete equivalent: CMBN mn 692
has obsolete equivalent: CMBN mn 1163
has obsolete equivalent: CMBN mn 793
has obsolete equivalent: CMBN mn 2738
broader: Carmichael Group
has lower boundary definition: Faulted out by the Carmichael Fault.
has geographical distribution: Carmichael Inlier, Lanarkshire, Scotland.
has lithology description: Pale greyish olive, greenish grey and greyish red mudstones and thin beds of olive-grey and purplish siltstones, locally containing marine fossils. One interbedded unit of greyish orange to greyish red quartose sandstone.
has thickness description: c.168m
has upper boundary definition: Top of the predominantly mudstone succession of the Carmichael Burn Formation below the fairly sharp incoming of the Fence Conglomerate Member of the Westgate Formation

Camberley Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CMBS SANDU
has lithology component: CMBS SDST
broader: Bracklesham Group

Creag Mhor Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMC
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41080
has lithology component: CMC CONG
has source info: CMC_50545
has source info: CMC_51673
has obsolete equivalent: CMC mn 1121
broader: Auchencar Sandstone Formation
has lower boundary definition: The base of the lowest conglomeratic unit within the Auchencar Sandstone Formation or locally the Auchencar Lava Member.
has geographical distribution: Isle of Arran.
has lithology description: A coarse conglomerate with boulders of mainly andesite lava, with predominantly quartzite boulders in the lower part.
has thickness description: 270 m thick.
has upper boundary definition: The base of the Am Binnein Sandstone Formation.

Comin Coch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMCC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NP
narrower: TYSA

Charnwood Lodge Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41081
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41082
has lithology component: CMCL AND
has lithology component: CMCL DA
has lithology component: CMCL LPTUF
has lithology component: CMCL VCBR
has lithology component: CMCL VCMST
has lithology component: CMCL VCSLST
has source info: CMCL_50921
has obsolete equivalent: CMCL mn 885
has obsolete equivalent: CMCL mn 884
broader: Maplewell Group
narrower: SBTU
narrower: Benscliffe Breccia Member [Superfluous Entry: Use Cmba]
narrower: SYB
narrower: Cademan Volcanic Breccia Member
narrower: KHT
narrower: Benscliffe Breccia Member
has lower boundary definition: Not exposed, taken at base of the Benscliffe Breccia Member, consisting of grey, crystal-rich volcanic breccia. This member overlies grey-green fine- to medium-grained volcaniclastic rocks of the Blackbrook Reservoir Formation.
has geographical distribution: North-west Charnwood Forest, from Grace Dieu to Bardon Hill.
has lithology description: Andesitic to dacitic volcanic block-breccias and lithic lapilli tuffs, massive to poorly stratified, divided into members in part. The unit is the lateral equivalent of the Beacon Hill Formation.
has thickness description: About 1300m
has upper boundary definition: Sharp or gradational over 1m with Bradgate Formation, latter consisting of dark to medium grey laminated volcaniclastic siltstones and sandstones with disturbed bedding.

Comb Coal (South Yorkshire And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: CMCO
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CMCO COAL
broader: NE

Carmel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Charmandean Flint
type: Concept
in scheme: NamedRockUnit
alternative label: CMFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Carrickmore Granite
type: Concept
in scheme: NamedRockUnit
alternative label: CMGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Caw Mill Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CMI
has current status: CURRENT
has theme: BEDRCK
notation: CMi
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41083
has lithology component: CMI SDST
has source info: CMI_49848
broader: RBL
has lower boundary definition: Sharp upward change in a conformable sucession from predominantly grey siltstone to sandstone - base of first sandstone bed above the Brennand Grit.
has geographical distribution: Abbeystead Forest [SD 5500 5400] southeast of Lancaster.
has lithology description: A medium-bedded, brownish grey, fine- to medium-grained, turbiditic sandstone.
has thickness description: 0 to 10m
has upper boundary definition: Sharp upward change in a conformable sucession from sandstone to predominatly siltstone - top of last sandstone below the Long Bridge Sandstone.

Carn Marth Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CMIN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: CMIN GN
broader: NE
has lithology description: Coarse-grained granite with abundant feldspar phenocrysts >15mm.

Crummack Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cmk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41084
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41085
has lithology component: CMK LMST
has lithology component: CMK MDST
has lithology component: CMK SLST
has source info: CMK_49554
has source info: CMK_50498
has source info: CMK_52930
has obsolete equivalent: CMK mn 4007
broader: STK
has lower boundary definition: Taken at the base of calcareous mudstone and black graptolitic mudstone that contains a Rhuddanian and Aeronian fauna, overlying mudstone and siltstone of the Sowerthwaite Formation.
has geographical distribution: Restricted to the Craven inliers, North Yorkshire.
has lithology description: Mudstone and siltstone, black, graptolitic. Mudstones at the base of the formation are calcareous and contain a shelly fauna. Towards the top of the formation calcareous siltstones contain nodules and thin beds of limestone.
has thickness description: Up to 35m
has upper boundary definition: Defined by the base of the overlying Austwick Formation.

Cleatham Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CML
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41086
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41087
has lithology component: CML CAMDST
has lithology component: CML CASLST
has lithology component: CML LMST
has source info: CML_48755
has source info: CML_49890
has source info: CML_50346
has source info: CML_51523
has source info: CML_53039
has obsolete equivalent: CML mn 946
has obsolete equivalent: CML mn 3733
has obsolete equivalent: CML mn 292
broader: LLL
has additional age information: Lower Bajocian, Discites Zone.
has lower boundary definition: Quasi-conformable contact with predominantly calcareous mudstone and siltstone of the underlying part of the Raventhorpe Member where present, or more or less disconformable contact with sandstones and mudstones of the underlying Grantham Formation, overlain by limestone.
has geographical distribution: BGS 1: 50 000 sheets 80, 89, North Lincolnshire (south of the Humber).
has lithology description: Limestone, predominantly calci-silty and calci-muddy with more or less abundant shell debris and peloids (wackestone and packstone) and fine quartz sand, ferruginous in some beds. Locally containing calcareous mudstone or siltstone interbeds, locally with ooidal packstone and grainstone at the top.
has supplementary information: Use of the term Cleatham Limestone (mapped on sheets 80 and 89) should not be perpetuated in any review of the Lincolnshire Limestone. Even if the term is deemed valid the Member status should be dropped and the term returned to informal "Cleatham Limestone" status. Member status is inappropriate as it lies within the "Reventhorpe Beds Member" of Gaunt et al., 1992. Recommended stratigraphical revision of the Lincolnshire Limestone Formation places the latter as part of the Lower Lincolnshire Limestone Member. Due to the confusion over the status of the Cleatham Limestone and the Raventhorpe Beds, the Parent Unit is indicated as Lower Lincolnshire Limestone Member. The Cleatham Limestone is a mixed bag of limestones that were mapped south of the Humber. If a local thin leaf of underlying mudstones is ignored the unit is the same as the Hydraulic Limestones (south of the Humber) of previous authors, which were excluded from the Raventhorpe Beds. Ashton (1975, 1980) complicated the issue by placing some of the Cleatham/Hydraulic Limestone in his Santon Oolite Member (lower leaf). The unit is a useful entry as regards mapping though, given its modest thickness and undistinguished lithology it might better be considered as "Limestone in Raventhorpe Beds". [Condensed from notes by M G Sumbler, 29/09/2005.]
has thickness description: 0 to c.2m
has upper boundary definition: Conformable contact between limestone below and predominantly calcareous mudstone and siltstone of the overlying part of the Raventhorpe Member (Lincolnshire Limestone Formation).

Cilmaenllwyd Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CMLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CMLC COAL
broader: Brithdir Member

Crammel Linn Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CMLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CMLS SDST
broader: Border Group

Clenchers Mill Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
broader: NE

Combe Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41088
has lithology component: CMMU MDST
has source info: CMMU_52415
has source info: CMMU_52918
has obsolete equivalent: CMMU mn 1012
has obsolete equivalent: CMMU mn 1011
has obsolete equivalent: CMMU mn 1013
broader: TEVY
has lower boundary definition: The lower boundary is taken at the incoming of bluish black and black mudstones of the Combe Mudstone Formation above the olive green and pale grey mudstones of the underlying Trusham Mudstone Formation.
has geographical distribution: Teign Valley (SX 84 84) and Ilsington area (SX 78 76), east Dartmoor, south Devon.
has lithology description: Very fissile bluish black "shales", locally characterized by white, silty laminations and closely spaced vertical joints, particularly in higher horizons. Siliceous nodules become common in the upper part. The formation is unfossiliferous apart from ?wood fragments.
has thickness description: 45m in the Ilsington area, thickening northwards to 90-200m in the Teign valley area.
has upper boundary definition: The upper boundary is taken at the incoming of interbedded cherts and siliceous mudstones of the overlying Teign Chert Formation above the bluish black and black mudstones of the Combe Mudstone Formation. The boundary is taken at the base of the first bedded chert.

Causemountain Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SD
has predominant age: SD
has youngest age: SD
broader: NE

Cementstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMNT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has lithology component: CMNT LMST
has lithology component: CMNT MDST
broader: Farne Group [Offshore]

Coal Mosie (Clackmannan)
type: Concept
in scheme: NamedRockUnit
alternative label: CMO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CMO COAL
broader: LCMS

Carn Monadh Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMOGR
has current status: CURRENT
has theme: SPRFCL
notation: CM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41089
has lithology component: CMOGR DMTN
has lithology component: CMOGR GRAV
has lithology component: CMOGR SANDU
has lithology component: CMOGR SILT
has source info: CMOGR_50681
has source info: CMOGR_50834
has source info: CMOGR_52490
broader: Central Grampian Glacigenic Subgroup
has lower boundary definition: Sharp, undulating, erosional, unconformable contact with stony, sandy, clayey diamictons of the underlying Beinn an Uain Till Formation.
has geographical distribution: Moy Estate on Sheet 84W (Fortrose), southeast of Inverness.
has landform description: Forming ice-marginal fans.
has lithology description: Silty sandy gravel, horizontally stratified, thin-bedded, pale olive grey, with subsidiary beds of sand, clast-supported gravel and silty sandy gravel diamicton. Pebbles consist of red and grey granites, semipelitic gneiss, psammite and brown flaggy sandstone.
has thickness description: 10m
has upper boundary definition: Not overlain.

Carnmoney Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CMP
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CMP DOLR
broader: NE

Park Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: CMPB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41090
has lithology component: CMPB VCBR
has source info: CMPB_52376
broader: Beacon Hill Formation
has lower boundary definition: Not seen.
has geographical distribution: The unit probably extends laterally for several kilometres, around the nose of the south-plunging Charnwood anticline, but is only seen at Bradgate Park in the east, and by the road bridge carrying the B587 across the A50 at Raunscliffe [SK4863 1090], to the west.
has lithology description: Grey, sediment-raft volcaniclastic breccia consisting of angular, commonly elongate or raft-shaped fragments of fine-grained, laminated tuff in a coarse-grained matrix of plagioclase and quartz crystal fragments.
has thickness description: c.5m
has upper boundary definition: Gradational upward passage into grey, bedded tuffs of the Beacon Hill Formation.

Campsie Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMPL
has current status: CURRENT
has theme: BEDRCK
notation: CMPL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41091
has lithology component: CMPL CONG
has lithology component: CMPL LMST
has lithology component: CMPL MDST
has lithology component: CMPL PESST
has lithology component: CMPL SDST
has source info: CMPL_51673
has source info: CMPL_51981
has source info: CMPL_52867
has obsolete equivalent: CMPL mn 767
has obsolete equivalent: CMPL SYLS
has obsolete equivalent: CMPL mn 3327
broader: SCN
has lower boundary definition: The base of the clastic, generally conglomeratic beds, with limestone concretions, above the cross-bedded sandstones within the Scone Sandstone Formation.
has geographical distribution: The Strathmore Syncline, in the northern part of the Midland Valley of Scotland.
has lithology description: Predominantly sandstones with concretionary limestone beds and lenses, subsidiary conglomerate and mudstone with minor pebbly sandstone.
has thickness description: Up to 57 m thick in the type section.
has upper boundary definition: The base of the purple-brown mudstones belonging to the Cromlix Mudstone Formation

Crom Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AP
has predominant age: AP
has youngest age: AP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41092
has lithology component: CMPS PSAMM
has lithology component: CMPS PSAP
has lithology component: CMPS SEMPEL
has source info: CMPS_48861
has source info: CMPS_52150
has source info: CMPS_52568
has obsolete equivalent: CMPS mn 4452
has obsolete equivalent: CMPS mn 4456
broader: MORR
has lower boundary definition: Overlies the Vach Pelite Formation, where predominantly pelitic lithologies pass into predominaintly psammitic lithologies.
has geographical distribution: Comprises a large outcrop north of Loch Luichart, around the Carn Chuinneag intrusion, beneath large areas of Strathgarve Forest, Gabat Forest, Wyvis Forest, and the area around Loch Vaich and Gleann Mor. The north-eastern margin is defined by the faulted Old Red Sandstone unconformity, trending north-east from Loch Fleet in the north-east, to Strathglass in the south-west. It may continue to the north, on the eastern side of the Rogart Pluton at the western end of Strath Bora. The extent to the north and west of the Rogart Pluton is unclear. The eastern limit is largely defined by the Sgurr Beag Thrust running north-east to south-west from Loch Luichart (NH360620) to Dornoch Firth (NH645875). South of Loch Luichart the south-eastern extent is constrained by the Strathconnon Fault. The southern boundary is constrained by the Sgurr Beag Thrust occurring in the area from Sgurr a'
has lithology description: Well-bedded, flaggy to massive, white to pale grey and buff psammite, with abundant sedimentary structures. Garnetiferous semipelite bands are common in the lower portion, and it is locally pebbly in the upper part.
has thickness description: Not recorded.
has upper boundary definition: Overlain by the Diebidale Pelite Formation, where predominainlty psammitic lithologies pass into predominantly pelitic lithologies. The upper boundary is locally obscured by the Sgurr Beag Thrust, the Carn Chunneag-Inchbae Granite Gneiss, or the Old Red Sandstone unconformity.

Cwmere Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CeF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: CMR AROC
has lithology component: CMR CONG
has lithology component: CMR MBMT
has lithology component: CMR MDST
has lithology component: CMR SDST
broader: NP
narrower: MMB

Cwm Mawr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CMRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CMRC COAL
broader: Brithdir Member
has supplementary information: Note that this seam is within the Brithdir Member of the Pennant Sandstone Formation and should not be confused with the Cwmmawr Coal within the South Wales Middle Coal Measures Formation farther east.

Carn Mor Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CmSa
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41094
has lithology component: CMSA MDST
has lithology component: CMSA SDST
has source info: CMSA_49488
has source info: CMSA_50572
broader: SFSH
has lower boundary definition: Abrupt disconformity, marine, transgressive sandstones on the mudstones of the Great Estaurine Group.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Coarse-grained (pebbles to 3cm), bioturbated sandstone. Numerous brachiopods and belemnites, many remaining only as moulds. [Thalassinoides] burrows extend into the mudstone below the Formation.
has thickness description: 9m+
has upper boundary definition: Unconformity to mudstones of the Staffin Shale Formation.

Scottish Coal Measures Group
type: Concept
in scheme: NamedRockUnit
alternative label: CMSC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMSC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41095
has lithology component: CMSC COAL
has lithology component: CMSC FEST
has lithology component: CMSC MDST
has lithology component: CMSC SDST
has lithology component: CMSC SEATM
has lithology component: CMSC SEATS
has lithology component: CMSC SISTCC
has lithology component: CMSC SLST
has source info: CMSC_49246
has source info: CMSC_50447
has source info: CMSC_51961
has obsolete equivalent: CMSC mn 261
has obsolete equivalent: CMSC mn 3409
has obsolete equivalent: CMSC mn 983
broader: Coal Measures Supergroup
narrower: LCMS
narrower: UCMS
narrower: LWT
narrower: MCMS
has lower boundary definition: Different in different areas. (See notes in lithology).
has geographical distribution: Midland Valley of Scotland, and adjacent areas.
has lithology description: Cyclic alternation of mudstone, siltstone and sandstone with common coal seams at some levels. NOTE: FORMERLY - (1) Upper (Barren) Coal Measures. (2) Productive Coal Measures (comprising Middle Coal Measures and Lower Coal Measures). The Coal Measures of England and Wales were defined by Stubblefield and Trotter, 1957, and divided into Upper, Middle and Lower with their respective bases at the Cambriense, Vanderbeckei and Subcrenatum marine bands. MacGregor, 1960, divided the Scottish Coal Measures into Upper (Barren), with base at the Aegiranum marine band, Middle, with base at the Vanderbeckei marine band and Lower which, in the apparent absence of the Subcrenatum marine band in Scotland, he proposed should have its base at a suitable arbitrary line. The position taken for this line in different coal basins is shown in Ramsbottom, et al. 1978. It is proposed that these local bases of the Lower Coal Measures, and the boundaries defined by MacGregor for the Middle and Upper Coal Measures be retained. The long standing terms should be retained but since only the Middle Coal Measures is fully defined, they are regarded as informal. As the terms are applied differently in England and Wales, it is proposed that Scotland should be added to Coal Measures in parenthesis. The terms "Barren" and "Productive" are misleading in a Scottish context and should be dropped.
has thickness description: Variable
has upper boundary definition: Unconformity at base of Permian or younger rocks.

Combe Martin Slates Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
broader: IFS
has additional age information: ?Givetian to Frasnian.

Sliding Stone Slump Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: CMSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMSS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41098
has lithology component: CMSS MDST
has lithology component: CMSS SLST
has lithology component: CMSS VCSLST
has lithology component: CMSS VCSST
has source info: CMSS_50809
has source info: CMSS_51833
has source info: CMSS_52376
has obsolete equivalent: CMSS mn 3893
broader: CMBT
has lower boundary definition: Sharp contact on grey, laminated tuffaceous mudstones and siltstones of the Beacon Hill Formation.
has geographical distribution: The unit forms a thin 'marker horizon' in the western, southern and eastern parts of the Bradgate Formation, between The Hollies (SK 478 118) and Bradgate Park (SK 5308 1149).
has lithology description: Grey, coarse-grained volcaniclastic sandstone with abundant angular clasts and large folded and contorted rafts of grey, laminated mudstone and siltstone. Beds of volcaniclastic sandstone and siltstone become increasingly intercalated towards the top of the unit.
has thickness description: Variable, possibly up to 18m.
has upper boundary definition: Grades upwards, by decrease in proportion of beds with mudstone rafts, into volcaniclastic sandstones and siltstones of the Hallgate Member.

Cromer Till (Lowest Member)
type: Concept
in scheme: NamedRockUnit
alternative label: CMTL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: CMTL DMTN
broader: NE

Cautley Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cmu
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41099
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41100
has lithology component: CMU MDST
has lithology component: CMU RYTUF
has lithology component: CMU SDST
has source info: CMU_50137
has source info: CMU_52407
broader: Dent Group
narrower: Cautley Volcanic Member
narrower: WIL
has lower boundary definition: Not exposed, but taken at the base of the lowest bed of mudstone overlying a small exposure of purple andesite, putatively belonging to the Borrowdale Volcanic Group.
has geographical distribution: Restricted to the Cautley and Dent districts of Cumbria.
has lithology description: Calcareous mudstone with impersistent limestone beds; includes units of sandstone at the base and higher in the succession [Wilsey Beck Sandstone Member]; also of rhyolitic tuff [Cautley Volcanic Member].
has thickness description: Up to 570m
has upper boundary definition: Taken at the unconformity with the overlying Ashgill Formation.

Maplewell Group
type: Concept
in scheme: NamedRockUnit
alternative label: CMV
has current status: CURRENT
has theme: BEDRCK
notation: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41101
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41102
has lithology component: CMV TFAMST
has lithology component: CMV TFASST
has lithology component: CMV TFSLST
has lithology component: CMV TUF
has lithology component: CMV VCBR
has source info: CMV_48789
has source info: CMV_50921
has source info: CMV_51833
has source info: CMV_52376
has obsolete equivalent: CMV mn 2745
broader: Charnian Supergroup
narrower: Beacon Hill Formation
narrower: CMBT
narrower: Charnwood Lodge Volcanic Formation
narrower: BRTU
has lower boundary definition: Coarse-grained tuffs and breccias of the Benscliffe Breccia Member sharply overlie green-grey thinly bedded to laminated fine- to medium-grained volcaniclastic beds of the Blackbrook Reservoir Formation.
has geographical distribution: The unit is distributed within the centre and flanks of the Charnwood anticline, generally between Nanpantan, Benscliffe Wood and High Sharpley.
has lithology description: Varied sequence of meta volcaniclastic and meta tuffaceous sandstones, siltstones and mudstones with vitric tuffs and volcanic block-breccias (mainly dacitic).
has thickness description: Approximately 2000m
has upper boundary definition: Sharply, possible unconformably overlain by the Brand Group. Latter consists locally of small-pebble conglomerate or coarse-grained volcaniclastic sandstone of the Hanging Rocks Conglomerate Formation.

Craig Of Monievreckie Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CMVC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41104
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41105
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41103
has lithology component: CMVC BA
has lithology component: CMVC CONG
has lithology component: CMVC PESST
has lithology component: CMVC SDST
has source info: CMVC_49343
has source info: CMVC_51673
has obsolete equivalent: CMVC mn 4505
broader: Arbuthnott-Garvock Group
narrower: Balleich Lava Member
narrower: Bofrishlie Burn Sandstone Member
has lower boundary definition: A faulted contact to the north-east of Aberfoyle.
has geographical distribution: The north-west limb of the Strathmore Syncline, from Maol Ruadh to north of Callander.
has lithology description: A clast supported conglomerate, with some bimodal sorting seen as generally massive volcanic clasts near the base of the unit, giving way to quartzite and psammite upwards and south-westwards along strike. Subsidiary sandstones include the Bofrishlie Burn Sandstone member, located below the basaltic Balleich Lava Member.
has thickness description: Up to 1200 m thick.
has upper boundary definition: A pronounced diachronous transitional contact with the conglomeratic or sandstone facies of the Ruchill Flagstone Formation.

Coal Measures Group And Warwickshire Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CMWK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
has lithology component: CMWK AROC
has lithology component: CMWK COAL
has lithology component: CMWK CONG
has lithology component: CMWK LMST
has lithology component: CMWK MDST
has lithology component: CMWK SDST
has lithology component: CMWK SEATS
has lithology component: CMWK SLST
broader: NP

Colinburn Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: CN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CN COAL
has lateral equivalent: CN st 419
has lateral equivalent: CN st 231
has lateral equivalent: CN st 423
broader: LCMS

Canna Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: CNAL LAVA
has source info: CNAL_48866
broader: NE
narrower: ORVAL
narrower: Guirdil Member
narrower: UFION
narrower: Tighard Member
narrower: Cnoc Bhrostan Member
narrower: Carn A' Ghaill Member
narrower: Beul Lama Sgorr Member
narrower: Eilean A' Bhaird Member

Basal Member (Canna Lava Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL1 BA
has lithology component: CNAL1 BATUF
has lithology component: CNAL1 CONG
has lithology component: CNAL1 FPBA
broader: NE

Tighard Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL2 BA
has lithology component: CNAL2 CONG
has lithology component: CNAL2 PXPBA
broader: Canna Lava Formation

Cnoc Bhrostan Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL3 BA
has lithology component: CNAL3 CONG
has lithology component: CNAL3 FPBA
broader: Canna Lava Formation

Carn A' Ghaill Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL4 BA
has lithology component: CNAL4 CONG
has lithology component: CNAL4 FPHAW
has lithology component: CNAL4 HAW
broader: Canna Lava Formation

Beul Lama Sgorr Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL5
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL5 FPHAW
has lithology component: CNAL5 HAW
broader: Canna Lava Formation

Eilean A' Bhaird Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNAL6
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CNAL6 BAANDT
has lithology component: CNAL6 CONG
broader: Canna Lava Formation

Carron Basalt Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CnB
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41106
has lithology component: CNB BALAVA
has lithology component: CNB BREC
has lithology component: CNB OLBA
has lithology component: CNB SDST
has source info: CNB_52156
has obsolete equivalent: CNB mn 3288
broader: STEW
has lower boundary definition: Rests with irregular contact on Carboniferous Coal Measures strata.
has geographical distribution: Between Glenvalentine (NS 880 077) and Thornhill area (NX 880 950) in the Thornhill Basin; also at Locherben (NX 953 970).
has lithology description: Olivine basalt lava flows interbedded with thin breccias and sandstones.
has thickness description: 20m.
has upper boundary definition: Overlain by sandy breccias and sandstone of the Durisdeer Formation.

Coronation Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: CNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CNC COAL
broader: LCMS

Concretionary Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNCL
has current status: CURRENT
has theme: BEDRCK
notation: CNCL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41108
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41107
has lithology component: CNCL DOLO
has source info: CNCL_49811
has source info: CNCL_50084
has source info: CNCL_50967
has source info: CNCL_51331
has obsolete equivalent: CNCL mn 4417
has obsolete equivalent: CNCL mn 1022
broader: ROD
has lower boundary definition: Gradational, by interdigitation with the underlying Hartlepool Anhydrite Formation.
has geographical distribution: Durham Province, onshore and offshore outcrops, of the English Zechstein Group: County Durham, Tyne and Wear, Cleveland and northernmost North Yorkshire.
has lithology description: Lithologically varied dolostone with calcite concretions formed by a variety of primary and secondary sedimentary processes. Interpreted as the basin slope deposit of the Roker Formation (see Smith, 1994, fig.46 on page 94).
has thickness description: Up to a maximum of about 95 - 100m.
has upper boundary definition: Base of the overlying Forden Evaporite Formation, marked by the incoming of anhydrite and halite.

Cnoc Nan Cuilean Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CNCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Namurian To Stephanian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CNCSU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CS
broader: NA

Clanyard Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CND
has current status: CURRENT
has theme: BEDRCK
notation: CND
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41109
has lithology component: CND MDST
has lithology component: CND SLMDST
has lithology component: CND WACKE
has source info: CND_52598
broader: Gala Group
has lower boundary definition: Conformable on Moffat Shale Group at Clanyard Bay.
has geographical distribution: Not defined.
has lithology description: Thick-bedded greywacke with interbedded thin black shale bands and thick ( up to 40 metres) silty mudstone units.
has thickness description: Not defined.
has upper boundary definition: Faulted.

Craig Hen-Gae Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OL
has predominant age: OL
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41110
has lithology component: CNE MDST
has lithology component: CNE SLST
has source info: CNE_49215
has source info: CNE_51180
has source info: CNE_51715
has source info: CNE_52779
has obsolete equivalent: CNE mn 4347
has lateral equivalent: CNE GEL
broader: Ceiswyn Formation
has lower boundary definition: Conformably overlies the main part of the Ceiswyn Formation, the boundary being taken where laminated hemipelagic mudstones become equal or dominant in the sequence.
has geographical distribution: Cadair Idris district, North Wales.
has lithology description: Black hemipelagic mudstones, thinly interbedded with grey turbiditic mudstones and siltstones.
has thickness description: 200 to 300m
has upper boundary definition: Conformably overlain by the Nod Glas Formation, the boundary being taken where the turbidite mudstone disappears and the sequence consists wholly of black, graptolitic, pelagic mudstone.

Coronea Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNEA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: STRO

Cannel Coal (Midgeholm)
type: Concept
in scheme: NamedRockUnit
alternative label: CNEL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CNEL COAL
broader: PLCM

Coire Nan Easan Tuffs
type: Concept
in scheme: NamedRockUnit
alternative label: CNET
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Dalness Ignimbrite Member

Confinis Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CNF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41111
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41112
has lithology component: CNF CALSST
has source info: CNF_50759
has source info: CNF_51755
has source info: CNF_52760
has obsolete equivalent: CNF mn 1023
has obsolete equivalent: CNF mn 3162
has obsolete equivalent: CNF mn 1024
broader: Barr Group
narrower: MNN
has lower boundary definition: Overlies and is partly lateral equivalent of Auchensoul Bridge Mudstone.
has geographical distribution: Stinchar Valley area, Girvan.
has lithology description: Blue-grey calcareous flaggy sandstone.
has thickness description: 50m
has upper boundary definition: Overlain conformably by the Stinchar Limestone Formation.

Canonbie Nine Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CNFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CNFC COAL
broader: MCMS

Caithness Flagstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CNFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has lithology component: CNFL LMST
has lithology component: CNFL MDST
has lithology component: CNFL SDST
has lithology component: CNFL SLST
has source info: CNFL_52763
broader: ORS
narrower: LCF
narrower: Dounreay Shore Formation
narrower: MPSA
narrower: HSK
narrower: UCF
narrower: HEL
narrower: HIH
narrower: USF
narrower: MAPA
narrower: LSF
narrower: LSU
narrower: Crosskirk Bay Formation
narrower: SABA
narrower: Bighouse Formation
has lower boundary definition: Top of red bed sandstones of Yesnaby Sandstone Group in Orkney and of Sarclet Group in Caithness.
has geographical distribution: Orcadian Basin - Shetland to Moray Firth, Northern Scotland.
has lithology description: Flagstone, rhythmic mudstone-limestone, siltstone, sandstone units. NOTE: See component formations for Type Sections.
has thickness description: + 2000m.
has upper boundary definition: Base of yellowish brown sandstones of the Orkney Sandstone Group .

Charlestown Green Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CNGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: LLGS

Carnduff Halite
type: Concept
in scheme: NamedRockUnit
alternative label: CNH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
broader: NE

Craignook Coals (Midgeholm)
type: Concept
in scheme: NamedRockUnit
alternative label: CNKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CNKC COAL
broader: PLCM

Craignook Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CNKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CNKS SDST
broader: PLCM

Chipping Norton Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CNL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41114
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41116
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41115
has lithology component: CNL CAMDST
has lithology component: CNL LIGN
has lithology component: CNL LMOOL
has lithology component: CNL MDST
has lithology component: CNL SANDU
has source info: CNL_49459
has source info: CNL_50661
has source info: CNL_51238
has source info: CNL_52334
has obsolete equivalent: CNL mn 913
has obsolete equivalent: CNL mn 912
broader: Great Oolite Group
has additional age information: Middle Jurassic, Bathonian (Zigzag Zone) (Possibly extending into adjoining zones).
has lower boundary definition: Conformable/non-sequential on fine- to coarse-grained ooidal and peloidal limestone, locally ironshot, of Clypeus Grit Member. Oversteps northeastwards to rest non-conformably on Grantham Formation, Northampton Sand Formation and Whitby Mudstone Formation.
has geographical distribution: North Gloucestershire to north Oxfordshire, where it passes northeastwards(on BGS 1:50 000 sheet 218) into the Horsehay Sand Formation (shown on 1968 edition of sheet 218 as the 'Lower Estuarine Series', now known as the Grantham Formation, but now thought to be generally absent south of Kettering).
has lithology description: Limestone, off-white to pale brown fine- to medium-grained ooidal and coated peloidal grainstone, with common fine burrows, medium- to coarse-grained shell debris and flakes of greenish grey mudstone and dark lignite and minor amounts of fine-grained sand. Thick-bedded and cross-bedded or massive, weathering to flaggy or platy. Thin shell-detrital and ooidal marl and mudstone intercalations in places. Becoming very sandy eastward ("Swerford Beds" facies). Locally a mudstone bed ("Roundhill Clay" of Richardson, L, 1929) up to c.1m thick occurs at the base.
has thickness description: 0 to 12m
has upper boundary definition: Rapid passage upwards into mudstone-dominated Fuller's Earth Formation or Sharp's Hill Formation.

Cannel Coal (Machrihanish)
type: Concept
in scheme: NamedRockUnit
alternative label: CNLC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CNLC COAL
broader: NE

Coire Nan Laogh Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNLH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41117
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41118
has lithology component: CNLH CALSIR
has lithology component: CNLH PSAMI
has lithology component: CNLH PSAMM
has lithology component: CNLH QZITE
has lithology component: CNLH SEMPEL
has lithology component: CNLH SPELGN
has lithology component: CNLH SPSCH
has source info: CNLH_48968
has source info: CNLH_51925
broader: Corrieyairack Subgroup
has lower boundary definition: Sharp contact with underlying grey feldspathic psammites of the Gairbeinn pebbly psammite member - well exposed in Garbh Choire [NN 4628 9895] and south of Uinneag Mhin Choire [NN 4651 9955].
has geographical distribution: Central Highlands of Scotland, sheets 63W, 63E and 74W.
has lithology description: Schistose to gneissose semipelite, garnetiferous, with interbanded micaceous psammite. Minor feldspathic and siliceous psammite beds; calc-silicate lenses common.
has thickness description: c. 500 m.
has upper boundary definition: Transitional through upper psammite and semipelite unit defined by incoming of thick turbiditic psammites of the Loch Laggan Psammite Formation.

Cornelly Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41119
has lithology component: CNLL LMOOL
has lithology component: CNLL LMST
has lithology component: CNLL MDST
has source info: CNLL_48717
has source info: CNLL_50514
has obsolete equivalent: CNLL mn 3813
broader: Hunts Bay Oolite Subgroup
narrower: Cefnyrhendy Oolite Member
narrower: Argoed Limestone Member
has lower boundary definition: The base of the formation is gradational and taken at the incoming of a predominantly oolitic grainstone sequence above the skeletal packstones or skeletal/oolitic packstone/grainstones of the underlying High Tor Limestone Formation.
has geographical distribution: Central and western Vale of Glamorgan [ST 00 74]. Passes eastwards into undivided Hunts Bay Oolite Subgroup. Present in Gower [SS 50 90] and Pembrokeshire [SM 99 01], but not mapped.
has lithology description: Thick bedded, cross bedded, pale grey ooid grainstones with scattered beds of medium grey fine-grained skeletal packstone. Compound ooids of pisolitic proportions common. Thin mudstone associated with the palaeokarstic surface at the top of the Cefnyrhendy Oolite Member, present in the northeast of the Vale of Glamorgan.
has thickness description: 135m in the west of the Vale of Glamorgan, thickening to 180m in the eastern part of the Vale of Glamorgan.
has upper boundary definition: The top of the formation is taken at the base of the first bed of calcite mudstone of the overlying Stormy Limestone Formation occuring above the ooid grainstones and subordinate skeletal packstones of the Cornelly Oolite Formation.

Carn Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: Dartry Limestone Formation

Carnallitic Marl
type: Concept
in scheme: NamedRockUnit
alternative label: CNM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Cannapark Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CNPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
is obsolete equivalent of: CNPL TCH
broader: NE

Cannel Row Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CNRC
has current status: CURRENT
has theme: BEDRCK
notation: Ca
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CNRC COAL
broader: PUCM

Coire Na Rainich Hybrid Ring-Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: CNRH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: RG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CNRH DOLRQ
has lithology component: CNRH MCGN
broader: Ardnamurchan Centre 3

Chipping Norton Limestone Formation And Rutland Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CNRL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: CNRL CAMDST
has lithology component: CNRL CLAY
has lithology component: CNRL LIGN
has lithology component: CNRL LMST
has lithology component: CNRL MDST
has lithology component: CNRL SANDU
has lithology component: CNRL SILT
broader: Great Oolite Group
has lithology description: See the Lithology descriptions for the component formations.

Coire Na Rainich Peridotite Raft
type: Concept
in scheme: NamedRockUnit
alternative label: CNRP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CNRP PDTFC
broader: Ardnamurchan Centre 3

Caran Sandstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: CNSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: HORD

Crendon Sand
type: Concept
in scheme: NamedRockUnit
alternative label: CNSD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JP
has predominant age: JP
has youngest age: JP
broader: NE

Carleton Silt Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNSI
has current status: CURRENT
has theme: SPRFCL
notation: CS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41121
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41120
has lithology component: CNSI CLAY
has lithology component: CNSI SILT
has source info: CNSI_48926
has source info: CNSI_49633
has source info: CNSI_50151
broader: ISCG
has lower boundary definition: Sharp, gently undulating, unconformable, draped contact with underlying stony sandy clay diamicton of the Maudsyke Till Member of the Blengdale Glacigenic Formation.
has geographical distribution: West Cumbria.
has lithology description: Silt and clay, laminated, very stiff, pinkish grey, dusky red and light reddish brown (Munsell Soil). Laminae up to 10 mm thick, fining upwards.
has thickness description: To 11.6m
has upper boundary definition: Gradational, conformable contact with overlying dark brown calcareous clay of the Carleton Hall Clay Member of the Glannoventia Formation.

Canisp Porphyry Sills
type: Concept
in scheme: NamedRockUnit
alternative label: CNSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SC
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CNSP MCDIP
broader: NWHIM

Cnoc Na Sroine Quartz-Syenite
type: Concept
in scheme: NamedRockUnit
alternative label: CNSQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Creag Na Sanais Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNSS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41122
has lithology component: CNSS PSAMI
has lithology component: CNSS PSMQZ
has lithology component: CNSS SPELGN
has source info: CNSS_51186
has obsolete equivalent: CNSS mn 3213
broader: Glen Spean Subgroup
has lower boundary definition: Top of the predominantly psammite beds belonging to the Creag Dhubh Psammite Formation, below the predominantly semipelitic beds of the Creag na Sanais Semipelitic Formation.
has geographical distribution: South of Newtonmore, west of Crubenmore on Sheet 64W
has lithology description: Dark grey gneissose semipelite composed mainly of muscovite, biotite, quartz, some plagioclase and garnet, with local thin fine-grained biotite-rich and quartoze psammite interbeds.
has thickness description: 100 - 200m
has upper boundary definition: Base of the predominantly psammitic Allt nam Biorag Member, Fara Psammite Formation, above the predominantly semipelitic beds of the Creag na Sanais Semipelite Formation.

Cefnnantmel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cnt
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OU
has predominant age: OU
has youngest age: OU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41123
has lithology component: CNT MDST
has lithology component: CNT SDST
has lithology component: CNT SHSST
broader: NTM
has lower boundary definition: Taken at sharp incoming of sandstone dominated sequence above burrow mottled mudstones with sparse thin sandstones.
has geographical distribution: Central Wales.
has lithology description: Cross-laminated thin sandstones with subordinate mudstones. Rich shelly fauna.
has thickness description: Not defined.
has upper boundary definition: Gradational but taken at incoming of mudstone dominated sequence of burrow mottled mudstones with sparse thin sandstones.

Con Tom Member
type: Concept
in scheme: NamedRockUnit
alternative label: CNTM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Port Askaig Tillite Formation

Carnhill Mugearite
type: Concept
in scheme: NamedRockUnit
alternative label: CNU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Cairnharrow Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CNW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41124
has lithology component: CNW SLMDST
has lithology component: CNW WACKE
broader: HWK
has lower boundary definition: Faulted.
has geographical distribution: Not defined.
has lithology description: Thin- to medium-bedded greywacke with variable proportion of interbedded silty mudstone including some thick (to 40m) units. Includes pockets of distinctive thick-bedded parallel laminated greywacke with abundant concretions.
has thickness description: Not defined.
has upper boundary definition: Faulted.

Cheshire - North Wales Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: CNWCA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41125
has lithology component: CNWCA C
has lithology component: CNWCA P
has lithology component: CNWCA S
has lithology component: CNWCA V
has lithology component: CNWCA Z
has source info: CNWCA_50525
has source info: CNWCA_50596
has source info: CNWCA_51617
has obsolete equivalent: CNWCA mn 4088
has obsolete equivalent: CNWCA LTHM
broader: Britannia Catchments Group
narrower: MSYVA
narrower: Conwy Valley Formation
narrower: WVRVA
narrower: Clwyd Valley Formation
narrower: Dee Valley Formation
has lower boundary definition: Probably unconformable and in places strongly incised into highly variable sediments of the Caledonia or Albion Glacigenic groups and bedrock.
has geographical distribution: Catchments of Cheshire and North Wales including the valleys and tributaries of the rivers Mersey, Weaver, Dee, Clwyd and Conway.
has lithology description: Alluvial silt, sand, clay and gravel with some peat. Associated River Terraces are dominated by sand and gravel, gravelly sand or sandy gravel with rare clay and silt. The Subgroup also includes coastal and inland basin peat and a variety of mass movement deposits.
has thickness description: Highly variable depending on the relative stratigraphical positions of each of the component units. In the major river valleys the thickness may vary between 2 and 5m, but probably does not exceed 10m. For deposits flanking the major river valleys, the thickness probably ranges between 1 and 3m.
has upper boundary definition: Ground surface or unconformable below artificial deposits.

Clanyard Bay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CNY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: HWK

Conybeare Group
type: Concept
in scheme: NamedRockUnit
alternative label: CNYB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
broader: NE
narrower: SCNR
narrower: Caister Coal Formation
narrower: WSCO
narrower: Brig Formation

No.1 Comrie Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CO1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lateral equivalent: CO1 st 118
has lateral equivalent: CO1 st 444
has lateral equivalent: CO1 st 620
has lateral equivalent: CO1 st 871
broader: LSC

No.2 Comrie Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CO2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lateral equivalent: CO2 LYBI
has lateral equivalent: CO2 st 518
broader: LSC

No.3 Comrie Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CO3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: LSC

Coalsnaughton Main Coal (Clackmannan)
type: Concept
in scheme: NamedRockUnit
alternative label: COAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: COAM COAL
broader: LCMS

British Coastal Deposits Group
type: Concept
in scheme: NamedRockUnit
alternative label: COAS
has current status: CURRENT
has theme: SPRFCL
notation: COA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41126
has lithology component: COAS CLAY
has lithology component: COAS DMTN
has lithology component: COAS GRAV
has lithology component: COAS PEAT
has lithology component: COAS SANDU
has lithology component: COAS SILT
has source info: COAS_49636
has source info: COAS_50918
has source info: COAS_51617
has source info: COAS_52633
broader: Great Britain Superficial Deposits Supergroup
narrower: SCMBS
narrower: SE
narrower: Errol Clay Formation
narrower: Carse Clay Formation
narrower: Clydebank Clay Formation
narrower: Easington Raised Beach Formation
narrower: Forth Clay Formation
narrower: MORS
narrower: SLEV
narrower: SURF
narrower: Glannoventia Formation
narrower: Hall Carleton Formation
narrower: WLLEV
narrower: YNYSS
narrower: POA
narrower: KEBR
narrower: KNFIG
narrower: Clyde Clay Formation
narrower: NRD
narrower: OALEV
narrower: SFSI
narrower: UWIS
narrower: LTHM
narrower: SSA
narrower: Grange-Over-Sands Formation
narrower: Ayre Formation
narrower: Fenland Formation
narrower: Drigg Point Sand Formation
narrower: RSBQD
narrower: RSBQF
narrower: Breydon Formation
narrower: Burtle Formation
narrower: Gwent Levels Formation
has lower boundary definition: Unconformable contact with units of the Britannia Catchments Group, the Caledonia Glacigenic Group, the Albion Glacigenic Group, the Dunwich and/or Crag groups, and bedrock.
has geographical distribution: The British Isles excluding Ireland.
has lithology description: A suite of near-shore marine, coastal and estuarine deposits of sand, gravel, silt, clay and peat that contain clasts derived from rocks cropping out throughout Great Britain and the Isle of Man. Includes glacio-isostatically uplifted [raised] deposits lying to the north of a hinge-line crossing northern England between the Ribble and Tyne, and isostatically uplifted Interglacial shoreline deposits around the coast of southern Britain.
has thickness description: To 80m
has upper boundary definition: Generally the ground surface, but units of this Group commonly interfinger with units of the Britannia Catchments Group. Raised beaches of Late Devensian age commonly interdigitate with units of the Caledonia Glacigenic Group.

Cosheston Group
type: Concept
in scheme: NamedRockUnit
alternative label: COB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41127
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41129
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41130
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41132
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41133
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41134
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41128
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41131
has lithology component: COB BREC
has lithology component: COB CAMDST
has lithology component: COB CONG
has lithology component: COB SDST
has lithology component: COB SLST
has source info: COB_49936
has source info: COB_51335
has source info: COB_51871
has obsolete equivalent: COB mn 1074
is obsolete equivalent of: COB NWS
is obsolete equivalent of: COB LWC
broader: NA
narrower: LLSW
narrower: NWS
narrower: LWC
narrower: MBY
has lower boundary definition: The base of the group is coincident with the base of the Llanstadwell Formation. This is placed at the base of the lowest primary-coloured green bed at the western end of the railway cutting in the naval depot at Newton Noyes, Pembrokeshire [SM 9150 0530]. This is a 0.32m thick greenish grey, coarse grained, parallel-laminated siltstone 21.7m above the base of the section logged by Thomas et al (2006), which lies conformably on red mudstones of the underlying Gelliswick Bay Formation (formerly Red Marl Group).
has geographical distribution: The Group comprises an area of 27 square km in the Milford Haven area, south Pembrokshire. It mainly crops out in the Burton Anticline, between the Benton Fault in the north [c.SM 97 08] to near Cosheston [SN 003 034] in the south, and from Llanstadwell [SM 95 05] in the west to New Shipping [SN 04 04] in the east. A smaller outlier to the west of the main outcrop extends from Newton Noyes [SM 92 05] in the west to Wear Point [SM 940 043] in the east.
has lithology description: Predominantly grey-green very fine- to coarse-grained, plant-bearing sandstones, red-brown and purple-brown siltstones; some intraformational conglomerates in the lower part (Llanstadwell and Mill Bay formations); extraformational conglomerates in the upper part (Lawrenny Cliff and New Shipping formations), becoming dominant at the top of the Group (New Shipping Formation). The rocks are arranged predominantly in fining-upward rhythms.
has thickness description: To 1800m
has upper boundary definition: The upper boundary is not seen, the highest (New Shipping) Formation being unconformably overlain by strata of the Avon Group (formerly the Lower Limestone Shales) of early Carboniferous age. This junction is seen on the shore on the east side of the Carew River [SN 03852 04105] southsoutheast of New Shipping Point. It is a scour surface with up to 2cm relief cut in medium- to coarse-grained purple sandstone overlain by a bed of quartz grit up to 4cm thick with shell fragments.

Coatbridge Balmoral Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: COBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: COBC COAL
broader: LCMS

Coastal Barrier Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: COBD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: COBD GRAV
has lithology component: COBD SANDU
broader: STDU
has lithology description: Sand or gravel; form a major longshore bar, the surface of which is below the mean still water level. [Generic description: earth science dictionaries in the BGS library].

Cockburn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COBN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: NM
has predominant age: NM
has youngest age: NM
broader: NE

Corrieyairack Subgroup And Glen Banchor Succession (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: COBS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: COBS PSAMM
has lithology component: COBS SPELGN
broader: NA

Cockburns Law Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: COBU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: COBU GNR
broader: SSCGR

Conwy Castle Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: COC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has lithology component: COC SDST
broader: Conwy Mudstones Formation

Corbie Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: COCG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COCG COAL
broader: LSC

Coire Cheap Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41137
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41135
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41136
has lithology component: COCH AMPHB
has lithology component: COCH CALSIR
has lithology component: COCH MCABR
has lithology component: COCH MLMST
has lithology component: COCH PEL
has lithology component: COCH PSAMI
has lithology component: COCH SCHGR
has lithology component: COCH SEMPEL
has source info: COCH_52636
broader: Ballachulish Subgroup
narrower: Kinlochlaggan Limestone
has lower boundary definition: Sharp base at the marked quartzite-pelite / semipelite boundary at the top of the Kinlochlaggan Quartzite Formation. Alternatively lies above the Kinlochlaggan 'Boulder Bed'.
has geographical distribution: Ardverikie Forest between Aonach Beag [NN 455 740] and the River Spey at [NN 933 571], sheet 63E [Dalwhinnie].
has lithology description: Semipelite and pelite, schistose to gneissose and locally kyanite-rich, containing calc-silicate rock and metalimestone units. Cut by abundant amphibolite sheets.
has thickness description: Not known, but at least 200m
has upper boundary definition: Not seen ie. this is the youngest unit exposed in the major Kinlochlaggan syncline.

Cairnsmore Of Carsphairn Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: COCI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: COCI DIR
has lithology component: COCI GD
has lithology component: COCI GN
has lithology component: COCI MCGN
broader: SSCGR

Coire Na Circe Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COCIR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: COCIR BA
has lithology component: COCIR HAW
broader: SKYL

Cock Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: COCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: COCK COAL
broader: Downend Member
has lithology description: Coal seam

Coagh Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: COCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Coolcran Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: COCM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Corston Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: COCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: COCO COAL
broader: Downend Member

Corbie Craig Coal
type: Concept
in scheme: NamedRockUnit
alternative label: COCR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COCR COAL
broader: LSC

Combe Down Oolite
type: Concept
in scheme: NamedRockUnit
alternative label: CODO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
broader: NE

Combe Downs Member
type: Concept
in scheme: NamedRockUnit
alternative label: CODS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41138
has lithology component: CODS LMST
has lithology component: CODS MDST
has lithology component: CODS SDST
has lithology component: CODS SLST
broader: PLT
has lower boundary definition: The base is taken where the base of the lowermost bed of sandstone or siltstone of the Combe Downs Member rests conformably upon pale to mid grey or purplish grey mudstone of the Pilton Mudstone Formation.
has geographical distribution: Mapped from east of Shillingford [SS 993 244] to west of Bathealton [ST 068 249] on the Tiverton Sheet (310). Expected to occur more extensively on the southern part of the Dulverton Sheet (294), where a type locality might be found, leading to a more suitable name for the Member.
has lithology description: Pale to mid grey to pale brown, ochreous-weathered or purple mottled, very fine- to fine-grained, locally micaceous sandstone interbedded with purplish grey, pale brown, pink or red-brown, finely micaceous siltstone, mid grey, purple-grey and red-brown mudstone and thin limestone beds. The limestone beds, to 0.1m thick, are typically soft and comprise mid grey, sparry calcarenite with abundant shelly material. Limestone and sandstone interbeds on the centimetre-scale are locally seen. Sandstone beds are typically 30cm thick, but in places coalesce to form thicker sandstone packages to 60cm thick. Sandstone and siltstone beds are commonly thinly planar laminated or cross laminated, locally massive. Mudstone beds range from thinly laminated or thinly bedded to massive. Crinoid ossicles and intact stems and brachiopod valves are locally common in all lithologies.
has thickness description: c.200m, but difficult to determine due to folding and faulting.
has upper boundary definition: The top is taken where the top of the uppermost bed of sandstone and siltstone is conformably overlain by silvery pale greenish grey fissile mudstone of the Pilton Mudstone Formation.

Coddington Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CODT
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: CT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41139
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41140
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41141
has lithogenesis: GLACI
has lithology component: CODT CLAY
has lithology component: CODT DMTN
has lithology component: CODT SILT
has source info: CODT_50448
broader: NE
has lower boundary definition: Placed generally where the till overlies the clays and silts of the underlying White House Silts. Locally, the base rests on Mathon Sand and Gravel.
has geographical distribution: Cradley - Glynch Brook Valleys, Herefordshire.
has lithology description: Consolidated, red silty clay or clayey silt with pebbles to boulders of local and exotic lithologies.
has thickness description: Maximum proved thickness of c.10 metres.
has upper boundary definition: Placed at junction of red till and overlying grey to yellow-brown stony clay solifluction/gelifluction deposits of Colwall Gelifluctate.

Coedana Complex
type: Concept
in scheme: NamedRockUnit
alternative label: COED
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41142
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41143
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41144
has lithology component: COED GN
has lithology component: COED GNSS
has lithology component: COED HNFELS
has source info: COED_49340
has source info: COED_51189
has source info: COED_52478
has obsolete equivalent: COED COEDG
broader: NA
narrower: Coedana Granite
narrower: NMG
has additional age information: Late Neoproterozoic.
has lower boundary definition: Unknown.
has geographical distribution: Anglesey Special 1:50 000 Geological Sheet, but unit probably extends offshore. Comprises a belt of rocks that extends NE-SW across central Anglesey, but is also found in thrust slices in NW Anglesey, and in inliers surrounded by younger strata. Lateral boundaries unknown; certainly faulted in part, but with igneous contacts and metamorphic gradients also.
has lithology description: Migmatitic pelites and semi-pelites, calc-silicate gneisses, amphibolites and granite, with hornfelsed aureole.
has thickness description: Unknown.
has upper boundary definition: Unknown.

Coedana Granite
type: Concept
in scheme: NamedRockUnit
alternative label: COEDG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41145
has lithology component: COEDG GN
has lithology component: COEDG GNGNS
has source info: COEDG_49340
has source info: COEDG_49608
has source info: COEDG_50510
has source info: COEDG_51348
has source info: COEDG_51760
is obsolete equivalent of: COEDG COED
broader: Coedana Complex
has additional age information: Late Neoproterozoic.
has lower boundary definition: Unknown.
has geographical distribution: Anglesey, North Wales.
has lithology description: Porphyritic alkali-feldspar granite, commonly mylonitised.
has thickness description: Unknown.
has upper boundary definition: Unknown.

Coleford Member
type: Concept
in scheme: NamedRockUnit
alternative label: COFD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41146
has lithology component: COFD COAL
has lithology component: COFD FEST
has lithology component: COFD MDST
has lithology component: COFD SDST
has source info: COFD_49279
has source info: COFD_50039
has source info: COFD_52308
has obsolete equivalent: COFD mn 1006
broader: PES
narrower: Coleford High Delf Coal (Forest Of Dean)
has lower boundary definition: Taken at the base of the lowermost sandstone of 'Pennant'-type (lithic arenite) of the Coleford Member. Occurs conformably above coarse-grained sandstone of the Trenchard Formation in the north of the Forest of Dean Coalfield and unconformably upon limestone and sandstone of the Pembroke Limestone Group in the south.
has geographical distribution: Restricted to the Forest of Dean Coalfield (SO 60).
has lithology description: Predominantly a thick-bedded, coarse-grained sandstone of "Pennant"-type (lithic arenite), with subordinate interbeds of grey and green mudstone with ironstone concretions and coal. The sandstone is trough cross-bedded to planar bedded and beds commonly show erosive scours. Sandstone beds from beneath the Coleford High Delf seam are typically fine- to medium-grained. Coal seams up to 1.5 m thick are present within the succession.
has thickness description: 180m in the north to 300m in the south of the Forest of Dean Coalfield.
has upper boundary definition: Taken at the base of the Brazilly Coal, present at the base of a grey mudstone- dominated succession of the Cinderford Member of the Grovesend Formation. The coal rests conformably upon thick-bedded, coarse-grained sandstone of the Coleford Member.

Cairnsmore Of Fleet Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: COFG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: COFG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41148
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41147
has lithology component: COFG GN
has lithology component: COFG MCGNA
has source info: COFG_49256
has source info: COFG_49516
has source info: COFG_50568
has source info: COFG_51372
has source info: COFG_51579
has source info: COFG_51781
has source info: COFG_52229
has obsolete equivalent: COFG mn 744
broader: Galloway Granitic Suite
narrower: Fleet Pluton (Phase 1)
narrower: Fleet Pluton (Phase 2)
has lower boundary definition: Intrusive margin of the pluton against surrounding contact metamorphosed rock.
has geographical distribution: The pluton is exposed in south-west Scotland. It extends from Cairnsmore [NX 49 65] in the south-west to New Galloway [NX 62 76] in the north-east.
has lithology description: The pluton is compositionally zoned comprising a marginal coarse-grained feldspar-phyric granite enclosing a central fine- to medium-grained aphyric granite. The outer zone has been divided into a marginal biotite-granite and an inner biotite-muscovite-granite.
has thickness description: Geophysical studies indicate that it extends to a depth of 10 - 12km. (Parslow, 1968; Parslow and Randall, 1973).
has upper boundary definition: Not applicable.

Fleet Pluton (Phase 1)
type: Concept
in scheme: NamedRockUnit
alternative label: COFG1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Cairnsmore Of Fleet Pluton

Fleet Pluton (Phase 2)
type: Concept
in scheme: NamedRockUnit
alternative label: COFG2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: Cairnsmore Of Fleet Pluton

Cosham Flint
type: Concept
in scheme: NamedRockUnit
alternative label: COFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: SPCH

Coed Ffyddlwn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COFYD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41149
has lithology component: COFYD DOLO
has lithology component: COFYD LMMC
has lithology component: COFYD MDST
has source info: COFYD_48805
has source info: COFYD_51233
has obsolete equivalent: COFYD mn 350
broader: Clydach Valley Subgroup
narrower: Darren Ddu Limestone Member
has lower boundary definition: The base is a sharp junction between the topmost ooidal grainstone of the underlying Blaen Onnen Oolite Formation and the basal dolostones of the Coed Ffyddlwn Formation.
has geographical distribution: Northeast crop of the South Wales Coalfield, from Chwar Pant-y-rhiw [SO 2020 1560] southeast to about the area of Gallowsgreen Quarry, Varteg Hill [SO 2662 0677].
has lithology description: The lower part comprises fine-grained dolostones, the upper part (the Darren Ddu Limestone Member) comprises thinly bedded micritic limestones, fine grainstones and mudstones.
has thickness description: To 18m
has upper boundary definition: The top is a sharp erosion surface overlain by the basal, coarse grainstone (Craig-y-Gaer Coral Bed) of the overlying Gilwern Oolite Formation.

Corbar Grit
type: Concept
in scheme: NamedRockUnit
alternative label: COG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41150
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41151
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41152
has lithology component: COG MDST
has lithology component: COG SDST
has source info: COG_49236
has source info: COG_50168
has source info: COG_52074
has source info: COG_52767
has obsolete equivalent: COG ASG
broader: MG
has lower boundary definition: The base of the unit is poorly defined. In the field and on stratigraphic logs, the lower boundary is taken at the base of the first sandstone within a sandstone-dominated unit overlying a mudstone-dominated part of the Millstone Grit Group, overlying an unnamed sandstone within the latter; where this is absent the unit is the first sandstone-dominated unit above the mudstone-dominated part of the Millstone Grit Group overlying limestones of the Monsal Dale Limestone Formation.
has geographical distribution: Longclough (Cheshire) [SJ 987 737], Whitehills [SJ 973 728] (Cheshire); Edgemoor (Derbyshire) [SK 0343 7345].
has lithology description: Sandstone, fine-grained, flaggy, feldspathic, with subordinate mudstone, in up to 4 turbiditic cycles.
has thickness description: 200m
has upper boundary definition: The upper boundary is taken at the base of a mudstone-dominated succession of the Millstone Grit Group above sandstones of the Corbar Grit.

Carse Of Gowrie Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: COGCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41153
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41154
has lithology component: COGCL C
has lithology component: COGCL P
has lithology component: COGCL S
has lithology component: COGCL Z
has source info: COGCL_51034
has source info: COGCL_52781
has obsolete equivalent: COGCL mn 809
broader: Carse Clay Formation
has lower boundary definition: Unconformable, on the sub-Carse Peat (Flanders Moss Peat Formation) and older Holocene and late Devensian units including the Carey Silt Member.
has geographical distribution: Lower Tay valley from northwest of Perth, the Tay estuary and Firth of Tay, the lower Earn valley, east of Forteviot, and estuary, the lower Eden valley, east of Cupar, and estuary, the Montrose basin area.
has lithology description: Clayey silt and clay, commonly rooty and structureless; highly laminated with silt and very fine- to medium-, locally coarse-grained sand with pebbles up to 5mm and fragments of vivianite; grey and brownish grey, finely micaceous with sporadic dark sulphidic patches.
has thickness description: Veneer to 10m
has upper boundary definition: Upper boundary (unconformable?) with transgressing Gowrie Silt Member (Carse Clay Formation) and commonly at the surface.

Crousa Gravels
type: Concept
in scheme: NamedRockUnit
alternative label: COGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/!
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: NO
has predominant age: NO
has youngest age: NO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41155
has lithology component: COGR GRAV
has lithology component: COGR SICL
has lithology component: COGR SISND
has source info: COGR_49073
has source info: COGR_50213
has source info: COGR_50503
has source info: COGR_50505
has source info: COGR_52521
has obsolete equivalent: COGR mn 1165
broader: NA
has additional age information: Pliocene (probable).
has lower boundary definition: An unconformable contact with the underlying gabbro of the Lizard Series, which here is weathered and covered with rounded boulders of less weathered gabbro. Gravel of white and dark grey quartz pebbles, with tourmalinite and granite in the lowest part of the Crousa Gravels are stratified, and contain discontinuous layers of sand and clay.
has geographical distribution: The Lizard Peninsula, Cornwall.
has lithology description: Comprises rounded pebbles of white quartz, 2.5 to 15cm in diameter, uncommon dark grey or blue quartz-tourmaline rock and rare granite, which is very weathered. Near the base of the deposit, the gravel is stratified and contains thin interrupted intercalations of yellow sand and white clay. Towards the top of the deposit, the gravels are disturbed and bedding planes are commonly curved, probably as a result of freeze-thaw action.
has thickness description: To 6.1m
has upper boundary definition: The present day erosion surface landscape is locally covered by thin Head deposits. Vegetation growing on the Crousa Gravels is typically a scanty growth of heather and thorn.

Coull Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COGT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: COGT PSAMM
has lithology component: COGT SEMPEL
has source info: COGT_49443
broader: Colonsay Group

Codden Hill Chert Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41156
has lithology component: COH CHRT
has lithology component: COH LMST
has lithology component: COH MDST
has lithology component: COH SMDST
has lithology component: COH TUF
has source info: COH_49643
has source info: COH_50847
has source info: COH_51015
has source info: COH_51484
has source info: COH_52501
has obsolete equivalent: COH st 182
has obsolete equivalent: COH mn 998
has obsolete equivalent: COH mn 999
has obsolete equivalent: COH mn 2810
has obsolete equivalent: COH mn 2955
has obsolete equivalent: COH mn 715
has obsolete equivalent: COH mn 1000
has obsolete equivalent: COH mn 1563
has obsolete equivalent: COH mn 4118
broader: TEVY
narrower: Fremington Member
has additional age information: Note: the Age Range shown (Arundian to Brigantian) derives from an earlier Partial Lexicon entry. A generalized age of "Dinantian" may be more appropriate and realistic, pending acquisition of more specific evidence.
has lower boundary definition: The lower boundary is taken at the incoming of thin-bedded dark grey siliceous mudstones and shaly mudstones of the Codden Hill Chert Formation above the dark grey slightly siliceous mudstones of the Doddiscombe Formation (Unit D of the Pilton Beds of Prentice 1960). The Doddiscombe Formation has not been mapped on Sheet 293 (Barnstaple by Edmonds et al (1985), being included in the Pilton Mudstone Formation and/or Codden Hill Chert Formation. Further investigation is needed.
has geographical distribution: Between Fremington and South Molton, north Devon (SS 70 28).
has lithology description: Lower half (Tawstock Formation of Jackson, 1991) comprises thin- to medium-bedded pale and dark grey siliceous mudstones, shaly mudstones and cherts. Upper half (Hearson and Rubble Hills formations of Jackson, 1991) comprises thin- to medium-bedded limestones, turbidites and mudstones with streaky laminated cherts in the uppermost part. Two thin tuffs are present and Pectinoid bivalves are common in the upper half. Facies variations mapped on Sheet 293 (Barnstaple) by Edmonds et al (1985) have been shown by Jackson (1991) to be illusory and due to faulting resulting in stratigraphic omissions. Similarly a facies recognised by Prentice (1960) in the Fremington area and dominated by limestones and mudstones has been shown by Jackson (1991) to be the upper half of the Formation with the lower half thrust out.
has thickness description: 190m
has upper boundary definition: West of South Molton, the upper boundary is taken at the incoming of dark grey to black pyritic mudstones within thin siltstones of the overlying Dowhills Mudstone Formation above the streaky laminated cherts and mudstones of the Codden Hill Chert Formation. The boundary is taken at the top of the highest chert bed. The Dowhills Mudstone Formation (Limekiln Beds of Prentice, 1960), was included in the Crackington Formation by Edmonds et al. (1985) on Sheet 293 (Barnstaple). Further investigation is needed.

Collingham Head
type: Concept
in scheme: NamedRockUnit
alternative label: COHD
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: COHD DMTN
broader: NE
has geographical distribution: Found dominantly on the south (north-facing) side of the lower Wharfe valley (Yorkshire), but also occurs more patchily along the northern valley side and in tributary valleys. The deposit forms a recognisable solifluction "terrace" between essentially superfical deposit-free ground above and flat-topped erosional benches in the valley below.
has lithology description: Mainly comprises soliflucted glacial material, dominantly till (diamicton), locally incorporating blocks and smaller fragments of near-source bedrock material.

Coilacreich Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: COIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: COIL GN
broader: Cairngorm Granitic Suite

Cokeyard Coal (Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: COK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COK COAL
broader: ULGS

Cockshead Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: COKC
has current status: CURRENT
has theme: BEDRCK
notation: Co
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: COKC COAL
broader: PLCM

Coke Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: COKE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: COKE COAL
broader: Downend Member

Colla Firth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COLA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: COLA GNGNS
has lithology component: COLA PEL
has lithology component: COLA PSAMM
has lithology component: COLA PSGNF
has lithology component: COLA PSMGN
has lithology component: COLA QZITE
has lithology component: COLA SEMPEL
has lithology component: COLA SPELGN
has obsolete equivalent: COLA mn 1007
broader: Whiteness 'Division'
narrower: WEIL
narrower: WNSL

Coldingham Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COLB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: COLB
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41158
has lithology component: COLB CASLST
has lithology component: COLB WACKE
has source info: COLB_48966
has source info: COLB_50487
has source info: COLB_51394
has obsolete equivalent: COLB mn 1002
broader: NP
has additional age information: Llandovery to Wenlock?
has lower boundary definition: Faulted.
has geographical distribution: Coldingham area, Berwickshire, southeast Scotland.
has lithology description: Thinly-bedded greywacke sandstone, shale and calcareous siltstone.
has thickness description: c.200m
has upper boundary definition: Faulted.

Colinswell Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: COLM
has current status: CURRENT
has theme: BEDRCK
notation: Colm
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41159
has lithology component: COLM MDST
broader: NE
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Mudstone.
has thickness description: 5.79 metres. (Top 230.35 metres, bottom 236.14 metres).
has upper boundary definition: Conformable.

Collieston Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COLN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: COLN CALSIR
has lithology component: COLN GNSS
has lithology component: COLN MLMST
has lithology component: COLN PEL
has lithology component: COLN PSAMM
has lithology component: COLN SEMPEL
has source info: COLN_53026
broader: SOHI

Colpatie Coal
type: Concept
in scheme: NamedRockUnit
alternative label: COLP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COLP COAL
broader: NE

Cornet Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: COLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: COLS LMST
broader: TYLS

Coll-Tiree Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: COLTI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AL
has predominant age: AL
has youngest age: AL
has lithology component: COLTI CAMPTN
has lithology component: COLTI LMPY
has lithology component: COLTI MONCHQ
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/L

Colluvium
type: Concept
in scheme: NamedRockUnit
alternative label: COLV
has current status: CURRENT
has theme: MASMVT
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
broader: MASMD

Corry Member
type: Concept
in scheme: NamedRockUnit
alternative label: COM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: COM LMST
has lithology component: COM MDST
broader: Bellavally Formation

Coatbridge Musselband
type: Concept
in scheme: NamedRockUnit
alternative label: COMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Coatbridge Musselband Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: COMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: COMC COAL
broader: MCMS

Coal Measures Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: COME
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
broader: NE
narrower: SWCM
narrower: PCM
narrower: Scottish Coal Measures Group

Coatbridge Musselband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: COMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: COMI SHFEST
broader: MCMS

Commodore Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KE
has source info: COMM_51880
broader: Cromer Knoll Group

Conwy Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CyM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has lithology component: COMU MDST
has lithology component: COMU SDST
has lithology component: COMU SLST
has lateral equivalent: COMU st 388
has obsolete equivalent: COMU mn 510
has obsolete equivalent: COMU mn 1234
has obsolete equivalent: COMU mn 511
has obsolete equivalent: COMU mn 1879
broader: NP
narrower: GYS
narrower: Conwy Castle Grit Member
has lithology description: Grey mudstones and siltstones with thin, flaggy, cross-bedded and ripple marked sandstones.

Early Cambrian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: COMY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has obsolete equivalent: COMY mn 1018
broader: NE

Connswater Marl Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CONN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Conwy Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CONWY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41160
has lithology component: CONWY C
has lithology component: CONWY P
has lithology component: CONWY S
has lithology component: CONWY V
has lithology component: CONWY Z
has source info: CONWY_50923
has source info: CONWY_52509
has obsolete equivalent: CONWY ALV
has obsolete equivalent: CONWY LDE
has obsolete equivalent: CONWY ALF
has obsolete equivalent: CONWY HEAD
has obsolete equivalent: CONWY RTD
broader: Cheshire - North Wales Catchments Subgroup
has lower boundary definition: Sharp, unconformable and locally channelised, predominantly on bedrock and Late Devensian head and Welsh glacigenic deposits (e.g. Eryri Till Formation). Interdigitates in a complex manner with Tidal Flat Deposits (Gwynllwg Formation of Bowen, 1999) in the estuary.
has geographical distribution: The valley of the River Conwy and its tributaries (Gwynedd and Clwyd), northern Wales.
has lithology description: Unconsolidated, stratified gravels, sands, silts and clays forming the alluvial deposits of the Afon Conwy (River Conway) and its tributaries. Includes contemporaneous head, colluvium and pedogenic deposits within the catchment area. Clasts principally consist of local Lower Palaeozoic turbidites admixed with Ordovician volcanic rock clasts derived from Snowdonia and the Harlech Dome (either primarily, or secondarily from the reworking of glacigenic deposits). Aggradational riverr terraces and major alluvial fans are dominated by pebble cobble gravels and medium- to coarse-grained sand, and locally by silty clay with pebble and cobble beds (Warren et al, 1984), the modern floodplain is dominated by silt and clay, and locally includes lenses of peat.
has thickness description: Generally to around 10m, with up to 2m exposed locally (Warren et al. 1984).
has upper boundary definition: Generally the present ground surface or, locally, overlain by peat.

Coralline Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has lithology component: COO LMST
broader: Corallian Group
narrower: MTOL
narrower: MOCR
narrower: Hambleton Oolite Member
narrower: YED
narrower: Coral Rag Member (Cleveland Basin)
narrower: MCG
narrower: Birdsall Calcareous Grit Member

Cooldaragh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COOH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: COOH MDST
broader: NE

Cook Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COOK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
broader: Dunlin Group

Coolbeg Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COOL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Cairns Of Ord Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: COORD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: COORD MCGN
broader: NE

Coal Pit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COP
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: COP CLAY
has lithology component: COP CLSH
has lithology component: COP SANDU
has source info: COP_52786
has obsolete equivalent: COP mn 2675
broader: NE
has lower boundary definition: Basal erosion surface dissects Fisher, Ling Bank and Aberdeen Ground Formations.
has geographical distribution: Not defined.
has lithology description: Sandy silty clay and interlaminated clay and fine-grained silty sand; clay generally stiff and overconsolidated with some pebbles. Shell fragments and complete valves abundant in places.
has thickness description: 76 metres in erosive feature; lateral variations between 0-180 metres.
has upper boundary definition: Eroded at top by pre-Forth Formation erosive phases.

Corinacy Pelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: COPE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41162
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41161
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41163
has lithology component: COPE METR
has lithology component: COPE MLMST
has lithology component: COPE PEL
has lithology component: COPE PELGP
has lithology component: COPE PSAMG
has lithology component: COPE UMR
has source info: COPE_49798
broader: Blackwater Formation
has lower boundary definition: Top of thick persistent unit of greywacke grit at the top of interbedded grits and metavolcanic rocks characteristic of the lower part of the Blackwater Formation.
has geographical distribution: SE flank of River Deveron Valley between Hill of Bank [NJ 3829] and Succoth [NJ 43 35] Cabrach area, Moray District, 1:50 000 sheets 75E (just), 85E and 86W.
has lithology description: Pelites, dark-grey, graphitic in parts, commonly andalusite-bearing, phyllitic to slaty. Bands of metabasalt and ultramafic rock, particularly in lower part.
has thickness description: 900m (based on outcrop width of 1km, with no allowance for probable folding).
has upper boundary definition: Base of overlying thick quartzite (the Grumack Hill Quartzite Member).

Coralea Phyllite Member
type: Concept
in scheme: NamedRockUnit
alternative label: COPH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41164
has lithology component: COPH LMST
has lithology component: COPH SEMPEL
has source info: COPH_49233
has source info: COPH_49798
broader: Culchavie Striped Formation
has lower boundary definition: Limit of quartzites at top of Kymah Quartzite Formation.
has geographical distribution: 250 - 500m wide outcrop extending N-S from around Allt na Craoibhe - Caorainn [NJ 31 25] to Water of Nochty [NJ 305 162]. Also in synclinal core around Steplar Road [NJ 30 26], Moray District 1:50 000 Sheet 75E.
has lithology description: Phyllitic semipelites, grey-green, laminated to striped with minor limestone beds.
has thickness description: c. 300m (based on outcrop width with no allowance for probable folding).
has upper boundary definition: Base of pebbly quartzites of the Caochandye Quartzite Member.

Coplow Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41165
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41167
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41168
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41166
has lithology component: COPL LMST
has lithology component: COPL MDST
has source info: COPL_49284
has source info: COPL_49848
has source info: COPL_50767
has source info: COPL_51255
has source info: COPL_52900
has obsolete equivalent: COPL mn 1040
broader: Clitheroe Limestone Formation
has lower boundary definition: Taken at the base of the lowest Waulsortian limestone, which rests conformably upon fissile mudstones of the "Lower Coplow Shales".
has geographical distribution: The Craven Basin, generally to the south and west of the Bowland High, within the Ashnott and Clitheroe anticlines [SD 74], Slaidburn and Newton [SD 75], Thornley [SD 64] and Whitwell [SD 64] anticlines.
has lithology description: Pure, massive and biohermal Waulsortian limestones with surbordinate packstones, grainstones and thin fissile mudstones.
has thickness description: Up to 300 m thick.
has upper boundary definition: Generally, Waulsortian limestones of the Coplow Limestone Member are overlaain unconformably by mudstones of the Hodder Mudstone Formation. In the Clitheroe Anticline the upper part of the Coplow Limestone Member is present, with Waulsortian limestones overlain conformably by poorly exposed dark grey fissile mudstones and packstones of the 'Upper Coplow Shales'.

Corrydon Psammite Member
type: Concept
in scheme: NamedRockUnit
alternative label: COPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41169
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41170
has lithology component: COPS PSAMM
has lithology component: COPS QZITE
has lithology component: COPS SEMPEL
has source info: COPS_51786
has obsolete equivalent: COPS mn 3203
broader: Ben Lui Schist Formation
has lower boundary definition: Between Meall Odhar [NO 11 65] and the western margin of the Glen Shee Pluton: Top of attenuated Farragon Volcanic Formation. Between north-east contact of Glen Shee Pluton and head of Glen Isla [NO 17 71]: Top of Ben Lawers Schist Formation.
has geographical distribution: Meall Odhar area [NO 11 65] to the head of Glen Isla [NO 17 71].
has lithology description: Schistose psammite and semipelite, fine-grained and quartzite.
has thickness description: Not known
has upper boundary definition: In the west: Gradational passage into dominantly gneissose semipelite of the Duchray Hill Gneiss Member. In the east: top of white fine-grained quartzite below gneissose semipelites of the Duchray Hill Gneiss Member.

Corryhabbie Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41171
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41172
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41173
has lithology component: COQU PSAMM
has lithology component: COQU QAREN
has lithology component: COQU QZF
has source info: COQU_49233
broader: Ballachulish Subgroup
has lower boundary definition: At lower limit of persistent pasmmite or quartzite above the Mortlach Graphitic Schist Formation.
has geographical distribution: Loch Builg, Inchrory and Carn Mor, upper Strath Don northwards via Glen Avon, Glen Livet. Glen Fiddich to the Balloch Hills near Keith. Small outcrops farther north around Windyhills. 1:50 000 Sheets 75W, 75E, 85E, 86W, 96 (just).
has lithology description: Orthoquartzite, fawn to white; cross-bedded with pinkish haematite streaks. Thin micaceous interbeds common. Gritty in parts. Flaggy, micaceous psammites locally at top and base.
has thickness description: Generally 80-300m. Wider outcrops may be due to folding.
has upper boundary definition: At upper limit of persistent psammite or quartzite below phyllites and calcareous schists of the Ailnack Phyllite and Limestone Formation or the Cock Burn Calcareous Schist Formation.

Conwy Rhyolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41174
has lithology component: COR MDST
has lithology component: COR RY
has lithology component: COR SDST
has lithology component: COR TUF
has lithology component: COR VCBR
has source info: COR_49974
has source info: COR_50521
has source info: COR_52199
has obsolete equivalent: COR mn 1039
broader: LLV
has lower boundary definition: Overlies mudstones of the Nant Ffrancon Subgroup. Interdigitates with the Foel Fras Volcanic Complex.
has geographical distribution: Conwy Mountain (2km west-north-west of Conwy) to around Foel Fras (8km west-north-west of Dolgarrog).
has lithology description: Rhyolite lavas and inter-flow breccias, tuffs and intercalated sedimentary rocks.
has thickness description: To c.1000m, thins southwards.
has upper boundary definition: Underlies mudstones of the Nant Ffrancon Subgroup. Interdigitates with the Foel Fras Volcanic Complex.

Coral Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CORA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CORA AROC
has lithology component: CORA LMST
is obsolete equivalent of: CORA CYGC
broader: Cefn Mawr Limestone Formation

Corbiehall Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CORB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CORB COAL
broader: NE

Corbie Craig Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: CORC
has current status: CURRENT
has theme: BEDRCK
notation: CORC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CORC COAL
broader: LSC
has geographical distribution: Specifically the Peebles/Biggar area.

Carnmore Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CORE
has current status: CURRENT
has theme: BEDRCK
notation: CORE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41175
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41176
has lithology component: CORE PESST
has lithology component: CORE SDST
has source info: CORE_52286
broader: MEF
has lower boundary definition: Not seen, everywhere concealed. Occurs within Meenymore Formation and thus reverts to mixed argillaceous-arenaceous sequence typical of the formation.
has geographical distribution: Slieve Beagh (Lisneshea) area of south Co. Fermanagh, Northern Ireland.
has lithology description: Sandstone, pale grey to fawn, medium- to very coarse-grained, pebble bands, litharenite, dolomite-cemented locally.
has thickness description: About 75m
has upper boundary definition: Not seen, everywhere concealed.

Corgarff Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CORG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41177
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41178
has lithology component: CORG CHRT
has lithology component: CORG LMST
has source info: CORG_49233
broader: TDSL
has lower boundary definition: Lower limit of crystalline limestone within pelites and semipelites of Tornahaish Dark Schist and Limestone Formation.
has geographical distribution: On Upper Donside, mainly near Corgarff and Corgarff Castle. Intermittent outcrops extend southeast from Tornahaish to Mammie Hill: also north of Delnadamph.
has lithology description: Limestone, bluish-grey, crystalline, commonly thinly banded, with chert lenses. Blocky to flaggy, rarely massive. Tight to isoclinal internal folding common in parts.
has thickness description: 12 - 20m. Typically 15m, may be thinner and impure by Allargue House.
has upper boundary definition: Upper limit of crystalline limestone within Tornahaish Dark Schist and Limestone Formation. Schistose calcareous semipelite above. Thence non-calcareous semipelite.

Corby Hall Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CORH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: CORH MGB
broader: HOMI

Corkerhill Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CORK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41179
broader: NE
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Blaes; CBI 5"; Blaes 3' 0"; CBI 9"; Blaes.
has thickness description: 13".
has upper boundary definition: Conformable.

Corbridge Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CORL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CORL LMST
has lateral equivalent: CORL st 22
has lateral equivalent: CORL FSML
has lateral equivalent: CORL LFTL
has lateral equivalent: CORL SUS
broader: SMGP

Cormorant Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CORM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/J
broader: Heron Group [Offshore]
narrower: Harris Member
narrower: LEWI
narrower: LUND
narrower: LOMV
narrower: TEIS

Corrennie Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CORN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NEGRA

Cork Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CORO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
broader: NE

Corral Coal (Dailly)
type: Concept
in scheme: NamedRockUnit
alternative label: CORR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CORR COAL
broader: LSC

Corton Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CORS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: CORS DIAMIT
has lithology component: CORS GRAV
has lithology component: CORS SANDU
has obsolete equivalent: CORS mn 1069
broader: NE
has lithology description: Dominated by sand; with interbedded clay (till) and some gravel in the lower part. [Generic description: from East Anglian data].

Corse Diamicton Member
type: Concept
in scheme: NamedRockUnit
alternative label: CORSE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41181
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41180
has lithology component: CORSE DMTN
has lithology component: CORSE S
has source info: CORSE_49716
has source info: CORSE_50162
has source info: CORSE_50626
has source info: CORSE_50875
has source info: CORSE_50897
has source info: CORSE_51989
has source info: CORSE_52002
has source info: CORSE_52214
has source info: CORSE_52951
has obsolete equivalent: CORSE mn 1401
has obsolete equivalent: CORSE mn 4323
has obsolete equivalent: CORSE mn 1062
has obsolete equivalent: CORSE mn 1402
has obsolete equivalent: CORSE mn 1439
broader: WHGL
has additional age information: Devensian (??MIS 3 - 2).
has lower boundary definition: The lower boundary of the diamicton is complex due to its, in part, glaciotectonic emplacement. In some situations it rests with an unconformable, undulatory, sharp to gradational basal contact on brown diamicton of the Rottenhill Till Formation. (It might also include a leaf of the overlying Hythie Till Formation, e.g. northeast face, Leys Quarry (disused). In other situations (e.g. north face, Kirkhill Quarry) its basal boundary is seen as a sharp, planar, subhorizontal, erosion surface on red felsitic gravel of the Corsend Gelifluctate Bed.
has geographical distribution: Buchan, northeast Scotland. The member is only known within the immediate vicinity of Kirkhill quarry (infilled) (centred on NK 0120 5285) and Leys quarry (disused) (centred on NK 0040 5250) on Sheet 87W (Ellon). Buchan, northeast Scotland.
has lithology description: Pebbly, clayey, sandy silt diamicton. Typically black and dark grey, weakly calcareous, matrix-supported. The matrix contains a rich Mesozoic (principally Jurassic and Lower Cretaceous) palynoflora. Clasts are of pebble grade and typically subangular to rounded and composed of quartzitic and psammitic metasedimentary rocks, with sparse felsite, chalk and shell fragments. Deformed and attenuated beds and rafts of pinkish yellow fine-grained, slightly pebbly, sand are locally common. Interpreted as having been initially deposited as subglacial till but subsequently, at least in part, glaciotectonically deformed and rafted into position during a subsequent glacial event.
has thickness description: To 4.7m
has upper boundary definition: The upper boundary of the diamicton is also complex. In some situations (e.g. northeast face, Leys Quarry (disused) it displays a sharp to gradational, interdigitating (glaciotectonic) upper and lateral contact with brown diamicton of the Hythie Till Formation within which it occurs as attenuated masses and rafts. Where overlying diamicton of the Hythie Till Formation is locally absent the Corse Diamicton Formation occurs at the present ground surface. In other situations (e.g. north face, Kirkhill Quarry (infilled) the diamicton's upper boundary is a sharp, erosional, channelised surface and it is overlain by the Kirkhill Church Sand Member. (Blackhills Sand and Gravel Formation).

Corvanaghan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CORV
has current status: CURRENT
has theme: BEDRCK
notation: CORV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41182
has lithology component: CORV GNSS
has lithology component: CORV PEL
has lithology component: CORV SCH
has source info: CORV_48647
has obsolete equivalent: CORV CORV
has obsolete equivalent: CORV mn 4293
has obsolete equivalent: CORV mn 4290
is obsolete equivalent of: CORV CORV
broader: NE
has lower boundary definition: Not seen due to faulting.
has geographical distribution: Central County Tyrone, Northern Ireland. Corvanaghan, Fir Mountain, Beleevenamore, Evishanoran.
has lithology description: Predominantly quartz feldspar biotite granular gneiss with subordinate mica schist and pelite. Metamorphosed up to sillimanite grade.
has thickness description: Unknown.
has upper boundary definition: Not seen due to faulting.

Cornbrook Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41183
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41184
has lithology component: COS SDST
has source info: COS_50039
has source info: COS_51727
has source info: COS_52369
has source info: COS_52515
has source info: COS_52785
has source info: COS_52950
has obsolete equivalent: COS mn 2901
has obsolete equivalent: COS mn 1057
broader: NP
has lower boundary definition: The pebbly sandstones of the Cornbrook Sandstone Formation are considered to rest unconformably upon limestones of the Oreton Limestone Formation at the type locality of Cornbrook Dingle, although the exposed contact is faulted, and upon the Devonian St Maughans Formation (Lower Old Red Sandstone Group at the reference section in Benson's Brook.
has geographical distribution: The Clee Hills area of Shropshire [SO 60 75].
has lithology description: Comprises conglomerate and pebbly quartzitic sandstones, coarse- to fine-grained. The sandstones are orange or brown, locally stained red, and thick-bedded. Thin mudstone beds, bluish grey or green. locally red, with seatearths and thin coals. The base of the formation comprises of a massive conglomerate with clasts up to 25 cms in diameter of quartz and quartzite, and subordinate slate, with sandstone from the Old Red Sandstone Group, and Dinantian limestone.
has thickness description: From 55m to 215m
has upper boundary definition: At Benson's Brook, the boundary has been considered to occur where thick seatearths and sandstones of the Pennine Coal Measures Group rest unconformably upon thick sandstones and conglomerates of the Cornbrook Sandstone Formation (Dixon, 1917). In contrast, the boundary has been argued to be faulted at this locality (Jones and Owen, 1961).

Coracle Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KB
broader: WISA

Carse Of Stirling Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: COSCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41186
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41185
has lithology component: COSCL C
has lithology component: COSCL P
has lithology component: COSCL S
has lithology component: COSCL Z
has source info: COSCL_49343
has source info: COSCL_49744
has source info: COSCL_52314
has obsolete equivalent: COSCL mn 809
broader: Carse Clay Formation
has additional age information: Mid Holocene.
has lower boundary definition: Unconformable, on the sub-Carse Peat (Flanders Moss Peat Formation) and older Holocene and late Devensian units including the Letham Silt Member.
has geographical distribution: Upper Forth valley from Aberfoyle eastwards to near the Forth estuary in the Falkirk area; area of the estuarine deposits of the Main Post-Glacial Shoreline and associated raised beach surfaces.
has lithology description: Clayey silt and clay, commonly rooty and structureless; highly laminated with silt and very fine- to medium-, locally coarse-grained sand; grey, black and brownish grey, finely micaceous, dark sulphidic patches, shells and shell fragments, vivianite grains. These are deposits of an estuarine tidal flat complex formed just before and during highest Holocene sea-level (Main Post-Glacial Shoreline).
has thickness description: Veneer to perhaps as much as 15m
has upper boundary definition: Upper boundary partly unconformable with transgressing Claret Clay Member (Carse Clay Formation) and unconformably overlain by surface peats; commonly at surface partly because of peat clearances from the 18th century onwards. It also passes laterally into the peat bodies of East and West Flanders Mosses.

Coupland Sike Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoSL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41187
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41188
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41189
has lithology component: COSL ARLMST
has lithology component: COSL CHRT
has lithology component: COSL DOLO
has lithology component: COSL LMST
has lithology component: COSL MDST
has lithology component: COSL SLST
has source info: COSL_50729
broader: SCBL
has lower boundary definition: At the base of limestone, overlying a 5m unit of interbedded sandstone and mudstone, which forms a topographic depression at the top of the underlying Park Hill Limestone Member. The junction is nowhere exposed now, but the interbedded unit was formerly seen in a road cutting at [NY 7248 0448] during the construction of the Ravenstonedale By-pass, and the junction was recorded in M6 Site Investigation Boreholes at [NY 5885 0998]
has geographical distribution: Ravenstonedale, Cumbria between the M6 and the Dent Fault zone, south of Kirkby Stephen.
has lithology description: Packstone, dark grey, well bedded, blocky, partly dolomitized and bituminous, with the common occurrence of the coral Dorlodotia. Cyclically interbedded with thin mudstone and siltstone beds. The limestone beds are a fairly constant 0.75m thick.
has supplementary information: The above data replaces existing Partial entry.
has thickness description: 40 to 50m
has upper boundary definition: Taken at the base of the overlying Brownber Formation, where there is a change from dark grey cyclically bedded limestone to pale grey ooidal limestone and calcarenite.

Coa Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Cocklett Scar Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: COSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoSS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41190
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41191
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41192
has lithology component: COSS SDST
has lithology component: COSS SLST
has source info: COSS_48721
has source info: COSS_51026
has source info: COSS_52911
has obsolete equivalent: COSS mn 996
has obsolete equivalent: COSS mn 4016
has obsolete equivalent: COSS mn 995
broader: RBL
has lower boundary definition: Rapidly gradational at incoming of persistent sandstones interbedded with siltstones above shaly mudstones with siderite mudstones above the Eumorphoceras ferrimontanum Marine Band.
has geographical distribution: Lancaster Fells (Lancaster 1:50 000 sheet).
has lithology description: Interbedded fine- to medium-grained, thin to thick-bedded sandstones and grey micaceous shaly siltstones.
has thickness description: 60 - c.100m.
has upper boundary definition: Rapidly gradational at top of persistent sandstones interbedded with siltstones below calcareous siltstones with very few sandstone beds of the Close Hill Siltstone.

Colonsay Group
type: Concept
in scheme: NamedRockUnit
alternative label: COSY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: COSY PEL
has lithology component: COSY SEMPEL
broader: NE
narrower: SAGW
narrower: SAPH
narrower: Eilean Liath Grit Formation
narrower: MIA
narrower: SMGW
narrower: ORGW
narrower: KCH
narrower: KIPH
narrower: KITH
narrower: KLFL
narrower: KNPH
narrower: Coull Grit Formation
narrower: OCSA
narrower: SGP
narrower: MCHA
narrower: Ardnave Phyllite And Greywacke Formation
narrower: RGGT
narrower: RKE
narrower: RNHM
narrower: Dun Gallain Grit Formation

Cotgrave Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cot
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: TC
has predominant age: TC
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41193
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41194
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41195
has lithology component: COT GYPST
has lithology component: COT MDST
has lithology component: COT SDST
has lithology component: COT SLST
has source info: COT_48671
has source info: COT_48797
has source info: COT_48817
has source info: COT_51674
has obsolete equivalent: COT mn 1078
has obsolete equivalent: COT mn 1080
has obsolete equivalent: COT mn 1077
has obsolete equivalent: COT mn 1079
broader: SIM
has lower boundary definition: Conformable, at the abrupt base of the lowest pale grey sandstone bed of the Cotgrave Sandstone Member where it overlies the red-brown mudstone of the underlying Gunthorpe Member.
has geographical distribution: Mappable at surface in south Nottinghamshire and Leicestershire; not traced north of Newark.
has lithology description: Sandstone, fine- to medium-grained dolomitic, pale greenish grey, interbedded with mudstone and siltstone, dark greenish-grey. Common gypsum nodules.
has supplementary information: Formerly considered a Member of the Edwalton Formation, which is now itself downgraded to Member status, the Cotgrave Sandstone Member is retained as a locally recognizable (and readily mappable) unit within the Sidmouth Mudstone Formation.
has thickness description: 1 to 5m (4.5m in Cropwell Bridge Borehole, SK63NE/28).
has upper boundary definition: Conformable, at the abrupt or rapid upward transition from interbedded green mudstone and pale grey fine-grained sandstone of the Cotgrave Sandstone Member to reddish brown structureless mudstone at the base of the Edwalton Member.

Comrie Three Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: COTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COTH COAL
broader: LSC

Corton Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: COTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has obsolete equivalent: COTI mn 3097
broader: HPGL

Comrie Two Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: COTN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: COTN COAL
broader: LSC

Cove Vein
type: Concept
in scheme: NamedRockUnit
alternative label: COV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41197
has source info: COV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Cottonshope Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CoVo
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41198
has lithology component: COVO BA
has lithology component: COVO BAOP
has lithology component: COVO BATHL
has source info: COVO_50248
has source info: COVO_50249
has source info: COVO_50536
has source info: COVO_51224
has obsolete equivalent: COVO mn 1085
has obsolete equivalent: COVO mn 1086
broader: INV
has lower boundary definition: Taken at the broadly conformable base of the lowest basalt sheet that sharply overlies a sequence of red and grey flaggy sandstones with ochreous brown spots, interbedded with purple, red lilac and green mudstone containing ochreous concretions, and thin concretionary carbonate (cornstone) beds (Lower Freestone Beds of Taylor et al, 1971), possibly part of the Kinnesswood Formation.
has geographical distribution: Southwest flanks of the Cheviot massif: exposed in Cottonshope Burn, Spithope Burn, Hungry Law, and between the Bareinghope Burn and the Chattlehope Burn, Northumberland.
has lithology description: Basalt, olivine-phyric, tholeiitic; several sheets of intensely fractured dark blue-grey rock, each passing up into highly amygdaloidal, scoriaceous and pillow-like tops, which contain infills of overlying sedimentary rock. Upper part of formation is intercalated with dark grey and greenish grey sandstone and argillaceous dolostone ("cementstone") of the overlying Ballagan Formation. Interpreted as lavas.
has thickness description: To 24m
has upper boundary definition: Taken at the base of overlying interbedded sandstone, mudstone and argillaceous dolostone sequence of the Ballagan Formation (formerly Cementstone Group); the upper contact is intercalated.

Cow Rock Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: COW
has current status: CURRENT
has theme: BEDRCK
notation: COW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41199
has lithology component: COW CONG
has lithology component: COW CSSST
has lithology component: COW WACKE
has source info: COW_50121
has source info: COW_52283
has source info: COW_52526
has source info: COW_52717
has source info: COW_52760
has obsolete equivalent: COW mn 3435
broader: SCA
has lower boundary definition: The basal member of the Scart Grits Formation, conformable on locally eroded shales of the underlying Woodland Formation.
has geographical distribution: The Girvan area of south-west Scotland.
has lithology description: Quartzitic micro-conglomerate, grit and sandstone.
has thickness description: From 14 to 24 m thick.
has upper boundary definition: Conformably overlain by the undivided part of the Scart Grits Formation.

Coylumbridge Formation
type: Concept
in scheme: NamedRockUnit
alternative label: COYB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: COL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41201
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41200
has lithology component: COYB CALSIR
has lithology component: COYB PSAMF
has lithology component: COYB PSAMI
has lithology component: COYB PSAMM
has lithology component: COYB QZITE
has lithology component: COYB SEMPEL
has source info: COYB_51802
broader: Corrieyairack Subgroup
has lower boundary definition: Conformable and transitional with Kincraig Formation but poorly exposed. Marked by change to dominantly psammite.
has geographical distribution: Northern Cairngorm Mountains and Mid-Speyside, Central Highlands of Scotland, sheets 74E and 64E.
has lithology description: Flaggy, laminated feldspathic psammite and micaceous psammite with minor bands of schistose semipelite; quartzite locally important.
has thickness description: 500m to 1km.
has upper boundary definition: Conformable transition up into more siliceous and feldspathic psammites of the Glen Spean Subgroup south of the Cairngorm Mountains.

Coyles Of Muick Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: COYM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: COYM MGB
has lithology component: COYM SEPITE
broader: NEBAS

Colsay Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: COYS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: Flett Formation

Cowleigh Park Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CPa
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41202
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41203
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41204
has lithology component: CPA CONG
has lithology component: CPA CSSST
has lithology component: CPA MDST
has lithology component: CPA SDST
has source info: CPA_48657
has source info: CPA_48738
has source info: CPA_51587
has source info: CPA_52610
has obsolete equivalent: CPA mn 1094
broader: MHS
has lower boundary definition: Unconformable on Proterozoic rocks or faulted boundary with Proterozoic or Cambrian rocks.
has geographical distribution: Cowleigh Park-Malvern district, Hereford and Worcester; also Eastnor area, southern Malverns (Ziegler and others, 1968).
has lithology description: Interbedded purple, brown, green and grey sandstones, grits and conglomerates and shales.
has thickness description: 300m - 450m
has upper boundary definition: Non sequence, overlain by Wyche Formation.

Chester Pebble Beds Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CPB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41205
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41206
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41207
has lithology component: CPB CONG
has lithology component: CPB PESST
has lithology component: CPB SDST
has lithology component: CPB SLST
has source info: CPB_48671
has source info: CPB_52268
has obsolete equivalent: CPB mn 684
broader: SSG
has lower boundary definition: Drawn at base of sequence dominated by sandstones containing pebbles and conglomerates; pebbles do not have a local derivation. Conformable on the Kinnerton Formation or unconformable on Palaeozoic rocks.
has geographical distribution: Cheshire Basin.
has lithology description: Sandstone, fine- to coarse-grained, commonly pebbly, with conglomerates and sporadic siltstones; cross-stratified.
has thickness description: <90m - >220m
has upper boundary definition: Transition at base of Wilmslow Sandstone Formation.

Coalpit Bay Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPBM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SA
has lithology component: CPBM MDST
broader: NE

Corsewall Point Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CPC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41208
has lithology component: CPC CONG
has lithology component: CPC SDST
has lithology component: CPC WACKE
has source info: CPC_50385
has source info: CPC_52489
has source info: CPC_52716
has obsolete equivalent: CPC mn 1028
has obsolete equivalent: CPC mn 1065
broader: Corsewall Formation
has lower boundary definition: Conformable/interfingers with wackes of Corsewall Formation.
has geographical distribution: Rhins of Galloway, south west Scotland.
has lithology description: Boulder, cobble and pebble conglomerate.
has thickness description: c.1000m
has upper boundary definition: Not seen (faulted).

Campsie Claybands
type: Concept
in scheme: NamedRockUnit
alternative label: CPCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CPCB FEST
broader: NE

Culver Chalk Formation And Portsdown Chalk Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CPCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: WHCK

Carboniferous-Permian Extensional Supersuite
type: Concept
in scheme: NamedRockUnit
alternative label: CPEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SS
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE
narrower: SCPA

Copster Green Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CPGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41210
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41209
has lithology component: CPGS PESST
has lithology component: CPGS SDST
has lithology component: CPGS SLST
has source info: CPGS_49848
has source info: CPGS_50171
broader: PG
has lower boundary definition: The base of a prominent, feature-forming sandstone unit approximately 180 m above the base of the sandstones of the Pendle Grit Member.
has geographical distribution: The Copster Green area [SD63], and the extreme south-eastern part of Garstang 50k sheet.
has lithology description: A coarse-grained, and pebbly, feldspathic sandstone, thickly-bedded, wavy-bedded, planar cross-bedded or massive, reddened, with subordinate beds of siltstone. Pebbles of quartz and mudstone are noted.
has thickness description: 135 m thick at Dinckley [SD 6884 3564], and 100 m thick at Clayton-le-Dale [SD 6726 3322].
has upper boundary definition: The base of a sandstone-dominated unit of the Pendle Grit Member above the highest prominent pebbly sandstone unit within a pebbly-sandstone dominated sequence of the Copster Green Sandstone.

Camphill Limestones
type: Concept
in scheme: NamedRockUnit
alternative label: CPHL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has source info: CPHL_49196
has source info: CPHL_51867
broader: TYLS
has geographical distribution: Northumberland; type area around Gunnerton.
has lithology description: Three limestones separated by clastic beds.
has thickness description: Total grouping is about 25m thick.

Cockley Pike Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPK
has current status: CURRENT
has theme: BEDRCK
notation: CPk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41211
has lithology component: CPK VCBR
has lithology component: CPK VCSST
has source info: CPK_50725
has source info: CPK_51575
has obsolete equivalent: CPK mn 997
broader: SET
has lower boundary definition: Taken at the mostly very abrupt change from siltstone and very fine-grained sandstone of the Bowfell Links Member to massive very coarse-grained sandstone. Locally there is some interdigitation between the two members.
has geographical distribution: From Thirlmere to Scafell and Langdale, Lake District, Cumbria
has lithology description: Massive to weakly stratified, coarse- to very coarse-grained volcaniclastic sandstone and breccia
has thickness description: Up to 250m
has upper boundary definition: Defined by the base of the overlying volcaniclastic rocks of the Sprinkling Tarn Member

Chonetes Polita Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CPL LMST
has lithology component: CPL SALMST
has lithology component: CPL SHYLST
broader: Cromhall Sandstone Formation
has geographical distribution: The Wick (Carboniferous) inlier, Gloucestershire.
has lithology description: Reddish, "gritty", shelly, crinoidal limestone.
has thickness description: c.10m

Copney Pillow-Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPLF
has current status: CURRENT
has theme: BEDRCK
notation: CPL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41212
has lithology component: CPLF BA
has lithology component: CPLF BAANDT
has lithology component: CPLF LAVA
has source info: CPLF_48647
broader: TVG
has lower boundary definition: Boundary not exposed.
has geographical distribution: Copney and Creggan rocks - mid County Tyrone, Northern Ireland.
has lithology description: Fine-grained dark-grey to black vesicular lavas (basalt - basaltic andesite) with locally well developed pillow structure.
has thickness description: Estimated 500m
has upper boundary definition: Boundary not exposed.

Celtic Palaeogene Minor Intrusion Suite
type: Concept
in scheme: NamedRockUnit
alternative label: CPMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Atlantean Supersuite

Carn Powell Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPOW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: MYMY

Clap Round Facies Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPR
has current status: CURRENT
has theme: BEDRCK
notation: CpR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41214
has lithology component: CPR MDST
has lithology component: CPR SDST
has source info: CPR_51079
has source info: CPR_52888
has obsolete equivalent: CPR mn 2927
broader: CNG
has lower boundary definition: No definition.
has geographical distribution: Central Wales.
has lithology description: Interbedded thin turbidite sandstones and turbidite mudstones with burrowed hemipelagites.
has thickness description: No definition.
has upper boundary definition: No definition.

Crossopodia Shales
type: Concept
in scheme: NamedRockUnit
alternative label: CPS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Captain Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KA
broader: WISA

Carperstane Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CPSTN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: CPSTN TR
broader: MVFEL

Cam Spout Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: CPT
has current status: CURRENT
has theme: BEDRCK
notation: CpT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41215
has lithology component: CPT FTUFF
has lithology component: CPT LPTUF
has source info: CPT_50725
has source info: CPT_52441
has obsolete equivalent: CPT mn 761
broader: LTT
has lower boundary definition: Taken at the base of bedded silicic tuff overlying eutaxitic lapilli-tuff of the Long Top Tuff Member, and lying between 25 and 75m above the base of the member or 5 to 15m above the top of the Oxendale Tuff where that is present
has geographical distribution: Cumbria,Thirlmere to Scafell and Langdale in the central Lake District
has lithology description: Cream and brown-weathered, bedded, fine-grained tuff with accretionary lappili that forms a widespread distinctive marker unit.
has thickness description: Up to 6m, but is typically less than 1m
has upper boundary definition: Defined by the overlying eutaxitic lapilli-tuff of the main part of the Long Top Tuff Member

Curran Point Halite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPTH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: WBMU

Carboniferous And Permian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CPU
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NP

Clyde Plateau Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CPV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41216
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41217
has lithology component: CPV AGG
has lithology component: CPV ANDR
has lithology component: CPV AROC
has lithology component: CPV BA
has lithology component: CPV BAMCP
has lithology component: CPV BAOCM
has lithology component: CPV BAOM
has lithology component: CPV BAPOCM
has lithology component: CPV BAROCM
has lithology component: CPV BARPM
has lithology component: CPV BARPMA
has lithology component: CPV HAW
has lithology component: CPV LAVA
has lithology component: CPV LMSTN
has lithology component: CPV MUG
has lithology component: CPV OLBA
has lithology component: CPV PYRR
has lithology component: CPV RY
has lithology component: CPV SAPEL
has lithology component: CPV SDST
has lithology component: CPV TR
has lithology component: CPV TRAND
has lithology component: CPV TRBA
has lithology component: CPV TRR
has lithology component: CPV TUF
has lithology component: CPV VCSLST
has lithology component: CPV VLSS
has source info: CPV_49986
has source info: CPV_52764
has obsolete equivalent: CPV mn 973
has obsolete equivalent: CPV mn 974
has obsolete equivalent: CPV mn 975
broader: SYG
narrower: Eaglesham Lava Member
narrower: Dumdruff Hill Lava Member
narrower: Darvel Lava Member
narrower: MMLA
narrower: HWLA
narrower: UFMLA
narrower: LFMLA
narrower: LHY
narrower: NNLA
narrower: Gowk Stane Member
narrower: GPVD
narrower: Glenburn Volcaniclastic Member
narrower: Greenan Castle Pyroclastic Member
has lower boundary definition: Base is taken at the lithological change from lavas, tuffs or volcaniclastic sediments into underlying clastic sedimentary rocks
has geographical distribution: Strathclyde and Central Scotland.
has lithology description: Lavas, tuffs and volcaniclastic sediments with a wide range of compositions.
has thickness description: To c.1000m
has upper boundary definition: Taken at the base of the Kirkwood Formation; defined as lithological change from volcaniclastic sedimentary rocks into underlying basaltic lavas

Capelaw Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CPW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CPW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41219
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41218
has lithology component: CPW AND
has lithology component: CPW BA
has lithology component: CPW DA
has lithology component: CPW RY
has source info: CPW_49223
has source info: CPW_49427
has source info: CPW_50454
has source info: CPW_51127
has source info: CPW_51146
has source info: CPW_51173
has source info: CPW_52828
has source info: CPW_52986
has obsolete equivalent: CPW mn 68
has obsolete equivalent: CPW mn 775
has obsolete equivalent: CPW mn 774
broader: PDH
has lower boundary definition: Conformable: where fine-grained basalt overlies pink flow-banded rhyolites of the Bell's Hill Volcanic Member.
has geographical distribution: Pentland Hills.
has lithology description: Lower three or four flows are fine-grained basalt, with pyroxene andesite occuring in north east. Upper flow is biotite dacite or biotite rhyolite, pale pink or lilac, silicified and kaolinitised, with large feldspar and biotite phenocrysts.
has thickness description: Attains 175-200m at Green Craig on Allermuir Hill. Thins southwards to less than 80m at Capelaw Hill.
has upper boundary definition: Conformable: where biotite dacite or biotite rhyolite is overlain by basic andesites and olivine basalts of the Allermuir Volcanic Member.

Capelaw Acid Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPWA
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Capelaw Basic Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CPWB
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Climpy Gas Coal (Forth Area)
type: Concept
in scheme: NamedRockUnit
alternative label: CPYG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CPYG COAL
broader: ULGS
has geographical distribution: In the Forth area of Scotland, mainly on Sheet NS95.
has supplementary information: Within the Upper Limestone Formation at a point midway between the basal Index Limestone and the overlying Lyoncross Limestone. Its lateral extent is limited, but it has been worked, and it is a useful stratigraphical horizon.

Coppy Hill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CPYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
broader: NE

Hartshill Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CQ
has current status: CURRENT
has theme: BEDRCK
notation: HtS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41220
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41221
has lithology component: CQ MDST
has lithology component: CQ SDST
has source info: CQ_51257
has source info: CQ_51583
has obsolete equivalent: CQ mn 1937
broader: NE
narrower: JHFW
narrower: JMB
narrower: PAH
narrower: WDMB
narrower: Home Farm Member
narrower: Boon's Member
narrower: THQ
has lower boundary definition: Sharp unconformable contact of coarse beds on weathered tuffaceous Precambrian rocks of the Caldecote Volcanic Formation. Basal beds are red breccias or grey conglomerates.
has geographical distribution: Known extent: from Nuneaton town centre, extending north-west for 5.2km to Worthington Farm (SP 3529 9197 - 3192 9572).
has lithology description: Grey to maroon medium-grained sandstone, glauconitic in upper part. Mudstone present only as rare beds 0.10m thick, or as drapes to sandstone beds.
has thickness description: Thickness in the type area is 275m.
has upper boundary definition: Sharp sedimentary break. Dark grey glauconitic sandstones of the formation are overlain by red mudstone of Purley Shale Formation.

Calattwr Quartzite Member And Hirnant Limestone Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CQHL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has lithology component: CQHL LMST
has lithology component: CQHL QZITE
broader: NA

Coquet Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CQU
has current status: CURRENT
has theme: SPRFCL
notation: CQU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41222
has lithology component: CQU CLAY
has lithology component: CQU GRAV
has lithology component: CQU PEAT
has lithology component: CQU SANDU
has lithology component: CQU SILT
has source info: CQU_49636
has source info: CQU_50918
has source info: CQU_51617
broader: NCAT
has lower boundary definition: Sharp, undulating, erosional contact, mainly on grey tills (diamicton) of the North Pennine or North Sea Coast Glacigenic subgroups, or on bedrock.
has geographical distribution: The valleys of the River Coquet, Aln and Wansbeck and their tributaries, northern England
has lithology description: Mainly sand and gravel forming river terraces and silty, clayey sand forming floodplains and concealing sand and gravel. Including units of silty sand, silt, clay and peat. Clasts mainly sandstone, gritstone, mudstone, limestone and coal.
has thickness description: To 10m
has upper boundary definition: Ground surface, locally covered by peat.

Corallian Group
type: Concept
in scheme: NamedRockUnit
alternative label: CR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41223
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41224
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41225
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41226
has lithology component: CR CAMDST
has lithology component: CR FEST
has lithology component: CR LMST
has lithology component: CR MDST
has lithology component: CR SANDU
has lithology component: CR SDST
has lithology component: CR SILT
has lithology component: CR SLST
has source info: CR_48653
has source info: CR_48779
has source info: CR_49347
has source info: CR_49780
has source info: CR_49781
has source info: CR_50492
has source info: CR_50502
has source info: CR_50811
has source info: CR_50910
has source info: CR_50959
has source info: CR_51432
has source info: CR_52197
has source info: CR_52426
has source info: CR_52641
has source info: CR_52696
has source info: CR_52727
has obsolete equivalent: CR mn 1046
has obsolete equivalent: CR mn 1045
has obsolete equivalent: CR mn 1048
broader: NP
narrower: Abbotsbury Ironstone Formation
narrower: SDT
narrower: Elsworth Rock Formation
narrower: LCG
narrower: LCGCO
narrower: LCGK
narrower: HYB
narrower: HYBK
narrower: Coralline Oolite Formation
narrower: OSCL
narrower: OSS
narrower: UCG
narrower: KTON
narrower: Coral Rag Formation (Southern England)
narrower: NTH
narrower: STFD
narrower: STOU
narrower: Clavellata Formation
narrower: RECF
has lower boundary definition: First appearance of medium- or coarse-grained sand above the Oxford Clay Formation. In some areas, this also defines the top of that Formation but elsewhere, there is an intervening silty unit (West Walton Formation).
has geographical distribution: Dorset to Oxfordshire, and North Yorkshire.
has lithology description: Complex succession of interdigitating limestones, marls, sandstones, sands, siltstones, silts, spiculites, mudstones.
has thickness description: To c.100m
has upper boundary definition: In the Dorset reference area, at the base of the Inconstans Bed (Kimmeridge Clay Formation), which also marks the Oxfordian-Kimmeridgian stage boundary, but elsewhere at the base of the thick mudstone succession that spans that stage boundary (ie Ampthill Clay and equivalents, and Kimmeridge Clay).

Crawfordston Coal (Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CRA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRA COAL
broader: MCMS

Crank Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CRAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRAC COAL
broader: PMCM

Ceiriad Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRAD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Crd
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41228
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41227
has lithology component: CRAD SDST
has lithology component: CRAD SLST
has source info: CRAD_50909
has source info: CRAD_52605
has source info: CRAD_52624
has source info: CRAD_52946
has obsolete equivalent: CRAD CAF
has obsolete equivalent: CRAD mn 2524
broader: NA
has lower boundary definition: Conformably overlies coarse-grained, thickly-bedded turbidites of the Cilan Formation (Harlech Grits Group).
has geographical distribution: St Tudwal's Peninsula, northwest Wales.
has lithology description: Red, brown and green siltstones with subordinate, similarly coloured fine-grained sandstones.
has supplementary information: Formation not assigned to a group.
has thickness description: At least 40m
has upper boundary definition: Conformably overlain by interbedded grey, blue-grey siltstones and mudstones, with thin beds of pale sandstone, of the Nant-y-big Formation.

Crag Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cg
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: NO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41229
has lithology component: CRAG CLAY
has lithology component: CRAG FECRTE
has lithology component: CRAG GRAV
has lithology component: CRAG SANDU
has lithology component: CRAG SILT
has source info: CRAG_49074
has source info: CRAG_49075
has source info: CRAG_50214
has source info: CRAG_50362
has source info: CRAG_51498
has source info: CRAG_51617
broader: Great Britain Superficial Deposits Supergroup
narrower: Coralline Crag Formation
narrower: NCG
narrower: NCRC
narrower: WRCG
narrower: RCG
has lower boundary definition: A sharp, planar unconformity upon strata extending from the Chalk Group in the west to the London Clay Formation of the Thames Group in the east. Usually there is a glauconitic conglomerate of rounded flints at the base of the Crag Group.
has geographical distribution: East Anglia, and extending southwestwards into Hertfordshire.
has lithology description: A suite of shallow-water marine and estuarine sands, gravels, silts and clays deposited on the southwest flank of the North Sea Basin. The sands are characteristically dark green from glauconite but weather bright orange with haematite 'iron pans'. The gravels in the lower part of the group are almost entirely composed of flint. Those higher in the group include up to 10% of quartzite from the Midlands, igneous rocks from Wales, and chert from the Upper Greensand of southeastern England.
has thickness description: To 70m onshore
has upper boundary definition: Overlain by deposits of the Dunwich Group, Albion Glacigenic Group, Britannia Catchments Group or British Coastal Deposits Group. Also interdigitates with the Dunwich Group, from which it can be distinguished by the marine origin of the sediments (all Dunwich Group fromations are fluvial). May be distinguished from the Albion Glacigenic Group by the absence of Northern British erratics in the Crag Group.

Craigie Coal (Dailly)
type: Concept
in scheme: NamedRockUnit
alternative label: CRAI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRAI COAL
broader: LSC

Creag An Loin Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRAN
has current status: CURRENT
has theme: BEDRCK
notation: LO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41230
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41231
has lithology component: CRAN PSAMI
has lithology component: CRAN PSAMM
has lithology component: CRAN PSMGN
has lithology component: CRAN QZITE
has lithology component: CRAN SEMPEL
broader: Glen Banchor Succession
has lower boundary definition: Not exposed.
has geographical distribution: Central Highlands of Scotland. Glen Banchor and Kincraig areas.
has lithology description: Interbanded psammite and micaceous psammite, siliceous psammite, quartzite and semipelite.
has thickness description: Up to 200 m exposed.
has upper boundary definition: Defined by the incoming of coarse granular quartzite beds - transition into overlying An Stac Semipelite and Psammite.

Crane Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRANE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Caradoc And Ashgill Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRAS
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has lithology component: CRAS CONG
has lithology component: CRAS MDST
has lithology component: CRAS WACKE
broader: NP

Crathes Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CRAT
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: CRAT GD
broader: SSCGR

Caerau Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CRAU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRAU COAL
broader: SWMCM

Craven Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRAV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CY
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41232
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41233
has lithology component: CRAV CAMDST
has lithology component: CRAV CHRT
has lithology component: CRAV LMMD
has lithology component: CRAV LMST
has lithology component: CRAV MDST
has lithology component: CRAV SDST
has lithology component: CRAV SLST
has source info: CRAV_49279
has source info: CRAV_49284
has source info: CRAV_50020
has source info: CRAV_50133
has source info: CRAV_50614
has source info: CRAV_50903
has source info: CRAV_51187
has source info: CRAV_51862
has source info: CRAV_52729
has source info: CRAV_52825
has obsolete equivalent: CRAV mn 2079
has obsolete equivalent: CRAV mn 2081
has obsolete equivalent: CRAV mn 2082
has obsolete equivalent: CRAV mn 2083
has obsolete equivalent: CRAV mn 1865
broader: NP
narrower: Ellenthorpe Gill Limestone
narrower: Nuculoceras Nuculum Marine Band [2 Of 3]
narrower: Nuculoceras Nuculum Marine Band [3 Of 3]
narrower: MLDS
narrower: HOM
narrower: ISMB
narrower: PDL
narrower: PECH
narrower: Isohomoceras Subglobosum Marine Band [1 Of 3]
narrower: Isohomoceras Subglobosum Marine Band [2 Of 3]
narrower: Isohomoceras Subglobosum Marine Band [3 Of 3]
narrower: Vallites Eostriolatus Marine Band
narrower: WDF
narrower: PRL
narrower: R1A3
narrower: R1A4
narrower: R1B1
narrower: NSL
narrower: NUST
narrower: LOCL
narrower: LOE
narrower: LSM
narrower: Hodderense Limestone Formation
narrower: TLB
narrower: Bowland Shale Formation
has lower boundary definition: Not exposed or proved over most of its extent, although locally an unconformity above the limestone-dominated Bowland High Group in the Craven Basin or a disconformity above the limestone dominated Clwyd Limestone Group, marks a sharp boundary with the overlying mudstone dominated succession of the Craven Group.
has geographical distribution: Craven Basin, between Clitheroe and Skipton; northeast Wales; Derbyshire and the East Midlands.
has lithology description: Grey to dark grey, siliciclastic to calcareous mudstone, limestone packstone and wackestone in sharp-based beds, with localised sandstone, siltstone and chert and mudmound reef limestones. Formations are typically defined by variations in abundance of mudstone and limestone.
has thickness description: In the Craven Basin at least 1450m; across the Widmerpool half-graben 3000m known and 5000m from seismic; North Wales 400m thick.
has upper boundary definition: Taken at the base of the lowermost thick feldspathic sandstone of the interbedded sandstone, siltstone, mudstone succession of the Millstone Grit Group. In Staffordshire, it is taken at the base of the lowermost quartzitic sandstone of the interbedded sandstone, siltstone, mudstone succession of the Morridge Formation.

Main Craw Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CRAW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRAW COAL
broader: NE

Crayford Silt Formation [Duplicate Code: Use Cfsi]
type: Concept
in scheme: NamedRockUnit
alternative label: CRAY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CRAY C
has lithology component: CRAY Z
broader: NE

Carey River Basalt Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRBA
has current status: CURRENT
has theme: BEDRCK
notation: CRBA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41234
has lithology component: CRBA BALAVA
has source info: CRBA_50458
broader: Ballycastle Sandstone Group
has lower boundary definition: Lowest basalt lava resting on sandstone of Eglish Sandstone Formation.
has lithology description: Basalt lavas.
has thickness description: 38 m.
has upper boundary definition: Highest basalt lava overlain by tuff beds representing base of Glenshesk Tuff Formation.

Crabtree Coal (North Staffordshire And Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: CRBC
has current status: CURRENT
has theme: BEDRCK
notation: Cr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRBC COAL
broader: PLCM

Cleland Roughband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CRBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Creech Barrow Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: CRBL LMST
broader: NE

Crediton Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrBr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41235
has lithology component: CRBR BREC
has source info: CRBR_49280
has source info: CRBR_50782
has source info: CRBR_51912
has source info: CRBR_52249
has obsolete equivalent: CRBR mn 1124
has obsolete equivalent: CRBR mn 1125
has obsolete equivalent: CRBR mn 1126
has obsolete equivalent: CRBR mn 4715
broader: Exeter Group
has lower boundary definition: Overlies unconformably early Permian formations - Knowle Sandstone, Bow Breccia, Cadbury Breccia, Thorverton Sandstone, except in Crediton area, where the Creedy Park Sandstone intervenes.
has geographical distribution: Extends from Nymet Tracey [SS 728 006] in Okehampton District (as part of the 'Crediton Conglomerates' of Edmonds, E A, et al, 1968), into the Exeter district at Knowle [SS 783 015], and thence to Crediton, eastwards through Shobrooke [SS 863 011] to south of Raddon [SS 910 010], east of there, passed into Yellowford Formation.
has lithology description: Reddish brown, poorly to moderately cemented breccia with a silt, sand and clay matrix. Clasts mostly less than 4cm. Clasts of sandstone, siltstone, slate, shale, hornfells, chert, acid lava and tuff, quartz-porphyry, vein quartz, and a variety of tournalinised rocks. Poorly developed bedding in units mostly over 1m thick. Thin interbedded or lenses of red mudstone throughout.
has thickness description: Up to 240m
has upper boundary definition: Overlain by Newton St Cyres Breccia fairly sharply, with feature locally developed at the junction. East of Shute [SS 890 001] overlain by the Shute Sandstone.

Caerbwdy Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cbw
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41236
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41237
has lithology component: CRBS FAREN
has lithology component: CRBS MCASST
has lithology component: CRBS MDST
has lithology component: CRBS PESST
has source info: CRBS_49261
has source info: CRBS_49265
has source info: CRBS_49829
has source info: CRBS_50241
has source info: CRBS_50444
has source info: CRBS_50852
has source info: CRBS_51392
broader: Caerfai Group
has additional age information: Comley to St David's
has lower boundary definition: Conformably overlies the mudstones of the Caerfai Bay Shales Formation.
has geographical distribution: Pembrokeshire.
has lithology description: Fine-grained purple micaceous and feldspathic sandstones, pebbly near the top, with thin mudstone interbeds.
has thickness description: To 150m
has upper boundary definition: Overlain by greenish grey sandstones of the Solva Group. The boundary was considered to be sharp and unconformable by Jones (1940) but Stead and Williams (1971) considered it to be conformable and transitional.

Crag Group And Bytham Sand And Gravel Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRBY
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: NO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q2
has lithology component: CRBY GRAV
has lithology component: CRBY SANDU
broader: NE

Crow Cherts
type: Concept
in scheme: NamedRockUnit
alternative label: CRC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRC CHRT
has source info: CRC_51444
broader: SMGP
has geographical distribution: Typically in the Arkendale area of Yorkshire; locally in the Richmond and Kirby Stephen districts.
has supplementary information: Comprises the Crow Chert and the Second Crow Chert, overlying the Crow Limestone (qv).

Arran Central Complex
type: Concept
in scheme: NamedRockUnit
alternative label: CRCA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CRCA BALAVA
has lithology component: CRCA DI
has lithology component: CRCA FELS
has lithology component: CRCA GB
has lithology component: CRCA GN
has lithology component: CRCA MCGNP
has lithology component: CRCA MCQGB
has lithology component: CRCA PPHY
has lithology component: CRCA QFP
has lithology component: CRCA TUF
broader: Hebridean Province

Crediton Breccias [Obsolete Code: Use Crbr]
type: Concept
in scheme: NamedRockUnit
alternative label: CRCG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Crutherland Coals And House Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CRCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRCH COAL
broader: LSC

Crackers Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CRCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRCK COAL
has lateral equivalent: CRCK st 838
has obsolete equivalent: CRCK mn 1095
broader: PLCM

Crow Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CRCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRCL COAL
has lithology component: CRCL MDST
has lithology component: CRCL SEATM
broader: PLCM
has lithology description: The Crow Coal is widespread but not normally of economic significance because it usually consists of numerous thin seams interbedded with mudstone and seatearth. It has been worked in a few districts for gas production, as the seams are of good quality.

Crutherland Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CRCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRCO COAL
broader: LSC
has geographical distribution: East Kilbride-Strathaven area, Hamilton Sheet (23W).
has lithology description: Coal: coalescence of House, Jaunt and Smithy Coals.

Carscallon Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CRCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRCS SDST
broader: MCMS

Carrickateane Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRCT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: Gowna Group

Corkey Rocks Plug
type: Concept
in scheme: NamedRockUnit
alternative label: CRD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Crow Delf Coal (Forest Of Dean)
type: Concept
in scheme: NamedRockUnit
alternative label: CRDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CRDC COAL
broader: NE

Craighead Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRDL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41744
has lithology component: CRDL CONG
has lithology component: CRDL LMST
has lithology component: CRDL MDST
has source info: CRDL_48694
has source info: CRDL_50759
has source info: CRDL_52310
has obsolete equivalent: CRDL mn 1107
broader: Ardwell Subgroup
has lower boundary definition: Irregular unconformity on pillow lavas. The latter are possibly Balcreuchan Group (Arenig) but could be of much younger (Carodoc) age.
has geographical distribution: Area around the south and east side of Craighead Hill. Girvan, Ayrshire, Scotland.
has lithology description: Massive limestone, with conglomeratic base resting on irregular surface of pillow lava.
has thickness description: To 90m
has upper boundary definition: Not seen (faulted), but thought to be overlain by the Plantinhead Member of the Ardwell Farm Formation.

Crane Dyke Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRDY
has current status: CURRENT
has theme: BEDRCK
notation: CRDY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41745
has lithology component: CRDY BREC
has lithology component: CRDY CLCRET
has lithology component: CRDY MDST
has lithology component: CRDY SDST
has source info: CRDY_49532
has source info: CRDY_51445
has source info: CRDY_51521
has obsolete equivalent: CRDY mn 16
broader: SWAS
has lower boundary definition: The top of the conglomerates belonging to the Isle Port Conglomerate Member.
has geographical distribution: Ayrshire, Scotland.
has lithology description: Grey to brown, fine-grained to pebbly sandstones fining up into siltstones and mudstones with locally developed calcrete nodules, with localised thin beds of mudstone breccia and pebbly mudstone.
has thickness description: About 70 m thick.
has upper boundary definition: The base of the volcanics forming of the Carrick Volcanic Formation.

Creepie Coal (Sanquhar)
type: Concept
in scheme: NamedRockUnit
alternative label: CRE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRE COAL
broader: MCMS

Crathie Sheets
type: Concept
in scheme: NamedRockUnit
alternative label: CREI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: CREI AMPHB
broader: HOMI

Cregennen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CREN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41746
has lithology component: CREN CONG
has lithology component: CREN FTUFF
has lithology component: CREN MDST
has lithology component: CREN MFTUF
has lithology component: CREN SDST
has lithology component: CREN TUFT
has source info: CREN_49059
has source info: CREN_49912
has source info: CREN_51180
has source info: CREN_51886
has obsolete equivalent: CREN mn 1141
has obsolete equivalent: CREN mn 423
has obsolete equivalent: CREN mn 2914
broader: Aran Volcanic Group
narrower: Bryn Brith Member
narrower: Cefn Hir Member
has lower boundary definition: Conformably overlies the felsic tuffs and tuffites of the Offrwm Volcanic Formation.
has geographical distribution: Cadair Idris, southern Snowdonia, North Wales.
has lithology description: Dark grey or black graptolitic mudstones interbedded with felsic acid and mafic tuffs and tuffites in places; sandstones and conglomerates occur locally.
has thickness description: To 350m
has upper boundary definition: Conformably overlain by the felsic tuffs and conglomerate of the Brithion Formation in the north of the Cadair Idris district, and by pillowed basaltic lavas and mafic tuffs of the Llyn y Gafr Volcanic Formation elsewhere within the district.

Cretaceous Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRET
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has lithology component: CRET LMST
has lithology component: CRET SDST
broader: NP

Cromer Forest Bed Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRF
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41747
has lithology component: CRF C
has lithology component: CRF ORMUD
has lithology component: CRF P
has lithology component: CRF S
has lithology component: CRF Z
has source info: CRF_49110
has source info: CRF_49674
has source info: CRF_51041
has source info: CRF_51326
has source info: CRF_52758
has lateral equivalent: CRF st 751
has obsolete equivalent: CRF mn 112
has obsolete equivalent: CRF mn 2582
has obsolete equivalent: CRF mn 4576
has obsolete equivalent: CRF mn 4664
has lateral equivalent: CRF st 60
has lateral equivalent: CRF st 907
has obsolete equivalent: CRF mn 1613
has obsolete equivalent: CRF mn 4383
has lateral equivalent: CRF st 726
broader: Dunwich Group
has lower boundary definition: Rests disconformably on Chalk or on Wroxham Crag Formation, and interdigitates with Wroxham Crag Formation. The interdigitated succession is as follows, from top down: Bacton Member (Cromer Forest-bed Formation); Mundesley Member (Wroxham Crag Formation); Runton Member (upper part, Woman Hithe Gravel of Reid, 1882; Wroxham Crag Formation); Runton Member (lower part, Woman Hithe Clay of Reid, 1882; Cromer Forest-bed Formation); Paston Member (Wroxham Crag Formation); Sheringham Member (Cromer Forest-bed Formation); Sidestrand Member (Wroxham Crag Formation).
has geographical distribution: The formation is restricted to North Norfolk. If further deposits of the Ancaster River were discovered farther west, ie west of the Wash, they would constitute a new formation.
has lithology description: The formation encompasses the fluvial, lacustrine and organic deposits of the postulated "Ancaster River", which is believed to have flowed from the Pennines to the North Sea along a line corresponding approximately to the present north coast of Norfolk. Four members are recognised in north Norfolk coastal sections. The Sheringham Member (lowest member) comprises freshwater organic mud, clay and sand. The Runton Member includes laminated freshwater silty clay. The West Runton Member comprises layers of alluvial clay and organic freshwater mud. The Bacton Member (highest Member) comprises clay and organic mud.
has thickness description: c.6m
has upper boundary definition: Overlain by Middle Pleistocene glacial deposits (Happisburgh, Lowestoft, Sheringham Cliffs and Briton's Lane formations).

Cromarty Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CRFB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has lithology component: CRFB LMST
broader: NE

Crawford Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRFD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRFD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41748
has lithology component: CRFD BALVPW
has lithology component: CRFD BAR
has lithology component: CRFD CHRT
has lithology component: CRFD DOLR
has lithology component: CRFD LAVA
has lithology component: CRFD MDST
has lithology component: CRFD RYTUF
has lithology component: CRFD TUF
has source info: CRFD_51831
broader: NP
narrower: KRK
narrower: RAVN
has lower boundary definition: Faulted.
has geographical distribution: The Southern Uplands of Scotland, and Longford Down in Northern Ireland.
has lithology description: Lava, chert, tuff and mudstone succession.
has thickness description: To about 190m
has upper boundary definition: Thought to be overlain by Glenkiln Shale Formation of the Moffat Shale Group.

Crawfordjohn Dyke
type: Concept
in scheme: NamedRockUnit
alternative label: CRFJ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CRFJ
has revision number: 0
has rock unit rank: DY
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41749
has lithology component: CRFJ GB
has source info: CRFJ_51517
has obsolete equivalent: CRFJ mn 1113
broader: MCPAD
has lower boundary definition: Intrusive.
has geographical distribution: Crawfordjohn area.
has lithology description: Dyke of porphyritic nepheline gabbro intruded into Ordovician wackes of the Southern Uplands Terrane.
has thickness description: Dyke, about 33m wide and 200+m long orientated NW - SE.
has upper boundary definition: Intrusive.

Corfe Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRFM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GY
has predominant age: GY
has youngest age: GY
broader: NE

Croft Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRFT
has current status: CURRENT
has theme: BEDRCK
notation: uc
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41750
has lithology component: CRFT MDST
has lithology component: CRFT SDST
has lithology component: CRFT SLST
has source info: CRFT_51645
broader: Bentleyford Shales Formation
has lower boundary definition: Base of mudstone of above type, resting unconformably on shelly glauconitic limestone of the Lower Comley Limestones.
has geographical distribution: Lilleshall Inlier, Shropshire.
has lithology description: Black, fissile, mudstone interlaminated with micaceous siltstone and very fine-grained sandstone.
has thickness description: 53.75m
has upper boundary definition: Not proved.

Crows-Foot Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CRFTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRFTC COAL
broader: SWLCM

Crinoid Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has lithology component: CRG CALSST
has lithology component: CRG SALMST
has obsolete equivalent: CRG mn 1136
broader: SCR

Craigbardahessiagh Granodiorite
type: Concept
in scheme: NamedRockUnit
alternative label: CRGD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Craigenglen Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CRGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CRGL CAMDST
broader: LWM

Craigmalloch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRGM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRGM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41751
has lithology component: CRGM CONG
has lithology component: CRGM SDST
has lithology component: CRGM SLST
has lithology component: CRGM WACKE
has source info: CRGM_52655
broader: Albany Group
has lower boundary definition: Faulted.
has geographical distribution: Not defined.
has lithology description: Conglomerates, greywackes and flaggy siltstones.
has thickness description: c. 500m
has upper boundary definition: Faulted.

Corallian Formation [Offshore Areas]
type: Concept
in scheme: NamedRockUnit
alternative label: CRGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: HMBG

Crags Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CRGV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CRGV AGG
broader: SSDLO

Crag Hill Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CRH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NORB

Cenrhos Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CRHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CRHC COAL
broader: RA

Crockey Hill Esker Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRHE
has current status: CURRENT
has theme: SPRFCL
notation: CRHE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41754
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41753
has lithology component: CRHE C
has lithology component: CRHE S
has lithology component: CRHE V
has lithology component: CRHE Z
has source info: CRHE_49659
broader: VYORK
has lower boundary definition: Not observed but interpreted to rest discontinuously over older till and/or may interdigitate laterally with interbedded glaciofluvial and glaciolacustrine sand and clay.
has geographical distribution: The Crockey Hill Esker Member is restricted to a narrow north-south to northwest-southeast trending belt to the south of York from Escrick to Fulford.
has lithology description: Pale brown, reddish brown and browish yellow, slightly silty, slightly to very gravelly fine to coarse sand. Gravel is subangular to subrounded and comprises a mixed lithology of sandstone, limestone and quartz with rare igneous clasts. Generally thinly bedded (<20mm). Bedding weakens, becoming disturbed, towards the upper surface, with evidence of cryoturbation. Rare laterally impersistant clay lenses.
has thickness description: Known to be a minimum of 7m in a temporary excavation at Crockey Hill.
has upper boundary definition: Exposed at surface. In places overlain by thin aeolian sands.

Crag Hill Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrHL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OU
has predominant age: OU
has youngest age: OU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41755
has lithology component: CRHL LMST
has lithology component: CRHL SLST
has source info: CRHL_50498
has source info: CRHL_52930
has obsolete equivalent: CRHL mn 1098
broader: NORB
has lower boundary definition: Not seen in any of the outcrops.
has geographical distribution: Restricted to the Craven Inliers, North Yorkshire.
has lithology description: Nodular-bedded argillaceous limestone with siltstone partings.
has thickness description: At least 30m
has upper boundary definition: Defined by the base of the overlying Sowerthwaite or Crummack Formations.

Cross Hill Andesite
type: Concept
in scheme: NamedRockUnit
alternative label: CRHM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Cromdale Hills Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRHQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Cribarth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRIB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NP
narrower: PNRH

Cramond Island Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CRIS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CRIS MCGBAO
broader: MCPAS

Crinkle Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Crk
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41757
has lithology component: CRK PYRBRC
has lithology component: CRK RYLTUF
has lithology component: CRK RYTUF
has source info: CRK_48708
has source info: CRK_50725
has source info: CRK_52441
has obsolete equivalent: CRK mn 1137
has obsolete equivalent: CRK mn 1138
broader: Airy's Bridge Tuff Formation
narrower: Bad Step Tuff
narrower: REG
has lower boundary definition: Base of high-grade rhyolitic pyroclastic rocks. Locally unconformable on older parts of Airy's Bridge Tuff Formation.
has geographical distribution: Crinkle Crags to Scafell, Great Gable, Base Broan and Bell Crag. Yewbarrow, Illgill Head, Cumbria.
has lithology description: Rhyolitic tuffs, lapilli-tuffs and pyroclastic breccias that are mostly very densely welded; rocks are conspicuously garnetiferous. Widespread intercalations of laminated rhyolitic tuff.
has thickness description: 0 - 700m
has upper boundary definition: Contact with overlying formations comprising a mixed succession of bedded pyroclastic rocks and volcaniclastic sandstones, containing lavas and sills of andesite and basaltic andesite.

Carrickmore Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRKM
has current status: CURRENT
has theme: BEDRCK
notation: CRKM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41758
has lithology component: CRKM FEST
has lithology component: CRKM LMST
has lithology component: CRKM MDST
has source info: CRKM_50458
has obsolete equivalent: CRKM CKMB
broader: Ballyvoy Sandstone Formation
has lower boundary definition: Carrickmore Blackband Ironstone (0.6 m) overlain by marine shales.
has lithology description: Shale, dark grey with marine fauna; limestone, shaly, crinoidal, ironstone.
has thickness description: 14 m.
has upper boundary definition: Top of grey shales succeeded by massive pink-red sandstones typical of Ballyvoy Sandstone Formation.

Cromer Knoll Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRKN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KA
broader: NE
narrower: NEPT
narrower: SYS
narrower: Commodore Formation
narrower: Carrack Formation
narrower: Cruiser Formation
narrower: WISA
narrower: VALH
narrower: VICY
narrower: RODY
narrower: ROSO
narrower: Britannia Sandstone Formation

Corsankell Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CRKS
has current status: CURRENT
has theme: BEDRCK
notation: Crks
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CRKS LMST
broader: Caaf Water Limestone Formation

Carrick Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRKV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRKV
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41759
has lithology component: CRKV BA
has lithology component: CRKV BAANDT
has lithology component: CRKV CONG
has lithology component: CRKV SDST
has lithology component: CRKV SLST
has lithology component: CRKV TUF
has lithology component: CRKV VCSST
has source info: CRKV_49512
has source info: CRKV_51673
has obsolete equivalent: CRKV mn 4504
broader: LNK
has lower boundary definition: Marked by basalts and basaltic andesites conformably above the predominantly sandstone succession of the Swanshaw Sandstone Formation.
has geographical distribution: South and Central Ayrshire, Scotland. Farther east, the volcanic pile near Cumnock is attributed to the Duneaton Volcanic Formation.
has lithology description: A volcanic succession of basalt and basaltic andesite sheets and flows with subordinate volcaniclastic and epiclastic sandstones and conglomerates.
has thickness description: About 600m
has upper boundary definition: The unconformable junction with the Upper Devonian Stratheden Group.

Crickley Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRKY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41760
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41762
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41761
has lithology component: CRKY CAMDST
has lithology component: CRKY LMST
has source info: CRKY_48756
has source info: CRKY_48920
has source info: CRKY_49459
has source info: CRKY_49480
has source info: CRKY_49481
has source info: CRKY_49484
has source info: CRKY_50051
has source info: CRKY_50324
has source info: CRKY_50541
has source info: CRKY_51129
has source info: CRKY_51200
has source info: CRKY_51291
has source info: CRKY_52260
has source info: CRKY_52431
has source info: CRKY_52641
has source info: CRKY_52644
has source info: CRKY_52685
has source info: CRKY_53048
has obsolete equivalent: CRKY mn 1131
has obsolete equivalent: CRKY mn 2612
has obsolete equivalent: CRKY mn 3236
has obsolete equivalent: CRKY mn 1649
is obsolete equivalent of: CRKY CLCL
broader: Birdlip Limestone Formation
has additional age information: Murchisonae Zone.
has lower boundary definition: Upward transition from ferruginous, bioturbated, sandy, muddy shell-detrital limestone (Leckhampton Member) into limestones as described in lithology.
has geographical distribution: Mid-Cotswolds. Absent east of Northleach, and in north Cotswolds due to overstep by (or passage into) lower part of Cleeve Cloud Member. Southern limit somewhat uncertain, (see Barron, A J M, et al, 1997, fig.4).
has lithology description: Pale grey to yellowish brown limestones; lower part dominated by medium- to coarse-grained ooidal shell-fragmental grainstone ('Lower Limestone'), passing up into rubbly, poorly sorted, shelly, shell-detrital, moderately to highly pisoidal grainstones and packstones ('Pea Grit') with thin marl beds. South of Painswick, the succession is apparently replaced by ooidal grainstones comprising the Frocester Hill Oolite and Selsey Hill Oolite of Mudge, D C, 1978a, but the relationship between these strata and the type Crickley Member is uncertain.
has thickness description: Typically about 7m. Type section (Crickley Hill); c.15.7m, probably the maximum (Ager, D V, 1969).
has upper boundary definition: Upward gradation from pisoidal limestones as described in lithology, into ooidal grainstones (Cleeve Cloud Member) in mid and north Cotswolds; a non-sequence marked by a hardground in southern Cotswolds (Mudge, D C, 1978a).

Craigies Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Craighall Conglomerate Formation

Corrie Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CRLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CRLM LMST
broader: NE

Creagan Loisgte Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRLO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Port Askaig Tillite Formation

Creag Liath Pelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRLP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CRLP PEL
broader: Glen Girnock Calcareous Formation

Carrickmacsparrow Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CRM LMST
broader: Dartry Limestone Formation
has lower boundary definition: Conformable but abrupt upward change from dark grey, cherty biomicrosparite
has geographical distribution: Not defined.
has lithology description: Fawn, coarse-grained crinoidal biosparite (packstone); abrupt contacts above and below with bedded, dark grey, cherty biomicrosparite.
has thickness description: 4m in type section, maximum of 11m elsewhere.
has upper boundary definition: Conformable but abrupt upward change to dark grey, cherty biomicrosparite

Cuniger Rock Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CRMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Crawford Group And Moffat Shale Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRMF
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SL
has lithology component: CRMF AROC
has lithology component: CRMF BALVPW
has lithology component: CRMF BAR
has lithology component: CRMF CHRT
has lithology component: CRMF DOLR
has lithology component: CRMF LAVA
has lithology component: CRMF MDST
has lithology component: CRMF RYTUF
has lithology component: CRMF TUF
broader: NP
has lithology description: See the Lithology descriptions for the component groups.

Cromhall Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: CRML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRML COAL
has source info: CRML_52591
broader: SWLCM
has additional age information: The Langsettian age is based on Kellaway and Welch (1993, p.88), but there is a possibility that the seam is of late Namurian age.
has supplementary information: According to Kellaway and Welch (1993, p.88) the Cromhall "Vein" of the Coalpit Heath Basin are thought to lie within the Lower Coal Measures Formation, but elsewhere in the same publication (p.65) the Cromhall "Vein" is described as being part of the "Quartzitic Sandstone Group", which was considered locally to be the uppermost part of the "Millstone Grit".

Creggan Mooar Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41763
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41764
has lithology component: CRMR MDST
has lithology component: CRMR SDST
has lithology component: CRMR SLST
has source info: CRMR_50459
has source info: CRMR_50554
has source info: CRMR_51128
has source info: CRMR_51179
has source info: CRMR_52552
has obsolete equivalent: CRMR mn 2740
has obsolete equivalent: CRMR mn 2786
broader: MANX
has lower boundary definition: In stratigraphical contact at the base with the Glen Rushen Fornmation, which is marked by a change from a mudstone-dominated facies to a mudstone/sandstone facies with manganiferous ironstone beds;.
has geographical distribution: Isle of Man.
has lithology description: A dark grey mudstone, with pale siltstone laminae and sandstone [quartz arenite] as thin to medium beds, distinctive manganiferous ironstone laminae.
has thickness description: About 500 m thick.
has upper boundary definition: The top is faulted against the Dalby Group of the Niarbyl Fm, which is marked by a change from a mudstone/sandstone facies with manganiferous ironstone beds to a sandstone-dominated facies.

Craigmaddie Muir Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRMS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CRMS MDST
has lithology component: CRMS PESST
has lithology component: CRMS SDST
has obsolete equivalent: CRMS mn 1108
has obsolete equivalent: CRMS mn 1110
has obsolete equivalent: CRMS mn 1109
broader: LWM

Crugan Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRMU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OW
has predominant age: OW
has youngest age: OW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41765
has lithology component: CRMU MDST
has source info: CRMU_49448
has source info: CRMU_51585
has obsolete equivalent: CRMU mn 1172
broader: NP
has lower boundary definition: Disconformally overlies the dark grey graptolitic mudstones of the Nod Glas Formation.
has geographical distribution: Area around Pwllheli, northwest Wales.
has lithology description: Brown-grey and green siliceous mudstones.
has thickness description: 600m+
has upper boundary definition: Not present in the area.

Carron Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41766
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41767
has lithology component: CRN CONG
has lithology component: CRN SDST
has source info: CRN_48869
has source info: CRN_48880
has source info: CRN_48881
has source info: CRN_50011
has source info: CRN_51457
has source info: CRN_51673
has source info: CRN_51745
has obsolete equivalent: CRN mn 808
has obsolete equivalent: CRN mn 4015
has obsolete equivalent: CRN mn 1360
has obsolete equivalent: CRN mn 4470
broader: SHG
has lower boundary definition: Grey, laminated sandy siltstone of the Cowie Harbour Siltstone Member conformably overlain by a thick sequence of red, fine- to medium-grained, trough cross-bedded and horizontally-laminated sandstone
has geographical distribution: North-eastern Midland Valley, Stonehaven area.
has lithology description: A fine- to coarse-grained locally pebbly lithic sandstone with lenses of conglomerate.
has thickness description: Measured as between 1200 m to 1800 m thick in the type area, and broadly consistent across unit extent, it is presumed to lap onto basement of the Highland Border Complex and probable Dalradian rocks, and also to be overlapped by younger groups.
has upper boundary definition: At the base of a thickly-bedded or massive conglomerate of the Downie Point Conglomerate Member of the Dunnothar Castle Conglomerate Formation overlies planar bedded or cross-bedded pebbly sandstone

Crinoid Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CRNB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Carne Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRNE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cne
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41769
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41768
has lithology component: CRNE BREC
has lithology component: CRNE MDST
has lithology component: CRNE SDST
has lithology component: CRNE SLST
has source info: CRNE_51906
has obsolete equivalent: CRNE mn 1802
has obsolete equivalent: CRNE mn 4386
broader: Gramscatho Group
has additional age information: Late Eifelian to ? Givetian.
has lower boundary definition: Conformable above Pendower Formation.
has geographical distribution: Roseland and Meneage areas, south Cornwall.
has lithology description: Sandstone with interbedded, laminated slaty mudstone and siltstone. The sandstones are predominantly fine- to medium-grained and form thinning- and fining-upwards sequences. Channel fills and slumps are evident in the lower to middle parts of the Formation, while the upper part is characterised by thinly to thickly bedded turbidites.
has thickness description: Structural thickness of c.240; c.250m in Type Section.
has upper boundary definition: Conformable below Roseland Breccia Formation.

Cornstone Beds (Of Inverness, Nairn, Banff)
type: Concept
in scheme: NamedRockUnit
alternative label: CRNI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has lithology component: CRNI CALSST
has lithology component: CRNI CHRT
has lithology component: CRNI LMST
has lithology component: CRNI SALMST
is obsolete equivalent of: CRNI ELCA
broader: Forres Sandstone Group

Crovie Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41773
has lithology component: CRO BREC
has lithology component: CRO CONG
has lithology component: CRO LMST
has lithology component: CRO MDST
has lithology component: CRO SDST
has lithology component: CRO SLST
has source info: CRO_49235
has obsolete equivalent: CRO mn 1167
broader: ORS
narrower: Cabrach Sandstone Formation
narrower: NAB
narrower: PNN
narrower: Gamrie Bay Sandstone Formation
narrower: Counter Head Siltstone Formation
narrower: DCST
narrower: Dundarg Sandstone Formation
has lower boundary definition: Drawn at the base of the Dundarg Sandstone Formation (Crovie Sandstone Group) where it rests unconformably upon rocks of the Macduff Formation: conglomerate resting upon schist.
has geographical distribution: Crovie, near Banff, in the Grampian region.
has lithology description: Conglomerates, sandstones, flags and marls with ribs of limestone and pale red sandstone.
has thickness description: c.275m
has upper boundary definition: Unconformably overlain by the Middle Devonian Gardenstown Congomerate Formation (GDC) of the Inverness Sandstone Group.

Crow Coal (Dungannon: Duckmantian)
type: Concept
in scheme: NamedRockUnit
alternative label: CROC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CROC COAL
has obsolete equivalent: CROC mn 1170
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Crow Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CROL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CROL LMST
has source info: CROL_51047
has lateral equivalent: CROL CGLM
broader: SMGP
has thickness description: c.3.6m

Crossdale Mudstone
type: Concept
in scheme: NamedRockUnit
alternative label: CROM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CroM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41774
has lithology component: CROM MDST
has lithology component: CROM SDST
has source info: CROM_48721
has source info: CROM_49288
has source info: CROM_49972
has obsolete equivalent: CROM mn 1159
has obsolete equivalent: CROM mn 1160
broader: MG
has lower boundary definition: Sharp basal boundary placed at the change from the sandstone-dominated Silver Hills Sandstone to the overlying mudstone-dominated Crossdale Mudstone.
has geographical distribution: Craven Basin area, northwest England.
has lithology description: Mainly blocky grey to dark grey laminated and fossiliferous mudstone, which becomes fissile on weathering. The mudstone contains siderite mudstone lenses and nodules at some levels. There are several thin marine bands composed of dark grey, platy mudstone with scattered oblate carbonate septarian nodules. Thin beds of sandstone are present and notably common in the uppermost few metres.
has supplementary information: Note that the beds comprising the "informal" Crossdale Mudstone form parts of the two adjacent Silsden and Samlesbury formations, within the Millstone Grit Group.
has thickness description: 14 to 23m in Crossdale; estimated 165m in Dolphinholme area.
has upper boundary definition: Sharp upper boundary placed at the change from the mudstone-dominated Crossdale Mudstone overlain by the Accerhill Sandstone, a thickly bedded sandstone-dominated succession.

Cromarty Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CROS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: SELE

Cowglen Rough Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: CROU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CROU COAL
has lateral equivalent: CROU GMC
broader: LSC

Crow Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: CROW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CROW COAL
broader: PMCM

Coire Riabhach Phosphatic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRPH
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41775
has lithology component: CRPH GLSST
has lithology component: CRPH PHOST
has source info: CRPH_50718
broader: IHEB
has additional age information: Coniacian to Santonian in Mortimore et al., (2001).
has lower boundary definition: Conformable (or a non-sequence at an erosion surface) with the underlying Lochaline White Sandstone Formation.
has geographical distribution: Limited to the Beinn Iadain area. Because of its relative thinness it is questionable as to whether this bed is a `mappable? unit and as such worthy of formational status, however it is prominent in sections logged in Morvern and may prove the correlative of the basal unit of the Gribun Chalk Formation as mapped on Mull where glauconite is seen in the sequences associated with erosional surfaces. It may also be a key link with the Northern Ireland succession where Mortimore et al. correlate it with the Cloghfin Sponge Formation at the base of the Ulster White Limestone Group.
has lithology description: Up to five beds of glauconitic sand with phosphate nodules and fossil casts.
has thickness description: Usually less than one metre.
has upper boundary definition: Unconformable (or a non-sequence at an erosion surface) with the overlying Gribun Chalk Formation.

Creedy Park Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrPS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41776
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41777
has lithology component: CRPS BREC
has lithology component: CRPS CLAY
has lithology component: CRPS SANDU
has lithology component: CRPS SDST
has lithology component: CRPS SILT
has source info: CRPS_49280
broader: Exeter Group
has lower boundary definition: Rests unconformably on Knowle Sandstone.
has geographical distribution: First mapped in Creedy Bridge area [SS 847 012]; extends westwards through and north of Crediton to the Knowle area. Not recognised in the Okehampton district (Edmonds and others, 1968).
has lithology description: Reddish brown sandstone, mostly fine-grained and with some clay and silt; locally with breccia beds. Weathers to sand near surface.
has thickness description: Up to 80m in Crediton area.
has upper boundary definition: Overlain by Crediton Breccia; may pass laterally in places into Crediton Breccia.

Crathie Point Calc-Silicate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRPT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CrPt
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41778
has lithology component: CRPT CALSIR
has lithology component: CRPT MLMST
has lithology component: CRPT PSAMM
has lithology component: CRPT SEMPEL
has lithology component: CRPT SPELGN
has source info: CRPT_48670
has source info: CRPT_49235
has source info: CRPT_50001
has source info: CRPT_51142
has obsolete equivalent: CRPT mn 2879
has obsolete equivalent: CRPT mn 1112
broader: Cairnfield Calcareous Flag Formation
has lower boundary definition: Base of lowest limestone bed in sequence of flaggy semipelites and psammites of Cairnfield Calcareous Flag Formation.
has geographical distribution: From coast at Crathie Point [NJ 5475 6725 - 5495 6715], as far inland as Broom [NJ 543 662], south of which it cannot be distinguished from the rest of the Cairnfield Calcareous Flag Formation.
has lithology description: Thin-bedded flaggy calc-silicate, calcareous semipelite and impure metacarbonate rock, with beds of metalimestone; bands of distinctive schistose garnet-muscovite-biotite semipelite in upper part. Calcareous psammite beds sparse but more abundant near top.
has thickness description: c.200 to 250m on coast section, but locally tightly folded; not measurable inland.
has upper boundary definition: Transitional decrease in frequency of limestone beds and increase in proportion of calc-psammites relative to calc-semipelites.

Craigievar Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41779
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41780
has lithology component: CRR CALSIR
has lithology component: CRR CONG
has lithology component: CRR MSDR
has lithology component: CRR PEL
has lithology component: CRR PSAMG
has lithology component: CRR PSAMM
has lithology component: CRR PSMQZ
has lithology component: CRR QZITE
has lithology component: CRR SEMPEL
has source info: CRR_49289
has source info: CRR_51809
has obsolete equivalent: CRR mn 1288
broader: Tayvallich Subgroup
has lower boundary definition: Not seen: a major antiform, now largely obscured by the Tomnaverie, Coull and Lumphanan intrusions, causes the formation to be flanked by younger rocks both to the north and to the south.
has geographical distribution: Occupies most of the central part of Sheet 76W (Alford) extending into the eastern part of Sheet 75E (Glenbuchat) and the western part of Sheet 76E (Inverurie).
has lithology description: Interlayered psammite, semipelite and pelite, with semipelite dominant. Contains beds of calc-silicate rock, especially in the vicinity of Towie (NJ 440 127).
has thickness description: Several kilometres, but not measurable due to the intense folding and migmatisation over most of the outcrop.
has upper boundary definition: Change to the more uniform semipelitic lithology, but with mappable units of gritty psammite, which characterises the Suie Hill Formation. Upper contact to the west of the Rhynie Devonian inlier occurs at the base of a magnetic pelite unit (NJ 394 246 to NJ 459 215). To the east of the Rhynie Devonian it runs through poorly exposed ground (NJ 471 165 to NJ 622 184), where it abuts the Bennachie Granite. The fault-displaced contact reappears at NJ 630 134 to NJ 650 134.

Carrack Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KA
broader: Cromer Knoll Group
narrower: SKSA

Crigglestone Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CRRO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRRO SDST
broader: PMCM

Craig Rofft Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRRS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41781
has lithology component: CRRS LMST
has lithology component: CRRS SDST
has source info: CRRS_52325
has source info: CRRS_52509
broader: Cefn Mawr Limestone Formation
has additional age information: Brigantian (based on unpublished foraminiferal determinations by BGS)
has lower boundary definition: Base not exposed, but should be taken at entry of sandy limestones and calcareous sandstones above underlying sand-free limestones of the Cefn Mawr Limestone Formation.
has geographical distribution: Great Orme at Llandudno (SH 76 83), North Wales.
has lithology description: Red and purple, fine- to medium-grained, sandy limestone (grainstone) and calcareous sandstone with scattered quartz pebbles and lenses of coarse shell material. Lower part is bioturbated and mottled; upper 2m are cross-stratified. The sandstone forms the upper part of a Brigantian shoaling-upwards cycle and formed in a shallow water, upper shoreface setting. The Craig Rofft Sandstone is currently shown on Sheet 94 within the Great Orme Limestone, a redundant Asbian formation now superceded by the Loggerheads Limestone Formation. However, unpublished foraminiferal dating by BGS has shown that limestones underlying the limestone member are Brigantian in age. These limestones therefore equate with the Cefn Mawr Limestone Formation and their lithology (dark grey packstones) confirms that they should be included in that formation, as must the Craig Rofft Sandstone.
has thickness description: 4 to 5m
has upper boundary definition: Undulating upper surface of calcareous sandstone beneath a thin, impersistent, calcretised porellanous limestone bed exposed in Craig Rofft Quarry.

Crawshaw Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CRS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CRS MDST
has lithology component: CRS SDST
has lithology component: CRS SLST
has source info: CRS_50592
has lateral equivalent: CRS SBF
broader: PLCM
has lower boundary definition: The base of the first sandstone or sandstones above the Subcrenatum Marine Band (the base of the Pennine Lower Coal Measures Formation).
has geographical distribution: South Yorkshire, Derbyshire, Nottinghamshire & Leicestershire.
has lithology description: Medium to coarse-grained, locally pebbly sandstone, massive or cross-bedded.
has thickness description: Up to 55 thick.
has upper boundary definition: The top of the last main sandstone above the Subcrenatum Marine Band (the base of the Pennine Lower Coal Measures Formation) and below the Listeri Marine Band.

Corley Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CRSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CRSA CONG
has lithology component: CRSA SDST
has source info: CRSA_49363
has source info: CRSA_49789
has obsolete equivalent: CRSA mn 1053
broader: KRS

Carrickaness Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Crossdale Grit
type: Concept
in scheme: NamedRockUnit
alternative label: CRSG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lateral equivalent: CRSG NOT
broader: Claughton Member

Caradoc Shales
type: Concept
in scheme: NamedRockUnit
alternative label: CRSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Cradley Silts Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41782
has lithology component: CRSI PEAT
has lithology component: CRSI SANDU
has lithology component: CRSI SILT
has source info: CRSI_50448
broader: NE
has lower boundary definition: Placed at base of Bed A3 in an augerhole section proved at Colwall, Hereford and Worcester, where it overlies red-brown clays (Bed A2) of the White House Silts. (Barclay, et al, 1992).
has geographical distribution: Colwall, in headwaters of Cradley Brook, Hereford and Worcester.
has lithology description: Grey fossiliferous, clayey silt with sand grains and local rock fragments and a peat layer up to 0.1 near top.
has thickness description: 1 metre.
has upper boundary definition: Placed at base of Beds A7a and B7a, in Colwall augerholes, where they are overlain by stony clay of the Colwall Gelifluctate.

Corallian Beds (Skye)
type: Concept
in scheme: NamedRockUnit
alternative label: CRSK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: NE

Crathie Schist And Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CRSL CALSIR
has lithology component: CRSL MLMST
has lithology component: CRSL PEL
has lithology component: CRSL PELGP
has lithology component: CRSL PSAMM
has lithology component: CRSL SEMPEL
has source info: CRSL_49438
has source info: CRSL_50001
broader: Blair Atholl Subgroup

Carronrigg Smithy Coal (Drumbowie)
type: Concept
in scheme: NamedRockUnit
alternative label: CRSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRSM COAL
broader: LSC

Caerbwdy Sandstone Formation And Solva Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRSO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ED
has lithology component: CRSO MCASST
has lithology component: CRSO MDST
has lithology component: CRSO SDST
broader: NE
has lithology description: See the Lithology descriptions for the component units.

Clashnoir Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41783
has lithology component: CRSP PEL
has lithology component: CRSP SEMPEL
broader: Blair Atholl Subgroup
has lower boundary definition: The top of the Kylnadrochit Semipelite Member, Ailnack Phyllite and Limestone Formation, where strongly layered lithologies with calcareous character pass up into more pelitic lithologies.
has geographical distribution: Braes of Glenlivet.
has lithology description: Semipelite and pelite, grey, weakly banded, graphitic in part.
has thickness description: c. 330m in type section in Braes of Glenlivet.
has upper boundary definition: The incoming of the first grey limestone at the base of the Inchrory Limestone Formation.

Corstorphine Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CRST
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: CRST MCGBAO
has lithology component: CRST PCT
broader: MCPAS

Corton Formation [Obsolete/Duplicate Code: See Corf]
type: Concept
in scheme: NamedRockUnit
alternative label: CRTB
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: CRTB CLAY
has lithology component: CRTB GRAV
has lithology component: CRTB SANDU
has lithology component: CRTB SILT
has obsolete equivalent: CRTB mn 1067
broader: NE
has lithology description: Very silty, sandy clay or clayey sand, commonly laminated; with few pebbles. Sand lenses occur. [Generic description: from East Anglian data].

Carriteth Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: CRTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CRTC COAL
has lateral equivalent: CRTC st 100
broader: SCG
has thickness description: c.0.5m

Cropthorne Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRTD
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41784
has lithogenesis: FLUV
has lithology component: CRTD C
has lithology component: CRTD P
has lithology component: CRTD S
has lithology component: CRTD V
has lithology component: CRTD Z
has source info: CRTD_49128
has source info: CRTD_49129
has source info: CRTD_50269
has source info: CRTD_50676
has source info: CRTD_50812
has source info: CRTD_50918
has source info: CRTD_50978
has source info: CRTD_51403
has source info: CRTD_52088
has source info: CRTD_52614
has obsolete equivalent: CRTD mn 54
has obsolete equivalent: CRTD mn 182
has obsolete equivalent: CRTD mn 1148
has obsolete equivalent: CRTD mn 1149
has obsolete equivalent: CRTD mn 1631
has obsolete equivalent: CRTD mn 3055
has obsolete equivalent: CRTD mn 1627
has obsolete equivalent: CRTD mn 1632
broader: Warwickshire Avon Valley Formation
has additional age information: Mid Pleistocene (MI Stage 7 to 6).
has lower boundary definition: Unconformable, commonly channelled base, resting on Wolston Formation or Baginton Formation in upper Avon, or farther downstream (beyond Coventry), on Lower Jurassic or Triassic bedrock.
has geographical distribution: Avon Valley, Rugby to Tewkesbury (BGS Sheets 183, 184, 199, 200, 201, 216).
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold phase sands and gravels that underlie the Avon Fourth Terrace of Tomlinson (1925) and of BGS maps. Dominated by clasts of "Bunter" quartz/quartzite lithologies with subordinate flint. Locally includes the organic Ailstone Bed, assigned to MIS 7, at its base. Probably equates with the Kidderminster Station Member of the Severn Valley Formation. (See also Compiler's notes under Supplementary Information.)
has supplementary information: (A) The unit is referred to here as Cropthorne Sand and Gravel Member, though in Bowen 1999, and in previous BGS use it was simply Cropthorne Member. (B) Terrace surface typically some 11 to 15m above modern Avon alluvial floodplain in the Rugby area, increasing downstream to c.25m near the confluence with the Severn at Tewkesbury. (C) The upper boundary is given as "ground surface" though head, colluvium or soil deposits may intervene. (D) All Avon (and Severn) terraces need review; classification of some outcrops on existing maps is dubious. Thus some Previous Names are necessarily approximate.However, despite problems with lower terraces, it appears that the Cropthorne (Avon 4) meets the Kidderminster Station (Severn 4) fairly convincingly. (E) Accounts prior to Bowen (1999) include deposits now separated as the Strensham Member.
has thickness description: 0 to 6m
has upper boundary definition: Ground surface.

Crovie Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRTI
has current status: CURRENT
has theme: SPRFCL
notation: Cr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41785
has lithology component: CRTI DMTN
has lithology component: CRTI GRAV
has lithology component: CRTI SANDU
has lithology component: CRTI SICL
has source info: CRTI_49235
has source info: CRTI_50626
has obsolete equivalent: CRTI mn 2639
broader: East Grampian Glacigenic Subgroup
has lower boundary definition: Unconformable on bedrock or on older Quaternary deposits, including (locally) the Whitehills Glacigenic Formation.
has geographical distribution: Elgin to Fraserburgh, inland to New Pitsligo [NJ 880 560].
has lithology description: Till with strong input from local psammitic rocks together with erratics from the west or northwest. Colour variable, commonly reddish-brown.
has thickness description: To 5m
has upper boundary definition: Land surface, or buried by late glacial or post glacial deposits.

Craigballyharkey Tonalite
type: Concept
in scheme: NamedRockUnit
alternative label: CRTO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OT
has predominant age: OT
has youngest age: OT
broader: NP

Carneddol Rhyolitic Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRTU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CRT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41786
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41787
has lithology component: CRTU RYTUF
has source info: CRTU_50909
broader: LIG
narrower: NYGD
narrower: Bodgadle Member
has lower boundary definition: Overlies Foel Ddu Rhyodacite.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: Rhyolitic ash-flow tuffs.
has thickness description: 370-590m
has upper boundary definition: Underlies and is partly interleaved with the Yoke House Formation and (locally) Nod Glas Formation.

Crumpy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CRU COAL
broader: ULGS

Cruachan Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CRUA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CRUA GN
has lithology component: CRUA GNR
has lithology component: CRUA QDI
has lithology component: CRUA TO
has obsolete equivalent: CRUA mn 1171
broader: Etive Pluton
narrower: MGCRU
narrower: MDCRU

Crug Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CRUG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Cruiser Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRUI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KL
has predominant age: KL
has youngest age: KL
has source info: CRUI_51880
broader: Cromer Knoll Group

Crumbouke Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: CRUM
has current status: CURRENT
has theme: BEDRCK
notation: Cb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CRUM COAL
has obsolete equivalent: CRUM mn 1173
has lateral equivalent: CRUM st 236
broader: PMCM

Craighead Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRV
has current status: CURRENT
has theme: BEDRCK
notation: CRV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41788
has lithology component: CRV BALAVA
has lithology component: CRV CHRT
has source info: CRV_49784
has source info: CRV_51574
has obsolete equivalent: CRV mn 132
broader: NP
narrower: Barneil Member
has lower boundary definition: Lower boundary not seen.
has geographical distribution: Craighead Inlier, Girvan.
has lithology description: Basaltic pillow lava, with associated bedded chert.
has thickness description: At least 500 m thick.
has upper boundary definition: Unconformably overlain by the Craighead Limestone Formation.

Crockanaver Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRVL
has current status: CURRENT
has theme: BEDRCK
notation: CRVM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41789
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41790
has lithology component: CRVL LMST
has source info: CRVL_49803
broader: Ballyshannon Limestone Formation
has lower boundary definition: Abrupt contact on dark blue-grey, crinoidal, argillaceous packstones of normal Ballyshannon Limestone Formation.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Limestone, medium grey-fawn biosparites, oolitic, crinoidal, thick beds, stylolitic, shale-free, quartz-clastic.
has thickness description: 0 - 15m
has upper boundary definition: Variable, either with shales/nodular limestone bed that marks base of succeeding Ederny Limestone Member or, rarely, with argillaceous packstones typical of normal Ballyshannon Limestone Formation.

Crawley Member
type: Concept
in scheme: NamedRockUnit
alternative label: CRW
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41792
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41791
has lithology component: CRW COAL
has lithology component: CRW CONG
has lithology component: CRW MDST
has lithology component: CRW SDST
has lithology component: CRW SEATM
has source info: CRW_49037
has source info: CRW_49279
has source info: CRW_51293
has obsolete equivalent: CRW mn 1114
broader: Grovesend Formation
has lower boundary definition: In the type section, greyish blue, brown, yellow and red mudstone of the Crawley Member overlies conformably dark grey, carbonaceous mudstone of the Witney Coal Member.
has geographical distribution: Oxfordshire Coalfield; in the subsurface only.
has lithology description: Thick beds of red mudstone with common desiccation cracks, interbedded with conglomerate, grey seatearth, sandstone and mudstone and scarce thin coals
has thickness description: Maximum thickness of 205 m in the type section.
has upper boundary definition: In the type section, dark grey, carbonaceous mudstone with basal coal of the Burford Coal Member, overlies conformably grey to red mudstone-dominated succession of the Crawley Member.

Crummock Water Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CRWA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: NEDP

Crowland Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CRWB
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Crow Coal (Dungannon: Pendleian)
type: Concept
in scheme: NamedRockUnit
alternative label: CRWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRWC COAL
has obsolete equivalent: CRWC mn 1169
broader: MG

Crease Limestone And Whitehead Limestone (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CRWT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has lithology component: CRWT LMST
broader: PEMB
has lithology description: See the Lithology descriptions for the component formations.

Coralliferous Group
type: Concept
in scheme: NamedRockUnit
alternative label: CRX
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ST
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41793
has lithology component: CRX ARLMST
has lithology component: CRX CSSST
has lithology component: CRX MDST
has source info: CRX_49351
has source info: CRX_51452
has source info: CRX_51908
has source info: CRX_53021
has obsolete equivalent: CRX mn 1049
broader: NP
has lower boundary definition: Drawn at the base of the Coralliferous Group where shale rests conformably upon conglomerate of the Conglomerate Group.
has geographical distribution: Marloes Bay, Pembrokeshire.(now Dyfed).
has lithology description: Grey shales and mudstones, thin calcareous grits, and argillaceous limestones with abundant corals.
has thickness description: 170m max./approx.
has upper boundary definition: Drawn at the conformable upward passage of the Limestone Beds of the Coralliferous Group with the sandstone of the Sandstone Group.

Cryne Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: CRY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CRY COAL
broader: LSC

Craig-Y-Cwm Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRYC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cryc
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41794
has lithology component: CRYC CLCRET
has lithology component: CRYC CONG
has lithology component: CRYC MDST
has lithology component: CRYC SDST
has source info: CRYC_50094
has source info: CRYC_50095
has source info: CRYC_51233
has obsolete equivalent: CRYC mn 3436
broader: QCG
has lower boundary definition: Topmost surface of a persistent calcrete, overlain by quartz pebble conglomerate, the latter appearing in the succession for the first time at this level (Lovell, 1978).
has geographical distribution: From Blaen Onneu area near Crickhowell, Gwent eastwards and southwards to Pontypool, Gwent, South Wales.
has lithology description: Mainly quartz pebble conglomerates, with fine-grained quartzitic grey-green sandstones, pebbly sandstones and red-brown mudstones.
has thickness description: 5 m. to a maximum of about 12 m.
has upper boundary definition: Surface cut in quartz pebble conglomerates, overlain by pale yellow to white micaceous sandstone of the Garn-gofen Formation (Lovell, 1978).

Crychan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CRYH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CcF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has obsolete equivalent: CRYH mn 17
broader: NP

Collyhurst Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41795
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41796
has lithology component: CS SANDU
has lithology component: CS SDST
has source info: CS_48706
has source info: CS_49371
has source info: CS_52464
has source info: CS_52609
has obsolete equivalent: CS mn 2651
has obsolete equivalent: CS mn 3296
broader: Appleby Group
has lower boundary definition: Lower boundary is a major plane of unconformity, generally on reddened Carboniferous Coal Measures strata.
has geographical distribution: Lancashire and Cheshire.
has lithology description: A soft red sandstone with abundant beds of "millet seed" sand grains alternating with beds of fine-grained sharp sand (Tonks, and others, 1931); some interbedded grey sandstones locally.
has thickness description: Ranges from 0 - 262m in type area and 0 - 715m around Formby (Falcon and Kent, 1960).
has upper boundary definition: Taken at the point where red mudstone and siltstone, characteristic of the overlying Manchester Marls, become predominant over sandstone.

Calder Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CSa
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41797
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41798
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41799
has lithology component: CSA MDST
has lithology component: CSA SDST
has lithology component: CSA SLST
has source info: CSA_49801
has source info: CSA_50613
has obsolete equivalent: CSA mn 3211
has obsolete equivalent: CSA mn 12
broader: SSG
has lower boundary definition: The lower boundary on the underlying St Bees Sandstone Formation is sharp and is taken at the upward change to typical aeolian sandstones from typical fluvial sandstones, which are finer grained and better cemented. Geophysically the boundary is sharp, marked by an increase in sonic interval transit time and an increase in gamma-ray values.
has geographical distribution: West Cumbrian Coast, between Sellafield and Drigg/Ravenglass
has lithology description: Red brown, medium to coarse, generally poorly sorted well rounded sandstone, cross bedded. Onshore aeolian sandstones are dominant: offshore fluvial sandstones are dominant.
has thickness description: 469-529m in Sellafield boreholes
has upper boundary definition: Taken at the top of a thick (40-50m) fluvial sandstone unit that is well cemented and overlain by coarser, less well cemented aeolian sandstones (Ormskirk Sandstone Formation). The top is marked by a rapid decrease in gamma-ray values and an increase in sonic interval transit times.

Craigburn Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Corrie Sandstone And Brodick And Lamlash Beds (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CSBL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PU
has lithology component: CSBL BREC
has lithology component: CSBL SDST
broader: NE

Cascade Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CSC
has current status: CURRENT
has theme: BEDRCK
notation: CSC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41800
has lithology component: CSC CONG
has lithology component: CSC CSSST
has lithology component: CSC SDST
has source info: CSC_48694
has source info: CSC_50759
has source info: CSC_52760
has obsolete equivalent: CSC mn 817
has obsolete equivalent: CSC mn 816
broader: Ardwell Farm Formation
has lower boundary definition: Base of conglomerate, resting on flaggy sandstone.
has geographical distribution: Girvan area, Southwest Scotland.
has lithology description: A localised thick conglomerate unit at or near the top of the generally flaggy Ardwell Farm Formation. Thickly bedded. Grey-green and buff- to yellow-weathering grits with scattered pebbles and boulders up to 60cm across of dolerite, spilite, gabbro, granophyre, granite and olive green mudstone rafts in a slightly calcareous matrix.
has thickness description: To 200m
has upper boundary definition: Taken at the top of the conglomerate and return to flaggy sandstone.

Cromerian Complex Interglacial 2 To Saalian Channel Fill Deposits, Undifferentiated (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CSCFU
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BS
has lithology component: CSCFU SED
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Saalian.

Cowglen Sclutty Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: CSCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CSCO COAL
has lateral equivalent: CSCO st 503
broader: LSC

Cover Sand
type: Concept
in scheme: NamedRockUnit
alternative label: CSD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: CSD SANDU
broader: Aeolian Deposits
has lithology description: Sand and silt, commonly wind-blown (aeolian). [Generic description].

Cromerian Complex Interglacial 2 To Saalian Diamicton, Firm To Hard (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CSDFH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BS
has lithology component: CSDFH DMTN
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Saalian.

Colsterdale Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CSDL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CSDL LMST
broader: Colsterdale Marine Beds

Castledikes Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CSDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Corsend Gelifluctate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CSEND
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41802
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41803
has lithology component: CSEND DMTN
has source info: CSEND_49716
has source info: CSEND_50162
has source info: CSEND_50626
has source info: CSEND_50875
has source info: CSEND_50897
has source info: CSEND_51989
has source info: CSEND_52002
has source info: CSEND_52214
has source info: CSEND_52951
has obsolete equivalent: CSEND mn 1064
has obsolete equivalent: CSEND mn 2259
has obsolete equivalent: CSEND mn 2263
has obsolete equivalent: CSEND CSEND
has obsolete equivalent: CSEND mn 2255
has obsolete equivalent: CSEND mn 2260
is obsolete equivalent of: CSEND CSEND
broader: ROTIL
has additional age information: Devensian (??MIS 4 - 3).
has lower boundary definition: The lower boundary of the bed is a planar, subhorizontal erosion surface truncating weathered diamicton of the Fernieslack Palaeosol Bed/Rottenhill Till Formation.
has geographical distribution: Buchan, northeast Scotland. The bed is only known within the immediate vicinity of Kirkhill Quarry (infilled) (centred on NK 0120 5285) on Sheet 87W (Ellon).
has lithology description: Gravelly sandy silt diamicton. Crudely bedded, brown, matrix supported, non-calcareous. Clasts are typically angular to subangular. Clast lithologies are dominated by felsite with lesser amounts of quartzitic and psammitic metasediments, basic igneous rocks, red stained quartzites, red-brown sandstone, grey granite and pelitic metasediments. In thin section silt droplet fabrics have been recorded indicating incipient pedogenesis under cold climate conditions. A truncated ice-wedge cast has also been recorded descending from the upper surface of this deposit into the Rottenhill Till Formation beneath. Interpreted as a periglacial gelifluctate.
has thickness description: To 0.80m
has upper boundary definition: The upper boundary of the bed is a planar, subhorizontal erosion surface overlain either by black clayey diamicton of the Corse Diamicton Formation or brown diamicton of the Hythie Till Formation.

Canonbie Seven Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CSFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CSFC COAL
broader: MCMS

Castle Hill Flints
type: Concept
in scheme: NamedRockUnit
alternative label: CSFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Crossgates Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CSGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: PLCM

Caton Shale
type: Concept
in scheme: NamedRockUnit
alternative label: CSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CSh
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41805
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41807
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41806
has lithology component: CSH MDST
has lithology component: CSH SARCST
has source info: CSH_49288
has source info: CSH_49970
has source info: CSH_50498
has source info: CSH_51683
has source info: CSH_52911
has obsolete equivalent: CSH mn 824
has obsolete equivalent: CSH mn 826
has obsolete equivalent: CSH mn 825
is obsolete equivalent of: CSH SILS
broader: SILS
has lower boundary definition: Sharp boundary, with grey to blue-grey mudstone of the Caton Shale Member above fine-grained sandstone of the Ward's Stone Sandstone.
has geographical distribution: Lancaster Fells area.
has lithology description: Mudstone (claystone) grey to blue-grey, shaly, fossiliferous (bivalves and goniatites) with common calcite mudstone nodules and siderite-mudstone lenses in upper part.
has thickness description: 60-70m
has upper boundary definition: Sharp boundary at base of lowest sandstone in Claughton Member. Highest 1 or 2m of the Caton Shale typically silty, with Lingula.

Castlehead Coals
type: Concept
in scheme: NamedRockUnit
alternative label: CSHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CSHC COAL
broader: LWM

Castlehead Lower Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CSHL
has current status: CURRENT
has theme: BEDRCK
notation: CSHL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CSHL COAL
broader: LWM

Cushnie Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CSHN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Cairngorm Granitic Suite

Castlehead Upper Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CSHU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CSHU COAL
broader: LWM

Crofthead Slatyband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: CSI FEST
broader: PGP
has additional age information: The precise Age is uncertain, but the bed lies within the limits of Arnsbergian to Langsettian.

Canonbie Six Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CSIX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CSIX COAL
broader: NE

Cockleshell Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: CSL LMST
broader: Alston Formation

Cross Lane Limestones Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CSLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: JH
has youngest age: JH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41808
has lithology component: CSLL LMST
has lithology component: CSLL MDST
has source info: CSLL_49022
has source info: CSLL_49323
has source info: CSLL_50409
has source info: CSLL_50484
has obsolete equivalent: CSLL mn 1152
broader: Granby Member
has lower boundary definition: Change up from grey, calcareous mudstone of the undifferentiated Granby Member; at 76.26m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it may pass south into part of the more argillaceous and less bioclastic Rugby Limestone Member of the Blue Lias Formation (Ambrose, 2001).
has lithology description: Group of several (seven at type section) thin (typically 0.1m) limestone units separated by mudstone beds. The limestone beds are shelly, pale grey, weathering pale brown, with abundant coarse sand-grade shell debris. Fauna includes forams, serpulids, gastropods, bivalves and echinoderms. The lower part forms a positive feature.
has thickness description: 1.5 to 2m; 1.92m in type section.
has upper boundary definition: Change up into grey, calcareous mudstone of the undifferentiated Granby Member; at 76.34 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).

Castle Hill Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: CSMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Castle Hill Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: CSMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Castle Hill Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: CSMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: TACH

Cromerian Complex Interglacial 2 To Saalian Mud And Sand, Interbedded (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: CSMAS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BS
has lithology component: CSMAS MUD
has lithology component: CSMAS MUDM
has lithology component: CSMAS S
has lithology component: CSMAS SND
broader: NA
has additional age information: Cromerian Complex Interglacial 2 to Saalian.

Camas Malag Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CSMG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JH
has predominant age: JH
has youngest age: JH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41809
has lithology component: CSMG DOLO
has lithology component: CSMG LMST
has source info: CSMG_49057
has source info: CSMG_51141
has source info: CSMG_52367
has source info: CSMG_52638
has lateral equivalent: CSMG BRKH
broader: LI
has additional age information: Early Jurassic? uncertain to Hettangian?
has lower boundary definition: Unconformable on a palaeokarstic surface eroded into Ordovician dolostones of the Durness Group.
has geographical distribution: Sea of the Hebrides Basin
has lithology description: The limestone unit infills a pre-existing palaeokarstic surface and comprises clasts of Ordovician limestone (Durness Group), within an early Jurassic, yellowish, crinoid-rich, micrite matrix.
has thickness description: <1m
has upper boundary definition: Separated by a dolerite sill from overlying fissile mudstones and limestones of the Breakish Formation; Farris et al (1999) suggested that, apart from the sill, the sequence is conformable.

Cowglen Smithy Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: CSMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CSMI COAL
broader: LSC

Cape Shore Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CSO
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: CSO CLAY
has lithology component: CSO CLSH
has lithology component: CSO SICL
broader: NE
has lower boundary definition: Apparently conformable boundary with Ferder Formation within map area.
has geographical distribution: Not defined.
has lithology description: Soft to firm, highly to moderately silty clay with sporadic shell fragments and pebbles. Geotechnical strength lower than underlying Ferder Formation, also less sandy. Less pebbles/shells and more streaky and laminated in appearance than the overlying Sperus Formation.
has thickness description: 10 metres in Borehole 78/9 but thickens to 45 metres to the plateau edge and thicker in the northern part of the Norwegian Trench area.
has upper boundary definition: Top boundary unconformable with thin sand Holocene sedimentation at the sea bed, or apparently conformable with the overlying Sperus Formation.

Cloghfin Sponge Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CSP
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41811
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41812
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41810
has lithology component: CSP CHLK
has lithology component: CSP CONG
has lithology component: CSP LMST
has source info: CSP_51344
has source info: CSP_52106
has source info: CSP_52212
has source info: CSP_52915
has obsolete equivalent: CSP mn 3937
has obsolete equivalent: CSP mn 967
has obsolete equivalent: CSP mn 3938
broader: NE
has additional age information: Santonian. Uintacrinus socialis Zone in part.
has lower boundary definition: Everywhere the base rests unconformably upon eroded Hibernian Greensand Group successions. In the most complete Hibernian Greensands Formation sequences (Kilcoan [J461 985]) the base of the Clochfin Sponge Formation is 4.27m above the conspicuous `Inoceramus Bands?.
has geographical distribution: Limited to the East Antrim Basin Northern Ireland.
has lithology description: Chalk and chalk conglomerate/breccia, glauconitic, with conspicuous hexactinellid sponge psuedomorphs. Three separate beds recognised (A, B, C) each with characteristic shape-variants of the irregular echinoid Echinocorys.
has thickness description: As defined in the type-site the beds are 1.47m thick.
has upper boundary definition: The exact relationship with the overlying Galboly Chalk Formation is not certain (Fletcher, 1978 p. 8 para. 2). It is taken a well-developed separation plane below which the beds contain arenaceous `contamination?.

Corrie Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CSS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has lithology component: CSS SDST
broader: NE

Camps Shale
type: Concept
in scheme: NamedRockUnit
alternative label: CSSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CSSH SAPEL
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Cross Slieve Group
type: Concept
in scheme: NamedRockUnit
alternative label: CSSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
broader: NE
narrower: Ballyagen Formation
narrower: Cushendun Formation
narrower: Cushendall Formation

Central Monzogranite Facies, Starav Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CSTAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CSTAR GNL
has obsolete equivalent: CSTAR mn 854
broader: STRAV

Central Scotland Late Carboniferous Tholeiitic Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: CSTD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: CU
has youngest age: CU
has lithology component: CSTD BA
has lithology component: CSTD CAMPTN
has lithology component: CSTD DOLR
has lithology component: CSTD MCGB
has lithology component: CSTD MCGBR
has lithology component: CSTD MCOLGB
has lithology component: CSTD MCQGB
has lithology component: CSTD MONCHQ
has lithology component: CSTD OLBA
broader: LCTS
narrower: Campsie Dyke
narrower: MDOCK
narrower: MILND
narrower: PRLO
narrower: KELH
narrower: PRSE
narrower: PSSP
narrower: LZTOR
narrower: Claddens Dyke

Cowglen Stinking Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: CSTI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CSTI COAL
has lateral equivalent: CSTI st 351
broader: LSC

Cronk Sumark Slate
type: Concept
in scheme: NamedRockUnit
alternative label: CSU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
broader: NE

Clennery Scar Vein
type: Concept
in scheme: NamedRockUnit
alternative label: CSV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41813
has source info: CSV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Ceiswyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CSW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41815
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41814
has lithology component: CSW SDST
has lithology component: CSW SLMDST
has lithology component: CSW SLST
has lithology component: CSW TUF
has source info: CSW_49215
has source info: CSW_49283
has source info: CSW_49835
has source info: CSW_49973
has source info: CSW_51180
has obsolete equivalent: CSW mn 842
has obsolete equivalent: CSW mn 843
has obsolete equivalent: CSW mn 3001
has obsolete equivalent: CSW mn 4099
has obsolete equivalent: CSW mn 71
broader: OGW
narrower: Cefn Gwyn Tuff
narrower: Frondderw Tuff Member
narrower: Glyn Gower Siltstones Member
narrower: Craig Hen-Gae Member
narrower: Derfel Limestone Member
has lower boundary definition: Formation is underlain by volcanic rocks of the Craig-y-Llam Formation. Boundary placed at top of air fall tuffs or bedded tuffaceous mudstones. Abrupt transition from volcanic rocks to mudstones but contact appears conformable.
has geographical distribution: Occupies the central part of Sheet 149. Passes west into Cardigan Bay and east into a group of distinguishable rock units collectively termed the "Lower Bala Group" (Bassett, and others, 1966. Quarterly Journal of the Geological Society, Vol.122).
has lithology description: Interbedded silty-mudstones and siltstones with subordinate sandstones and tuffs. Anoxic mudstones common in upper part. Disturbables occur throughout formation, but are more common in lower part.
has thickness description: Approximately 1400m in type locality area. Exceeds 1550m at western end of outcrop.
has upper boundary definition: Formation is overlain by anoxic, black, graptolitic mudstone of the Nod Glas Formation with little or no siltstone or sandstone content. The boundary is conformable/transitional over 1.5m and is marked by the disappearance of mudstone turbidites of the Ceiswyn Formation.

Chee Tor Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CT
has current status: CURRENT
has theme: BEDRCK
notation: CT
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41816
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41818
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41819
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41817
has lithology component: CT LMST
has source info: CT_49236
has source info: CT_50674
has source info: CT_52767
has source info: CT_52985
has obsolete equivalent: CT mn 890
has obsolete equivalent: CT mn 891
broader: Bee Low Limestone Formation
has lower boundary definition: Taken at the conformable transition from the top of the highest dark micritic or calcilutitic bed of the Woo Dale Limestone Formation to the pale grey to grey calcarenite with rare calcilutites or very fine calcarenites of the Chee Tor Limestone Member.
has geographical distribution: Positive identification of rocks assigned to the Member is restricted to the area around Buxton and the valley of the River Wye.
has lithology description: A homogeneous, massive to thickly bedded, pale grey to grey calcarenite. Bed boundaries are typically defined by stylolitic or clay partings, with beds generally ranging from 0.5 to 5.0m, up to a maximum of 10.2m thick. Rare calcilutites or very fine calcarenites occur in the basal 13m, where beds tend to be thinner.
has thickness description: Average thickness is 120m
has upper boundary definition: Calcarenites of the Chee Tor Limestone Member are overlain by basaltic lavas of the Lower Miller's Dale Lava Member.

Clattering Band
type: Concept
in scheme: NamedRockUnit
alternative label: CTB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CTB LMST
has lateral equivalent: CTB KBL
broader: TYLS

Castell Coch Limestone [Duplicate Code: Use Ccl]
type: Concept
in scheme: NamedRockUnit
alternative label: CTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: Avon Group

Claret Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: CTCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41820
has lithology component: CTCL C
has lithology component: CTCL S
has lithology component: CTCL Z
has source info: CTCL_49343
has source info: CTCL_51040
has source info: CTCL_52314
has source info: CTCL_52678
has lateral equivalent: CTCL st 170
has obsolete equivalent: CTCL mn 927
broader: Carse Clay Formation
has additional age information: Mid to late Holocene.
has lower boundary definition: Unconformable, on older Holocene and late Devensian units including the Bothkennar Gravel Member and the Wilderness Till Formation. Locally the Carse of Stirling Clay Member passes transitionally upwards into the Claret Clay Member in the Alloa-Grangemouth area of the Forth estuary.
has geographical distribution: Lower Forth valley from Stirling eastwards to near the Forth estuary in the Falkirk area; area of the estuarine deposits of the Lower Post Glacial Shorelines and associated raised beach surfaces.
has lithology description: Clayey silt and silty clay, finely laminated and crudely stratified with silt and very fine- to medium-, sometimes coarse-grained sand; grey, black and brownish grey, finely micaceous, sulphur-rich, contains shells and shell fragments, and vivianite grains. Massive where bioturbated. These are deposits of an estuarine tidal flat complex formed after the time of highest Holocene sea level (Main Post-Glacial Shoreline).
has thickness description: Veneer to perhaps as much as 18m
has upper boundary definition: Upper boundary mainly at surface or overlain unconformably by modern alluvial deposits, eg, Grangemouth Silt Member.

Caister Coal Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CTCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
broader: Conybeare Group

Tournaisian And Visean Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CTCVU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CV
broader: NA

Camnant Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CTE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cte
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41821
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41822
has lithology component: CTE MDST
has lithology component: CTE SDST
has obsolete equivalent: CTE mn 766
broader: NP
narrower: Bettws Mill Tuff Member
narrower: Gelli Tuff Member
has lower boundary definition: Not seen.
has geographical distribution: North limit: Careg Wiber Bank, but inliers on Cwm-Brith and Castle Banks.
has lithology description: Mudstone with upwards increasing frequency of sandstone and conglomeratic sandstone interbeds in upper part of formation.
has thickness description: Not defined.
has upper boundary definition: Gradational.

Chert Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
is obsolete equivalent of: CTF BPLM
is obsolete equivalent of: CTF BPM
broader: NE

Canonbie Three Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CTFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CTFC COAL
broader: MCMS

Coniston Group
type: Concept
in scheme: NamedRockUnit
alternative label: CTG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CTG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
has lithology component: CTG MDST
has lithology component: CTG SDST
has lithology component: CTG SLST
has source info: CTG_49249
has source info: CTG_51300
has source info: CTG_51423
has source info: CTG_52056
has source info: CTG_52681
has lateral equivalent: CTG st 208
has obsolete equivalent: CTG mn 1029
has obsolete equivalent: CTG mn 1030
broader: WIN
narrower: NEI
narrower: MHO
narrower: HNF
narrower: Gawthwaite Formation
narrower: YBK
narrower: PSR
narrower: SGI
narrower: LRG
has lower boundary definition: Conformably overlies the Wray Castle Formation.
has geographical distribution: Southern Lake District and north-west Pennines.
has lithology description: Sandstone, siltstone and laminated hemipelagite. NOTE: All component parts have individually defined type sections or areas. These cover the entire group: see Yewbank, Moorhowe, Poolscar, Latrigg and Gawthaite formations.
has thickness description: 1400-1900m.
has upper boundary definition: Conformably overlain by the Bannisdale Formation.

Cat Gill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CTGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CTGL LMST
has source info: CTGL_51867
has lateral equivalent: CTGL DRL
has lateral equivalent: CTGL st 646
broader: NE
has geographical distribution: Clitheroe area, Lancashire.
has lithology description: Well-bedded pale grey, fine-grained cherty limestone.
has thickness description: c.3m to c.18m

Cairn Trench Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CTGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: CTGR GN
has lithology component: CTGR PEG
broader: NEGRA

Causeway Tholeiite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CTH
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Churwell Thin Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CTHN
has current status: CURRENT
has theme: BEDRCK
notation: CN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CTHN COAL
broader: PLCM
has lithology description: The Churwell Thin Coal is a widespread bituminous seam, usually thin but of economic importance in the area of Farnley and Churwell. It coalesces with the Churwell Thick to form the Beeston Seam (Green et al, 1878).

Cumnock Thirty Inch Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CTIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CTIC COAL
broader: MCMS

Carn Teikever Granite
type: Concept
in scheme: NamedRockUnit
alternative label: CTK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CTK GNB
broader: NE

Churwell Thick Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CTKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CTKC COAL
broader: PLCM
has lithology description: The Churwell Thick Coal occurs as an independent seam only in the area of Churwell. Farther west the seam splits into the Shertcliffe Coal and the Little Coal

Cookstown Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CTL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Cotham Member
type: Concept
in scheme: NamedRockUnit
alternative label: CTM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ctm
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: TR
has youngest age: TR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41823
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41824
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41825
has lithology component: CTM CAMDST
has lithology component: CTM MDST
has lithology component: CTM SDST
has lithology component: CTM SLST
has source info: CTM_48671
has source info: CTM_51798
has obsolete equivalent: CTM mn 1081
broader: LTK
has lower boundary definition: Placed at sharp, commonly channelled base, resting on underlying Westbury Formation.
has geographical distribution: Present throughout England.
has lithology description: Grey and grey-green calcareous mudstones and shales and laminated and lenticular calcareous siltstones with beds of coarse-grained oolitic sandstone.
has thickness description: 1-2m
has upper boundary definition: Placed at base of porcellanous limestones of overlying Langport Member.

Catton Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CTNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CTNC COAL
broader: NE

Castletown Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CTNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: CTNL LMOOL
has lithology component: CTNL LMST
has lithology component: CTNL MDST
broader: Great Scar Limestone Group
narrower: STH
has geographical distribution: Southern part of the Isle of Man, around Castletown.
has lithology description: Boiclastic limestones and shaly mudstones with some ooidal limestones.

Clicker Tor Picrite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CTPI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: CTPI PCT
broader: NE
has lithology description: Augite-picrite with 60% serpentinized olivine, 30% poikilitic and interstitial augite and subordinate hornblende.

Chester's Quarry Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CTRQY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: CTRQY BSN
broader: LAFAS

Church Bay Tuffs And Skerries Grits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CTSG
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
broader: NNH

Cautley Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CTV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CtV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OW
has predominant age: OW
has youngest age: OW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41826
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41827
has lithology component: CTV RYTUF
has source info: CTV_48992
has source info: CTV_50137
has obsolete equivalent: CTV mn 828
has obsolete equivalent: CTV mn 829
broader: Cautley Mudstone Formation
has lower boundary definition: Taken at the base of the lowest bed of volcaniclastic rock overlying grey flaggy mudstone of the main part of the Cautley Mudstone Formation.
has geographical distribution: Restricted to the Cautley and Dent districts of Cumbria
has lithology description: Silicic tuffs, buff to pink in colour; thickly bedded at base becoming finer grained and thinly bedded at top
has thickness description: Up to 24m
has upper boundary definition: Passes up into grey splintery mudstone of the Cautley Mudstone Formation.

Culm Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: CU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41828
has lithology component: CU BALAVA
has lithology component: CU BATUF
has lithology component: CU CHRT
has lithology component: CU COAL
has lithology component: CU CONG
has lithology component: CU LMST
has lithology component: CU MDST
has lithology component: CU SDST
has lithology component: CU SLST
has source info: CU_48818
has source info: CU_50238
has obsolete equivalent: CU mn 1180
has obsolete equivalent: CU mn 1181
has obsolete equivalent: CU mn 1182
broader: NA
narrower: HOWY
narrower: LAQU
narrower: TEVY
narrower: Chudleigh Group
has lower boundary definition: In north Devon and west Somerset, the lower boundary is taken at the incoming of black, locally siliceous mudstones of the Culm Supergroup (Teign Valley Group) above the soft mid to dark grey mudstones with scattered very thin fossiliferous limestones, siltstones and sandstones of the underlying Exmoor Group (Pilton Mudstone Formation), In south Devon, it is taken at the incoming of black, locally siliceous mudstones of the Culm Supergroup (Teign Valley Group) above the olive green and pale grey mudstones of the Trusham Mudstone Formation. Elsewhere in the south the base is thrust out.
has geographical distribution: Devon, north and east Cornwall and west Somerset, southwest England.
has lithology description: The lower part predominantly comprises euxinic black mudstones, bedded cherts, siliceous mudstones, thin limestones and local basaltic tuffs and lavas. Local shallow water quartzites, greenish mudstones and limestones and dark grey mudstones with thin sandstones are developed in the south. There are local small-scale turbidite systems comprising interbedded sandstones, conglomerates and mudstones or interbedded limestones and mudstones. The upper part comprises large scale turbidite and delta systems of thin- to thick-bedded sandstone, siltstones and mudstones. The delta systems contain rare thin coals.
has thickness description: 3600 to 4750m
has upper boundary definition: Not seen.

Cumnock Claud Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CUC COAL
broader: MCMS

Culver Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CCk
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41829
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41830
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41831
has lithology component: CUCK CAMDST
has lithology component: CUCK CHLK
has lithology component: CUCK FLNT
has source info: CUCK_50539
has source info: CUCK_50818
has source info: CUCK_52006
has obsolete equivalent: CUCK mn 1184
broader: WHCK
narrower: SPCH
narrower: TACH
has additional age information: Campanian. Gonioteuthis quadrata Zone.
has lower boundary definition: Conformable. As defined in Mortimore (1986), the base of the Culver Chalk lies low in the quadrata Zone, at the Castle Hill Marl. Strong marls commonly occur for several metres above the Castle Hill Marls, up to and including the Pepper Box Marls which are now taken as the base.
has geographical distribution: Limited to Sussex, Hampshire Wiltshire and Dorset and as widely spaced outliers to the north in the Southern Province. It occurrence and distribution beneath the Quaternary deposits of East Anglia in the Transitional Province is not well known.
has lithology description: Soft white chalk, relatively marl free with flint seams. Flints are generally large and in the upper part tabular.
has thickness description: 65 to 75m and exceptionally 90m but can be significantly less where synsedimentary channelling occurs.
has upper boundary definition: Conformable at the Portsdown Marl (Mortimore, 1986).

Cuckoo Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: CUCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CUCO COAL
broader: NE

Cullaidh Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cud
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41832
has lithology component: CUD MDST
has lithology component: CUD SAPEL
has source info: CUD_49488
has source info: CUD_49569
has obsolete equivalent: CUD mn 3123
broader: Great Estuarine Group
has additional age information: Upper Bajocian to Late Bathonian.
has lower boundary definition: Marine to brackish water transition reflected in minor lithology changes from siltstone/sandstone to mudstone.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Brackish-lagoonal fissile mudstones, commonly with oil-shale at the base and fissile mudstones, commonly bioturbated.
has thickness description: 4 to 6m
has upper boundary definition: Lithology change to mudstones and sandstones of the Elgol Formation.

Garantiana Mudstone Member And Cullaidh Shale Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CUDGM
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: NA

Cudworth Coal (Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUDW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CUDW COAL
broader: NE

Cumnock Ell Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CUE COAL
broader: MCMS

Currarie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CUF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41833
has lithology component: CUF CHRT
has lithology component: CUF LAVA
has lithology component: CUF MDST
has lithology component: CUF VCBR
has source info: CUF_52489
broader: TAP
has lower boundary definition: Lowest occurrence of slumped heterogenous association of the same or all the above lithologies.
has geographical distribution: Not defined.
has lithology description: Heterogeneous association of red silicious mudstone locally with cherty bands, containing in places, slumped blocks of pillow lava. Also lava breccia, greenish grey mudstone, grey-green cherts.
has thickness description: 100m+
has upper boundary definition: The upper limit is the apparent occurrence of the same.

Cumnock Fifty Fathom Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUFI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUFI COAL
broader: LCMS

Cuckmere Flint
type: Concept
in scheme: NamedRockUnit
alternative label: CUFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
broader: SECK

Cumnock Forty Fathom Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUFO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUFO COAL
broader: LCMS

Outer Gabbros, A1 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIA1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIA1 OLGB
broader: Outer Gabbros (Cuillin Centre)

Outer Gabbros, A2 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIA2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIA2 OLGB
broader: Outer Gabbros (Cuillin Centre)

Outer Gabbros, A3 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIA3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIA3 GB
broader: Outer Gabbros (Cuillin Centre)

Outer Bytownite Troctolites, B1 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIB1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIB1 MCGB
broader: Outer Bytownite Troctolites (Cuillin Centre)

Outer Bytownite Troctolites, B2 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIB2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIB2 TRCTBY
broader: Outer Bytownite Troctolites (Cuillin Centre)

Outer Bytownite Troctolites, B3 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIB3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIB3 TRCTBY
broader: Outer Bytownite Troctolites (Cuillin Centre)

Cuillin Centre (Skye Central Complex)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: CE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIL IBREC
has lithology component: CUIL TUFIST
has lithology component: CUIL VCBR
broader: SKYC
narrower: Outer Gabbros (Cuillin Centre)
narrower: Outer Bytownite Troctolites (Cuillin Centre)
narrower: Outer Bytownite Gabbros (Cuillin Centre: Unit C)
narrower: Inner Cross-Cutting Bytownite Gabbro (Cuillin Centre: Unit D)
narrower: Inner Bytownite Troctolites (Cuillin Centre: Unit E)
narrower: Inner Gabbros (Cuillin Centre: Unit F)
narrower: Layered Peridotites (Cuillin Centre)
narrower: Coire Uaigneich Granite (Cuillin Centre)

Outer Bytownite Gabbros, Phase 1 (Cuillin Centre: Unit C)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIL1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIL1 GB
broader: NE

Outer Bytownite Gabbros, Phase 2 (Cuillin Centre: Unit C)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIL2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIL2 GB
broader: Outer Bytownite Gabbros (Cuillin Centre: Unit C)

Outer Bytownite Gabbros, Phase 3 (Cuillin Centre: Unit C)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIL3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIL3 GBBY
broader: Outer Bytownite Gabbros (Cuillin Centre: Unit C)

Outer Gabbros (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILA GB
has lithology component: CUILA OLGB
broader: Cuillin Centre (Skye Central Complex)
narrower: Outer Gabbros, A1 (Cuillin Centre)
narrower: Outer Gabbros, A2 (Cuillin Centre)
narrower: Outer Gabbros, A3 (Cuillin Centre)

Outer Bytownite Troctolites (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILB MCGB
has lithology component: CUILB TRCTBY
broader: Cuillin Centre (Skye Central Complex)
narrower: Outer Bytownite Troctolites, B1 (Cuillin Centre)
narrower: Outer Bytownite Troctolites, B2 (Cuillin Centre)
narrower: Outer Bytownite Troctolites, B3 (Cuillin Centre)

Outer Bytownite Gabbros (Cuillin Centre: Unit C)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILC GBBY
broader: Cuillin Centre (Skye Central Complex)
narrower: Outer Bytownite Gabbros, Phase 2 (Cuillin Centre: Unit C)
narrower: Outer Bytownite Gabbros, Phase 3 (Cuillin Centre: Unit C)

Inner Cross-Cutting Bytownite Gabbro (Cuillin Centre: Unit D)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILD GBBY
broader: Cuillin Centre (Skye Central Complex)

Inner Bytownite Troctolites (Cuillin Centre: Unit E)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILE TRCTBY
broader: Cuillin Centre (Skye Central Complex)

Inner Gabbros (Cuillin Centre: Unit F)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILF
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILF GB
broader: Cuillin Centre (Skye Central Complex)

Layered Peridotites (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILP PDT
has lithology component: CUILP TRCTBY
broader: Cuillin Centre (Skye Central Complex)
narrower: Layered Peridotites, P1
narrower: Layered Peridotites, P2 (Cuillin Centre)
narrower: Layered Peridotites, P3 (Cuillin Centre)
narrower: Layered Peridotites, P5 (Cuillin Centre)
narrower: Layered Peridotites, P6 (Cuillin Centre)

Coire Uaigneich Granite (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUILU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUILU GNGP
broader: Cuillin Centre (Skye Central Complex)

Layered Peridotites, P1
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP1 DUN
broader: Layered Peridotites (Cuillin Centre)

Layered Peridotites, P2 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP2 PDT
has lithology component: CUIP2 TRCTBY
broader: Layered Peridotites (Cuillin Centre)

Layered Peridotites, P3 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP3 PDT
has lithology component: CUIP3 TRCTBY
broader: Layered Peridotites (Cuillin Centre)

Layered Peridotites, P4 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP4
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP4 PDT
has lithology component: CUIP4 TRCTBY
broader: NE

Layered Peridotites, P5 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP5
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP5 PDT
has lithology component: CUIP5 TRCTBY
broader: Layered Peridotites (Cuillin Centre)

Layered Peridotites, P6 (Cuillin Centre)
type: Concept
in scheme: NamedRockUnit
alternative label: CUIP6
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: CUIP6 PDT
has lithology component: CUIP6 TRCTBY
broader: Layered Peridotites (Cuillin Centre)

Cushat Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CUL LMST
has lateral equivalent: CUL LTLS
broader: SMGP
has lithology description: Upper bed is dark, crinoidal limestone overlying dark shaly grit in turn overlying crinoidal grit.
has thickness description: Two beds each about 0.3m thick separated by c.0.7m of dark shaly mudstone.

Cumnock Low Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CULE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CULE COAL
broader: MCMS

Cullardoch Diorite
type: Concept
in scheme: NamedRockUnit
alternative label: CULL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: CULL DI
broader: SSCGR

Culnagrew Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CULS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has lithology component: CULS SDST
broader: MMG

Culvennan Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: CULV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CULV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41834
has lithology component: CULV DI
has lithology component: CULV GN
has lithology component: CULV PXBDI
has lithology component: CULV PYRBRC
has lithology component: CULV TO
has source info: CULV_49520
has source info: CULV_50100
has source info: CULV_51167
broader: Galloway Granitic Suite
has lower boundary definition: Intrusive contact.
has geographical distribution: Kirkcowan area, southwest Scotland.
has lithology description: Minor pluton of pyroxene diorite, with two small subsidiary outcrops (each c. 200m diameter) to the south of the main body. An associated breccia-filled vent lies about 0.5km to the west of the main body.
has thickness description: Elongated body c. 2km x 0.7km, with long axis orientated c. 075 degrees
has upper boundary definition: Intrusive contact.

Cumnock Major Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CUM COAL
broader: MCMS

Cove Upper Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CUMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CUMB CAMDST
has lithology component: CUMB LMST
has source info: CUMB_49535
has source info: CUMB_51076
has lateral equivalent: CUMB st 217
broader: SYG
has geographical distribution: Type locality is at Cove Harbour, near Cockburnspath, Berwickshire.
has lithology description: Impure sandy limestones, locally crinoidal, and calcareous shales.
has supplementary information: Also known as Cove Upper Limestone. Formerly included within the "Calciferous Sandstone Group/Measures/Series". Correlated with the Linkhead Limestone and the Woodend Limestone.
has thickness description: c.0.45 to 1.8m

Main Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: CUMN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CUMN COAL
broader: PMCM

Cumnock Musselband Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUMU COAL
broader: LCMS

Cucklington Oolite Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CkO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41835
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41836
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41837
has lithology component: CUO CAMDST
has lithology component: CUO LMOOL
has lithology component: CUO LMST
has source info: CUO_49329
has source info: CUO_50910
has source info: CUO_51849
has source info: CUO_52116
has source info: CUO_52956
has obsolete equivalent: CUO mn 2383
broader: STOU
has lower boundary definition: Fairly abrupt change from oolitic, grey clay, to shelly limestones.
has geographical distribution: Most of the way across the Shaftesbury Sheet (313) and across the southern part of the Wincanton Sheet (297).
has lithology description: Shelly, locally sandy, oosparite; lower beds commonly micritic, with interbeds of oolitic marl.
has thickness description: 2 - 5m (2.73m in the type quarry; 3.86m in the East Stour Borehole - ST82SW/9).
has upper boundary definition: Fairly abrupt change from limestone to mudstone, locally oolitic, of the Hinton St. Mary Clay. Where the Hinton St. Mary Clay is absent, the limestones pass up fairly abruptly into the Sturminster Pisolite.

Cushendall Porphyry
type: Concept
in scheme: NamedRockUnit
alternative label: CUPY
has current status: CURRENT
has theme: BEDRCK
notation: CUPY
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
broader: NE

Cullen Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41838
has lithology component: CUQU PSAMM
has lithology component: CUQU QZITE
has source info: CUQU_48670
has source info: CUQU_49235
has source info: CUQU_50436
has source info: CUQU_52017
has obsolete equivalent: CUQU mn 1179
broader: Grampian Group
narrower: Bellyhack Quartzite Member
narrower: Dicky Hare Semipelite Member
narrower: SUNS
narrower: Ben Algan Quartzite Member
narrower: LOGQ
narrower: Findochty Quartzite Member
has lower boundary definition: Base of thick-bedded quartzites (not seen in any of the exposures).
has geographical distribution: 1) Coast between Buckie and Cullen, inland to Hill of Maud (Sheets 95 and 96). 2) Ben Aigan, Craigellachie to Cairnty (Sheet 85E). 3) Core of Ardonald Anticline, from Jock's Hill to Hill of Shenwall (Sheet 85E).
has lithology description: Pale quartzites, mostly pure; thickly bedded with trough cross-bedding and large channel fills, to flaggy and more planar bedded.
has thickness description: c. 2,400m on coast, c. 1,250m seen inland
has upper boundary definition: At top of flaggy quartzites where overlain by flaggy micaceous psammites and semipelites of the Findlater Flag Formation.

Curdly Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CUR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CUR FEST
broader: PGP

Curving Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CURV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CURV COAL
broader: SWLCM

Cullivait Silts Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUS
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41840
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41839
has lithology component: CUS CZ
has lithology component: CUS L
has lithology component: CUS S
has lithology component: CUS Z
has source info: CUS_51496
has source info: CUS_52698
broader: ISCG
has lower boundary definition: Either overlies Bedrock or red-brown diamicton of the Gretna Till Formation. Base of unit is not exposed at the Partial Type Section.
has geographical distribution: Northern margin of the Solway Firth, principally between Dumfries and Gretna, but extending inland to Dalswinton and Canonbie. These deposits also occur concealed beneath the alluvial sediments of the River Esk between Gretna and Carlisle.
has landform description: Glaciolacustrine deposits infilling basins and hollows associated with glaciofluvial outwash deposited during Late Devensian deglaciation.
has lithogenesis description: Glaciofluvial Deposits; in some instances dropstones indicate deposition in ice-dammed lakes.
has lithology description: Interbedded silty clay, sandy silt, and silty sand, forming upward coarsening flat-lying units; generally moderate reddish brown to brown or greyish brown. Sandy silts and silty clays are typically thinly bedded in finely-laminated to massive beds; silty sands display planar lamination, ripple lamination and small-scale tabular cross-bedding. Rounded greywacke dropstone cobbles disrupt the lamination in silt and clay units at the Partial Type Section.
has thickness description: Typically 3-5m, but >10m proved in boreholes south of Canonbie.
has upper boundary definition: Taken at the base of the Kilblane Sand and Gravel Formation at the Partial Type Section; overlain by red-brown diamicton of the Gretna Till Formation in the Reference Section.

Culfargie Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUSA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41841
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41842
has lithology component: CUSA C
has lithology component: CUSA S
has lithology component: CUSA V
has lithology component: CUSA Z
has source info: CUSA_49192
has source info: CUSA_51280
has obsolete equivalent: CUSA mn 1178
broader: Forth Clay Formation
has additional age information: Windermere Interstadial.
has lower boundary definition: Diachronous transitional base with, and passing laterally into, the Powgavie Clay (Forth Clay Formation), and also the Errol Clay Formation.
has geographical distribution: River Tay just northwest of Perth, River Earn from Dunning eastwards and adjacent to the Tay/Earn estuary.
has lithology description: Typically deltaic and estuarine, commonly very fine- to medium-grained, finely micaceous, mainly flat laminated grey sand with silt and some clay laminae. Scattered pebbles occur up to 2cm size along with rare pebble beds, and there are black sulphidic patches. Coarser deposits including much higher proportions of coarse sand and gravel beds are known in the western areas of occurrence.
has thickness description: 35m known at Culfargie.
has upper boundary definition: The Culfargie Sand Member has a complex upper boundary with multiple unconformities with younger strata including the Carey Silt Member, Kingston Sand Member and Carse of Gowrie Clay Member (Carse Clay Formation). Also is known at surface as the top deposit of later Devensian raised beach landforms.

Culham Sands With Cherts Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Seventeen Fathom Coal (Cumnock; South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUSF COAL
broader: LCMS

Cushendun Granodiorite
type: Concept
in scheme: NamedRockUnit
alternative label: CUSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: CUSH GD
broader: NE

Cutcombe Slates Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: IFS
narrower: ROL

Culchavie Striped Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CUST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41843
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41844
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41845
has lithology component: CUST PSAMM
has lithology component: CUST SEMPEL
has source info: CUST_49233
broader: Easdale Subgroup
narrower: Caochandye Quartzite Member
narrower: Coulins Burn Striped Member
narrower: Coralea Phyllite Member
has lower boundary definition: Rapid transition from quartzite of the underlying Kymah Quartzite Formation to striped semipelite - psammite unit.
has geographical distribution: c. 1km south of Cook's Cairn in the Blackwater Forest, and from the Allt na Craoibhe - Caorainn south to the Head of Glen Buchat, the Peat Hill, and SSE to Glen Conrie and Upper Glenfenzie (Sheet 75E). Also around summit of Carn Oighreag, on Hill of Allargue. On Sheet 75W stretches SSE from Reidh Dorch, across the Muckle Fergie Burn to Cairn Culchavie (Upper Donside) and Cairn Sawvie, where it is cut by the Glen Gairn Granite.
has lithology description: Notably striped, semipelites and psammites, laminated and thinly banded, slaty to schistose. Psammites more quartzose and abundant near the base of the formation. Semipelites dominate towards the top.
has thickness description: 285 - 1200m
has upper boundary definition: Upper limit of semipelite at base of graphitic pelite of the Glenbuchat Graphitic Schist Formation.

Cumnock Three Dirt Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUTD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CUTD COAL
broader: MCMS

Twenty Fathom Coal (Cumnock; South Ayrshiore)
type: Concept
in scheme: NamedRockUnit
alternative label: CUTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUTF COAL
broader: LCMS

Culdoich Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUTI
has current status: CURRENT
has theme: SPRFCL
notation: CULT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41846
has lithology component: CUTI CLAY
has lithology component: CUTI DMTN
has lithology component: CUTI GRAV
has lithology component: CUTI SANDU
has source info: CUTI_50681
has source info: CUTI_50803
has source info: CUTI_50861
has source info: CUTI_51294
has source info: CUTI_52782
has obsolete equivalent: CUTI mn 936
broader: Clava Shelly Formation
has lower boundary definition: Sharp, unconformable or glacitectonic boundary with either bedrock or the Cassie Till Formation.
has geographical distribution: Sheet NH74SE.
has lithology description: Pebbly silty clay diamicton containing shell fragments of high-boreal to low-arctic aspect, clasts typically well rounded, high sphericity.
has thickness description: 2.5m at type section.
has upper boundary definition: Sharp, unconformable, glacitectonic boundary with the Dalroy Sand Member.

Cuthill Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CUTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41847
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41848
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41849
has lithology component: CUTL MLMST
has lithology component: CUTL MSDR
has source info: CUTL_48669
has obsolete equivalent: CUTL mn 2150
broader: KTHL
has lower boundary definition: Base of massive, banded crystalline limestone in semipelites of the Keith Limestone Formation.
has geographical distribution: Keith area, Braehead (85E) to Drum (86W), and Muldearie (85E).
has lithology description: Metalimestone, mid-grey, colour-banded, generally massive but with many open joints and cavities.
has thickness description: 28m proved in boreholes.
has upper boundary definition: Top of massive, banded, crystalline limestone overlain by semipelites with thin beds of quartzite and calc-silicate rock (Keith Limestone Formation).

Cumberworth Thin Coal (South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUTN
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUTN COAL
has lateral equivalent: CUTN st 237
broader: PLCM

Thirty Six Fathom Coal (Cumnock; South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CUTS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CUTS COAL
broader: LCMS

Cademan Volcanic Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: CVB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CVB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41851
has lithology component: CVB VCBR
has source info: CVB_50921
has source info: CVB_51833
has obsolete equivalent: CVB WVO
broader: Charnwood Lodge Volcanic Formation
has lower boundary definition: Not seen, but mapping shows unit to be spatially associated with the Grimley Andesite, with which it may in part be gradational.
has geographical distribution: North-western Charnwood Forest, between High Cademan and Grace Dieu Wood.
has lithology description: Massive volcanic block-breccia comprising angular to sub-rounded andesitic to dacitic blocks in a crystal-lapilli matrix.
has thickness description: 0-450m
has upper boundary definition: Not seen, but mapping shows unit to be spatially associated with the Grimley Andesite, with which it may in part be gradational.

Clovelly Court Shales
type: Concept
in scheme: NamedRockUnit
alternative label: CVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
broader: NE

Carvichen Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CVCH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEGRA

Catshole Vein Coal (Pembrokeshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CVCO
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: CVCO COAL
broader: NE

Colne Valley Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: CVD
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: CVD GRAV
has lithology component: CVD SANDU
broader: NE
has lithology description: Gravel, sand, silt and clay, with organic-rich interbeds. [Generic description: academic papers and BGS Memoirs].

Crawton Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CVF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CVF
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41852
has lithology component: CVF AND
has lithology component: CVF BA
has lithology component: CVF CONG
has lithology component: CVF SDST
has lithology component: CVF TRAND
has lithology component: CVF TUF
has source info: CVF_48869
has source info: CVF_51673
has source info: CVF_51981
broader: Dunnottar-Crawton Group
narrower: LNP
has lower boundary definition: The base of the lowest lava or tuff overlying the Whitehouse Conglomerate Formation or the Gourdon Sandstone Formation.
has geographical distribution: Stonehaven to Gourdon, and in the north-west limb of the Strathmore Syncline between Stonehaven and Dunkeld.
has lithology description: Macroporphyritic shoshonite lavas, aphyric and microporphyritic olivine basalt and basaltic andesite lavas, tuffs and volcaniclastic sedimentary rocks.
has thickness description: Up to 270 m thick.
has upper boundary definition: The top of the lava or tuff underlying the Catterline Conglomerate Formation.

Clogher Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CVG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CV
has lithology component: CVG LMST
has lithology component: CVG MDST
broader: NE

Cove Harbour Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CVHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CVHS SAMDST
has lithology component: CVHS SDST
broader: SYG
has geographical distribution: Type locality is at Cove Harbour, near Cockburnspath, Berwickshire.
has lithology description: Yellow and reddish massive coarse-grained false-bedded sandstone with abundant lenticles of red and buff sandy shale.
has supplementary information: Formerly included within the "Calciferous Sandstone Group/Measures/Series".
has thickness description: c.26m

Cove Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CVLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41853
has lithology component: CVLS LMST
has lithology component: CVLS MDST
has source info: CVLS_50498
has source info: CVLS_52333
broader: MALM
has lower boundary definition: Drawn at the base of pale grey limestone of Cove Limestone Member where it rests conformably (but gradationally and slightly diachronously) on the mid dark-grey limestone of the Scalebar Quarry Limestone Member, Kilnsey Formation, or locally, unconformably on Lower Palaeozoic strata (eg, in Crummack Dale) [SD 781 707 to 767 710].
has geographical distribution: Southern part of the Askrigg Block, north of Settle.
has lithology description: Pale grey to very pale grey limestone, mainly medium- and coarse-grained calcarenite, bioclastic and peloidal packstones and grainstones, massive to weakly bedded. Subordinate micrites ("Porcellaneous Bed"), variably fenestral, and clay beds occur locally, the latter occurring in places above palaeokarstic surfaces. The member generally produces a topography characterised by steep grassy slopes, although the uppermost 6m forms a continuous scar (sub-vertical face), commonly with an overhang.
has thickness description: 72m thick in its type section at Malham Cove; 114m in the Cominco Borehole S2, south of the Middle Craven Fault.
has upper boundary definition: Is taken at a conspicuous bedding plane at the base the scar forming, pale grey limestones of the Gordale Limestone Member.

Clava Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CVM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41854
has lithology component: CVM LMST
has lithology component: CVM MDST
has lithology component: CVM SDST
has obsolete equivalent: CVM mn 2996
broader: NCB
has lower boundary definition: Conformable boundaries within the lower part of the Nairnside Sandstone Formation.
has geographical distribution: Not defined.
has lithology description: Dark grey and olive mudstones with dark limestone concretions and lenses. Also rare sandstones.
has thickness description: c 10 metres.
has upper boundary definition: Conformable boundaries within the lower part of the Nairnside Sandstone Formation.

Craven Grit
type: Concept
in scheme: NamedRockUnit
alternative label: CVN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: NE

Clousta Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: CVR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: CVR AGG
has lithology component: CVR AND
has lithology component: CVR ANDTFF
has lithology component: CVR BA
has lithology component: CVR MFTUF
has lithology component: CVR OLBA
has lithology component: CVR PSPYR
has lithology component: CVR RYTUF
broader: SAF

Craigavad Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CVS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
broader: NE

Carrickarade Vent
type: Concept
in scheme: NamedRockUnit
alternative label: CVT
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Cwrt-Yr-Ala Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
broader: NA

Churchway Coal (Forest Of Dean)
type: Concept
in scheme: NamedRockUnit
alternative label: CWAY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: CWAY COAL
broader: NE

Coed Wenallt Beds
type: Concept
in scheme: NamedRockUnit
alternative label: CWB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NE

Crapwell Coppice Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CWCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: CWCL ARLMST
has lithology component: CWCL LMST
has source info: CWCL_49880
broader: Athelstan Oolite Formation
has supplementary information: This is an informal unit, not used by the BGS, within the Athelstan Oolite Formation. For more information refer to Cave, 1977.

Crow Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: CWCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CWCO COAL
broader: PMCM

Cowie Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CWE
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41857
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41858
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41859
has lithology component: CWE CONG
has lithology component: CWE FELS
has lithology component: CWE MDST
has lithology component: CWE SDST
has lithology component: CWE SLST
has source info: CWE_48869
has source info: CWE_48880
has source info: CWE_48881
has source info: CWE_50622
has source info: CWE_51673
has source info: CWE_51981
has obsolete equivalent: CWE mn 1093
has obsolete equivalent: CWE mn 4015
has obsolete equivalent: CWE mn 4159
broader: SHG
narrower: Castle Of Cowie Member
narrower: DICT
narrower: Cowie Harbour Conglomerate Member
narrower: PRS
narrower: Cowie Harbour Siltstone Member
narrower: RDS
narrower: Brown And Grey Sandstone Member
has lower boundary definition: An angular unconformity on meta-igneous and metasedimentary rocks of the Highland Border Complex.
has geographical distribution: The Stonehaven area and west to Elfhill [NO 797 849].
has lithology description: A fine- to medium-grained, locally pebbly, lithic sandstone interbedded with minor conglomerate, siltstone, mudstone and acid lavas.
has thickness description: From 490-640 m thick according to Carroll (1995), and 730 m thick estimated by Armstrong and Paterson (1970).
has upper boundary definition: The top of the highest bed of laminated, grey siltstone of the Cowie Harbour Siltstone Member, that is conformably overlain by red, cross-bedded, fine- to medium-grained sandstone of the Carron Sandstone Formation.

Colwell Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CWELL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: CWELL LMST
broader: Alston Formation

Clay-With-Flints Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: NO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41860
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41861
has lithology component: CWF DMTN
has lithology component: CWF S
has lithology component: CWF SC
has lithology component: CWF SV
has source info: CWF_49113
has source info: CWF_49114
has source info: CWF_49670
has source info: CWF_49671
has source info: CWF_50261
has source info: CWF_50387
has source info: CWF_50421
has source info: CWF_52083
has obsolete equivalent: CWF st 193
broader: RESID
narrower: Headley Heath Member
has additional age information: ?Pliocene to ?Early Quaternary.
has lower boundary definition: The Clay-with-Flint Formation rests upon Palaeogene formations, Chalk Group or Upper Greensand. Where it rests upon a Palaeogene formation or Upper Greensand, the base is taken at the base of intense cryoturbation. The base may be flat or may be highly uneven where it rests in dissolution hollows, particularly where it rests upon the Chalk. If the material is soliflucted and comes to rest on an inclined surface on a hillside, then it is classed as Head and not as a part of the Clay-with-Flints Formation.
has geographical distribution: Co-incidental with the outcrop of the Chalk Group, along the Chiltern Hills as far as Letchworth (Hertfordshire), the North Downs as far as Dover, the South Downs as far as Eastbourne, westwards to Sidmouth (Devon), with extension across the Upper Greensand outcrop of Devon and Somerset as far as the Blackdown Hills above Wellington, Somerset.
has lithology description: The Clay-with-Flints Formation is a residual deposit formed from the dissolution, decalcification and cryoturbation of bedrock strata of the Chalk Group and Palaeogene formations and, in the extreme west of the outcrop, the Upper Greensand Formation. It is unbedded and heterogenous. The dominant lithology is orange-brown and red-brown sandy clay with abundant nodules and rounded pebbles of flint. Angular flints are derived from the Chalk, and rounded flints, sand and clay from Palaeogene formations. There is commonly a discontinuous basal layer up to 100m thick, with dark brown to black matrix, stiff, waxy and fissured, with relatively fresh flint nodules stained black or dark green with manganese or glauconite. The deposit locally includes bodies of yellow fine- to medium- grained sand, reddish brown clayey silt, and sandy clay with beds of well-rounded flint pebbles, derived from Palaeogene formations. In the extreme west of the outcrop, in Devonshire, the deposit locally comprises sand and clayey sand containing angular, shattered blocks of chert. This is derived wholly from the Upper Greensand Formation, in areas where the Chalk Group has been removed by erosion.
has thickness description: Up to c 10m, but very variable where let down into dissolution pipes in the Chalk Pipes and hollows may be 1 to 50m in diameter.
has upper boundary definition: Commonly occurs at surface. Mainly overlain by Middle Quaternary glacial deposits, particularly in Hertfordshire. Locally overlain by Late Quaternary head or fluvial deposits.

Cowpits Five Foot Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: CWFF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CWFF COAL
broader: LCMS

Corwen Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: CWG
has current status: CURRENT
has theme: BEDRCK
notation: CWG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41862
has lithology component: CWG LMST
has lithology component: CWG SDST
has lithology component: CWG SLST
has source info: CWG_51836
has obsolete equivalent: CWG mn 1072
broader: Dolhir Formation
has lower boundary definition: Base overlies calcareous sandstones of the Dolhir Formation.
has geographical distribution: Not defined.
has lithology description: Coarse grained sandstones, thin siltstones and a locally developed limestone member at the base. Richly fossiliferous.
has thickness description: 70 metres. Lateral variations, 21 metres - 70 metres.
has upper boundary definition: Top is succeeded by pale grey siltstones with some interbedded thin sandstones of the Fron Frys Formation.

Cwar Glas Member
type: Concept
in scheme: NamedRockUnit
alternative label: CWGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41863
has lithology component: CWGL MDST
has lithology component: CWGL SDST
has lithology component: CWGL SLST
has source info: CWGL_49748
has source info: CWGL_50080
has source info: CWGL_50306
has source info: CWGL_51914
has obsolete equivalent: CWGL mn 798
has obsolete equivalent: CWGL mn 1798
has obsolete equivalent: CWGL mn 797
has obsolete equivalent: CWGL mn 1797
broader: Hafod Fawr Formation
has lower boundary definition: Taken at the base of the first packet of thick bedded fine-grained sandstone with hummocky cross statification and parallel lamination of the Cwar Glas Member above the mudstones and siltstones with abundant thin to medium bedded fine-grained sheet sandstones of the Hafod Fawr Formation.
has geographical distribution: Northeast Carmarthenshire (SN 73 24), South Wales.
has lithology description: Greenish grey mudstones and siltstones with abundant thin to medium bedded fine-grained sheet sandstones. Scattered burrows. Packets of thicker bedded green grey and purple fine-grained sandstone with hummocky cross statification and parallel lamination occur throughout the member. In the west of the outcrop the member becomes predominantly sandstone.
has thickness description: 0 to 66m
has upper boundary definition: Taken at the incoming of low angle cross bedded lilac coloured conglomerates, conglomeratic quartzites and coarse-grained quartzites of the Mynydd Myddfai Formation above the thick bedded greenish grey and purple fine-grained sandstones of the Cwar Glas Member of the Hafod Fawr Formation.

Clogwyn Gottal Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: CWGOT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41864
has lithology component: CWGOT FTUFF
has lithology component: CWGOT VCSLST
has lithology component: CWGOT VCSST
has source info: CWGOT_52107
has lateral equivalent: CWGOT CCV
broader: Cwm Eigiau Formation
has lower boundary definition: Conformably overlies silty mudstones of the Nant Ffrancon Subgroup.
has geographical distribution: Central Snowdonia.
has lithology description: Poorly sorted, heterolithic, felsic tuff with clasts of rhyolite, tuff and sedimentary rocks, interbedded with volcaniclastic sandstones and siltstones.
has thickness description: 15m
has upper boundary definition: Conformably overlain by sandstones of the Cwm Eigiau Formation.

Chorleywood Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: NE

Cowie Harbour Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: CWHC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CWHC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41865
has lithology component: CWHC CONG
has lithology component: CWHC SDST
has source info: CWHC_48877
has source info: CWHC_51132
has source info: CWHC_51673
has source info: CWHC_51745
has source info: CWHC_51904
has obsolete equivalent: CWHC VC
broader: Cowie Sandstone Formation
has lower boundary definition: The base of the lowest bed of poorly-sorted, volcaniclastic conglomerate or pebbly sandstone above a succession of grey-green volcaniclastic sandstones of the 'Brown and Grey Sandstone 'Member' of Carroll, 1994.
has geographical distribution: Stonehaven area.
has lithology description: Sandstone, pebbly sandstone and largely volcaniclastic conglomerate.
has thickness description: From 20 m to 30 m thick. The type section is cut by strike-parallel faults of unknown displacement.
has upper boundary definition: The base of the lowest bed of cross-bedded medium-grained sandstones of the Red Sandstone 'Member' overlying green and red, massive, coarse-grained pebbly volcaniclastic sandstones of the Cowie Harbour Conglomerate Member.

Claywood Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: CWIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CWIR FEST
broader: PLCM

Cawk Cove Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CWK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cwk
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41866
has lithology component: CWK VCSST
has source info: CWK_49453
has obsolete equivalent: CWK mn 835
broader: Deepdale Sandstone Formation
has lower boundary definition: Unconformable contact with ignimbrite of the Helvellyn Tuff Formation.
has geographical distribution: Deepdale and Rydal Head, northeast Lake District (between Grasmere and Patterdale).
has lithology description: Stratified pebbly volcaniclastic sandstone with a few intercalations of bedded coarse-grained volcaniclastic sandstone.
has thickness description: 90m (maximum)
has upper boundary definition: Indistinct contact with bedded volcaniclastic sandstone (undivided) of the Deepdale Sandstone Formation.

Castlewood Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CWL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Caaf Water Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWLS
has current status: CURRENT
has theme: BEDRCK
notation: CWLs
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41867
has lithology component: CWLS LMST
has source info: CWLS_49255
broader: NE
narrower: Corsankell Limestone
narrower: LLNL
narrower: ULLS
narrower: Diddup Limestone
narrower: TPLS
has lower boundary definition: Passes down into the Dalry Sandstone Formation.
has geographical distribution: Not defined.
has lithology description: Limestones as part of a cyclical sequence of limestone, mudstone, siltstone and sandstone.
has thickness description: 105 metres but thinning to around 10 metres southwards.
has upper boundary definition: Passes up into the Monkcastle Sandstone Formation.

Clown Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: CWMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CWMB MDST
has lithology component: CWMB SHMDST
has source info: CWMB_49180
has lateral equivalent: CWMB st 491
has obsolete equivalent: CWMB st 347
has obsolete equivalent: CWMB st 506
has lateral equivalent: CWMB st 347
has lateral equivalent: CWMB st 506
has obsolete equivalent: CWMB st 491
broader: PMCM

Cwm Clyd Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CWMC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NP

Cwm Graig Ddu Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWMG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NP

Cwmmawr Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CWMMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: CWMMC COAL
broader: SWMCM
has supplementary information: Note that this seam is within the South Wales Middle Coal Measures Formation and should not be confused with another Cwm Mawr (or Cwmmawr) Coal within the Brithdir Member of the Pennant Sandstone Formation farther to the west.

Cwm Barn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cwn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41869
has lithology component: CWN CONG
has lithology component: CWN MDST
has lithology component: CWN SDST
has obsolete equivalent: CWN mn 1194
broader: NA
has lower boundary definition: Taken at base of first pebbly mudstone or conglomerate above the mudstone dominated sequence of the Rhayader Pale Shales.
has geographical distribution: Central Wales, northwest flank of Tywi Anticline.
has lithology description: Interbedded conglomerates, sandstones and turbidite mudstones with some thick units of pebbly mudstone. Subordinate thin laminated or burrowed hemipelagites.
has thickness description: Up to 150m.
has upper boundary definition: Gradational but taken at base of mudstone dominated sequence with sparse thin turbidite sandstones of the Caeran Mudstones.

Crown Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: CWNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: CWNC COAL
has lateral equivalent: CWNC st 891
broader: PMCM

Ceiswyn Formation And Nod Glas Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CWNG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CWNG MDST
has lithology component: CWNG SDST
has lithology component: CWNG SLMDST
has lithology component: CWNG SLST
has lithology component: CWNG TUF
broader: OGW

Cowleigh Park Formation [Obsolete Code: Use Cpa]
type: Concept
in scheme: NamedRockUnit
alternative label: CWP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
broader: NE

Cowhythe Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CwPs
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41870
has lithology component: CWPS CALPL
has lithology component: CWPS CALSIR
has lithology component: CWPS CALSPL
has lithology component: CWPS LMST
has lithology component: CWPS PEL
has lithology component: CWPS PSAMM
has lithology component: CWPS SEMPEL
has source info: CWPS_48670
has source info: CWPS_49235
has source info: CWPS_50001
has source info: CWPS_51142
has obsolete equivalent: CWPS mn 1092
broader: Crinan Subgroup
has lower boundary definition: Not seen at type section due to Portsoy Shear Zone.
has geographical distribution: From Moray Firth coast [NJ 592 661 - NJ 609 664] southwards to 4km east of Huntly [NJ 570 406].
has lithology description: Psammite and semipelite, interbedded, thinly-banded, gneissose in part. Calcareous near base (dominantly calc-silicate beds). Also contains limestone unit in lower part (Rosehall Croft Limestone) and beds of calcareous semipelite near top. Locally migmatitic with quartz and leucotonalite veining.
has thickness description: Probably 800m in coast section; may reach 1.5km around Cornhill.
has upper boundary definition: Lowest (white) limestone on western side of Old Hythe Bay.

Cairnwell Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWQU
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: CWQU QZITE
broader: Ballachulish Subgroup

Cowie Rock
type: Concept
in scheme: NamedRockUnit
alternative label: CWRK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: CWRK SDST
broader: ULGS
has geographical distribution: Of the Stirling area, etc.

Westphalian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CWRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
broader: NE

Cowlairs Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CWS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CWS SDST
broader: LSC
has lithology description: Massive, false-bedded sandstone.

Corton Woods Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CWSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41871
has lithogenesis: GLACI
has lithology component: CWSG S
has lithology component: CWSG V
has source info: CWSG_49679
has source info: CWSG_50254
has source info: CWSG_50256
has source info: CWSG_50278
has source info: CWSG_52036
has source info: CWSG_53051
has lateral equivalent: CWSG st 213
has obsolete equivalent: CWSG mn 1812
has obsolete equivalent: CWSG mn 1071
broader: Briton's Lane Formation
has additional age information: Pleistocene (post Anglian).
has lower boundary definition: The Corton Woods Sand and Gravel Member rests unconformably on the pebbly silt and clay of the Pleasure Gardens Till Member (of the Lowestoft Formation), but also locally in cliff sections at [TM 5464 9660] a layer of black clayey silt up to 0.4m thick intervenes. The Member may also overlie the sands of the Corton Formation; where this occurs, the base is marked by the incoming of gravel.
has geographical distribution: Restricted to the area of northern Lowestoft, East Anglia.
has lithology description: The Corton Woods Sand and Gravel Member is composed of medium gravels and fine- to coarse-grained sands. The gravels comprise mainly flint, with subordinate quartz and quartzite. The gravels tend to be strongly imbricated in coastal sections. Inland there are few exposures and they comprise pebbly, well-rounded, medium-grained sands.
has thickness description: Probably up to about 7m, but only 4.3m at type section.
has upper boundary definition: The upper surface of the Corton Woods Sand and Gravel Member is typically exposed at surface, but very locally is overlain by Head in several small valleys.

Collyweston Slate
type: Concept
in scheme: NamedRockUnit
alternative label: CWSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: NE

Crow Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: CWST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CWST SDST
broader: PLCM

Caw Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CwT
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41872
has lithology component: CWT VCBR
has lithology component: CWT VCSST
has source info: CWT_50725
has source info: CWT_51787
has obsolete equivalent: CWT mn 831
has obsolete equivalent: CWT mn 832
broader: Borrowdale Volcanic Group
has lower boundary definition: Base of volcaniclastic sandstone or breccia that overlies, with local unconformity, the Lickle Tuff Formation (Stickle Pike Tuff Member) rhyolitic tuff.
has geographical distribution: Confined within the Ulpha Basin. Main outcrop is on Caw (SD 230 944) extends south to Appletree Worth (SD 247 930), north to Grassguards Fault (SD 230 960) and west to Stickle Pike (SD 212 917), Cumbria.
has lithology description: Volcaniclastic sandstone and breccia, bedded, coarsening upwards.
has thickness description: 0 to 700m
has upper boundary definition: Overlain by dacitic lapilli-tuff of the Lag Bank Tuff Formation.

Careg-Wiber Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWV
has current status: CURRENT
has theme: BEDRCK
notation: CwV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41873
has lithology component: CWV CONG
has lithology component: CWV MDST
has lithology component: CWV TUF
has lithology component: CWV VCBR
has lithology component: CWV VCSST
broader: NE
has lower boundary definition: Gradational.
has geographical distribution: North limit: Castle Bank (hill) (SO 0900 6154). West, east and south limits outside of limits of Sheet 178.
has lithology description: Volcaniclastic sandstone and conglomerate with few intercalations of mudstone, some interbedded basaltic lava and/or volcanic breccia, sediments overly tuffite and/or ash flow tuff.
has thickness description: Approx. 1200 metres.
has upper boundary definition: Faulted.

Cwmystwyth Grits Group
type: Concept
in scheme: NamedRockUnit
alternative label: CWY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has lithology component: CWY AROC
has lithology component: CWY SDST
broader: NE
narrower: Doethie Formation
narrower: PTR
narrower: Glanyrafon Formation
narrower: Blaen Myherin Mudstones Formation
narrower: RDD

Clwyd Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CWYDV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41874
has lithology component: CWYDV C
has lithology component: CWYDV P
has lithology component: CWYDV S
has lithology component: CWYDV V
has lithology component: CWYDV Z
has source info: CWYDV_49173
has source info: CWYDV_49719
has source info: CWYDV_52509
has obsolete equivalent: CWYDV ALV
has obsolete equivalent: CWYDV HEAD
has obsolete equivalent: CWYDV RTD
has obsolete equivalent: CWYDV ALF
has obsolete equivalent: CWYDV LDE
broader: Cheshire - North Wales Catchments Subgroup
has lower boundary definition: Sharp, unconformable and locally channelised, predominately on bedrock and Late Devensian head and glacigenic deposits (e.g Ruabon Member and Wheeler Member of Bowen, 1999, p.89, and Lleyn Formation). Interdigitates in a complex manner with Tidal Flat Deposits (Gwynllwg Formation of Bowen, 1999) in the estuary (Warren et al, 1984).
has geographical distribution: The valley of the River Clwyd and its tributaries (Clwyd), northern Wales.
has lithology description: Unconsolidated, stratified gravels, sands, silts and clays forming the alluvial deposits of the River (Afon) Clwyd and its tributaries. Includes contemporaneous head, colluvium and pedogenic deposits within the catchment area. Clasts comprise variable proportions of Lower Palaeozoic turbidites, Ordovician volcanic rocks, Permian/Trias sandstone and Carboniferous Limestone and Coal Measures reflecting the underlying bedrock geology and complex glacigenic sequence. North of approximately Denbigh, the deposits in the Clwyd and the Wheeler valleys, as well as those in the lower reaches of the Elwy valley, may contain exotic (Irish Sea Ice-derived) materials reworked from the Lleyn Formation. Aggradational river terraces and major alluvial fans are dominated by pebble cobble gravels and medium- to coarse-grained sand; the modern floodplain is dominated by silt and clay, and locally includes lenses of peat (Warren et al, 1984).
has supplementary information: Rowlands (1955) proposed that some of the terraces might relate to a moraine-dammed lake (Lake Clwyd) formed after the complete withdrawal of ice from the Vale; Warren et al. (1984) found no evidence of any of the deposits relating to any of Rowlands' proposed ice-dammed lakes.
has thickness description: Generally to around 10m; 8m were recorded by Warren et al (1984) in the Vale of Clwyd and 6m are exposed near Plasnewydd [SH 9460 6640].
has upper boundary definition: Generally the present ground surface or, locally, overlain by peat.

Cromlix Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CXF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CLX
has revision number: 4
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41875
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41876
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41877
has lithology component: CXF MDST
has lithology component: CXF SDST
has lithology component: CXF SLMDST
has lithology component: CXF SLST
has source info: CXF_48855
has source info: CXF_49343
has source info: CXF_50545
has source info: CXF_51629
has source info: CXF_51673
has source info: CXF_52711
has obsolete equivalent: CXF mn 1146
has obsolete equivalent: CXF mn 1420
has lateral equivalent: CXF st 731
has obsolete equivalent: CXF mn 1419
has obsolete equivalent: CXF mn 2336
broader: SEG
narrower: SHAS
narrower: MALC
narrower: TDCO
has lower boundary definition: Conformable, locally diachronous or interfingered base of red, massive or laminated and poorly-sorted, siltstone or mudstone, overlying fine- to medium-grained cross-bedded sandstone or conglomerate of the Arbuthnott-Garvock Group.
has geographical distribution: Northern Midland Valley, between Stirling and Drumlithie.
has lithology description: Characteristically soft, bright red to dull brownish-red, maroon or purplish-brown, with green reduction spots in the north-eastern Midland Valley, generally massive but often thinly laminated, poorly-sorted, fine-grained silty sandstones, sandy siltstones, siltstones and mudstones, which lithologies may be locally interbedded with thin lenses of medium to coarse-grained pebbly sandstone.
has thickness description: From 240 m to 1200 m, passing laterally into the Teith Sandstone Formation (or former Edzell Sandstone Formation) towards the northwest.
has upper boundary definition: Conformable and gradational, generally diachronous, interfingering with and passing up into the Teith Sandstone Formation (or former Edzell Sandstone Formation) with increasing abundance of sandstone lithologies.

Croxton Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: CXSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
broader: NE

Cymerig Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OS
has predominant age: OS
has youngest age: OS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41878
has lithology component: CY LMST
has lithology component: CY MDST
has lithology component: CY TFAMST
has source info: CY_49058
has source info: CY_49215
has source info: CY_50546
has source info: CY_51533
has source info: CY_52119
has obsolete equivalent: CY mn 207
has obsolete equivalent: CY mn 1197
broader: Gelli-Grin Calcareous Ash Formation
has additional age information: Caradoc (Woolstonian).
has lower boundary definition: Conformable boundary with the calcareous tuffaceous mudstones of the Gelli-grin Calcareous Ash Formation.
has geographical distribution: Bala and Corwen districts, North Wales.
has lithology description: Massive or concretionary, dark blue-grey, coarsely crystalline limestone with interbedded calcareous, locally tuffaceous, mudstones.
has thickness description: 0-4m
has upper boundary definition: Gradational, passing conformably upwards into the calcareous tuffaceous mudstones of the Gelli-grin Calcareous Ash Formation.

Cwm Yr Aethnen Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cya
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: CYA MDST
has lithology component: CYA SLST
has source info: CYA_49215
has obsolete equivalent: CYA mn 1190
has obsolete equivalent: CYA mn 1191
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Not defined.
has lithology description: Dark blue mudstones and laminated siltstones.
has thickness description: 0 to 150m
has upper boundary definition: Not defined.

Corrieyairack Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: CYACK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: CY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41879
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41880
has lithology component: CYACK GD
has lithology component: CYACK GDM
has lithology component: CYACK GN
has lithology component: CYACK GNL
has lithology component: CYACK MCGN
has source info: CYACK_51925
has source info: CYACK_52574
has obsolete equivalent: CYACK mn 1061
broader: Argyll And Northern Highlands Granitic Suite
has geographical distribution: Southwestern Monadhliath Mountains in north-eastern part of the Glen Roy district and north-western part of the Dalwhinnie district (Scotland sheets 63W and 63E).
has lithology description: Granodiorite, aphyric, pinkish-white, massive equigranular, medium- to coarse-grained, hornblende-/biotite-bearing rock. Separate mafic (more hornblende-rich) granodiorite body at southern end of main pluton. Detached white to pink, medium- to coarse-grained, xenolithic leucogranite body to south of main pluton. Minor granite veins throughout pluton.

Comley Breccia Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CYBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ED
has predominant age: ED
has youngest age: ED
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41881
has lithology component: CYBB BREC
has lithology component: CYBB SDST
has source info: CYBB_49265
has source info: CYBB_50414
has source info: CYBB_51269
broader: Hill House Grits Member
has lower boundary definition: Unconformable on Lower Comley Sandstone Formation.
has geographical distribution: Comley area, Shropshire.
has lithology description: Sedimentary breccia of glauconitic sandstone and pink limestone clasts, set in a matrix of glauconitic sandstone.
has thickness description: 3 to 4m
has upper boundary definition: Appears to be conformably overlain by the main part of the Hill House Grits.

Cadbury Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CaBr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41882
has lithology component: CYBR BREC
has lithology component: CYBR MDST
has lithology component: CYBR SDST
has source info: CYBR_48820
has source info: CYBR_49280
has source info: CYBR_52249
has obsolete equivalent: CYBR mn 727
broader: Exeter Group
has lower boundary definition: Rests unconformably on Bude Formation or Crackington Formation.
has geographical distribution: Extends along northern side of Crediton Trough from near Lower Creedy, Crediton (SS 845 030), eastwards to near Clyst Hydon.
has lithology description: Brown to reddish-brown unbedded to very roughly bedded breccia, consisting of angular to subrounded pebbles and cobbles of Culm Sandstone in very poorly sorted gritty, clayey, sandy, silt. The clasts are mainly locally derived Culm Sandstone generally not exceeding 0.3m diameter; other clasts include vein quartz, chert and fossiliferous sandstone of Pilton Beds type. Unnamed unit of sand and clay mapped with Cadbury Breccia between Greenslinch (SS 969 035) and Hele (SS 999 030).
has thickness description: Up to 270m
has upper boundary definition: Overlain in eastern part of Crediton Trough by Thorverton Sandstone (q.v.), Crediton Breccia (q.v.) or Bow Breccia (q.v.).

Craigskelly Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: CYC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CYC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: SR
has youngest age: SR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41883
has lithology component: CYC CALSST
has lithology component: CYC CONG
has lithology component: CYC MDST
has lithology component: CYC SDST
has source info: CYC_50121
has source info: CYC_52283
has source info: CYC_52526
has source info: CYC_52760
broader: NEWL
has lower boundary definition: Unconformable on Ordovician.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Flaggy sandstones with prominent calcareous lenses full of shells.
has thickness description: 40m
has upper boundary definition: Conformably overlain by Woodland Formation.

Chavery Coal (Derbyshire And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: CYCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CYCO COAL
broader: PLCM

Chavery Coal (Lower Leaf)
type: Concept
in scheme: NamedRockUnit
alternative label: CYCOL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CYCOL COAL
broader: PLCM

Chavery Coal (Upper Leaf)
type: Concept
in scheme: NamedRockUnit
alternative label: CYCOU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CYCOU COAL
broader: PLCM

Clyde Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CYD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41885
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41884
has lithology component: CYD LMST
has lithology component: CYD MDST
has lithology component: CYD SDST
has lithology component: CYD SLST
has source info: CYD_50587
has obsolete equivalent: CYD mn 212
has obsolete equivalent: CYD mn 1306
broader: INV
narrower: SBGS
narrower: Eileans Sandstone Member
narrower: MLC
narrower: MPS
narrower: OVS
narrower: LGT
narrower: KKS
narrower: Ascog Member
narrower: Broadlee Glen Sandstone Member
narrower: Gourock Sandstone Member
has lower boundary definition: Conformable base taken in a transition from the underlying mudstone/cementstone association of the Ballagan Formation to a sandstone dominated succession.
has geographical distribution: Scottish Midland Valley.
has lithology description: Predominantly sandstone, commonly pebbly with beds of red-brown or grey mudstone. Pedogenic carbonate as nodules and beds especially in lower part, also present as rip-up clasts.
has thickness description: 0 to 300m+
has upper boundary definition: The top is marked by the overlying Clyde Plateau Volcanic Formation.

Coatyards Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: CYDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: CYDC COAL
broader: PLCM

Coatyards Limestone [Duplicate Code: Use Cylm]
type: Concept
in scheme: NamedRockUnit
alternative label: CYDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CYDS LMST
has lithology component: CYDS MDST
broader: SMGP
broader: ULGS

Cwm-Yr-Eglwys Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYEM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CYEM MDST
has lithology component: CYEM SDST
broader: NA

Cerrig Gwynion Grits Facies (Caban Conglomerate Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: CYG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CyG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41886
has lithology component: CYG SDST
has source info: CYG_49281
has source info: CYG_51079
has obsolete equivalent: CYG mn 862
has obsolete equivalent: CYG mn 861
broader: Caban Conglomerate Formation
has lower boundary definition: No definition.
has geographical distribution: Central Wales.
has lithology description: Medium- to coarse-grained, thick-bedded sandstones, pebbly in places.
has thickness description: No definition.
has upper boundary definition: No definition.

Craig-Y-Gaer Coral Bed
type: Concept
in scheme: NamedRockUnit
alternative label: CYGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41887
has lithology component: CYGC LMGST
has lithology component: CYGC LMST
has source info: CYGC_48805
has source info: CYGC_51233
has obsolete equivalent: CYGC CORA
broader: Gilwern Oolite Formation
has additional age information: ?Chadian.
has lower boundary definition: The base is placed at a sharp, irregular, partly stylolitized erosion surface where the coarse grainstone at the base of the Craig-y-Gaer Coral Bed rests, locally with angular discordance, on micritic lime mudstones at the top of the underlying Darren Ddu Member of the Coed Ffyddlwn Formation.
has geographical distribution: Clydach Valley [SO 215 126], on the northeast crop of the South Wales Coalfield.
has lithology description: Pale grey, shelly, fossiliferous, crinoid-rich coarse grainstone.
has thickness description: 2 to 3m
has upper boundary definition: The upper boundary is locally gradational, but mainly a sharp, stylolitized irregular surface above which are the ooidal grainstones that form most of the Gilwern Oolite Formation.

Coed-Y-Glyn Sill
type: Concept
in scheme: NamedRockUnit
alternative label: CYGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CYGS AFTR
has source info: CYGS_49033
broader: NA
has lower boundary definition: Not applicable.
has geographical distribution: Not specified.
has lithology description: Alkali-feldspar trachyte
has thickness description: Not recorded.
has upper boundary definition: Not applicable.

Cwm-Yr-Hob Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CYH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41888
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41889
has lithology component: CYH SDST
has lithology component: CYH SLMDST
has lithology component: CYH SLST
has source info: CYH_50860
has source info: CYH_51580
has lateral equivalent: CYH st 38
broader: Bailey Hill Formation
has lower boundary definition: Disappearance of thick mudstone turbidite units of underlying undifferentiated Bailey Hill Formation.
has geographical distribution: Dies out southwards; southern limit at c. (SO 158 795); northwards extends at least as far as (SO 120 850).
has lithology description: Interlaminated and very thinly interbedded grey silty mudstone, siltstone/fine-grained sandstone and carbonaceous (anoxic) hemipelagite; disruptive bioturbation negligible.
has thickness description: Up to 220m thick.
has upper boundary definition: First appearance of significant disruptive bioturbation, indicating onset of oxic bottom conditions.

Carreg Yr Imbill Dolerite
type: Concept
in scheme: NamedRockUnit
alternative label: CYID
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CYID GB
has lithology component: CYID MCGB
has source info: CYID_50909
broader: NA
has lower boundary definition: Not seen.
has geographical distribution: Not specified.
has lithology description: Coarse-grained microgabbro with gabbroic pegmatite and olivine metadolerite patches.
has thickness description: Unknown.
has upper boundary definition: Not seen.

Clynekirkton Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Cyk
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JD
has lithology component: CYK CALSST
has lithology component: CYK LMST
has lithology component: CYK MDST
has lithology component: CYK SDST
has lithology component: CYK SLST
has source info: CYK_49403
has obsolete equivalent: CYK mn 629
is obsolete equivalent of: CYK SUTH
broader: NA

Craig Y Llam Formation
type: Concept
in scheme: NamedRockUnit
alternative label: CYLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CYLF MDST
has lithology component: CYLF RY
has lithology component: CYLF TUF
has source info: CYLF_49828
has source info: CYLF_50697
has source info: CYLF_51272
has obsolete equivalent: CYLF mn 1102
has obsolete equivalent: CYLF mn 4325
broader: Aran Volcanic Group
has lower boundary definition: A well exposed transition from disturbed or bedded mustones of the Tyr Gawen Formation to massive, locally nodular ash-flow tuffs. Contact disrupted in places by loading and fluidisation of underlying mudstone.
has geographical distribution: Extends westwards from Cadair Idris as far as Ffridd Cocyn (6250 0450) where it dies out.
has lithology description: Massive, ash-flow tuffs, locally lapilli-rich, with subordinate rhyolites, mudstone debris flows and tuffaceous sediments.
has thickness description: 0-300m
has upper boundary definition: Well exposed. Transition from massive tuff, rhyolite or tuffaceous siltstones into mudstone. Contact placed where mudstone becomes dominant.

Coatyards Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: CYLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: CYLM LMST
has lithology component: CYLM MDST
broader: SMGP
broader: ULGS

Conybeare Group [Duplicate Entry: Use Cnyb]
type: Concept
in scheme: NamedRockUnit
alternative label: CYNB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
broader: NE

Cystoid Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41891
has lithology component: CYO LMST
has source info: CYO_50532
has source info: CYO_52407
has source info: CYO_52930
has obsolete equivalent: CYO mn 3998
has obsolete equivalent: CYO mn 1199
broader: Ashgill Formation
has lower boundary definition: Base of limestone above grey mudstones.
has geographical distribution: Howgill Fells - may correlate with the Troutbeck Member of the Lake District.
has lithology description: Pale grey argillaceous limestone.
has thickness description: 1.5 to 3m
has upper boundary definition: Top of limestone, transitional to grey mudstone.

Craig Yr Odyn Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYOM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: CYOM MDST
has source info: CYOM_51485
broader: Dinas Island Formation
has additional age information: Caradoc (?Onnian).
has lower boundary definition: Conformable within the sandstones of the Dinas Island Formation.
has geographical distribution: Not specified.
has lithology description: Dark grey turbiditic and interbedded black laminated hemipelagic mudstones.
has thickness description: 20 to 50m
has upper boundary definition: Conformable within the sandstones of the Dinas Island Formation.

Claymore Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JV
broader: KC

Carey Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41893
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41894
has lithology component: CYSI C
has lithology component: CYSI S
has lithology component: CYSI V
has lithology component: CYSI Z
has source info: CYSI_49190
has source info: CYSI_52815
has obsolete equivalent: CYSI mn 786
broader: Carse Clay Formation
has additional age information: Loch Lomond Stadial to Holocene.
has lower boundary definition: Unconformable and transgressive base on older units including the Tay-Earn Gravels and Culfargie Sand members of the Forth Clay Formation and the Errol Clay Formation.
has geographical distribution: River Earn from Bridge of Earn and the Tay east of Perth eastwards to the Tay bridges at Dundee adjacent to the Tay/Earn estuary.
has lithology description: Very fine- to coarse-grained sand, silt and clay, grey and brownish grey, well laminated to thin bedded, some pebbles up to 4cm, finely micaceous, rooty near top below sub-Carse Peat (Flanders Moss Peat Formation); depending on location within the palaeo-estuary, the dominant material varies from sand to clay. The deposit forms a series of raised beaches/terraces related to transgressive and regressive cycles of sea-level change.
has thickness description: Up to 8m
has upper boundary definition: Overlain unconformably by the sub-Carse Peat (Flanders Moss Peat Formation) and trangressive estuarine clay, silt and sand of the Carse of Gowrie Clay Member.

Cantray Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: CYTI
has current status: CURRENT
has theme: SPRFCL
notation: CAN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41896
has lithology component: CYTI CLAY
has lithology component: CYTI DMTN
has lithology component: CYTI GRAV
has lithology component: CYTI SANDU
has lithology component: CYTI SILT
has source info: CYTI_50681
has source info: CYTI_50834
has source info: CYTI_52490
has obsolete equivalent: CYTI mn 1209
broader: Beinn An Uain Till Formation
has lower boundary definition: Either a planar, gradational contact over 10 to 20cm with underlying stony, clayey, sandy diamictions of the Athais Till Formation, or a sharp, planar, glacitectonic boundary with that Formation. Locally filling wedge structures in the top surface of the Athais Till Formation.
has geographical distribution: Sheet 84W (Fortrose), southeast of Inverness.
has lithology description: Stony sandy clay diamicton, matrix supported, "strong brown" (Munsell Soil) to dark yellowish brown, fissile, massive, extremely compact, containing angular to subrounded clasts of gneissose psammite and semipelite, granite and Devonian sandstone and siltstone. Typical lodgement till with well developed north-easterly fabric and containing concavo-convex discontinuities that are commonly sand-filled. Commonly includes rip-up masses of the underlying till unit (Athais Till Formation).
has thickness description: 6.5m
has upper boundary definition: Generally a gradational contact, but a sharp change in colour, with dark yellowish brown stony sandy clay diamicton of the overlying Ruallan Till Member.

Christy's Walls Coal
type: Concept
in scheme: NamedRockUnit
alternative label: CYWA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: CYWA COAL
broader: Border Group

Coastal Zone Deposits (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: CZD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: CZD CLAY
has lithology component: CZD GRAV
has lithology component: CZD PEAT
has lithology component: CZD SANDU
has lithology component: CZD SILT
has obsolete equivalent: CZD CZD
is obsolete equivalent of: CZD CZD
broader: MCZD
narrower: ITD
narrower: STDU
has lithology description: Shingle, gravel, sand, silt and clay, locally with peat layers; may be bedded or chaotic; from the coastal zone. [Generic description].

Dalmellington Two Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: D2FT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: D2FT COAL
broader: MCMS

Appin Phyllite And Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAAP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAAP MDOLO
has lithology component: DAAP MLMST
has lithology component: DAAP PEL
has lithology component: DAAP PEPH
has lithology component: DAAP PSAMM
has lithology component: DAAP QZITE
has lithology component: DAAP SEMPEL
has lithology component: DAAP SPPH
is obsolete equivalent of: DAAP GLPL
broader: Ballachulish Subgroup
narrower: Appin Limestone Member

Appin Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAAQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAAQ QZITE
has lithology component: DAAQ SLTE
broader: Ballachulish Subgroup

Ards Quartzite
type: Concept
in scheme: NamedRockUnit
alternative label: DAAR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ards Black Schist
type: Concept
in scheme: NamedRockUnit
alternative label: DAAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Ballachulish Subgroup

Damery Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DAB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Blair Atholl Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DABA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BlAt
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41898
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41900
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41899
has lithology component: DABA MDOLO
has lithology component: DABA MLMST
has lithology component: DABA PELGP
has lithology component: DABA PSAMM
has lithology component: DABA SEMPEL
has source info: DABA_49952
has source info: DABA_50001
has source info: DABA_50024
has source info: DABA_51142
has source info: DABA_51365
has source info: DABA_51764
has source info: DABA_52396
has source info: DABA_52589
has obsolete equivalent: DABA mn 480
broader: Appin Group
narrower: Cnoc An Fhithich Banded Semipelite Formation
narrower: Cnoc An Fhithich Banded Semipelite Formation And Drumchastle Pale Limestone Formation (Undifferentiated)
narrower: Blair Atholl Dark Limestone And Dark Schist Formation
narrower: Drumchastle Pale Limestone Formation
narrower: Fordyce Limestone Formation
narrower: INCH
narrower: ISLL
narrower: Crathie Schist And Limestone Formation
narrower: Clashnoir Semipelite Formation
narrower: Ballygrant Formation
narrower: Cuil Bay Slate Formation
narrower: Lossit Limestone Formation
narrower: Lismore Limestone Formation
narrower: Mullach Dubh Phyllite Formation
narrower: LAPS
narrower: SRND
narrower: Glenfiddich Pelite Formation
narrower: TDSL
narrower: RIML
narrower: TUSC
narrower: Bruar Psammite Formation
narrower: Gleann Beag Schist Formation
narrower: Glencolumbkille Pelite Formation
has lower boundary definition: At top of Ballachulish Subgroup; generally at the transition from banded semipelite and limestone to more graphitic pelite with limestone beds.
has geographical distribution: Islay; Lismore; Appin; also a strip from near Blair Atholl to the Moray Firth coast at Sandend Bay (between Cullen and Portsoy). Also occurs in Ireland around Glencolumbkille and Falcarragh (Donegal) and in Connemara (Co. Galway).
has lithology description: Semipelite and pelite, much of it graphitic; interbedded with limestone units, the lower limestones typically graphitic, the uppermost typically dolomitic
has thickness description: c.300 to 600m (but locally tectonically thinned to 50m)
has upper boundary definition: At base of Islay Subgroup; generally transitional over a few metres where pale dolomitic limestone passes into psammite or quartzite with beds or larger units of diamictite.

Banded Group
type: Concept
in scheme: NamedRockUnit
alternative label: DABD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ballygrant Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DABG
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DABG mn 230
broader: Blair Atholl Subgroup
narrower: Beinn Bhreac Member
narrower: Bharradail Phyllite Member
narrower: STLS

Ballachulish Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DABH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Bchu
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41901
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41903
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41902
has lithology component: DABH CALPL
has lithology component: DABH LMST
has lithology component: DABH PEL
has lithology component: DABH PELGP
has lithology component: DABH PSAMM
has lithology component: DABH QZITE
has lithology component: DABH SEMPEL
has source info: DABH_49399
has source info: DABH_49464
has source info: DABH_49952
has source info: DABH_49980
has source info: DABH_50001
has source info: DABH_50024
has source info: DABH_51142
has source info: DABH_51365
has source info: DABH_51386
has source info: DABH_51764
has source info: DABH_52589
has obsolete equivalent: DABH mn 217
has obsolete equivalent: DABH mn 480
broader: Appin Group
narrower: Beinn A'Ghlo Transition Formation And Glen Clunie Graphitic Schist Formation (Undifferentiated)
narrower: Beinn A'Ghlo Transition Formation
narrower: Cock Burn Calcareous Schist Formation
narrower: NERI
narrower: MEDL
narrower: MEDQ
narrower: MEDS
narrower: MOGS
narrower: Corryhabbie Quartzite Formation
narrower: Cairnwell Quartzite Formation
narrower: Appin Phyllite And Limestone Formation
narrower: Appin Quartzite Formation
narrower: Ards Black Schist
narrower: Ballachulish Limestone Formation
narrower: DADP
narrower: Cnoc Donn Quartzite Formation
narrower: Kintra Dolostone Formation
narrower: Coire Cheap Formation
narrower: SFBS
narrower: SFPL
narrower: SFSFT
narrower: LUBE
narrower: MBSL
narrower: MDLGS
narrower: Glen Loch Phyllite And Limestone Formation
narrower: Ailnack Phyllite And Limestone Formation
narrower: Appin Transition Formation
narrower: An Socach Quartzite Formation
narrower: Ballachulish Slate Formation
narrower: TNPL
narrower: TULS
narrower: Birchwood Semipelite Formation
narrower: Glen Clunie Graphitic Schist Formation
narrower: Glen Clunie Schist Formation [Obsolete Code: Use Gcgs]
has lower boundary definition: At top of the Lochaber Subgroup: in most areas there is a prominent limestone at the base of the Ballachulish Subgroup: also pelites become markedly graphitic at boundary.
has geographical distribution: Islay; Appin to Lochaber; also a thin strip from near Loch Errochty to the Moray Firth coast at Sandend Bay (between Cullen and Portsoy). Also occurs in Ireland extensively in Co. Donegal.
has lithology description: Basal limestone, succeeded upward by graphitic pelite; this in turn overlain by persistent quartzite, which is overlain by striped semipelite with thin limestone units.
has thickness description: c.500-1100m (but locally tectonically thinned to 100m)

Ballachulish Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DABL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DABL CALPL
has lithology component: DABL CASCH
has lithology component: DABL DOLMST
has lithology component: DABL MARBLE
has lithology component: DABL MDOLO
has lithology component: DABL MLMST
has lithology component: DABL SCHT
has lithology component: DABL SEMPEL
has obsolete equivalent: DABL st 64
broader: Ballachulish Subgroup

Dab Limestone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: DABLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KO
has predominant age: KO
has youngest age: KO
has lithology component: DABLS LMST
broader: KYRE
has geographical distribution: West Shetland Basin

Bharradail Phyllite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DABP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DABP LMST
has lithology component: DABP SEMPEL
broader: Ballygrant Formation

Binnein Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DABQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DABQ MQAREN
has obsolete equivalent: DABQ mn 431
broader: LTSQ

Binnein Schist Member
type: Concept
in scheme: NamedRockUnit
alternative label: DABS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DABS PEL
has lithology component: DABS PSAMM
has obsolete equivalent: DABS mn 432
broader: LTSQ

Darroch Coal (North Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DAC COAL
broader: MCMS

Cuil Bay Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DACB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DACB MCABR
has lithology component: DACB PEL
has lithology component: DACB PELGP
has lithology component: DACB QZITE
has lithology component: DACB SEMPEL
has obsolete equivalent: DACB mn 1177
broader: Blair Atholl Subgroup

Colla Firth 'Group' [Obsolete Code: Use Cola]
type: Concept
in scheme: NamedRockUnit
alternative label: DACF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41904
has lithology component: DACF CALSIR
has lithology component: DACF GNSS
has lithology component: DACF LMST
has lithology component: DACF PSAMM
has lithology component: DACF SEMPEL
has source info: DACF_51099
has source info: DACF_52539
broader: NE
has lower boundary definition: Drawn at base of psammite of Colla Firth Group where it rests conformably on the Weisdale Limestone.
has geographical distribution: Shetlands, Scotland.
has lithology description: Composed of micaceous psammite with subordinate semi-pelite, calc-silicate rock and crystalline limestone. Migmatitic gneiss also occurs.
has thickness description: About 3500 m thick.
has upper boundary definition: Drawn at conformable upward passage from psammite of the Colla Firth Group to the Girlsta Limestone.

Creeslough Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DACH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Lochaber Subgroup

Craithie Point Group
type: Concept
in scheme: NamedRockUnit
alternative label: DACP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Corvanaghan Formation [Obsolete Code: Use Corv]
type: Concept
in scheme: NamedRockUnit
alternative label: DACV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dark Group
type: Concept
in scheme: NamedRockUnit
alternative label: DADG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dark Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DADL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Cnoc Donn Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DADQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DADQ QZITE
broader: Ballachulish Subgroup

Dark Schists
type: Concept
in scheme: NamedRockUnit
alternative label: DADS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ell Coal (Dailly )
type: Concept
in scheme: NamedRockUnit
alternative label: DAE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAE COAL
has lateral equivalent: DAE st 241
broader: LSC

East Burra Group
type: Concept
in scheme: NamedRockUnit
alternative label: DAEB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Eilde Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAEQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAEQ MQAREN
has lithology component: DAEQ QZF
has obsolete equivalent: DAEQ mn 1431
broader: LTSQ

Eilde Schist Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAES PEL
has lithology component: DAES PSAMM
has obsolete equivalent: DAES mn 1432
broader: LTSQ

Lower Falcarragh Pelite
type: Concept
in scheme: NamedRockUnit
alternative label: DAFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Fintown Pelite
type: Concept
in scheme: NamedRockUnit
alternative label: DAFI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Falcarragh Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DAFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Druim An Fhurain Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DafS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41905
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41906
has lithology component: DAFS LMST
has lithology component: DAFS MDST
has lithology component: DAFS SDST
has source info: DAFS_49488
has source info: DAFS_49569
has source info: DAFS_50053
has obsolete equivalent: DAFS mn 3449
broader: Bearreraig Sandstone Formation
has lower boundary definition: Basal limestones resting on the Raasay Ironstone Formation or Portree Shale Formation.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Cross-bedded sandstones and sandy limestones comprise most of the Member. These are commonly either massive or thinly bedded and contain crinoid ossicles, bivalves, bryzoan, belemnites and brachiopod fragments, especially in the lower part of the succession. Limited to Straithaird peninsula, intense lateral variation.
has thickness description: 480m+
has upper boundary definition: Abrupt change from sandstone to mudstone of the Garantiana Shale Member.

Dailly Ground Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DAG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAG COAL
broader: NE

Glen Banvie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAGB MLMST
has lithology component: DAGB PEL
has lithology component: DAGB PSAMM
has obsolete equivalent: DAGB mn 1751
broader: Lochaber Subgroup
narrower: Carn A' Chlamain Member
narrower: Forest Lodge Member

Girlsta Limestone [Obsolete Code: Use Girl]
type: Concept
in scheme: NamedRockUnit
alternative label: DAGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Glen Coe Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAGQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAGQ MQAREN
has lithology component: DAGQ QZITE
has obsolete equivalent: DAGQ mn 1769
has obsolete equivalent: DAGQ mn 1770
broader: LTSQ

Dailly Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DAI
has current status: CURRENT
has theme: BEDRCK
notation: DAI
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41907
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41908
has lithology component: DAI CSSST
has lithology component: DAI MDST
has lithology component: DAI SLST
has lithology component: DAI WACKE
has source info: DAI_50121
has source info: DAI_52283
has source info: DAI_52526
has source info: DAI_52760
has obsolete equivalent: DAI mn 1203
has obsolete equivalent: DAI mn 3043
has obsolete equivalent: DAI mn 3284
broader: Girvan Group
narrower: LAU
narrower: LCRG
narrower: Drumyork Flags Formation
narrower: WOB
narrower: UCRG
narrower: PKF
narrower: PRO
narrower: MAX
narrower: Blair Shale Formation
has lower boundary definition: Disconformity at the base of the Camregan Grits Formation, resting on the Newlands Subgroup.
has geographical distribution: The Girvan area of south-west Scotland.
has lithology description: Flaggy sandstones, gritty sandstones, siltstones and mudstones.
has thickness description: About 1226 m thick.
has upper boundary definition: Conformably overlain by the Knockgardner Formation, the basal unit of the Straiton Subgroup.

Dalness Ignimbrite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAIG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Glencoe Volcanic Formation
narrower: LDI
narrower: Coire Eilde Tuffs
narrower: UDI
narrower: Coire Nan Easan Tuffs

Lossit Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAIL DOLO
has lithology component: DAIL MLMST
has obsolete equivalent: DAIL ISLL
broader: Blair Atholl Subgroup
narrower: PBUS
narrower: KELS
narrower: KNLS
narrower: Gleann Nan Gabhar Slate Member

Coire Daingean Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAIN
has current status: CURRENT
has theme: BEDRCK
notation: DAIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41909
has lithology component: DAIN CALSPL
has lithology component: DAIN SEMPG
has lithology component: DAIN SPQM
has source info: DAIN_51600
broader: Lochaber Subgroup
has additional age information: Neoproterozoic (Cryogenian).
has lower boundary definition: Change from white-weathering pinkish-brown quartzose psammite and quartzite of the preceding Beinn a'Chaisteil Quartzite Formation.
has geographical distribution: Recognized across northeastern parts of Sheet 46W (Crianlarich) west and north of Loch Lyon, also recognised northwest of Bridge Balgie Fault in upper Glen Lyon to Loch an Daimh in western part of Sheet 46E (Killin) and southwestern part of Sheet 54E (Loch Rannoch).
has lithology description: Formation comprises a lower calcareous semipelite unit succeeded by a massive schistose garnet-mica semipelite that constitutes the dominant lithology in the formation. The lower calcareous unit comprises 0 to 30m of calcareous garnet-mica schist and muscovite-quartz schist; extremely pitted weathering is conspicuous. The calcareous unit is succeeded by massive, poorly bedded garnet-mica schist and muscovite-quartz schist, poor in biotite but with abundant quartz sweats. Garnets are typically 1-2mm across, commonly chloritised and wrapped by muscovite. The unit is typically resistant to weathering and commonly forms brown-weathering cliffs 5 to 10m high.
has thickness description: Sections through the formation on Beinn a'Chaisteil and in Allt Coire an Lochain suggest of the order of 70m where not intensely folded. Contrast this with a thickness of at least 350m exposed in the back wall of Coire an Lochain on Beinn 'a Chreachain. In Coire Daingean the unit is 120 to 140m, again probably thickened by folding.
has upper boundary definition: Change to the alternating muscovite-rich semipelite, psammite and quartzite of the Beinn an Dothaidh Heterolithic Formation. A calcareous semipelite or calcsilicate-rock (c.5m thick) may be present at the base of the succeeding unit.

Kinlochlaggan Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DAKI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAKI DOLO
has lithology component: DAKI MLMST
broader: Coire Cheap Formation

Kintra Dolostone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAKL DOLO
has lithology component: DAKL MLMST
has obsolete equivalent: DAKL mn 2239
broader: Ballachulish Subgroup

Glen Egedale Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAKP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DAKP mn 1424
has obsolete equivalent: DAKP mn 2240
broader: Lochaber Subgroup

Kinlochlaggan Quartzite [Obsolete Code]
type: Concept
in scheme: NamedRockUnit
alternative label: DAKQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dalharco Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DAL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: DAL LMST
has source info: DAL_52783
broader: ULGS
has geographical distribution: South-central Ayrshire; type locality No.1 Borehole, Dalharco Colliery, northeast of Patna.

Dalness Breccias
type: Concept
in scheme: NamedRockUnit
alternative label: DALB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: TSIG

Dalby Group
type: Concept
in scheme: NamedRockUnit
alternative label: DALBY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41910
has lithology component: DALBY MDST
has lithology component: DALBY SDST
has lithology component: DALBY SLST
has source info: DALBY_50554
has source info: DALBY_51128
has source info: DALBY_51179
has source info: DALBY_51358
has source info: DALBY_52552
has obsolete equivalent: DALBY mn 2742
has obsolete equivalent: DALBY mn 2743
broader: NA
narrower: NBY
has lower boundary definition: Visible contacts are all faulted against the Manx Group and Peel Formation. It is likely that both lower and upper stratigraphical contacts are unconformable - the lower on the Manx Group where distinguished by being sandstone-dominated facies as opposed to a mudstone, the upper probably with overlying Permian or Triassic red-bed facies.
has geographical distribution: Isle of Man.
has lithology description: Sandstone (wacke), thin- to medium-bedded with interbedded siltstone and mudstone, locally including laminated carbonaceous siltstone and thin beds of meta-bentonite.
has thickness description: About 1200 m thick.
has upper boundary definition: Not seen, -see lower boundary details.

Loughros Group And Falcarragh Pelites (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DALF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Lismore Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DALL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DALL DOLO
has lithology component: DALL MLMST
has lithology component: DALL PEL
has lithology component: DALL PELGP
has lithology component: DALL SEMPEL
has obsolete equivalent: DALL st 486
broader: Blair Atholl Subgroup

Dargan Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DALM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Dalradian Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: DALN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: SG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DALN AMPHB
has lithology component: DALN BREC
has lithology component: DALN CALSIR
has lithology component: DALN MARBLE
has lithology component: DALN MBA
has lithology component: DALN MDOLR
has lithology component: DALN MGB
has lithology component: DALN MLAVA
has lithology component: DALN MLMST
has lithology component: DALN MTUF
has lithology component: DALN PEL
has lithology component: DALN PELGP
has lithology component: DALN PSAMM
has lithology component: DALN QZITE
has lithology component: DALN SEMPEL
has lithology component: DALN SEPITE
broader: NA
narrower: Quarff Succession And Melange
narrower: Scatsta 'Division'
narrower: Whiteness 'Division'
narrower: SOHI
narrower: OLLY
narrower: QYFH
narrower: VAFD
narrower: Grampian Group
narrower: Grampian Group And Appin Group (Undifferentiated)
narrower: Appin Group And Argyll Group (Undifferentiated)
narrower: Appin Group
narrower: Argyll Group
narrower: Clift Hills 'Division'
narrower: Saxa Vord Group
narrower: TROS

Lochaber Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DALO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Loch
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41911
has lithology component: DALO CALPL
has lithology component: DALO CALSIR
has lithology component: DALO PEL
has lithology component: DALO PSAMM
has lithology component: DALO QZITE
has lithology component: DALO SEMPEL
has source info: DALO_50001
has source info: DALO_51142
has source info: DALO_51764
has source info: DALO_52364
has source info: DALO_52497
has obsolete equivalent: DALO mn 1433
has obsolete equivalent: DALO mn 2466
broader: Appin Group
narrower: Beoil Quartzite Formation
narrower: Beoil Schist Formation
narrower: Cairnfield Calcareous Flag Formation
narrower: Beinn Dorain Semipelite Formation
narrower: Beinn An Dothaidh Formation
narrower: Dunalastair Quartzite Formation
narrower: Dunalastair Semipelite Formation
narrower: Fodderletter Calcareous Flag Formation
narrower: MEDP
narrower: SVQU
narrower: PCFL
narrower: Creeslough Formation
narrower: Glen Banvie Formation
narrower: Coire Daingean Semipelite Formation
narrower: Glen Egedale Slate Formation
narrower: Leven Schist Formation
narrower: Dalvrecht Slate Formation
narrower: Maol An Fhithich Quartzite Formation
narrower: Baddoch Burn Pelite Formation
narrower: LTSQ
narrower: SRGA
narrower: Beinn A'Chaisteil Quartzite Formation
narrower: Findlater Flag Formation
narrower: TOMA
narrower: Beoil Schist Formation And Meall Dubh Striped Pelite Formation (Undifferentiated)
narrower: Beinn Udlaidh Quartzite Formation
has lower boundary definition: Generally sharp transition from underlying Grampian Group, from monotonous psammites, generally flaggy, with thin quartzite and semipelite units to better sorted psammite or quartzite and semipelite or pelite.
has geographical distribution: Core of Islay antiform: Appin to Ballachulish; Loch Leven to Glen Spean; Kinlochlaggan; Strath Fionan to Baddoch Burn (very attenuated); Dufftown to Banffshire coast west of Sandend; Glenlivet, Derback, Inchrory area (Valley of River Avon).
has lithology description: Alternating units of psammite to quartzite and semipelite to pelite; in places becoming calcareous near the top of the Subgroup. Many of the finer-grained lithologies are flaggy, but in some places this may be a tectonic effect. Succession from Grampian Group into Lochaber Subgroup continuous in some areas, e.g. Schiehallion, Banffshire, but in Glen Spean there may be a tectonically modified unconformity at the base of the Leven Schist.
has thickness description: Variable locally 1500m where untectonised (Lochaber, Banffshire); in Schiehallion district thickness reduced to about 80m, but full succession can still be recognised.
has upper boundary definition: Incoming of more calcareous sediment, and more graphite in the pelitic and semipelitic rocks, indicating a decrease in the amount of input clastic material.

Leven Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DALS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DALS CALPL
has lithology component: DALS CALSIR
has lithology component: DALS DOLMST
has lithology component: DALS MARBLE
has lithology component: DALS PEL
has lithology component: DALS PELGP
has lithology component: DALS PSAMM
has lithology component: DALS QZITE
has lithology component: DALS SCHM
has lithology component: DALS SEMPEL
has lithology component: DALS SPPH
has obsolete equivalent: DALS mn 2357
broader: Lochaber Subgroup

Dalvrecht Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DALV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Lochaber Subgroup

Main Coal (Dailly)
type: Concept
in scheme: NamedRockUnit
alternative label: DAM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAM COAL
has lateral equivalent: DAM st 242
broader: LSC

Dalserf Mussel Band (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: DAMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Mullach Dubh Phyllite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAMD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Blair Atholl Subgroup

Maol An Fhithich Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAMF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAMF QZITE
has obsolete equivalent: DAMF mn 2744
broader: Lochaber Subgroup

Monadhliath Schist
type: Concept
in scheme: NamedRockUnit
alternative label: DAMS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Corrieyairack Subgroup

Dorset Anhydrite
type: Concept
in scheme: NamedRockUnit
alternative label: DANH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
broader: NE

Owengarve Calcareous Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAOF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Parrot Coal (Dailly)
type: Concept
in scheme: NamedRockUnit
alternative label: DAP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAP COAL
has lateral equivalent: DAP st 243
broader: LSC

Pale Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DAPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dallas Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAPS
has current status: CURRENT
has theme: BEDRCK
notation: TODU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41912
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41913
has lithology component: DAPS PSAMM
has lithology component: DAPS QZITE
has lithology component: DAPS SEMPEL
has source info: DAPS_50103
broader: Grampian Group
has lower boundary definition: Passes downwards into more mixed psammites and semipelites, locally gneissose. Possibly locally shear zone boundary. Onlap of Upper Devonian sediments obscures lower contacts in parts.
has geographical distribution: Stretches west from the Spey Valley around Rothes in an east-west swathe some 18 km wide at least as far as the Dorback Burn. Turns southwards and passes into the partly equivalent Nethybridge Psammite Formation. Overlain unconformably by Middle and Upper Devonian conglomerates and sandstones to the north. To the east truncated by the Rothes Fault, though possibly equivalent to some of the Grampian Group (undefined) psammites and quartzites farther east.
has lithology description: Pale grey, pink and white, flaggy to blocky, thin- to thick-bedded, siliceous and feldspathic psammite, locally with thin muscovite-rich beds and laminae. Subordinate quartzite beds common. Micaceous psammite and thin semipelite beds also present. Locally distinctive beds of interbanded psammitic and semipelitic gneiss, with quartz-feldspar augen and veins.
has thickness description: Up to 3000m, and possibly thicker.
has upper boundary definition: Passes up with gradational contact up into the Knockando Quartzite Formation over much of its outcrop. Truncated to the north-east by the Rothes Fault, and North-east of this structure possibly equivalent to undefined psammite and quartzite units within the Grampian Group.

Glencolumbkille Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DAQC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dark Slade Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAR
has current status: CURRENT
has theme: BEDRCK
notation: Dar
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41914
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41915
has lithology component: DAR LMST
has lithology component: DAR MDST
has lithology component: DAR SDST
has source info: DAR_48660
has source info: DAR_52583
has obsolete equivalent: DAR mn 3195
broader: Halesowen Formation
narrower: IL
has lower boundary definition: At base of mudstone-dominated succession resting on litharenites of lower Halesowen Formation; or at change of gamma log character.
has geographical distribution: Staffordshire, Shropshire, Warwickshire.
has lithology description: Mudstone with subordinate sublitharenite sandstones and thin beds of Spirorbis limestone. Colour grey with mottled grey/brown palaeosols (but may be reddened). Distinctive geophysical log character, with gamma peaks.
has thickness description: 40 to 90m; 60.5m in type section.
has upper boundary definition: At base of overlying Salop Formation. In places where Member is grey there is a change to orange-red colours. Boundary also marked by a change of gamma log character.

Darnley Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DARC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DARC COAL
broader: LSC

Dartry Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DARL
has current status: CURRENT
has theme: BEDRCK
notation: DARL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41916
has lithology component: DARL CHRT
has lithology component: DARL LMST
has lithology component: DARL SLMDST
has source info: DARL_52064
has source info: DARL_52183
has obsolete equivalent: DARL ULE
broader: TYRO
narrower: Carrickmacsparrow Limestone Member
narrower: Ballagh Limestone Member
narrower: KNM
narrower: Carn Limestone Member
narrower: Cloghan Hill Limestone Member
narrower: Cloghany Limestone Member
has lower boundary definition: Conformable and abrupt, planar or interdigitating with Glencar Limestone Formation.
has geographical distribution: Northwest Carboniferous basin of Ireland.
has lithology description: Limestone, dark grey, argillaceous, sparsely fossiliferous with disseminated chert in tabular or nodular form; interbedded with thin, dark grey to black silty, micaceous shale.
has thickness description: Up to 350m
has upper boundary definition: Disconformable with succeeding Meenymore Formation, locally erosional.

Dart Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DART
has current status: CURRENT
has theme: BEDRCK
notation: DA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41919
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41917
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41918
has lithology component: DART CESCH
has lithology component: DART PEL
has lithology component: DART PSAMM
has lithology component: DART PSAP
has lithology component: DART PSCHAC
has lithology component: DART SCH
has lithology component: DART SEMPEL
has lithology component: DART SPGR
has source info: DART_48834
has source info: DART_49400
has obsolete equivalent: DART mn 3771
has obsolete equivalent: DART mn 1219
broader: SOHI
narrower: Henry's Bridge Member
narrower: Glenga Amphibolite Member
has lower boundary definition: Conformably overlying rocks of the Dungiven Formation (q.v.)
has geographical distribution: Dart Mountain and South Sperrins, Co. Londonderry, Northern Ireland.
has lithology description: Medium-grained gritty psammites and intercalated slightly graphitic mica schist.
has thickness description: c.2.5km
has upper boundary definition: Overlain conformably by rocks of the Glenelly Formation (q.v.).

Darwin Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DARW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
broader: Dunlin Group

Dawlish Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DaS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41920
has lithology component: DAS BREC
has lithology component: DAS MDST
has lithology component: DAS SANDU
has lithology component: DAS SDST
has source info: DAS_48711
has source info: DAS_49275
has source info: DAS_49276
has source info: DAS_51044
has source info: DAS_52244
has source info: DAS_52247
has source info: DAS_52415
has source info: DAS_52555
has source info: DAS_52876
has obsolete equivalent: DAS mn 978
has obsolete equivalent: DAS mn 1226
has obsolete equivalent: DAS mn 1228
has obsolete equivalent: DAS mn 1225
has obsolete equivalent: DAS mn 1227
has obsolete equivalent: DAS mn 2663
broader: Exeter Group
narrower: Bussell's Member
narrower: POM
has lower boundary definition: South of Exminster, interdigitational with Heavitree Breccia. From Exminster to Monkerton (SX 970 940), sharp base on Heavitree Breccia or Monkerton Formation. North of Monkerton to near Broadclyst, rests unconformably on Crackington Formation. In Crediton Trough, rests on Shute Sandstone.
has geographical distribution: Extends from Dawlish in south through Topsham to Broad Clyst as c.3km-wide outcrop. In Crediton Trough, present between Brampford Speke in west to near Budlake in the east.
has lithology description: Reddish brown sands and sandstones, cross-bedded, with intercalated thin lenses and beds of breccia and mudstone. North of Broadclyst, two mappable units predominantly of mudstone have been named: Poltimore Mudstone and Bussell's Member.
has thickness description: 100-300m.
has upper boundary definition: Overlain sharply and probably unconformably by mudstones of the Aylesbeare Mudstone Group in the Exeter district; in the Newton Abbot district is overlain interdigitationally by the Exe Breccia.

Dalmary Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DASA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DAS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41921
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41922
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41923
has lithology component: DASA CONG
has lithology component: DASA MDST
has lithology component: DASA PESST
has lithology component: DASA SDST
has lithology component: DASA SLST
has source info: DASA_48873
has source info: DASA_49343
has source info: DASA_50005
has source info: DASA_50006
has source info: DASA_51673
has source info: DASA_51714
has source info: DASA_51878
has source info: DASA_51981
has source info: DASA_52835
has obsolete equivalent: DASA mn 1851
broader: THF
has lower boundary definition: A transitional contact, showing interbedding with the Cromlix Mudstone Formation, eg. in the Brocklin Falls Conglomerate Member in the Burn of Mar [NS 442 909], and locally a sharp contact, such as in Kelty Water [NS 5016 9503].
has geographical distribution: The north-west limb of the Strathmore Syncline, from Auchensail, Cardross [NS 342 798] to the southern slopes of Bheag near Callander, and as far as the Arrevore Burn [NN 775 126].
has lithology description: A greenish grey, fine- to coarse-grained, lithic sandstone, commonly with rip-up mudstone clasts, characterised by beds locally rich in plant remains.
has thickness description: Up to 1500 m thick.
has upper boundary definition: A transitional contact with the Buchlyvie Sandstone Member of the Teith Sandstone Formation, which is reddish grey, unfossiliferous and contains red siltstone and mudstone interbeds.

Clonmass Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DASC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DASC mn 3818
broader: NE

Dartford Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: DASI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41925
has lithogenesis: AEOLD
has lithogenesis: FLUV
has lithology component: DASI C
has lithology component: DASI CZ
has lithology component: DASI S
has lithology component: DASI Z
has lithology component: DASI ZC
has source info: DASI_50801
has source info: DASI_50918
has source info: DASI_52673
has obsolete equivalent: DASI mn 1221
broader: MNHD
has lower boundary definition: Mainly overlies or incises Boyn Hill Gravel Member or bedrock.
has geographical distribution: Dartford District.
has lithology description: Varies from silt to clay, commonly yellow-brown. Origin uncertain. Commonly includes a high percentage of wind-blown, silt-sized quartz (possibly loess). May also be "overbank" deposits or solifluction deposits. [Generic description].
has thickness description: 0.3 to 4.6m, commonly about 3m.
has upper boundary definition: At Surface or overlain by head deposits.

Ballachulish Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DASL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DASL PEL
has lithology component: DASL PELGP
has lithology component: DASL SEMPEL
has lithology component: DASL SLTE
has obsolete equivalent: DASL st 65
broader: Ballachulish Subgroup

Scatsta Pelitic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DASP
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41926
has lithology component: DASP SCH
has source info: DASP_51355
has source info: DASP_52539
has source info: DASP_52924
has obsolete equivalent: DASP mn 3762
has obsolete equivalent: DASP mn 3763
broader: Boundary Zone Complex
has lower boundary definition: Drawn at base of pelite of Scatsta Pelitic Formation where it rests conformably on psammite of the Yell Sound Division of the Moine.
has geographical distribution: Shetlands, Scotland.
has lithology description: Composed of mainly pelitic schists, some of which contain staurolite. Migmatisation is also present.
has thickness description: 1250m approx.
has upper boundary definition: Drawn at conformable upward passage from pelite of the Scatsta Pelitic Formation to quartzite of the Scatsta Quartzitic Formation.

Scatsta Quartzitic Formation [Obsolete Code: Use Scat]
type: Concept
in scheme: NamedRockUnit
alternative label: DASQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41927
has lithology component: DASQ QZITE
has lithology component: DASQ SCH
has source info: DASQ_51355
has source info: DASQ_52539
has source info: DASQ_52924
has obsolete equivalent: DASQ mn 3764
has obsolete equivalent: DASQ mn 3765
broader: DA
has lower boundary definition: Drawn at base of quartzite of the Scatsta Quartzitic Formation where it rests conformably on pelite of the Scatsta Pelitic Formation.
has geographical distribution: Shetland, Scotland.
has lithology description: Pure and impure quartzites interbanded with medium to fine-grained mica-schists.
has thickness description: 2750m approx.
has upper boundary definition: Drawn at conformable upward passage from pelite and quartzite of the Scatsta Quartzitic Formation to the Weisdale Limestone.

Dasses Sill
type: Concept
in scheme: NamedRockUnit
alternative label: DASS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
broader: MCPAS

Daugh Coal (Sanquhar)
type: Concept
in scheme: NamedRockUnit
alternative label: DAU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DAU COAL
broader: MCMS

Dava Succession
type: Concept
in scheme: NamedRockUnit
alternative label: DAVA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41928
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41929
has lithology component: DAVA AMPHB
has lithology component: DAVA PEL
has lithology component: DAVA PSAMI
has lithology component: DAVA PSAMM
has lithology component: DAVA QZITE
has lithology component: DAVA QZTGN
has lithology component: DAVA SEMPEL
has lithology component: DAVA SPELGN
has source info: DAVA_48667
has source info: DAVA_51802
has obsolete equivalent: DAVA CEHI
broader: Central Highland Migmatite Complex
narrower: Creag Buidhe Semipelite Formation
narrower: Flichity Semipelite Formation
narrower: SLCD
narrower: Beinn Bhreac Psammite
narrower: Flitchity Psammite Formation
has lower boundary definition: Not exposed.
has geographical distribution: Central Highlands of Scotland, Glen Bachor, and between Strathnairn and Grantown-on Spey.
has lithology description: Heterogenous succession of predominantly gneissose psammite, semipelite and subordinate quartzite.
has thickness description: Unknown.
has upper boundary definition: Sheared, tectonised or interpreted unconformable contact with overlying Grampian Group strata.

Davy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DAVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAVC COAL
broader: LSC

Dales Voe Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DAVO MLMST
has lithology component: DAVO QZITE
has obsolete equivalent: DAVO mn 1211
broader: Clift Hills Phyllitic Formation

Dailly Wee Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DAW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DAW COAL
broader: NE

Weisdale Limestone [Obsolete Code: Use Weil]
type: Concept
in scheme: NamedRockUnit
alternative label: DAWL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Whiteness 'Division'

Whiteness Limestone [Obsolete Code: Use Wnsl]
type: Concept
in scheme: NamedRockUnit
alternative label: DAWN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Whiteness 'Division'

Daylesford Member
type: Concept
in scheme: NamedRockUnit
alternative label: DAY
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: DAY GRAV
has lithology component: DAY SANDU
broader: TV

Aghyaran Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBAF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ardrishaig Phyllite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBAP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBAP MLMST
has lithology component: DBAP PEL
has lithology component: DBAP PELGP
has lithology component: DBAP PEPH
has lithology component: DBAP QZITE
has lithology component: DBAP SCHM
has lithology component: DBAP SEMPEL
has lithology component: DBAP SPPH
has lateral equivalent: DBAP st 224
has obsolete equivalent: DBAP st 42
has lateral equivalent: DBAP DBCP
broader: Easdale Subgroup

Asta Spilitic Formation [Obsolete Code: Use Assp]
type: Concept
in scheme: NamedRockUnit
alternative label: DBAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41481
has lithology component: DBAS METR
has source info: DBAS_51355
has source info: DBAS_52539
has source info: DBAS_52924
has obsolete equivalent: DBAS mn 158
has obsolete equivalent: DBAS mn 157
broader: Clift Hills 'Division'
has lower boundary definition: Drawn at base of metaspilite of the Asta Spilitic Formation where it rests conformably on the Laxfirth Limestone.
has geographical distribution: Shetlands, Scotland.
has lithology description: Metasedimentary phyllite along with hornblendic phyllites and coarse-grained hornblendic rocks.
has thickness description: 250m approx.
has upper boundary definition: Drawn at conformable upward passage from meta-spilite of the Asta Spilitic Formation to semi-pelite of the Clift Hills Phyllitic (Formation).

Didymograptus Bifidus Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has lithology component: DBB MDST
has lithology component: DBB TUF
is obsolete equivalent of: DBB ABGW
broader: NA
has lower boundary definition: Awaits modern stratigraphical study.
has geographical distribution: Not specified.
has lithology description: Grey silty graptolitic mudstones with thin tuffaceous horizons.
has thickness description: Unspecified
has upper boundary definition: Awaits modern stratigraphical study.

Bonahaven (Bunnahabhain) Dolomite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBBD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBBD MLMST
has lithology component: DBBD PEL
has lithology component: DBBD PSAMM
has obsolete equivalent: DBBD mn 523
broader: Islay Subgroup
narrower: Carraig Artair Member
narrower: MGAD
narrower: Bolsa Member
narrower: Glur-Bheinn Member

Boultypatrick Grit
type: Concept
in scheme: NamedRockUnit
alternative label: DBBG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Bonawe Succession
type: Concept
in scheme: NamedRockUnit
alternative label: DBBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBBS QZTPB
has lithology component: DBBS SLTE
broader: Easdale Subgroup

Double Coal Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DBC SDST
broader: NE

Upper Crana Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBCA mn 4361
broader: Crinan Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Creran Bridge Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBCB PEL
has lithology component: DBCB QZITE
broader: Islay Subgroup

Creagan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBCG MMST
has lithology component: DBCG MSDST
has lithology component: DBCG PEL
has lithology component: DBCG PELGP
has lithology component: DBCG QZITE
has lithology component: DBCG SEMPEL
has lithology component: DBCG SLST
has lithology component: DBCG SLTE
has obsolete equivalent: DBCG mn 1122
broader: Islay Subgroup

Cranford Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DBCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Carn Mairg Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: CMQ
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41482
has lithology component: DBCM AMPHB
has lithology component: DBCM CALSIR
has lithology component: DBCM PEL
has lithology component: DBCM PELGP
has lithology component: DBCM PSAMG
has lithology component: DBCM PSAMM
has lithology component: DBCM QZF
has lithology component: DBCM QZITE
has lithology component: DBCM QZTPB
has lithology component: DBCM SEMPEL
has lithology component: DBCM SPGR
has lithology component: DBCM VLSS
has source info: DBCM_49952
has source info: DBCM_50001
has source info: DBCM_50024
has source info: DBCM_51142
has source info: DBCM_51365
has source info: DBCM_52396
has obsolete equivalent: DBCM mn 796
broader: Easdale Subgroup
has lower boundary definition: First appearance of massive pebbly quartzite within 80m transition zone from impure quartzites and semipelites of Killiecrankie Schist Formation.
has geographical distribution: From Creag Sparadain [NN 968 653], where it is cut off by the Killiecrankie Slide, southwards via the north side of Beinn Eagagach [NN 855 575] and Carn Mairg [NN 683 515], to Loch Awe [NN 11 26], where it is cut off by the Etive Complex.
has lithology description: Massive white pebbly quartzite and rusty gritty psammite, with local pink feldspathic quartzite and calcareous semipelite.
has thickness description: 0 - 900m in Sheet 55W
has upper boundary definition: Point within transitional sequence where micaceous, graphitic pelite typical of Ben Eagach Schist Formation dominates over quartzite.

Crinan Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DBCN
has current status: CURRENT
has theme: BEDRCK
notation: Crin
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41483
has lithology component: DBCN CALSIR
has lithology component: DBCN LMST
has lithology component: DBCN PEL
has lithology component: DBCN PSAMM
has lithology component: DBCN QZITE
has lithology component: DBCN SEMPEL
has source info: DBCN_48890
has source info: DBCN_50001
has source info: DBCN_50024
has source info: DBCN_51142
has source info: DBCN_52589
broader: Argyll Group
narrower: Caenlochan Schist Formation
narrower: INZ
narrower: Cowhythe Psammite Formation
narrower: QH
narrower: Ardmore Formation
narrower: Ben Challum Quartzite Formation
narrower: DBAG
narrower: Upper Crana Quartzite Formation
narrower: Lower Crana Quartzite Formation
narrower: Crinan Grit Formation
narrower: Erins Quartzite Formation
narrower: Killeter Quartzite Formation
narrower: Stonefield Schist Formation
narrower: Upper Erins Quartzite Formation
narrower: Ben Lui Schist Formation
has lower boundary definition: Incoming of coarse pebbly quartzite or psammite at base of Crinan Grit or Upper Erins Quartzite (Argyll); change from calcareous pelite or volcaniclastic rocks to non-calcareous turbiditic semipelite, pelite and psammite (Perthshire to Banffshire).
has geographical distribution: Connemara; North Mayo; Donegal; Newtown Stewart to east of Strabane; Armoy to Torr Head; Kintyre, Knapdale; Crinan to Loch Awe; from Loch Fyne, via Tyndrum, Loch Tay, Loch Tummel, Glen Shee, Deeside, Donside and Ladder Hills to the coast from Aberdeen to Ellon, Peterhead to Fraserburgh, and Portsay to Boyne Bay.
has lithology description: Coarse-grained quartzite present in Argyll at base of subgroup; upper part of subgroup in Argyll and whole of subgroup elsewhere formed of interbedded semipelite and pelite with minor psammite - this facies denotes the commencement of deep-water turbiditic sedimentation. Gritty psammite and semipelite near top in Glen Dochart - Kikin.
has thickness description: 1.5-3km
has upper boundary definition: Bottom of lowest limestone bed in Loch Tay Limestone Formation where present; from Glen Clova to Deeside change from dominant semipelite to psammite or quartzite with calcareous beds.

Craignish Phyllite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBCP PEL
has lithology component: DBCP SEMPEL
has lateral equivalent: DBCP st 42
has obsolete equivalent: DBCP st 224
has lateral equivalent: DBCP DBAP
broader: Easdale Subgroup

Lower Crana Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBCQ mn 2555
broader: Crinan Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Crinan Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBCR MLMST
has lithology component: DBCR PEL
has lithology component: DBCR QZITE
has obsolete equivalent: DBCR mn 1134
broader: Crinan Subgroup

Croaghubrid Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBCS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBCS mn 1139
broader: NE

Crinan Subgroup And Tayvallich Subgroup (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DBCT
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBCT BA
has lithology component: DBCT CALSIR
has lithology component: DBCT LMST
has lithology component: DBCT PEL
has lithology component: DBCT PSAMM
has lithology component: DBCT QZITE
has lithology component: DBCT SEMPEL
broader: Argyll Group

Culdaff Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DBCU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Creran Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBDF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBDF MMST
has lithology component: DBDF MSDST
has lithology component: DBDF PEL
has lithology component: DBDF QZITE
has lithology component: DBDF SEMPEL
broader: Islay Subgroup

Dungiven Formation (A) [Obsolete Code: Use Dunn]
type: Concept
in scheme: NamedRockUnit
alternative label: DBDI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE
has supplementary information: The bracketed letter (A) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Degnish Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBDL DOLO
has lithology component: DBDL MLMST
has obsolete equivalent: DBDL mn 1235
broader: Easdale Subgroup

Dunrossness Phyllitic Formation [Obsolete Code: Use Duph]
type: Concept
in scheme: NamedRockUnit
alternative label: DBDP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41484
has lithology component: DBDP METR
has lithology component: DBDP QZITE
has source info: DBDP_51099
has source info: DBDP_52539
has source info: DBDP_52924
has obsolete equivalent: DBDP mn 1363
has obsolete equivalent: DBDP mn 1364
broader: DB
has lower boundary definition: Drawn at base of pelitic wacke interpreted to belong to the Dunrossness Phyllitic (Formation) where it rests conformably on pelite and semi-pelite interpreted to belong to the Clift Hills Phyllitic (Formation).
has geographical distribution: Shetlands, Scotland.
has lithology description: Chlorite-chloritoid phyllite containing a few thin bands of quartzite. Kyanite occurs in quartz segregations and staurolite in metamorphic aureoles.
has thickness description: 750m approx.
has upper boundary definition: Drawn at conformable upward passage from pelitic wacke interpreteted to belong to the Dunrossness Phyllitic (Formation), to meta-spilite of the Dunrossness Spilitic Formation.

Durn Hill Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBDQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DuQu
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41485
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41486
has lithology component: DBDQ MDIAMT
has lithology component: DBDQ PSAMG
has lithology component: DBDQ PSAMI
has lithology component: DBDQ PSAMM
has lithology component: DBDQ QZITE
has lithology component: DBDQ SEMPEL
has source info: DBDQ_48670
has source info: DBDQ_49235
has source info: DBDQ_50001
has source info: DBDQ_51142
has obsolete equivalent: DBDQ mn 4436
has lateral equivalent: DBDQ KYQU
broader: Islay Subgroup
has lower boundary definition: Change from interbedded psammite and semipelite of Arnbath Formation, where present, or pelite and limestone of Fordyce Limestone Formation, to thicker-bedded quartzite.
has geographical distribution: Coast section from 150m southeast of Foul Hole to John Legg's Well [NJ 579 666 to 580 665]; extends southwards as far as Braco [NJ 498 512]. Equivalent to the Kymah Quartzite farther south.
has lithology description: Quartzite, massive to blocky, locally feldspathic. Micaceous quartzite at base in southern part of outcrop.
has thickness description: c.400m on Durn Hill, thinning to c.150m at coast. Probably repeated by folding and thrusting on Knock Hill and farther south.
has upper boundary definition: Rapid transition to pelite (graphitic near coast) at base of Castle Point Pelite Formation.

Deeside Limestone [Obsolete Code: Use Dli]
type: Concept
in scheme: NamedRockUnit
alternative label: DBDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dungiven Formation (B) [Obsolete Code: Use Dunn]
type: Concept
in scheme: NamedRockUnit
alternative label: DBDU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBDU mn 1351
broader: NE
has supplementary information: The bracketed letter (B) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Dales Voe Grit [Obsolete Code: Use Davo]
type: Concept
in scheme: NamedRockUnit
alternative label: DBDV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

D-Bed Evaporite
type: Concept
in scheme: NamedRockUnit
alternative label: DBE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: DBE GYPST
has obsolete equivalent: DBE mn 3294
broader: Eden Shales Formation

Easdale Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DBED
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Eas
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41487
has lithology component: DBED AMPHB
has lithology component: DBED BA
has lithology component: DBED CALSIR
has lithology component: DBED CONG
has lithology component: DBED MLMST
has lithology component: DBED PEL
has lithology component: DBED PELGP
has lithology component: DBED PSAMM
has lithology component: DBED QZITE
has lithology component: DBED SEMPEL
has lithology component: DBED VLSS
has source info: DBED_50001
has source info: DBED_50024
has source info: DBED_50025
has source info: DBED_51142
has source info: DBED_52589
broader: Argyll Group
narrower: SCCO
narrower: Ben Eagach Schist Formation
narrower: Castle Point Pelite Formation
narrower: Cairn Of Claise Transition Formation
narrower: Creag Nam Ban Psammite Formation
narrower: MEDB
narrower: SLLE
narrower: SWPH
narrower: PEPH
narrower: LMGR
narrower: Culchavie Striped Formation
narrower: PTSL
narrower: KRCM
narrower: UMMN
narrower: STPH
narrower: Auchlyne Formation
narrower: Carrick O'Hara Formation
narrower: REEL
narrower: REPS
narrower: Farragon Volcanic Formation
narrower: Ardrishaig Phyllite Formation
narrower: Bonawe Succession
narrower: Carn Mairg Quartzite Formation
narrower: Craignish Phyllite Formation
narrower: Degnish Limestone Formation
narrower: Easdale Slate Formation
narrower: Killiecrankie Schist Formation
narrower: Lower Erins Quartzite Formation
narrower: Laphroaig Quartzite Formation
narrower: Termon Formation
narrower: St Catherines Graphitic Schist
narrower: Shira Limestone And Slate Formation
narrower: Badenyon Schist And Limestone Formation
narrower: Ben Lawers Schist Formation
narrower: Glen Girnock Calcareous Formation
narrower: Glenbuchat Graphitic Schist Formation
has lower boundary definition: Abrupt transition from quartzite to graphitic pelite (Jura, Easdale) or mixed semipelite, pelite and psammite (Perthshire).
has geographical distribution: Connemara; North Mayo; Donegal; Jura, Knapdale and Mid-Argyll; from Loch Fyne, via Tyndrum, Loch Tay, Loch Tummel, Glen Shee, Deeside, Donside and Ladder Hills to the Moray firth coast from Portsoy to Boyne Bay.
has lithology description: Semipelite and pelite, the pelitic lithologies graphitic in lower part and calcareous in upper part, with pebbly quartzite developed in part of succession over wide areas; volcaniclastic formation locally present at top of subgroup.
has thickness description: Up to 3km
has upper boundary definition: Top of Farragon Volcanic Formation in Perthshire; base of Crinan Grit or Upper Erins Quartzite in Argyll.

Erins Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBEQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lateral equivalent: DBEQ st 230
has obsolete equivalent: DBEQ mn 1466
broader: Crinan Subgroup

Easdale Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBES MLMST
has lithology component: DBES PELGP
has lithology component: DBES QZITE
has obsolete equivalent: DBES mn 1395
broader: Easdale Subgroup

Devil's Bridge Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: DBF AROC
has lithology component: DBF SDST
has obsolete equivalent: DBF mn 2846
has obsolete equivalent: DBF mn 2564
broader: NA
narrower: LDB
narrower: DMF
narrower: UDB
narrower: MDB
has geographical distribution: Aberystwyth area, west Wales.

Dinas Bran Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41488
has lithology component: DBG MDST
has source info: DBG_52222
has source info: DBG_52836
has obsolete equivalent: DBG mn 1261
has obsolete equivalent: DBG mn 1260
broader: NA
has lower boundary definition: Overlie Vivod Group (or M. Leintwardinensis Beds) of Wills and Smith, 1922. Junction not seen. Vivod Group consists of thinly bedded flaggy mudstones.
has geographical distribution: Between Llangollen and Pontcysyllte, Dee Valley (Vale of Llangollen) Clwyd.
has lithology description: Mudstones, sandy, slightly calcareous, micaceous, thinly bedded, uncleaved.
has thickness description: Up to about 225 m thick.
has upper boundary definition: None - occurs in the core of the Llangollen Syncline.

Durbog Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DBGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DBGC COAL
broader: NE

Glendaruel Limestone [= Loch Tay Limestone]
type: Concept
in scheme: NamedRockUnit
alternative label: DBGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Gaughin Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBGQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Islay Subgroup
has geographical distribution: Donegal.

Derbyhaven Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: DBH CST
has lithology component: DBH LMST
has lithology component: DBH SLST
has source info: DBH_51431
has obsolete equivalent: DBH mn 1244
broader: Great Scar Limestone Group
narrower: SKIL
narrower: SWIK
narrower: TURK
has geographical distribution: Southern Isle of Man
has thickness description: The formation is more than 90m thick (Chadwick et al., 2001).

Dibhole Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DBHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DBHC COAL
broader: PLCM
has lithology description: The Dib Hole Coal is a thin impersistent seam that is of no economic importance. Its significance lies in its association with the Dib Hole Marine Band and the top of the Grenoside Sandstone Cycle (Chisholm, 1990).

Clift Hills Phyllite Group [Obsolete Code: Use Clhi]
type: Concept
in scheme: NamedRockUnit
alternative label: DBHP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41489
has lithology component: DBHP CSSST
has lithology component: DBHP QZITE
has lithology component: DBHP SEMPEL
has source info: DBHP_52539
has obsolete equivalent: DBHP mn 958
broader: NE
has lower boundary definition: Drawn at base of pelite and semi-pelite of the Clift Hills Phyllitic Group where it rests conformably on meta-spilite of the Asta Spilitic Group.
has geographical distribution: Shetlands, Scotland.
has lithology description: Colour banded semi-pelitic phyllite with intercalations of quartzite. Laminated phyllites contain muscovite and some are graphitic. Thick units of coarse, feldspathic grit occur.
has thickness description: 2300m approx.
has upper boundary definition: Drawn at conformable upward passage from semi-pelite and pelite of the Clift Hills Phyllitic Group to pelitic wacke of the Dunrossness Phyllitic Group.

Dalmellington Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DBI CBFEST
has lithology component: DBI FEST
broader: LCMS

Islay Quartzite
type: Concept
in scheme: NamedRockUnit
alternative label: DBIQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBIQ QZITE
has lithology component: DBIQ QZTD
has lithology component: DBIQ SEMPEL
broader: Islay Subgroup

Islay Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DBIS
has current status: CURRENT
has theme: BEDRCK
notation: Isly
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41491
has lithology component: DBIS DIAMIT
has lithology component: DBIS DOLMST
has lithology component: DBIS PEL
has lithology component: DBIS PSAMI
has lithology component: DBIS PSAMM
has lithology component: DBIS QZITE
has lithology component: DBIS SEMPEL
has source info: DBIS_49994
has source info: DBIS_50001
has source info: DBIS_50024
has source info: DBIS_51142
has source info: DBIS_52576
has source info: DBIS_52589
broader: Argyll Group
narrower: SALA
narrower: Beinn Donn Quartzite Formation
narrower: JUQU
narrower: KYQU
narrower: LAHI
narrower: LAN
narrower: Creag Leacach Quartzite Formation
narrower: NSAL
narrower: Beinn Churalain Quartzite
narrower: Arnbath Psammite Formation
narrower: Bonahaven (Bunnahabhain) Dolomite Formation
narrower: Creran Bridge Quartzite Formation
narrower: Creagan Formation
narrower: Creran Flags Formation
narrower: Durn Hill Quartzite Formation
narrower: Gaughin Quartzite Formation
narrower: Islay Quartzite
narrower: Port Askaig Tillite Formation
narrower: Slieve Tooey Quartzite Formation
narrower: Schiehallion Quartzite Formation
narrower: Schiehallion Boulder Bed Formation
has lower boundary definition: Generally transitional over a few metres at base of tillite of Port Askaig (Schiehallion) Boulder Bed.
has geographical distribution: Connemara; North Mayo; Donegal; Islay, Jura, from Loch Rannoch to Glen Tilt, from near Spittal of Glen Shee via Upper Deeside, Donside and Ladder Hills to the coast between Sandend and Portsoy.
has lithology description: Diamictite ('Boulder Bed') with limestone clasts in its lower part and quartzite and granite clasts in upper part attains maximum thickness in Port Askaig area and on Garvellachs; overlying quartzite reaches 5km in thickness on Jura but is more usually 0.5 - 1km thick; dolomitic beds are locally developed near base of quartzite. In Ladder Hills area graded psammites and semipelites intervene between diamictite and quartzite.
has thickness description: Up to 5km
has upper boundary definition: Abrupt transition from quartzite to graphitic pelite (Easdale) or mixed psammite, semipelite and pelite (Perthshire).

Jura Quartzite [Obsolete Code: Use Juqu]
type: Concept
in scheme: NamedRockUnit
alternative label: DBJQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Jura Slate [Obsolete Code: Use Jusl]
type: Concept
in scheme: NamedRockUnit
alternative label: DBJS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Limestone Of Jura-Tayvallich Succession
type: Concept
in scheme: NamedRockUnit
alternative label: DBJT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Kilchrenan Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBKC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBKC MCONG
has obsolete equivalent: DBKC mn 2212
broader: Tayvallich Subgroup

Kinnairds Head Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBKH
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41492
has lithology component: DBKH CALSIR
has lithology component: DBKH CSSST
has lithology component: DBKH MARBLE
has lithology component: DBKH SEMPEL
has lithology component: DBKH WACKE
has source info: DBKH_51355
has source info: DBKH_52204
has obsolete equivalent: DBKH mn 2237
broader: Argyll Group
has lower boundary definition: Drawn at base of quartzite of the Kinnairds Head Formation where it rests conformably on quartzite of the Mormond Hill Quartzite.
has geographical distribution: Grampian, Scotland.
has lithology description: Grit, greywacke, semi-pelite with some calc-silicate rock and rare marble.
has thickness description: Not known.
has upper boundary definition: Drawn at conformable upward passage from limestone and semi-pelitic wacke of the Kinnairds Head Formation to semi-pelitic wacke of the Rosehearty Group.

Dalla Bank Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DBKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DBKL LMST
has source info: DBKL_51867
has lateral equivalent: DBKL st 244
broader: Alston Formation

Killeter Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBKQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBKQ mn 2220
broader: Crinan Subgroup
has geographical distribution: Donegal.
has thickness description: 0 to 1100m

Killiecrankie Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBKR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: KicS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41493
has lithology component: DBKR AMPHB
has lithology component: DBKR PEL
has lithology component: DBKR PSAMG
has lithology component: DBKR PSAMI
has lithology component: DBKR PSAMM
has lithology component: DBKR QZITE
has lithology component: DBKR SEMPEL
has lithology component: DBKR VLSS
has source info: DBKR_49952
has source info: DBKR_50001
has source info: DBKR_50024
has source info: DBKR_51142
has source info: DBKR_51365
has source info: DBKR_52396
has obsolete equivalent: DBKR mn 2221
broader: Easdale Subgroup
has lower boundary definition: Change from fine-grained quartzite of Schiehallion Quartzite Formation to dark, layered semipelite and thin-bedded psammite containing 0.08m layers of fine-grained garnet-amphibolite.
has geographical distribution: From Carn Liath [NN 994 666], where it is cut off by the Killiecrankie Slide, southwards to Kinloch Rannoch [NN 659 576]. to the west of this, it is cut off by the Schiehallion Slide.
has lithology description: Pelite, semipelite and psammite, well-bedded, usually garnetiferous, locally slightly graphitic and kyanite-bearing. Cross-bedding developed at lower boundary; includes quartzite beds in A9 section near Killiecrankie.
has thickness description: 0 - 900m in Sheet 55W
has upper boundary definition: First appearance of massive pebbly quartzite of Carn Mairg Quartzite Formation within 80m transition zone from impure quartzites and semipelites of Killiecrankie Schist Formation.

Killeter Quartzite Formation [Obsolete Code: Use Dbkq]
type: Concept
in scheme: NamedRockUnit
alternative label: DBKT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBKT CESCH
has lithology component: DBKT PSAMM
has lithology component: DBKT QZITE
broader: NE
has geographical distribution: Donegal.
has thickness description: 0 to 1100m

Danny Bridge Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DBL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DBL LMST
has lithology component: DBL MDST
has lithology component: DBL SLST
has source info: DBL_48662
has source info: DBL_51476
broader: Great Scar Limestone Group
has additional age information: Late Asbian.

Disturbed Blackheath Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DBLB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has lithology component: DBLB GRAV
has lithology component: DBLB SANDU
has lateral equivalent: DBLB st 193
is obsolete equivalent of: DBLB CHGR
broader: NE

Loch Na Cille Boulder Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DBLC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Tayvallich Limestone Formation

Lower Erins Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBLE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBLE MLMST
has lithology component: DBLE PEL
has lithology component: DBLE QZITE
has lithology component: DBLE SEMPEL
has obsolete equivalent: DBLE mn 2573
broader: Easdale Subgroup

Laxfirth Limestone [Obsolete Code: Use Laxf]
type: Concept
in scheme: NamedRockUnit
alternative label: DBLL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBLL LMST
broader: Whiteness 'Division'

Douglas Bridge Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DBLM
has current status: CURRENT
has theme: BEDRCK
notation: DBLM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41494
has lithology component: DBLM LMST
has lithology component: DBLM MDST
has lithology component: DBLM SDST
has lithology component: DBLM SLST
broader: Barony Glen Formation
has lower boundary definition: Base of limestones and calcareous mudstones overlying fluvial sandstones, siltstones and mudstones of the Barony Glen Formation.
has geographical distribution: Newtownstewart Basin, Sperrin Mountains, County Tyrone, Northern Ireland.
has lithology description: Micritic limestone, pale grey, laminated and nodular. Algal mat stromatalites and sparse, marine, shelly fauna. Limestones interbedded with calcareous mudstone, siltstone and sandstone.
has thickness description: 140m
has upper boundary definition: Uppermost limestone overlain by fluvial sandstones, siltstones and mudstones of the Barony Glen Formation.

Laphroaig Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBLQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBLQ QZITE
has obsolete equivalent: DBLQ mn 2326
broader: Easdale Subgroup

Lough Esk Psammites
type: Concept
in scheme: NamedRockUnit
alternative label: DBLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Lower Whitehills Group
type: Concept
in scheme: NamedRockUnit
alternative label: DBLW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41495
broader: NE
has lower boundary definition: drawn at base of phyllites of whitehills group where it rests conformably on the boyne limestone.
has geographical distribution: grampian,scotland.
has lithology description: dark,flaggy quartzites,purple quartzose phyllites.white limestones.calcareous flags and pebbly grits.(correlative of whitchells group-pelitic group and upper psammitic group).
has thickness description: not defined.
has upper boundary definition: drawn at conformable upward passage from pebbly grit of the whitehills group to andalusite schists of the boynaie bay group.

Murlough Bay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBMF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
is obsolete equivalent of: DBMF MUSH
broader: NE

Mormond Hill Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DBMH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBMH PEL
has lithology component: DBMH PSAMM
has lithology component: DBMH QZITE
has lithology component: DBMH SEMPEL
broader: SN

Termon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBMI mn 4140
has obsolete equivalent: DBMI mn 4139
broader: Easdale Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Dippal Burn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DBN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41496
has lithology component: DBN MDST
has lithology component: DBN SDST
has lithology component: DBN SLMDST
has lithology component: DBN SLST
has source info: DBN_48677
has source info: DBN_52494
broader: WHD
has lower boundary definition: Sharp boundary on sandstones of Birkenhead Sandstone.
has geographical distribution: Muirkirk to Strathaven area, Strathclyde region, Central Scotland.
has lithology description: Dark greenish grey shaly mudstones in lower part, overlain by greenish grey sandstones, siltstones and silty mudstones.
has thickness description: 70m
has upper boundary definition: Transition to reddish-grey sandstones and siltstones of Monument Formation.

Newtownstewart Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBNF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dogger Bank Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBNK
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BD
has predominant age: BD
has youngest age: BD
broader: NE

Owencam Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBOF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Port Ellen Phyllite [Obsolete Code: Use Peph]
type: Concept
in scheme: NamedRockUnit
alternative label: DBPE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Port Askaig Tillite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBPT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBPT MDIAMT
has lithology component: DBPT QZITE
has lithology component: DBPT SEMPEL
has obsolete equivalent: DBPT mn 3359
broader: Islay Subgroup
narrower: Beannan Buidhe Member
narrower: Creagan Loisgte Member
narrower: Con Tom Member
narrower: An Tamhanachd Member
narrower: An Tamhanachd Member And Beannan Buidhe Member (Undifferentiated)
narrower: RUPB

Doweel Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DBr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41498
has lithology component: DBR BREC
has lithology component: DBR SDST
has lithology component: DBR SLST
has source info: DBR_52156
has obsolete equivalent: DBR mn 821
has obsolete equivalent: DBR mn 1111
broader: STEW
has lower boundary definition: Interdigitates with and overlies the Locharbriggs Sandstone Formation.
has geographical distribution: Mainly on the western side of the Dumfries Basin.
has lithology description: Interbedded breccias, fluviatile and aeolian sandstones; rare siltstones present at lower horizons.
has thickness description: >200m
has upper boundary definition: Forms the top of the Permian sequence in the Dumfries Basin.

Dee Bridge Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DBS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: DBS SDST
is obsolete equivalent of: DBS CFS
broader: Cefn-Y-Fedw Sandstone Formation
has lithology description: Yellow sandstone with plant remains.

Scarba Conglomerate [Obsolete Code: Use Scco]
type: Concept
in scheme: NamedRockUnit
alternative label: DBSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

St Catherines Graphitic Schist
type: Concept
in scheme: NamedRockUnit
alternative label: DBSG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBSG PELGP
broader: Easdale Subgroup

Shira Limestone And Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBSL DOLO
has lithology component: DBSL MLMST
has obsolete equivalent: DBSL mn 3848
broader: Easdale Subgroup

Slieve Tooey Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBSO
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBSO mn 3895
broader: Islay Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Schiehallion Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBSQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SchQ
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41499
has lithology component: DBSQ DOLMST
has lithology component: DBSQ MCONG
has lithology component: DBSQ MDOLO
has lithology component: DBSQ QZITE
has lithology component: DBSQ SCH
has lithology component: DBSQ SEMPEL
has source info: DBSQ_49952
has source info: DBSQ_50001
has source info: DBSQ_50024
has source info: DBSQ_51142
has source info: DBSQ_51365
has source info: DBSQ_52396
has obsolete equivalent: DBSQ st 735
has obsolete equivalent: DBSQ mn 3768
broader: Islay Subgroup
narrower: TEDO
has lower boundary definition: Sharp change from diamictite of Boulder Bed to fine-grained well-bedded quartzite. However, a 10-20m bed of reworked granite diamictite occurs near the base of the Schiehallion Quartzite Formation on Cnocnan Aighean [NN 7292 5551].
has geographical distribution: From 1km north-east of Forest Lodge, where it pinches out in a tight fold core, southwards to the north shore of Loch Tummel and Loch Kinardochy via Schiehallion to the north-west side of Beinn a Chuallaich. West of this it is cut off by Schiehallion Slide.
has lithology description: Quartzite, white to grey, fine-grained. The upper half of the formation is especially pure and glassy, with little feldspar or mica. Includes Tempar Dolomitic Member and some beds of conglomerate.
has thickness description: 0 - 800m in Sheet 55W (most thinning is tectonic).
has upper boundary definition: Sharp (<10m) change from fine-grained quartzite of Shiehallion Quartzite Formation to dark, layered semipelite and thin-bedded psammite containing 8cm layers of fine-grained garnet-amphibolite.

Stonefield Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBSS PEL
has lithology component: DBSS SEMPEL
has obsolete equivalent: DBSS mn 4014
broader: Crinan Subgroup

Schiehallion Boulder Bed Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SchB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41500
has lithology component: DBST DIAMIT
has lithology component: DBST MCONG
has lithology component: DBST MDIAMT
has lithology component: DBST PSAMM
has lithology component: DBST QZITE
has source info: DBST_49952
has source info: DBST_50001
has source info: DBST_50024
has source info: DBST_51142
has source info: DBST_51365
has source info: DBST_52396
has obsolete equivalent: DBST mn 3767
has obsolete equivalent: DBST mn 3769
broader: Islay Subgroup
has lower boundary definition: Gradation from biotite calc-pelite to calcareous diamictite over 10m.
has geographical distribution: From east end of Loch Errochty [NN 7190 6609] to Loch Kinardochy [NN 775 550] west of Loch Tay Fault; around Loch Tummel [NN 833 596] and at Kirkton of Lude [NN 900 690], east of Loch Tay Fault.
has lithology description: Lower part: Calcareous diamictite with dominantly calcareous clasts. Central part: Schistose and feldspathic psammite and quartzite (discontinuous). Upper part: Quartz-rich diamictite with dominantly granite and quartzite clasts.
has thickness description: 0 - 250m in Sheet 55W
has upper boundary definition: Sharp contact between quartzose diamictite and thinly-bedded quartzite. However, 10 - 20m bed of reworked granite diamictite occurs near base of Schiehallion Quartzite Formation on Cnoc nan Aighean.

Duddon Bridge Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DBT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DBT
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41501
has lithology component: DBT ANLTUF
has source info: DBT_49785
has source info: DBT_51787
has obsolete equivalent: DBT mn 1336
broader: WB
has lower boundary definition: Base of andesitic lapilli-tuff succession. Usually rests on brecciated top of Barrow Tuff Member.
has geographical distribution: Between Ulpha Park (SD 187 910) and Duddon Bridge (SD 196 882), near Broughton in Furness, Cumbria.
has lithology description: Andesitic lapilli-tuff, massive.
has thickness description: c.250m excluding basaltic andesite sill (130m)
has upper boundary definition: Defined by base of overlying Duddon Hall Formation - parallel bedded andesitic tuff.

Drigg Beach Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: DBTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41502
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41503
has lithology component: DBTI DMTN
has source info: DBTI_49633
has source info: DBTI_50151
has source info: DBTI_51057
has source info: DBTI_51754
broader: Gosforth Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: Generally planar subhorizontal unconformity generally on the Kirkland Wood Sand and Gravel Member of the Gosforth Glacigenic Formation.
has geographical distribution: 1:50k Sheet 37 Gosforth, Drigg area, Western Cumbria.
has lithology description: Dusky red stiff plastic silty and clayey diamicton with well dispersed sand grains and angular clasts (up to 30mm) of Borrowdale Volcanic Group rocks, Skiddaw Group siltstones and sandstones; some granite, red and white sandstone; sparse shell fragments. Rip-up clasts of underlying units common.
has thickness description: 1.07m thick at its type section.
has upper boundary definition: Overlain by the erosional base of the Drigg Holm Sand Member of the Gosforth Glacigenic Formation and by Holocene peat in a hollow on the foreshore at Barn Scar.

Tayvallich Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBTL DOLO
has lithology component: DBTL MLMST
has obsolete equivalent: DBTL mn 4121
broader: Tayvallich Subgroup
narrower: Loch Na Cille Boulder Bed

Torr Head Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBTR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DBTR mn 4227
broader: Tayvallich Subgroup

Tayvallich Slate And Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBTS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBTS MLMST
has lithology component: DBTS PEL
has lithology component: DBTS PELGP
has lithology component: DBTS VCBR
has obsolete equivalent: DBTS mn 4122
broader: Tayvallich Subgroup

Tayvallich Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DBTV
has current status: CURRENT
has theme: BEDRCK
notation: Tayv
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: WIDER
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41504
has lithology component: DBTV BA
has lithology component: DBTV CALSIR
has lithology component: DBTV LMST
has lithology component: DBTV PEL
has lithology component: DBTV PSAMM
has lithology component: DBTV SEMPEL
has source info: DBTV_50001
has source info: DBTV_50024
has source info: DBTV_51142
has source info: DBTV_52589
has source info: DBTV_52857
has obsolete equivalent: DBTV mn 4120
broader: Argyll Group
narrower: Deeside Limestone Formation
narrower: Dounalt Limestone Formation
narrower: Dungiven Formation
narrower: SN
narrower: Craigievar Formation
narrower: WATL
narrower: LTAY
narrower: Boyne Limestone Formation
narrower: Kilchrenan Conglomerate Formation
narrower: Tayvallich Limestone Formation
narrower: Torr Head Limestone Formation
narrower: Tayvallich Slate And Limestone Formation
narrower: TPS
has lower boundary definition: Bottom of lowest limestone bed in Loch Tay Limestone Formation where present; from Glen Clova to Deeside change from dominant semipelite to psammite or quartzite with calcareous beds.
has geographical distribution: Connemara; North Mayo; Donegal; Newtown Stewart to east of Strabane; Armoy to Torr Head; Kintyre, Tayvallich Peninsula; Loch Awe; from Loch Fyne, via Tyndrum, Loch Tay, Loch Tummel, Glen Shee, Deeside, Donside and Moray Firth coast at Boyne Bay - Whitehills.
has lithology description: Dominated by calcitic limestone, in part slumped, resedimented; however, east of mid-Deeside the limestone is replaced by psammite and quartzite with thin beds of calcsilicate rock; lavas, hyaloclastites and graphitic pelites present in Tayvallich area; Banffshire Coast - thick semipelite and calc sequence in upper part.
has thickness description: Generally 100-250m, but in Aberdeenshire and Banffshire where semipelitic and psammitic lithologies come in, it may reach 2.5km
has upper boundary definition: Top of highest limestone bed in Loch Tay Limestone Formation where present; in Glen Clova and Glen Esk below unit with beds of strongly magnetic semipelite, Banffshire Coast - incoming of dominantly turbiditic psammite and semipelite.

Upper Erins Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DBUE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DBUE MLMST
has lithology component: DBUE PEL
has lithology component: DBUE QZITE
has obsolete equivalent: DBUE mn 4375
broader: Crinan Subgroup

Altmore Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCAF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Loch Avich Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCAG PEL
has lithology component: DCAG PSAMG
has lithology component: DCAG PSAMM
has lithology component: DCAG SEMPEL
has obsolete equivalent: DCAG mn 2446
broader: SOHI

Loch Avich Lavas Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCAL MLAVA
has obsolete equivalent: DCAL mn 2447
broader: SOHI

Aberfoyle Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ABSF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41506
has lithology component: DCAS MSDST
has lithology component: DCAS PEL
has lithology component: DCAS PSAMM
has lithology component: DCAS SEMPEL
has obsolete equivalent: DCAS mn 37
broader: SOHI
has lower boundary definition: Undefined; base not observed.
has geographical distribution: Southwest of Loch Tay Fault from Loch Venachar to Loch Lomond (= to Luss Slates) and farther southwest, where known as 'Dunoon Phyllites'.
has lithology description: Pelite and semipelite, grey to black in general, but purple or green locally, with thin units of coarse gritty sandstone developed locally.
has thickness description: c.500m (estimated)
has upper boundary definition: Outgoing of grey and black to purple slates and incoming coarse gritty and microconglomeratic arenites of the Creag Innich Sandstone Formation.

Beinn Bheula Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCBB MCONG
has lithology component: DCBB PEL
has lithology component: DCBB PSAMM
has lithology component: DCBB SCH
has lithology component: DCBB SCHM
has lithology component: DCBB SEMPEL
has lithology component: DCBB SLST
has lithology component: DCBB WACKE
has obsolete equivalent: DCBB mn 373
broader: SOHI

Ballykelly Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCBF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCBF PEL
has lithology component: DCBF PSAMM
has lithology component: DCBF SEMPEL
broader: NE

Bullrock Greywacke Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCBG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/E
has lithology component: DCBG MLMST
has lithology component: DCBG PEL
has lithology component: DCBG PELGP
has lithology component: DCBG PSAMM
has lithology component: DCBG SEMPEL
has lithology component: DCBG SLTE
has obsolete equivalent: DCBG mn 681
has obsolete equivalent: DCBG mn 680
broader: STNI

Baranailt Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCBL MLMST
broader: NE

Down Cliff Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41508
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41509
has lithology component: DCC CALSST
has lithology component: DCC SALMST
has lithology component: DCC SAMDST
has lithology component: DCC SIMST
has source info: DCC_48917
has source info: DCC_49332
has source info: DCC_49471
has source info: DCC_50046
has source info: DCC_50754
has source info: DCC_51796
has source info: DCC_52546
has source info: DCC_52641
has obsolete equivalent: DCC mn 1301
has obsolete equivalent: DCC mn 1299
broader: Bridport Sand Formation
has lower boundary definition: Base probably a non-sequence: sandy mudstone resting sharply on fossiliferous fine limestones of the Beacon Limestone Formation.
has geographical distribution: Dorset from Bridport to Shaftsbury; Shepton Mallet area of east Somerset.
has lithology description: Grey, calcareous, bioturbated silicate mudstones, locally very finely sandy and micaceous, which generally increases upwards. In upper part, beds up to 0.5m thick of pale grey calcareous very fine-grained silicate-sandstone or finely sandy limestone occur. Fauna includes ammonites.
has thickness description: Dorset coast: 10 to 21m. Inland Dorset: 0 to 121m (Bristow et al., 1995). East Somerset up to 12m.
has upper boundary definition: Top is marked by the change up from sandy mudstone to sands or sandstones of the undivided Bridport Sand Formation.

Carnaneigh Green Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DCCA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Double Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: DCCC
has current status: CURRENT
has theme: BEDRCK
notation: D
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DCCC COAL
broader: PMCM

Claudy Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCCF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE
narrower: Alla Glen Limestone Member
narrower: Bonds Glen Limestone Member

Doddiscombe Formation And Codden Hill Chert Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DCCH
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
broader: TEVY
narrower: Hearson Hill Mudstone

Cloghan Green Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DCCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Croaghgarrow Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCCR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dart Formation [Obsolete Code: Use Dart]
type: Concept
in scheme: NamedRockUnit
alternative label: DCDF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dunkeld Grit
type: Concept
in scheme: NamedRockUnit
alternative label: DCDG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCDG SDST
has lithology component: DCDG SLST
broader: NE

Dunoon Phyllite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCDP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCDP MLMST
has lithology component: DCDP PEL
has lithology component: DCDP PSAMM
has lithology component: DCDP SEMPEL
has obsolete equivalent: DCDP mn 1361
broader: SOHI

Dart Formation [Redundant Entry: Use Dart]
type: Concept
in scheme: NamedRockUnit
alternative label: DCDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DCDS mn 1220
broader: NE

Clift Hills 'Division'
type: Concept
in scheme: NamedRockUnit
alternative label: DCF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCF MLAVA
has lithology component: DCF MTUF
has lithology component: DCF QZITE
has lateral equivalent: DCF SOHI
broader: Dalradian Supergroup
narrower: Dunrossness Phyllitic Formation
narrower: Dunrossness Spilitic Formation
narrower: Asta Spilitic Formation
narrower: Clift Hills Phyllitic Formation
narrower: Asta Spilitic Formation [Obsolete Code: Use Assp]

Fahan Grits
type: Concept
in scheme: NamedRockUnit
alternative label: DCFG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Fahan Slates
type: Concept
in scheme: NamedRockUnit
alternative label: DCFS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Green Beds Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCGB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCGB MLAVA
has lithology component: DCGB MTUF
has lithology component: DCGB MVCSR
has lithology component: DCGB TUF
has obsolete equivalent: DCGB mn 1833
broader: SOHI

Greencastle Green Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DCGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Glengawna Formation [Obsolete Code: Use Gaa]
type: Concept
in scheme: NamedRockUnit
alternative label: DCGF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Glenelly Formation (A) [Obsolete Code: Use Glly]
type: Concept
in scheme: NamedRockUnit
alternative label: DCGG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DCGG mn 1772
broader: NE
has supplementary information: The bracketed letter (A) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Glendun Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCGN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: SOHI

Glenelly Formation (B) [Obsolete Code: Use Glly]
type: Concept
in scheme: NamedRockUnit
alternative label: DCGO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE
has supplementary information: The bracketed letter (B) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Glen Sluan Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCGS PEL
has lithology component: DCGS PSAMM
has lithology component: DCGS SEMPEL
has obsolete equivalent: DCGS mn 1760
broader: SOHI

Black Schist + Chert
type: Concept
in scheme: NamedRockUnit
alternative label: DCHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Chert And Black Shale With Sandstone Bands [Within Hbs]
type: Concept
in scheme: NamedRockUnit
alternative label: DCHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Pelite Of Glenesk
type: Concept
in scheme: NamedRockUnit
alternative label: DCHP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dunaskin Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DCI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DCI FESTC
broader: LCMS
has geographical distribution: Parts of Ayrshire.

Innellan Group
type: Concept
in scheme: NamedRockUnit
alternative label: DCIG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41510
has lithology component: DCIG CONG
has lithology component: DCIG CSSST
has lithology component: DCIG SLTE
has lithology component: DCIG WACKE
has source info: DCIG_49918
has source info: DCIG_50405
has source info: DCIG_51355
has source info: DCIG_52945
broader: NE
has lower boundary definition: Drawn at base of semi-pelitic wacke of the Innellan Group where it rests conformably on psammitic wacke of the Bullrock Greywacke.
has geographical distribution: Strathclyde, Scotland.
has lithology description: Pebbly schistose grits, schistose grits, greywackes, black and green slates. Black slates occur with sporadic seams of dark lime and grit. Conglomerate also occurs. (Innellan Group = stratigraphic equivalent of the Dunoon Phyllites).
has thickness description: 1000m approx.
has upper boundary definition: Drawn at unconformable upward change from conglomerate and semi-pelitic wacke of the Innellan Group to probable Upper Old Red Sandstone.

Innellan Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: SOHI

Inishowen Head Grits
type: Concept
in scheme: NamedRockUnit
alternative label: DCIS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Kells Grit
type: Concept
in scheme: NamedRockUnit
alternative label: DCKG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: SOHI

Denbury Crinoidal Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has obsolete equivalent: DCL mn 1241
broader: NA

Leny Grits
type: Concept
in scheme: NamedRockUnit
alternative label: DCLE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCLE CSSST
has lithology component: DCLE MCONG
has lithology component: DCLE PEL
has lithology component: DCLE PSAMG
has lithology component: DCLE SLTE
has lithology component: DCLE WACKE
has obsolete equivalent: DCLE mn 38
broader: SOHI
has lower boundary definition: Lower boundary with Aberfoyle Slates.
has geographical distribution: Not defined.
has lithology description: Cleaved greywackes commonly with grit and pebbly greywacke bands. Slate interbeds. NOTE: Leny Grits replaces Upper and Lower Leny Grits where the two units cannot be adequately defined.
has thickness description: Not defined.
has upper boundary definition: Faulted.

Leckpatrick Green Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DCLP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Loch Ranza Slate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCLS PEL
has lithology component: DCLS PSAMM
has lithology component: DCLS SEMPEL
has obsolete equivalent: DCLS mn 2462
broader: SOHI

Londonderry Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCLY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dolyfan Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DCM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: YA

Mullaghcarn Formation (A) [Obsolete Code: Use Mca]
type: Concept
in scheme: NamedRockUnit
alternative label: DCMF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE
has supplementary information: The bracketed letter (A) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Mullaghcarn Formation (B) [Obsolete Code: Use Mca]
type: Concept
in scheme: NamedRockUnit
alternative label: DCMG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DCMG mn 2969
broader: NE
has supplementary information: The bracketed letter (B) after the name is a late-stage expedient, added to avoid potential problems related to holding identical entries in the database system.

Margie Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCML
has current status: CURRENT
has theme: BEDRCK
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41511
has lithology component: DCML CONG
has lithology component: DCML MLMST
has source info: DCML_49598
has source info: DCML_49843
has source info: DCML_50184
has source info: DCML_52021
has obsolete equivalent: DCML mn 2753
broader: MARG
has lower boundary definition: A conformable contact with psammite and/or pelite of the Margie formation.
has geographical distribution: The river Esk and adjacent area within the Highland Boundary Fault system north-west from Edzell, Angus, Scotland.
has lithology description: A coarse-grained, calcitic meta-limestone, generally sandy and locally containing slate pebbles to which the limestone forms a carbonate matrix, which varies in colour from blue-grey to dark grey.
has thickness description: 2 m thick.
has upper boundary definition: A conformable contact with psammite and/or pelite of the Margie formation.

Mullyfa Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCMY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

North Sannox Grits Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DCNS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCNS LMST
has lithology component: DCNS MLMST
has lithology component: DCNS PEL
has lithology component: DCNS PSAMM
has lithology component: DCNS SEMPEL
has lithology component: DCNS SLTE
has obsolete equivalent: DCNS mn 3075
broader: SOHI
has geographical distribution: Isle of Arran

Deep Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DCO COAL
broader: PLCM

Pitlochry Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: PitS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41512
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41513
has lithology component: DCPS PEL
has lithology component: DCPS PSAMI
has lithology component: DCPS PSAMM
has lithology component: DCPS SEMPEL
has source info: DCPS_49952
has source info: DCPS_50001
has source info: DCPS_50024
has source info: DCPS_51142
has obsolete equivalent: DCPS mn 3324
broader: SOHI
has lower boundary definition: Change from silty limestone at top of Loch Tay Limestone to dominantly semipelitic and pelitic rocks.
has geographical distribution: From Glen Brerachan [NO 01 63], 9km north-east of Pitlochry, south-westwards through Pitlochry [NN 94 58] to Kenmore [NN 77 45] and at least as far as Loch Tay Fault in Sheets 46 and 47. Also small outlier west of Glen Doll Fault [NO 23 78].
has lithology description: Semipelite dominant with interbedded pelite, micaceous psammite and volcaniclastic rocks (Green Beds), and containing minor pebbly psammite. Metamorphosed to garnet-mica schist in type area.
has thickness description: 300 - 500m (estimated 300+m in Sheet 55W); not mapped separately in Sheet 55E, but transition to Ben Ledi Grit or equivalent probably occurs 300 - 500m above base of Southern Highland Group, close to main 'Green Beds' unit.
has upper boundary definition: Change from dominantly semipelitic rocks to dominantly psammitic rocks (not seen in Sheet 55W). In parts of the outcrop outwith Sheet 55W, the change coincides with the main volcaniclastic unit.

Rosehearty Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCRG
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41514
has lithology component: DCRG CSSST
has lithology component: DCRG SCH
has lithology component: DCRG WACKE
has source info: DCRG_51355
has source info: DCRG_52204
has obsolete equivalent: DCRG mn 3640
broader: SOHI
has lower boundary definition: Drawn at base of semi-pelitic wacke of the Rosehearty Formation where it rests conformably on limestone and semi-pelitic wacke of the Kinnairds Head Formation.
has geographical distribution: Grampian, Scotland.
has lithology description: Pebbly grits, greywacke and andalusite schists.
has thickness description: Not known.
has upper boundary definition: Drawn at conformable upward passage from semi-pelitic wacke of the Rosehearty Formation to semi-pelitic wacke of the Macduff Slates.

Runabay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCRH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has obsolete equivalent: DCRH mn 3683
broader: NE

Downton Castle Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DCS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: SO
has youngest age: SO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41517
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41519
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41515
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41516
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41518
has lithology component: DCS MCASST
has lithology component: DCS MDST
has lithology component: DCS SDST
has lithology component: DCS SLST
has source info: DCS_48655
has source info: DCS_50827
has source info: DCS_51549
has source info: DCS_51757
has source info: DCS_52005
has obsolete equivalent: DCS mn 1307
broader: Downton Group
narrower: LBB
narrower: PTY
has lower boundary definition: Base of Ludlow Bone Bed Member (if present); sharp junction with underlying Upper Ludlow Shale (Upper Whitcliffe Formation).
has geographical distribution: Welsh Borderland.
has lithology description: Ludlow Bone Bed Member locally at base; Platyschisma Shale Member (to 2m) above; mainly yellow, fine-grained, micaceous, well-sorted cross-bedded sandstone (Sandstone Member), with siltstone and olive green mudstone.
has thickness description: About 15m in type area; 17m at Ludlow, 15-20m in South Staffordshire
has upper boundary definition: Top of highest sandstone below red mudstones of the Ledbury (Raglan Mudstone) Formation or below the conformable base of the olive green mudstones and siltstones of the Temeside Shales Formation.

Down Cliff Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DCS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41520
has lithology component: DCSA LMST
has lithology component: DCSA SAMDST
has lithology component: DCSA SANDU
has lithology component: DCSA SDST
has source info: DCSA_49903
has source info: DCSA_50995
has source info: DCSA_51418
has source info: DCSA_52641
has obsolete equivalent: DCSA mn 2315
has obsolete equivalent: DCSA mn 1300
broader: Dyrham Formation
has lower boundary definition: Base of Starfish Bed.
has geographical distribution: Southwest Dorset. Mapped on Sheet 327 (Bridport). Northern limit not yet proved.
has lithology description: Grey-brown, muddy, very fine-grained sands and sandy mudstones, closely interbedded.
has thickness description: To 27m
has upper boundary definition: Top of Margaritatus Stone.

Shanaghy Green Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DCSG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Dun Caan Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DCnS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41521
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41522
has lithology component: DCSH LMST
has lithology component: DCSH MDST
has lithology component: DCSH SDST
has lithology component: DCSH SLST
has source info: DCSH_49569
has source info: DCSH_50053
has obsolete equivalent: DCSH mn 3104
broader: Bearreraig Sandstone Formation
has lower boundary definition: Unseen?
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Dark grey sandy, fissile mudstones with concretions of sandy limestone.
has thickness description: 12m
has upper boundary definition: Overlain by thinly bedded calcareous sandstones of the Beinn na Leac Sandstone Member.

Sheskin Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Saxa Vord Group
type: Concept
in scheme: NamedRockUnit
alternative label: DCSV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCSV PEL
has lateral equivalent: DCSV DCF
broader: Dalradian Supergroup
narrower: SVP
narrower: QUHF
narrower: Hevda Phyllite Formation

Dog Crag Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DCT
has current status: CURRENT
has theme: BEDRCK
notation: DCT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41525
has lithology component: DCT LPTUF
has source info: DCT_49785
has source info: DCT_51599
has source info: DCT_51750
has source info: DCT_51902
has source info: DCT_51973
has obsolete equivalent: DCT mn 3352
broader: PHT
has lower boundary definition: Base of lapilli-tuff rests on a non-sequence that occurs at the top of the Whinny Bank Formation - an interbedded succession of siltstone and andesitic lapilli-tuff.
has geographical distribution: Wicham Valley:- between Bankside (SD 158 831) and Lacra Bank (SD 145 815)
has lithology description: Eutaxitic lapilli-tuff, composition probably dacitic (or andesitic), interpreted as pyroclastic flow deposit.
has thickness description: To 30m
has upper boundary definition: Parallel bedded tuff and lapilli-tuff of the Po House Tuff Formation.

Downton Castle Sandstone Formation And Temeside Mudstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DCTE
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: SO
has youngest age: SO
has lithology component: DCTE AROC
has lithology component: DCTE MCASST
has lithology component: DCTE MDST
has lithology component: DCTE SDST
has lithology component: DCTE SLST
broader: NA

Down Cliff Sand Member And Thorncombe Sand Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DCTS
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has lithology component: DCTS LMST
has lithology component: DCTS MDST
has lithology component: DCTS SAMDST
has lithology component: DCTS SANDU
has lithology component: DCTS SDST
has lithology component: DCTS SILT
broader: Dyrham Formation

Tayvallich Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DCTV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DCTV BALVPW
has lithology component: DCTV MBA
has lithology component: DCTV MBAR
has lithology component: DCTV MLAVA
has lithology component: DCTV MLMST
has lithology component: DCTV MTUF
has lithology component: DCTV MVCIR
has lithology component: DCTV PELGP
has obsolete equivalent: DCTV mn 4123
broader: SOHI

Upper Whitehills Group
type: Concept
in scheme: NamedRockUnit
alternative label: DCUW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41526
broader: NE
has lower boundary definition: Drawn at base of phyllites of Whitehills Group where it rests conformably on the Boyne Limestone.
has geographical distribution: Grampian,Scotland.
has lithology description: Dark,flaggy quartzites,purple,quartzose phyllites,white limestones,calcareous flags and pebbly grits.(correlative of Whitehills Group-pelitic group and upper psammitic group).
has thickness description: not defined.
has upper boundary definition: Drawn at conformable upward passage from pebbly grit of the Whitehills Group to andalusite schists of the Boyndie Bay Group.

Doldowlod Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dd
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41527
has lithology component: DD CONG
has lithology component: DD MDST
has lithology component: DD SDST
broader: NTM
has lower boundary definition: Taken at base of first thick bed of conglomerate, sandstone or pebbly mudstone. Sharp.
has geographical distribution: Central Wales.
has lithology description: Interbedded conglomerates, sandstones, pebbly mudstones and mudstones.
has thickness description: Up to 450m.
has upper boundary definition: Taken at top of last thick bed of conglomerate, sandstone or pebbly mudstone. Upper boundary gradational where overlain by further Nantmel Formation strata or sharp where overlain by Yr Allt Formation.

Ddolhir Beds [Originally Dolhir]
type: Concept
in scheme: NamedRockUnit
alternative label: DDB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Doddiscombe Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DDC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41528
has lithology component: DDC CHRT
has lithology component: DDC LMST
has lithology component: DDC SMDST
has source info: DDC_49094
has source info: DDC_49643
has source info: DDC_50469
has source info: DDC_50519
has source info: DDC_52084
has source info: DDC_52501
has obsolete equivalent: DDC mn 304
has obsolete equivalent: DDC mn 1267
has obsolete equivalent: DDC mn 2318
has obsolete equivalent: DDC mn 3313
has obsolete equivalent: DDC mn 308
has obsolete equivalent: DDC mn 2559
has obsolete equivalent: DDC mn 3311
broader: TEVY
has additional age information: The original Lexicon entry for Doddiscombe Formation carried an "age" of Courceyan. This precision was not repeated by the author of the current entry, who suggests "Dinantian".
has lower boundary definition: Between Brushford and Wellington the lower boundary is taken at the incoming of hard black finely laminated unfossiliferous, slightly siliceous mudstones of the Doddiscombe Formation above the soft medium to dark grey mudstones with scattered very thin limestones, siltstones and sandstones of the underlying Pilton Mudstone Formation. West of South Molton, the lower boundary is taken at the incoming of dark grey to black, rarely fossiliferous slightly siliceous, finely laminated mudstones (Unit D of the Pilton Beds of Prentice 1960), known to equate with the Doddiscombe Formation, above the fossiliferous mudstones with thin sandstones and siltstones of the underlying Pilton Mudstone Formation. The Doddiscombe Formation has not been mapped by BGS west of South Molton; instead it has been included in the Pilton Mudstone Formation and/or the Codden Hill Chert Formation. Further work is therefore needed.
has geographical distribution: Between Brushford (SS 92 26) and Wellington (ST 13 20), Somerset. Known to extend west of South Molton to the Barnstaple area (SS 50 33) as the dark unfossilferous silty mudstones, Unit D of the Pilton Beds of Prentice (1960). This unit has not been mapped by BGS west of South Molton and further work is needed.
has lithology description: Hard, black, slightly siliceous, finely laminated mudstones with sparse very thin siltstone beds. There are scattered thin lenticular ?chert and phosphate nodules and sparse impure limestones and local pale calcareous mudstones. The formation is rarely fossiliferous.
has thickness description: 8 to 80m; lower thickness likely to be tectonic.
has upper boundary definition: Between Brushford and Wellington the upper boundary is taken at the incoming of thin to medium bedded soft siliceous mudstones with impure limestones and cherts of the Bampton Limestone Formation above the hard black, finely laminated unfossiliferous cherty mudstones of the underlying Doddiscombe Formation. West of South Molton, the upper boundary is taken at the incoming of dark grey interbedded siliceous mudstones and shaly mudstones of the overlying Coddon Hill Chert Formation above the dark unfossiliferous slightly siliceous mudstones (Unit D of the Pilton Beds of Prentice 1960), known to equate with the Doddiscombe Formation. Neither this boundary nor the Doddiscombe Formation has been mapped by BGS west of South Molton and further work is needed.

Daren-Ddu Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DDCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: DDCO COAL
broader: Hughes Member

Dalmellington Diamond Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DDDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DDDC COAL
broader: MCMS

Dry Doddington Nodule Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DDDN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DDN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41529
has lithology component: DDDN CAMDST
has lithology component: DDDN LMST
has lithology component: DDDN MDST
has source info: DDDN_49022
has source info: DDDN_49323
has source info: DDDN_50409
has source info: DDDN_50484
broader: Beckingham Member
has lower boundary definition: Change up from bluish grey, shaly mudstone of undifferentiated Beckingham Member; at 40.56m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it passes south into either part of the more argillaceous Rugby Limestone Member of the Blue Lias Formation or part of the mudstone dominated Charmouth Mudstone Formation.
has lithology description: Sequence of grey mudstone beds with numerous ovoid, grey, ochreous-weathering, argillaceous limestone nodules 0.05 to 0.2m in diameter, which are conspicuous in the soil. Some nodules are rich in small bivalves (Modiolus), and with gastropods. May include thin, silty, shelly, ferruginous limestone beds at base. Forms a strong feature with a dip slope in places.
has thickness description: About 2m; 1.94m in type section
has upper boundary definition: Change up into grey, shelly, bioclastic limestone of the undifferentiated Beckingham Member; at 38.62 in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).

Dura Den Member
type: Concept
in scheme: NamedRockUnit
alternative label: DDF
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41530
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41531
has lithology component: DDF MDST
has lithology component: DDF PESST
has lithology component: DDF SDST
has lithology component: DDF SLST
has source info: DDF_48718
has source info: DDF_49845
has source info: DDF_51146
has source info: DDF_51673
has source info: DDF_51824
has obsolete equivalent: DDF mn 1366
broader: Glenvale Sandstone Formation
has lower boundary definition: The top of the coarser-grained sandstone within the Glenvale Sandstone Formation.
has geographical distribution: The Stratheden area of the Midland Valley of Scotland, on sheets 40E (uncertain), 48E and 49. Additionally a thin lens-shaped unit is restricted to the Cupar area.
has lithology description: Red, cream and green siltstones, alternating with fine-grained cream sandstones, coarser pebbly sandstones and thin partings of red or green mudstone.
has thickness description: Approximately 40 m thick.
has upper boundary definition: Drawn at the conformable upward passage from siltstone and sandstones of the Dura Den Member to the white or cream sandstones of the Knox Pulpit Sandstone Formation.

Dundarg Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DDG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: DDG BREC
has lithology component: DDG CONG
has lithology component: DDG SDST
broader: Crovie Sandstone Group

Disturbed Ground (Undivided)
type: Concept
in scheme: NamedRockUnit
alternative label: DDGR
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 1
has rock unit rank: CL
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
has lithology component: DDGR ROCK
broader: NE
narrower: Mineral Extraction (Undivided)
narrower: Subsurface Structure (Undivided, Unrelated To Mining)
narrower: War Damage (Undivided)
has lithology description: Variable composition; Man-made superficial deposit. Areas of ill-defined surface workings and excavations; complex association between areas of subsidence and Made Ground. [Generic description].

Duddo Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DDL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DDL LMST
broader: TYLS

Darren Ddu Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DDLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41532
has lithology component: DDLM DLMDST
has lithology component: DDLM LMMST
has lithology component: DDLM MDST
has source info: DDLM_48805
has source info: DDLM_51233
has obsolete equivalent: DDLM mn 340
has obsolete equivalent: DDLM mn 971
broader: Coed Ffyddlwn Formation
has lower boundary definition: The base is placed at the sharp, planar junction between pale grey lime mudstone at the base of the Member and the underlying fine-grained dolostone of the lower part of the Coed Ffyddlwn Formation.
has geographical distribution: Clydach valley, on the northeast crop of the South Wales Coalfield [SO 215 125].
has lithology description: Thinly bedded, pale grey micritic limestones (lime mudstones), locally peloidal, with grey-green mudstones and cream laminated dolomitic mudstones; algal laminite locally at the top.
has thickness description: 2 to 3m
has upper boundary definition: The upper boundary is placed at an irregular, stylolitized surface cut in the topmost pale grey lime mudstones of the Member, which is overlain by a coarse bioclastic grainstone (the Craig-y-Gaer Coral Bed) at the base of the Gilwern Oolite Formation.

Diddup Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DDLS
has current status: CURRENT
has theme: BEDRCK
notation: DdLs
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: DDLS LMST
broader: Caaf Water Limestone Formation

Drumderfit Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DDM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41533
has lithology component: DDM CONG
has source info: DDM_48667
broader: RDF
has lower boundary definition: Conformable lower contact on Avoch Sandstone Member.
has geographical distribution: Not defined.
has lithology description: Red cobble-boulder conglomerate.
has thickness description: + 100 metres lensing.
has upper boundary definition: Conformable upper contact with Goose Sandstone Member.

Daren-Ddu Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DDRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: DDRC COAL
broader: Hughes Member

Ddugaled Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DDUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DDUC COAL
has lateral equivalent: DDUC st 927
broader: SWMCM

Dalmellington Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DE COAL
broader: MCMS

Dean Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: DEAN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DEAN COAL
has lithology component: DEAN MDST
broader: PMCM

Dersingham Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DEB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DeB
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41534
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41535
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41536
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41537
has lithology component: DEB MDST
has lithology component: DEB SANDU
has lithology component: DEB SDST
has source info: DEB_49003
has source info: DEB_49556
has source info: DEB_50838
has source info: DEB_51284
has obsolete equivalent: DEB mn 1249
has obsolete equivalent: DEB mn 3712
broader: NP
narrower: SNC
has lower boundary definition: A downward change from ferruginous, fine-grained sandstone to unconsolidated, fine- to medium-grained, cross-bedded, generally clean, pale quartz sands [Leziate Member of the Sandringham Sands Formation].
has geographical distribution: Crops out at Heacham to Babingley River and Roydon to Ashwicken, and outliers occur at Rising Lodge and East Winch. It is cut out by the overstepping Carstone in the vicinity of East Winch. Boreholes at Gayton and Hunstanton penetrated the Formation.
has lithology description: The Formation comprises a rythmic succession of thinly interbedded, fine-grained sands, ferruginous sandstones, silts and clays. The Formation varies laterally from ferruginous fine-grained sands and sandstones around Dersingham and Roydon Common, to silts in the Hunstanton Borehole. Clay [Snettisham Clay Member] is present at the top of the Formation, such as in the Hunstanton Borehole, at Dersingham and at Snettisham. It passes laterally into the Tealby Formation under The Wash.
has thickness description: To c.16m
has upper boundary definition: Ferruginous, medium-grained, generally oolitic and pebbly sand, locally clayed at the base [Carstone Formation], overlies mudstone [Snettisham Clay Member] around Dersingham and Snettisham. At Hunstanton, silty, oolitic, pebbly clays at the base of the Roach Formation overlie a rhythmic succession of brown and red clay and clayey silt, oolitic in part; and separated by an interburrowed erosion surface.

Delta Bench Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DEBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DEBC COAL
broader: PMCM

Deception Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: DEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DEC COAL
broader: LSC

Desertcreat Group
type: Concept
in scheme: NamedRockUnit
alternative label: DECG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
broader: NE

Deep Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DECO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DECO
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41538
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41539
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41540
has lithology component: DECO AND
has lithology component: DECO CONG
has lithology component: DECO SDST
has source info: DECO_51629
has source info: DECO_51673
has source info: DECO_51883
has source info: DECO_51981
broader: Arbuthnott-Garvock Group
has lower boundary definition: The base of the formation is placed at the top of a thick succession of andesitic lavas of the Montrose Volcanic Formation where this is conformably and somewhat diachronously overlain by a massive clast-supported conglomerate, above which it passes laterally into, and interfingers with, sandstone of the Tannadice Sandstone Member of the Scone Sandstone Formation.
has geographical distribution: North-eastern Midland Valley, between Drumlithie and the River South Esk.
has lithology description: A pebbly and cobbly, well-rounded, clast-supported conglomerate of lava, psammite, quartzite and feldspar-porphyry in a matrix of poorly-sorted, fine- to medium-grained lithic sandstone, commonly with lenses of trough cross-bedded pebbly sandstone.
has thickness description: Up to 880 m thick in the type area, passing laterally into sandstone of Tannadice Sandstone Member towards the south-west.
has upper boundary definition: A clast-supported conglomerate conformably, somewhat diachronously and locally interfingered with the base of a red, massive or laminated, poorly-sorted siltstone of the Cromlix Mudstone Formation.

Dee Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DEEVA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41541
has lithology component: DEEVA C
has lithology component: DEEVA P
has lithology component: DEEVA S
has lithology component: DEEVA SZ
has lithology component: DEEVA V
has lithology component: DEEVA VS
has lithology component: DEEVA Z
has source info: DEEVA_51617
has obsolete equivalent: DEEVA mn 4294
broader: Cheshire - North Wales Catchments Subgroup
has lower boundary definition: Probably unconformable, irregular and in places strongly incised into lithologically variable sediments of the Caledonia or Albion Glacigenic groups or into bedrock.
has geographical distribution: Cheshire, within the river valley and tributaries of the River Dee.
has lithology description: Alluvium of silt, sand and clay with some peat, grading to gravel towards the base. River Terraces are composed of silty sand or sandy gravel with rare clay.
has thickness description: To 10m
has upper boundary definition: Ground surface or unconformable below artificial deposits.

Dundee Flagstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DEF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DEF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41542
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41543
has lithology component: DEF MDST
has lithology component: DEF SDST
has lithology component: DEF SLST
has source info: DEF_51673
has source info: DEF_51981
has source info: DEF_52332
has obsolete equivalent: DEF mn 1347
broader: Arbuthnott-Garvock Group
has lower boundary definition: The top of the andesitic lava flows at Tealing House and Newton, near Dundee, the base of which is not generally exposed because it lies at the core of the Sidlaw Anticline.
has geographical distribution: Dundee-Inverkeilor area on Sheets 48E, 49, 57E (uncertain) and 57W.
has lithology description: Medium- to coarse-grained, cross-bedded sandstones and substantial, distinctive, flaggy sandstones interbedded with minor siltstones and mudstones, interdigitated with the Ochil Volcanic Formation.
has thickness description: Up to 1800 m thick.
has upper boundary definition: The top of the highest bed of flaggy sandstone and siltstone which is characteristic of the Dundee Flagstone Formation, and below the Scone Sandstone Formation.

Derfel Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DEL
has current status: CURRENT
has theme: BEDRCK
notation: DEL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41544
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41545
has lithology component: DEL CAMDST
has source info: DEL_49058
has source info: DEL_49215
has source info: DEL_50386
has source info: DEL_50530
has obsolete equivalent: DEL mn 3163
broader: Ceiswyn Formation
has additional age information: Caradoc (Costonian or Harnagian).
has lower boundary definition: Not seen, but interpreted as a fault against falsic ash flow tuffs of the Aran Fawddwy Formation (formerly the Llyn Conwy Formation) at its stratotype by BGS mapping in 1993. (Corwen provisional 1:50 000 Sheet 120). Elsewhere considered to be conformable on the Aran Fawddwy Formation.
has geographical distribution: Corwen and Bala areas.
has lithology description: Dark, blue-black pyritous, slightly calcareous, shelly mudstone, sporadically but richly fossiliferous.
has thickness description: 1m to 2m.
has upper boundary definition: Not seen, but appears to be conformable with the mudstones of the Ceiswyn Formation.

Delamere Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DELA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DmS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41546
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41547
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41549
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41548
has lithology component: DELA MDST
has lithology component: DELA PESST
has lithology component: DELA QZITE
has lithology component: DELA SDST
has source info: DELA_48928
has source info: DELA_50451
has source info: DELA_50673
has source info: DELA_52268
has source info: DELA_52496
has source info: DELA_52516
has source info: DELA_52706
has obsolete equivalent: DELA HEY
has obsolete equivalent: DELA mn 304
broader: Helsby Sandstone Formation
has lower boundary definition: Lowermost occurrence of dominantly pebbly sandstone overlying pebble-free weakly cemented sandstone of the Wilmslow Sandstone Formation.
has geographical distribution: Cheshire Basin; possibly southern part of the East Irish Sea Basin.
has lithology description: Sandstone and pebbly sandstone with subordinate mudstone beds. Reddish-orange and pale yellow. Planar and trough cross-bedded or massive. Common intraformational pebbles of sandstone and mudstone and extraformational quartz, up to 2.5cm. The Member is more strongly cemented than those immediately above and below, and is therefore commonly more resistant and consequentially commonly feature-forming.
has thickness description: 40m (Helsby area); c.90m (north Wirral).
has upper boundary definition: Uppermost occurrence of pebbly sandstone under weakly cemented pebble-free sandstone of the Frodsham Soft Sandstone Member (Helsby Sandstone Formation), or under interbedded siltstone and sandstone of the Tarporley Siltstone Formation (Mercia Mudstone Group).

Denny Lower Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DELB
has current status: CURRENT
has theme: BEDRCK
notation: DELB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41550
has lithology component: DELB CBFEST
has lithology component: DELB COAL
has lithology component: DELB FEST
has source info: DELB_51421
has source info: DELB_52647
broader: LSC
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Parrot coal : 6.5 cm - blackband ironstone : 17.5 cm - coal 5 cm.
has thickness description: 29 cm.
has upper boundary definition: Conformable.

Delta Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DELC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DELC COAL
broader: PMCM

Delnadamph Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: DELV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41551
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41552
has lithology component: DELV AMPHB
has lithology component: DELV PEL
has lithology component: DELV PSAMM
has lithology component: DELV QZITE
has lithology component: DELV SCH
has source info: DELV_49233
broader: Glenbuchat Graphitic Schist Formation
has lower boundary definition: Lower limit of metavolcanic units within graphitic pelites and semipelite sequence of the Glenbuchat Graphitic Schist Formation.
has geographical distribution: Stretches from the Tomintoul Old Red Sandstone outlier via Muckle Fergie Burn and Inchmore (Delnadamph) to Clach Choutsaich and Brown Cow Hill (Glen Gairn Granite).
has lithology description: Actinolite-rich finely to coarsely crystalline amphibolite, locally vesicular, pillowed in parts. Amphibolitic schists, hornblende-bearing psammite, quartzite and pelite interbeds.
has thickness description: 75 - 205m
has upper boundary definition: Upper boundary of amphibolitic material in partly graphitic semipelite and pelite sequence of the Glenbuchat Graphitic Schist Formation.

Den Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: DEN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DEN COAL
broader: MCMS

Dearcaige Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DEQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NA

Deri Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DER
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41553
has lithology component: DER COAL
has lithology component: DER CONG
has lithology component: DER MDST
has lithology component: DER QAREN
has lithology component: DER SLST
has source info: DER_49153
has source info: DER_49154
has source info: DER_49155
has source info: DER_49279
has source info: DER_51400
has obsolete equivalent: DER mn 1245
has obsolete equivalent: DER mn 2436
broader: WAWK
has lower boundary definition: The base of the Formation is diachronous and gradational, and placed at the base of the first development of red, green or purple mudstone, where it overlies grey mudstones of the South Wales Coal Measures Group.
has geographical distribution: The Formation is confined to the eastern part of South Wales Coalfield, extending from the Cynon Valley near Penrhiwceiber [ST 05 97] eastwards (see Downing and Squirrell, 1965, Figure 1).
has lithology description: The Formation comprises mottled red, purple, green and orange mudstones and mudstone palaeosols, pale green siltstones and pale grey quartz arenites and conglomerates. Thin coals fail progressively eastwards towards the Usk Anticline.
has thickness description: To 180m
has upper boundary definition: The top of the Formation is diachronous and gradational, and placed where the topmost development of red, green or purple mudstone, or white quartz arenite, is overlain by either grey mudstones of the South Wales Coal Measures Group or, on the east crop of the South Wales Coalfield, where it is overlain by the Brithdir Coal, marking the local base of the Pennant Sandstone Formation.

Derry Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: DERC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DERC COAL
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Deep Rider Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DERI
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: DERI COAL
broader: NE

Derlwyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DERL
has current status: CURRENT
has theme: BEDRCK
notation: DERL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Derrycreevy Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DERR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
broader: NE

Derwyddon Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DESA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NP

Dersingham Beds/Snettisham Clay [Obsolete Code: See Deb And Snc]
type: Concept
in scheme: NamedRockUnit
alternative label: DESC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KB
broader: NE

Dunfermline Splint Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: DESP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DESP COAL
broader: LSC

Dunfermline Under Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: DEU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DEU COAL
broader: LSC

Denny Upper Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DEUB
has current status: CURRENT
has theme: BEDRCK
notation: DEUB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41554
has lithology component: DEUB COAL
has lithology component: DEUB FEST
has source info: DEUB_49242
has source info: DEUB_51421
broader: LSC
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Ironstone rib - 4cm; Slaty blaes - 5 cm; Hard ironstone rib - 2.5 cm; Slaty blaes - 15 cm; Foul coal - 15cm.
has thickness description: 41.5 cm.
has upper boundary definition: Conformable.

Devonian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DEV
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: DEV CONG
has lithology component: DEV LMST
has lithology component: DEV MDST
broader: NA

Devonian And Carboniferous Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DEVC
has current status: CURRENT
has theme: BEDRCK
has unit class: AGE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: DEVC ROCK
broader: NP

Dalmellington Extra Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DEX COAL
broader: MCMS

Darwen Flags
type: Concept
in scheme: NamedRockUnit
alternative label: DF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DF SDST
broader: PLCM

Dipple Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DFB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: NE

Dunaskin Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: DFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DFC SEATM
broader: LCMS
has geographical distribution: Parts of Ayrshire.

Debris Flow Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: DFD
has current status: CURRENT
has theme: MASMVT
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: DFD B
has lithology component: DFD L
has lithology component: DFD MUD
has lithology component: DFD S
has lithology component: DFD V
broader: MASMD
has lithology description: Typically boulders, cobbles, gravel, sand and mud; deposited by mountainside debris flows with levees resulting from heavy rainfall and/or snow avalanches. [Generic description].

Douglas Four Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DFF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DFF COAL
broader: MCMS

Dyffryn Flags Facies (Caban Conglomerate Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: DFN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dfn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41556
has lithology component: DFN MDST
has lithology component: DFN SDST
has source info: DFN_51889
has obsolete equivalent: DFN mn 1378
has obsolete equivalent: DFN mn 1379
has obsolete equivalent: DFN mn 1380
broader: Caban Conglomerate Formation
has lower boundary definition: Not defined
has geographical distribution: Central Wales.
has lithology description: Interbedded turbidite mudstones, laminated hemipelagites and abundant thin turbidite sandstones.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Dundry Freestone
type: Concept
in scheme: NamedRockUnit
alternative label: DFR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: NE

Dumfries Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DFS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
is obsolete equivalent of: DFS LCH
broader: NE

Dipton Foot Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DFSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lateral equivalent: DFSB WHLM
broader: SMGP

Dunsil And First Waterloo Coal (Vale Of Belvoir)
type: Concept
in scheme: NamedRockUnit
alternative label: DFWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DFWC COAL
broader: PMCM

Denbigh Grits Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has lithology component: DG MDST
has lithology component: DG SDST
has source info: DG_52509
has obsolete equivalent: DG mn 1238
broader: NA
narrower: Berllan Beds
narrower: LLD
has lower boundary definition: Not defined.
has geographical distribution: Not defined.
has lithology description: Not defined.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Dingle Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Dixon Ground Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGD
has current status: CURRENT
has theme: BEDRCK
notation: DGd
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41558
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41557
has lithology component: DGD MDHLM
has lithology component: DGD SLST
has source info: DGD_49249
has source info: DGD_50960
has source info: DGD_52353
has source info: DGD_52930
broader: Brathay Formation
has lower boundary definition: A transition over a few hundred millimetres from massive, hard, poorly fissile grey siltstone of the Browgill Formation, into pale blueish or greenish grey muddy siltstone with a slightly better cleavage.
has geographical distribution: A narrow unit, extending across the south eastern Lake District, mapped as a distinct unit to about 4km southwest of Coniston village. It is present farther to the southwest, but has not been mapped due to poor exposure. It is shown on the Coniston 25k map but not the 50k Ambleside or Kendal sheets. It is also recognised in the Howgill Fells, and crops out on Sheets E38 and E39, but is only shown on the former.
has lithology description: Alternating pale grey, bioturbated siltstone and laminated hemipelagite.
has thickness description: From 10m to 30m thick.
has upper boundary definition: Taken at the top of the highest, pale grey, massive or bioturbated mudstone bed that is succeeded by more than 200mm of laminated hemipelagite.

Douglas Ell Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DGE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DGE COAL
has lateral equivalent: DGE CBEC
broader: LSC

Dun Gallain Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DGGR PSAMM
has source info: DGGR_52313
broader: Colonsay Group

Dungavel Hill Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGHC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Auchtitench Sandstone Formation

Drigg Holm Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGHS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41559
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41560
has lithology component: DGHS S
has lithology component: DGHS V
has source info: DGHS_49633
has source info: DGHS_50151
has source info: DGHS_51754
has obsolete equivalent: DGHS mn 3838
broader: Gosforth Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: Generally undulating erosional contact on to Drigg Beach Till Member of the Gosforth Glacigenic Formation.
has geographical distribution: 1:50k Sheet 37 Gosforth. Seascale, Ravenglass and Lower Wasdale areas, Western Cumbria.
has lithology description: Fine-to medium-grained sand with stringers of granule gravel and channels containing clast-supported gravel. The gravel comprises subangular to subrounded clasts of Skiddaw Group sandstones and siltstones, red and yellow sandstone, Borrowdale Volcanic Group rocks, granite, granophyre, coal and ironstone.
has thickness description: c. 2.5m - 3.5m
has upper boundary definition: Sub horizontal planar unconformable (?locally glacitectonic) contact with the the base of the Fishgarth Wood Till Member of the Gosforth Glacigenic Formation.

Dunaghy Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGHY
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Dungavel Group
type: Concept
in scheme: NamedRockUnit
alternative label: DGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41561
has lithology component: DGL CONG
has lithology component: DGL SDST
has source info: DGL_50457
has source info: DGL_51688
has source info: DGL_52143
broader: NE
narrower: MFD
narrower: PLWS
has lower boundary definition: Drawn at base of conglomerate of the Middlefield Conglomerate where it rests conformably on sandstones of the Logan Formation of the Waterhead Group.
has geographical distribution: Strathclyde, Scotland.
has lithology description: Sandstone and conglomerate.
has thickness description: 775m approx.
has upper boundary definition: Drawn at conformable upward passage from sandstone of the Plewlands Formation to Greywacke Conglomerate of the Old Red Sandstone.

Drummangarvagh Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DGM LMST
has lithology component: DGM MDST
has lithology component: DGM SDST
broader: Bellavally Formation

Drigg Moorside Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGMS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41562
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41563
has lithology component: DGMS C
has lithology component: DGMS S
has lithology component: DGMS V
has lithology component: DGMS Z
has source info: DGMS_49633
has source info: DGMS_49654
has source info: DGMS_50151
has source info: DGMS_51754
broader: Gosforth Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: Generally conformable on the Fishgarth Wood Till Member of the Gosforth Glacigenic Formation.
has geographical distribution: 1:50k Sheet 47 Gosforth, Drigg area, western Cumbria.
has lithology description: Thinly interbedded sequence of brown silty clay, clayey silt, very fine-grained sand and yellow brown fine- to medium-grained sands. Some beds of clay contain granules and fine pebbles.
has thickness description: 8.6m thick at its type section.
has upper boundary definition: Unconformably overlain by Holocene deposits such as blown sand and peats.

Douglas Nine Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DGN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DGN COAL
broader: LCMS

Dungoil Linear Vent-System
type: Concept
in scheme: NamedRockUnit
alternative label: DGOIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: VS
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
broader: SSDPC

Drigg Point Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGPS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41564
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41565
has lithology component: DGPS S
has source info: DGPS_49633
has source info: DGPS_49657
has source info: DGPS_50151
has source info: DGPS_50591
has source info: DGPS_51057
has source info: DGPS_51754
has obsolete equivalent: DGPS BSA
broader: British Coastal Deposits Group
has lower boundary definition: Unconformable (blanket) on all older Quarternary deposits.
has geographical distribution: 1:50k Sheets 37 Gosforth and 38 Whitehaven, Western Cumbria, (and could be applied to coastal Blown Sand along the Cumbria-Lancashire coasts).
has lithology description: Fine- to medium-grained quartz sand forming coastal dunes, typically up to 15m high in the type area.
has thickness description: Typically 5-10m thick but up to 15m thick in type area.
has upper boundary definition: The ground surface.

Dogger Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dgr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JA
has predominant age: JA
has youngest age: JA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41566
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41568
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41567
has lithology component: DGR FEOOL
has lithology component: DGR FEST
has lithology component: DGR FGSST
has lithology component: DGR LMOOL
has lithology component: DGR SHFEST
has lithology component: DGR SHYLST
has lithology component: DGR SLMDST
has source info: DGR_48893
has source info: DGR_49203
has source info: DGR_49204
has source info: DGR_49205
has source info: DGR_49756
has source info: DGR_49757
has source info: DGR_50318
has source info: DGR_50319
has source info: DGR_50435
has source info: DGR_50791
has source info: DGR_50963
has source info: DGR_51175
has source info: DGR_51412
has source info: DGR_51539
has source info: DGR_51694
has source info: DGR_52500
has source info: DGR_52966
has obsolete equivalent: DGR mn 1272
has obsolete equivalent: DGR mn 1273
broader: NP
has lower boundary definition: The lower boundary is generally sharp, disconformable or unconformable on the gently folded Lower Jurassic Lias Group. Marked by an abrupt change where grey fissile mudstone of the Lower Jurassic Whitby Mudstone Formation is overlain by sandstone, ironstone or limestone of the Dogger Formation. The boundary is less distinctive in the Peak Trough (Knox, 1984) (e.g. exposed at Blea Wyke; Ravenscar) [NZ 991 015] where the bioturbated sandstone of the Blea Wyke Sandstone Formation (late Toarcian in age ) is overlain by the yellow brown sandstone of the Dogger Formation (Aalenian in age).
has geographical distribution: Cleveland Basin, North Yorkshire, including the North Yorks Moors, North Yorkshire coast (between Boulby and Gristhorpe Bay) and the Howardian Hills. Offshore, the Dogger Formation is equivalent, in part, to the Wroot Formation (Lott and Knox,1994) in the southern North Sea and in part to the Drake Formation in the Brent Province (Butler et al., 2005). The formation is locally absent in the Cleveland Basin, especially on parts of the Egton Sheet (Ingleby Greenhow) and Thirsk Sheet (Hambleton Hills), where the Dogger Formation has been removed by penecontemporaneous erosion prior to deposition of the overlying Saltwick Formation (Ravenscar Group).
has landform description: Forms a small bench or positive topographical feature above the Whitby Mudstone Formation; less distinctive where it overlies the Blea Wyke Sandstone Formation at Ravenscar.
has lithology description: Highly variable and heterolithic with substantial lateral interdigitation and lithofacies changes. In the Whitby area and coastal sections to the southeast, the formation consists mainly of grey, weathering yellow-brown, ferruginous sideritic sandstone, medium- to coarse-grained, with sporadic phosphatic pebbles; berthierine (chamosite) ooids may be present. In central, north and west Cleveland there is a complex interdigitation between grey, weathering yellow-brown, berthierine (chamosite) ooidal ironstone (with siderite mudstone matrix) and pale grey limestone, medium-grained, bioclastic wackestone and packstone with peloids and ooids, generally bioturbated and locally cross-bedded. In Rosedale [SE 729 946] the Dogger Formation consists of magnetite and/or ferric cronstedite spinel and berthierine oolitic ironstone (Hemingway, 1974). In addition, partings, lenses and beds of grey, fossiliferous fissile mudstone may occur. Sandstones and ironstones are characteristically highly bioturbated and yield marine fossils including bivalves and scattered ammonites; corals, bryozoans, crinoids and brachiopods are locally present in the limestones.
has thickness description: Variable, both locally and regionally; generally about 0.75 to 2m thick on the Yorkshire Coast and in ferruginous sandstone/ironstone lithofacies; limestone and mudstone lithofacies, up to 12.2m locally preserved. Maximum thickness of 29m in the Rosedale area [SE 729 946] (where present as the Rosedale Ironstone). May be absent, locally, due to erosion prior to deposition of the overlying Saltwick Formation (Ravenscar Group).
has upper boundary definition: The upper boundary is unconformable or disconformable, generally sharp. Marked by an abrupt upward transition from ferruginous sandstone, ironstone or limestone at the top of the Dogger Formation to cross-stratified, non-bioturbated sandstone, siltstone and mudstone (commonly with plant fragments) of the overlying Saltwick Formation (Ravenscar Group).

Douglas Stoney Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DGS COAL
broader: LSC

Douglas Seven Foot Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: DGSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DGSF COAL
broader: MCMS

Dudgeon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TD
has predominant age: TD
has youngest age: TD
has obsolete equivalent: DGSL mn 1338
broader: Haisborough Group
narrower: KPHA

Douglas Smithy Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DGSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DGSM COAL
has lateral equivalent: DGSM CBSY
broader: LSC

Drigg Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGTI
has current status: CURRENT
has theme: SPRFCL
notation: DG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41569
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41570
has lithology component: DGTI CLAY
has lithology component: DGTI DMTN
has lithology component: DGTI GRAV
has lithology component: DGTI SANDU
has source info: DGTI_49633
has source info: DGTI_50151
has source info: DGTI_50231
broader: ISCAG
has lower boundary definition: Sharp, irregular, uncomformable contact with bedrock (mostly sandstone of the Sherwood Sandstone Group).
has geographical distribution: Drigg area and Lower Wasdale, West Cumbria.
has lithology description: Stony, sandy silty clay diamicton, reddish brown, extremely compact, with clasts mainly of welded tuff, greywacke and slate and granite derived from the western Lake District, together with red (Permian) and yellow (Carboniferous) sandstone and coal from West Cumbria, and sparse granodiorite from Scotland.
has thickness description: 5m
has upper boundary definition: Sharp, gently undulating, unconformable contact with laminated silt and clay of the Stubble Green Silt Member of the Glannoventia Formation, or sharp, planar, unconformable contact with sandy clay diamicton of the Holmrook Till Member of the Blengdale Glacigenic Formation.

Dolgau Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dgu
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: DGU MDST
has source info: DGU_51836
has obsolete equivalent: DGU mn 1277
has obsolete equivalent: DGU mn 1276
broader: NA
narrower: Dolgau Mudstones Formation (Lower Tongue)
narrower: Dolgau Mudstones Formation (Upper Tongue)
has lower boundary definition: Not defined.
has geographical distribution: Not defined.
has lithology description: Grey, green and locally purple mudstones; local burrow mottling.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Dolgau Mudstones Formation (Lower Tongue)
type: Concept
in scheme: NamedRockUnit
alternative label: DGUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: DGUL MDST
broader: Dolgau Mudstones Formation

Dolgau Mudstones Formation (Upper Tongue)
type: Concept
in scheme: NamedRockUnit
alternative label: DGUU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: DGUU MDST
broader: Dolgau Mudstones Formation

Douglas Water Arenite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DGW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DGW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41571
has lithology component: DGW MDST
has lithology component: DGW SDST
has source info: DGW_49807
broader: Glenbuck Group
has lower boundary definition: Top of the underlying Parishholm Conglomerate. (Boundary not exposed).
has geographical distribution: Lower Palaeozoic inlier of the Hagshaw Hills, Scotland. (50k Sheets 23E, 23W and 15W).
has lithology description: Pale red and yellow or brownish sandstones with greenish-grey intraclasts of shale, variably cemented.
has thickness description: About 78m
has upper boundary definition: Transitional boundary taken where the proportion of mudstone similar to that of the overlying Dovestone Redbeds exceeds that of the sandstone.

Dungeon Ghyll Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DGY
has current status: CURRENT
has theme: BEDRCK
notation: Dgy
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41572
has lithology component: DGY VCBR
has lithology component: DGY VCSLST
has lithology component: DGY VCSST
has source info: DGY_50725
has source info: DGY_52187
has obsolete equivalent: DGY mn 1349
broader: SET
has lower boundary definition: Taken at the base of dominantly disrupted units overlying volcaniclastic rocks of the Three Tarns, Cam Crags and Harrison Stickle members
has geographical distribution: Scafell Pike to the Langdale Pikes, and from Seathwaite Fell (Borrowdale) to Thirlmere, Cumbria
has lithology description: Volcaniclastic siltstone, sandstone and breccia characterised by widespread syndepositional deformation and slumping such that bedding, particularly in the finer lithologies, is rarely preserved
has thickness description: Up to 60m
has upper boundary definition: Defined by the base of overlyig pyroclastic rocks of the Pavey Ark Breccia Member

Duddon Hall Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41573
has lithology component: DH AND
has lithology component: DH ANDTFF
has lithology component: DH ANLTUF
has lithology component: DH BA
has lithology component: DH PYRBRC
has source info: DH_50725
has source info: DH_51787
has source info: DH_52404
has source info: DH_52939
has obsolete equivalent: DH mn 1336
has obsolete equivalent: DH mn 1337
has obsolete equivalent: DH mn 2672
broader: Borrowdale Volcanic Group
has lower boundary definition: Base of bedded tuff and lapilli-tuff (air-fall), unconformably overlying Airys Bridge Tuff Formation, (rhyodacitic tuff) and Waberthwaite Tuff Formation (dacitic tuff).
has geographical distribution: Ulpha Basin and Coniston Fells from Duddon Bridge (SD 19 88) via Ulpha (SD 19 93) to Wallowbarrow Heald (SD 21 97), Buck Pike (SD 261 972) to east of Birk Fell (NY 295 015), Cumbria.
has lithology description: Bedded tuff and lapilli-tuff (air-fall) with some pyroclastic breccia, intercalated andesite and basaltic andesite lava.
has thickness description: 200 to 450m
has upper boundary definition: At base of overlying formations including Ulpha Formation (andesite), Holehouse Gill Formation (mudstone and sandstone) and Wallowbarrow Formation (andesitic lapilli-tuff).

Dam House Bridge Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHBT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DHBT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OW
has predominant age: OW
has youngest age: OW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41574
has lithology component: DHBT MDST
has lithology component: DHBT SLST
has lithology component: DHBT TUF
has source info: DHBT_50498
broader: SOW
has lower boundary definition: Taken at the base of the lowest bed of volcaniclastic rock overlying calcareous siltstone and argillaceous limestones of the Norber Formation
has geographical distribution: Restricted to the Austwick area of N Yorkshire
has lithology description: Siltstone and mudstone with interbedded units of lithic crystal tuff, probably of silicic composition
has thickness description: Up to 40m
has upper boundary definition: Taken at the top of the last bed of tuff where it is overlain by siltstone and mudstone within the main part of the Sowerthwaite Formation

Douglas Humph Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DHC COAL
broader: MCMS

Doghole Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: DHCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DHCO COAL
broader: PLCM

Dale Head Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DHd
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41575
has lithology component: DHD VCBR
has lithology component: DHD VCSST
has source info: DHD_50725
has obsolete equivalent: DHD mn 1210
broader: Birker Fell Andesite Formation
has lower boundary definition: Base of volcaniclastic breccia and sandstone. Overlies unnamed basaltic andesite lava and locally a thin (3m) tuff. Probably unconformable.
has geographical distribution: Dale Head - Cockley Beck area in the Duddon Valley, Cumbria.
has lithology description: Massive units of heterolithic volcaniclastic breccia and sandstone.
has thickness description: 0 - 220m
has upper boundary definition: Succeeded by overlying parts of the Birker Fell Andesite Formation, including the Cockley Beck Tuff (garnetiferous, dacitic lapilli tuff) and a variety of basaltic andesite and andesite lava.

Duchray Hill Gneiss Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHGN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41576
has lithology component: DHGN MIGM
has lithology component: DHGN SEMPEL
has lithology component: DHGN SPELGN
has source info: DHGN_48871
has source info: DHGN_51786
has obsolete equivalent: DHGN mn 1335
broader: Ben Lui Schist Formation
has lower boundary definition: Base of dominantly semipelitic succession overlying the dominantly psammitic and quartzitic Corrydon Psammite Member in the Glen Shee area and the volcanic Farragon Volcanic Formation farther west.
has geographical distribution: Glen Shee to upper Glen Isla.
has lithology description: Schistose to gneissose semipelite, generally garnetiferous. Stromatic to granoblastic migmatites in the east passing westwards into predominantly schistose rocks.
has thickness description: Not known
has upper boundary definition: Base of calcareous rocks of the overlying Loch Tay Limestone Formation.

Dollis Hill Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41577
has lithogenesis: FLUV
has lithology component: DHGR CLAY
has lithology component: DHGR GRAV
has lithology component: DHGR SANDU
has lithology component: DHGR SILT
has source info: DHGR_49383
has source info: DHGR_51453
has obsolete equivalent: DHGR mn 1280
has obsolete equivalent: DHGR GSG
broader: SBRY
has lower boundary definition: Rests unconformably on bedrock geology.
has geographical distribution: Tributary of ancestral River Thames in the Finchley - Hoddesdon area of North London.
has lithology description: Gravel, sandy and clayey in part, with some laminated silty beds.Sand and gravel, locally with lenses of silt, clay or peat and organic material - [Generic description].
has thickness description: 1-15m.
has upper boundary definition: Overlain by Anglian Till in many places; otherwise at surface.

Donald's Hill Ignimbrite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DHI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41578
has lithology component: DHI TFWE
has source info: DHI_50215
broader: Antrim Lava Group
has additional age information: Early Paleocene.
has lower boundary definition: Welded tuff (as described under Lithology) disconformably overlies the karstified chalk surface of the Late Cretaceous Ulster White Limestone Formation. The upper few centimetres of the chalk are faintly stained yellow in some areas. Locally the base of the tuff oversteps onto Triassic, Carboniferous and Dalradian "basement" rocks.
has geographical distribution: On the western margin of the Antrim Plateau (Northern Ireland) for a distance of about 30km from the west flank of Donald's Hill to Sounding Hill quarry, southsoutheast of Magherafelt, County Londonderry.
has lithology description: Tuff, creamy white, grey to pinkish grey, formerly ignimbritic, silicic welded ash-flow, with streaky poorly banded matrix, quartz phenocrysts and vlvanogenic lithic and crystal fragments now completely replaced by cryptocrystalline silica; clasts, exclusively of flint nodules reworked by erosion from Cretaceous chalk.
has thickness description: 0.6 to 1.1m
has upper boundary definition: The welded tuff of the Donald's Hill Ignimbrite Formation is overlain by basalt lave flows of the Antrim Lave Group.

Daddyhole Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has obsolete equivalent: DHL mn 1202
broader: TQL

Dumdruff Hill Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41579
has lithology component: DHLA TR
has lithology component: DHLA TRAND
has source info: DHLA_49087
has source info: DHLA_49575
has source info: DHLA_49708
has obsolete equivalent: DHLA mn 1340
broader: Clyde Plateau Volcanic Formation
has lower boundary definition: The base is unconformable on the Eaglesham Lava Member that consists of basaltic lavas.
has geographical distribution: Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton around Ballageich (NS 520 520) and Braidley Moss (NS 610 410) south of Dumdruff Hill.
has lithology description: The Dumdruff Hill Lava Member consists of trachyandesites and trachytic lavas.
has thickness description: 45 to 70m
has upper boundary definition: The Member is overlain in part by the Gowk Stane Pyroclastic Member and the Harelaw Lava Member, with which it is partly interbedded. The upper Flow Moss Lava Member also locally rests on this Member.

Doon Hill Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHLC
has current status: CURRENT
has theme: BEDRCK
notation: DHLC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41580
has lithology component: DHLC CONG
has lithology component: DHLC MDST
has source info: DHLC_48694
has source info: DHLC_50759
has obsolete equivalent: DHLC mn 1290
broader: Balclatchie Formation
has lower boundary definition: Succeeds the dark grey mudstones of the Laggan Member of the Balclatchie Formation.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Thickly bedded conglomerate with partings of blue-grey green-weathering mudstones passing upwards into poorly-bedded dark green conglomerate with pebbles of spilite, gabbro, red granite, vein quartz and chert.
has thickness description: c.240m
has upper boundary definition: Succeeded by the mudstones of the Pumphouse Member of the Balclatchie Formation.

Derryhill Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Craighall Conglomerate Formation

Dowhills Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DHLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41581
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41582
has lithology component: DHLS CHRT
has lithology component: DHLS MDST
has lithology component: DHLS SDST
has lithology component: DHLS SLST
has source info: DHLS_48786
has source info: DHLS_48818
has source info: DHLS_50519
has source info: DHLS_50847
has source info: DHLS_51484
has source info: DHLS_52918
has source info: DHLS_52971
has obsolete equivalent: DHLS mn 150
has obsolete equivalent: DHLS mn 1096
has obsolete equivalent: DHLS mn 2378
has lateral equivalent: DHLS st 56
has obsolete equivalent: DHLS st 56
has obsolete equivalent: DHLS mn 1297
broader: TEVY
narrower: Ashton Mudstone Member
has lower boundary definition: In the north crop of the Culm synclinorium, between Brushford and Ashbrittle, the lower boundary is taken at the incoming of dark grey predominantly unfossiliferous finely laminated silty mudstones with scattered siltstones of the Dowhills Mudstone Formation above the highest limestone bed of the underlying Bampton Limestone Formation. Between Ashbrittle and Wellington the lower boundary is taken above the highest limestone bed of the underlying Westleigh Limestone Formation. West of South Molton the lower boundary is taken at the incoming of dark grey to black pyritic mudstones above the streaky laminated cherts and mudstones of the underlying Coddon Hill Chert Formation. The boundary is taken at the top of the highest chert bed. These pyritic mudstones, the Limekiln Beds of Prentice (1960) were included by Edmonds et al. (1985) in the Crackington Formation. Further work is needed in this area. In the south crop of the Culm synclinorium between Exeter and the Teign valley, the lower boundary is taken at the incoming of bluish grey micaceous mudstones with scattered thin sandstones and siltstones of the Ashton Mudstone Member above the fossiliferous interbedded cherts, limestones and mudstones (Posidonia Beds) of the Teign Chert Formation.
has geographical distribution: On the north crop of the Teign Valley Group between Bideford (SS 45 27), north Devon and Wellington (ST 13 20), Somerset. Between the Bideford area (SS 45 27) and Brushford (SS 92 26) west Somerset, the formation has not been mapped by BGS. In this area it probably equates with the Limekiln Beds (Prentice 1960), included in the Crackington Formation by Edmonds et al. (1979). Further work is needed in this area to resolve this. Due to thrusting along the south crop of the Teign Valley Group, the formation is seen only between the Teign valley (SX 84 84) and Exeter (SX 90 92), Devon. It may be present in the Okehampton area (SX 59 94) but has not been mapped, probably being included in the Crackington Formation. Further work is needed.
has lithology description: Dark grey to black, rather soft, pyritous mudstones with scattered thin siltstone and sandstone beds (less than 10%). There are some thin chert beds on the north crop of the Culm synclinorium. The Ashton Mudstone Member is the lateral equivalent of the Formation on the south crop; it is thought to be characterised by more abundant and thicker sandstones. Further work is needed to confirm this.
has thickness description: 210 to 430m on south crop, 30m on north crop.
has upper boundary definition: The upper boundary is gradational and taken at the incoming of more abundant and relatively thicker sandstones of the overlying Crackington Formation above the mudstones with less than 10% sandstone in the underlying Dowhills Mudstone Formation.

Doghole Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DHMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41583
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41584
has lithology component: DHMR MDST
has lithology component: DHMR SDST
has source info: DHMR_49029
has source info: DHMR_52618
has source info: DHMR_52858
has obsolete equivalent: DHMR mn 1274
broader: PLCM
has lower boundary definition: The lower boundary in the Mary Ann Opencast Borehole (SD83SW/78), is taken at the base of a silty sandstone of the Doghole Rock, that lies above the Doghole Coal.
has geographical distribution: Burnley [SD 83 32] to Ightenhill [SD 81 34] areas.
has lithology description: Sandstone, highly siliceous, with subordinate mudstone.
has thickness description: 4.2m
has upper boundary definition: The upper boundary in the Mary Ann Opencast Borehole (SD83SW/78), is taken at the base of a silty sandstone of the Doghole Rider Coal, a thin coal at the base of a shale-dominated sequence overlying the Doghole Rock.

Dornoch Mudstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: DHMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: Dornoch Formation

Dhoon Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: DHN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: DHN GD
broader: MANXG

Dalmahoy Sill
type: Concept
in scheme: NamedRockUnit
alternative label: DHOY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: DHOY DOLR
broader: LAFAS

Deerhope Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DHP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DHP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41585
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41586
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41587
has lithology component: DHP MDST
has lithology component: DHP SLST
has source info: DHP_48654
has source info: DHP_49222
has source info: DHP_49223
has source info: DHP_49784
has source info: DHP_50454
has source info: DHP_51092
has source info: DHP_51262
has source info: DHP_51491
has obsolete equivalent: DHP mn 4430
has obsolete equivalent: DHP mn 4433
has obsolete equivalent: DHP mn 4440
has obsolete equivalent: DHP mn 4431
has obsolete equivalent: DHP mn 4439
broader: NSK
has lower boundary definition: Conformable: at grey shales overlying highest Reservoir Formation, sandy siltstone.
has geographical distribution: Pentland Hills, Midland Valley.
has lithology description: Laminated fossiliferous siltstones, mudstones and shales, no sediment coarser than siltstone, bioturbation common in fine-grained sediment. Fossils include rugose corals, brachiopods, bivalves, trilobites and pelmatozoans.
has thickness description: 390m in North Esk Inlier
has upper boundary definition: Conformable: red shales immediately underlying lowest Cock Rig Formation, medium-grained sandstones.

Doughend Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHS
has current status: CURRENT
has theme: BEDRCK
notation: DHS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
has obsolete equivalent: DHS mn 1339
broader: KNW
has additional age information: Probably Frasnian, being the lowermost part of the Kinnesswood Formation, which spans from Frasnian to Courceyan,
has thickness description: About 30m

Drumgesh Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DHSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: DHSH MDST
broader: NE

Droitwich Halite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DHT
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TC
has predominant age: TC
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41588
has lithology component: DHT GYPST
has lithology component: DHT HALI
has lithology component: DHT MDST
has source info: DHT_48671
has source info: DHT_48745
has source info: DHT_49873
has source info: DHT_51674
has obsolete equivalent: DHT mn 1313
has obsolete equivalent: DHT mn 2197
broader: SIM
has lower boundary definition: Conformable, and drawn at the abrupt or slightly gradational upward transition from reddish brown mudstone (Sidmouth Mudstone Formation, undivided) to halite at the base of the Droitwich Halite Member.
has geographical distribution: Droitwich area, Worcester Basin, west of Inkberrow Fault.
has lithology description: Halite, in thick beds up to 12m thick, interbedded with mudstone, reddish-brown, blocky ,with abundant halite nodules and veins.
has thickness description: 159m in type section
has upper boundary definition: Conformable, and drawn at the abrupt or slightly gradational upward transition from halite at the top of the Droitwich Halite Member to the reddish brown mudstone of the Sidmouth Mudstone Formation (undivided).

Dove Holes Tuff
type: Concept
in scheme: NamedRockUnit
alternative label: DHTU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DHTU TUF
broader: MDA

Diamonds Ironstone (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: PLCM

Diamicton
type: Concept
in scheme: NamedRockUnit
alternative label: DIAM
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: DIAM DIAMIT
broader: NE
has lithology description: Clay and silty clay, commonly pebbly and sandy, stiff, possibly interbedded with sand and gravel-rich lenses and rare peat. An unsorted, unstratified deposit of uncertain age; colour variable, generally reflecting nature of source rock material. [Generic description: 'TMOS' Procedures].

Diatomite
type: Concept
in scheme: NamedRockUnit
alternative label: DIAT
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: DIAT DIATOM
broader: Faunal Organic Deposits
narrower: LACDI
narrower: Fluvial Diatomite
has lithology description: Siliceous deposit of lacustrine origin, soft, consisting mainly of opaline diatom frustules. [Generic description: 'TMOS' Procedures].

Dinwoodie Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DIB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DIB MDST
broader: TYLS

Dicky Gobbler Coal (South Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DICG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DICG COAL
broader: NE

Dicky Hare Semipelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: DICH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DicH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41589
has lithology component: DICH PEL
has lithology component: DICH PSAMM
has lithology component: DICH SEMPEL
has source info: DICH_48670
has source info: DICH_49235
has source info: DICH_50001
has source info: DICH_51142
has obsolete equivalent: DICH mn 1255
has obsolete equivalent: DICH mn 1256
has obsolete equivalent: DICH mn 4577
broader: Cullen Quartzite Formation
has lower boundary definition: Rapid transition from thin-bedded quartzite of Logie Head Quartzite Member.
has geographical distribution: From coast at West Sands [NJ 5310 6810 - 5340 6765] as far as the southeast side of Crannoch Hill [NJ 521 664].
has lithology description: Semipelite, thin-bedded, micaceous, locally garnetiferous, and thin psammitic beds.
has thickness description: c.150m on coast section, with some repetition by folding; appears to thin inland but this may be effect of faulting
has upper boundary definition: Faulted boundary on coastal section.

Ditcheat Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: DICL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41590
has lithology component: DICL CLAY
has lithology component: DICL SILT
has lithology component: DICL SLST
has source info: DICL_49793
has source info: DICL_50671
has source info: DICL_52466
has obsolete equivalent: DICL mn 379
has obsolete equivalent: DICL mn 2608
broader: Charmouth Mudstone Formation
has lower boundary definition: Upward change from dominantly limestone succession of Spargrove Limestone or, where absent, from the dark grey mudstones of the Pylle Clay.
has geographical distribution: From Wraxhall [ST 600 365] in west (limit of current mapping) in an arc north-eastwards through Milton Clevedon to north of Stoney Stratton.
has lithology description: Silty clays and silts
has thickness description: 40-60m
has upper boundary definition: Somewhat transitional, but marked by upward passage into fine-grained sandy clays of the Pennard Sand Member.

Dilhorne Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: DICO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DICO COAL
broader: PLCM

Dinas Dolerite
type: Concept
in scheme: NamedRockUnit
alternative label: DIDO
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: DIDO MCGB
has source info: DIDO_50909
broader: NA
has lower boundary definition: Not seen.
has geographical distribution: Not specified.
has lithology description: Highly altered olivine microgabbro
has thickness description: Unknown.
has upper boundary definition: Not seen.

Diebidale Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DIEP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AP
has predominant age: AP
has youngest age: AP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41591
has lithology component: DIEP PEL
has lithology component: DIEP PSAMM
has lithology component: DIEP SEMPEL
has source info: DIEP_52150
has source info: DIEP_52568
has obsolete equivalent: DIEP mn 4444
broader: MORR
has lower boundary definition: Overlies the Crom Psammitic Formation, defined as where predominantly psammitic lithologies pass into predominantly pelitic lithologies.
has geographical distribution: Surrounds the northern part of the Carn Chuinneag intrusion, forming a nearly continuous outcrop from Glen Diebidale (NH440830), to the western end of the Dornoch Firth (around NH560890), to Kildermorie Forest (NH470790), its southerly extent apparently thinning out near Beinn nan Eun (NH448760).
has lithology description: Massive, schistose, garnet-mica bearing pelite and semipelite, with calc-silsicate bands, increasingly pelitic towards the top.
has thickness description: Not recorded.
has upper boundary definition: The upper boundary cannot be seen, as it is obscured by the Carn Chuinneag-Inchbae Granite Gneiss Intrusion.

Digg Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DIGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: SFSH
has additional age information: Middle Oxfordian.

Dirrington Great Law Sill
type: Concept
in scheme: NamedRockUnit
alternative label: DIGT
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: DIGT FELS
broader: MVFTW

Dinas Island Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DIIS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: DIIS MDST
has lithology component: DIIS SDST
broader: NE
narrower: Carreg Bica Mudstone Member
narrower: Cwm Degwel Mudstone Member
narrower: Godir Tudur Mudstone Member
narrower: PGMU
narrower: Craig Yr Odyn Mudstone Member
narrower: PYGML
narrower: PYGMU
narrower: PYGT
narrower: NPMU
narrower: Godir Rhyg Mudstone Member
narrower: Aber Pensidian Mudstone Member
narrower: TPMU
narrower: TYBM

Dilhorne Coal (Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DILC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DILC COAL
broader: PLCM

Dingle Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DIM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DIM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41592
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41593
has lithology component: DIM MDST
has lithology component: DIM SDST
broader: Bailey Hill Formation
has lower boundary definition: Passage down into fissile largely hemipelagic Gyfennie Wood Shales Member of the Nantglyn Flags Formation.
has geographical distribution: Around Newtown.
has lithology description: Mudstone, homogeneous, medium-grey with common thin (<05cm) fine-grained sandstone layers. Commonly parallel laminated.
has thickness description: 0-150m.
has upper boundary definition: At abrupt onset of thicker (>30cm) fine-grained sandstones, commonly defined also by a lenticular bed of intraformational conglomerate.

Diamond Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: DIMND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DIMND COAL
broader: NE

Dimlington Silts
type: Concept
in scheme: NamedRockUnit
alternative label: DIMS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: DIMS SANDU
has lithology component: DIMS SILT
broader: NE
has lithology description: Sand and silt; laminated; thought to be water-lain (possibly lacustrine). [Generic description: academic papers and BGS Memoirs].

Dinantian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DINA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
broader: NP

Dinantian Volcanic Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DINV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
broader: NE

Diseworth Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DIS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DIS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TD
has predominant age: TD
has youngest age: TD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41594
has lithology component: DIS MDST
has lithology component: DIS SDST
has lithology component: DIS SLST
has source info: DIS_50020
has source info: DIS_50023
has obsolete equivalent: DIS mn 1265
broader: Gunthorpe Member
has lower boundary definition: The base is defined by green siltstone or sandstone overlying red mudstone of the undivided Gunthorpe Formation.
has geographical distribution: South Derbyshire - north-west Leicestershire.
has lithology description: Pale greenish grey siltstone and fine-grained sandstone; parallel lamination, cross lamination, load structures and convolute bedding.
has thickness description: 2-4m
has upper boundary definition: The top is defined by red mudstone of the undivided Gunthorpe Formation overlying green siltstone or sandstone.

Discovery Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: DISC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DISC COAL
has lateral equivalent: DISC st 280
broader: NE

Drumlish Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DISH
has current status: CURRENT
has theme: BEDRCK
notation: DISH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41595
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41596
has lithology component: DISH CONG
has lithology component: DISH SDST
has source info: DISH_48676
has source info: DISH_49803
has source info: DISH_51818
has obsolete equivalent: DISH mn 1322
broader: SBG
has lower boundary definition: Abrupt and probably disconformable on the Drumgivery Limestone Member, at top of Tullanaglare Mudstone Formation.
has geographical distribution: Milltown Segment of the Fintona Block, Northern Ireland.
has lithology description: Conglomerate, grey-purple, massive beds with cobbles and pebbles of volcanic and metamorphic origin; volcaniclastic, coarse sand matrix, channels cross-bedded; sandstone, purple-red, coarse-grained.
has thickness description: At least 1000m.
has upper boundary definition: Not exposed; faulted out.

Distinkhorn Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: DISK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: DISK DI
broader: SSCGR
narrower: TNHL

Distinkhorn Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: DISKD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: SDCAD

Dittisham Member
type: Concept
in scheme: NamedRockUnit
alternative label: DIT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DI
has lithology component: DIT LMST
has lithology component: DIT MDST
broader: NOSL

Diver Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DIV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DIV COAL
broader: LSC

Dyneley Knoll Flags
type: Concept
in scheme: NamedRockUnit
alternative label: DK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DK SDST
broader: PLCM

Drumchorick Siltstone Formation, Benbulben Shale Formation And Tubbrid Sandstone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DKBT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has lithology component: DKBT CALSST
has lithology component: DKBT CAMDST
has lithology component: DKBT LMST
has lithology component: DKBT MDST
has lithology component: DKBT SDST
has lithology component: DKBT SLST
broader: TYRO
has lithology description: See the Lithology descriptions for the component formations.

Dumbreck Cloven Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: DKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DKC COAL
broader: LSC

Drummuck Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: DKG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DKG
has revision number: 1
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41597
has lithology component: DKG CONG
has lithology component: DKG CSSST
has lithology component: DKG MDST
has lithology component: DKG SDST
has source info: DKG_49247
has source info: DKG_50759
has source info: DKG_51411
has source info: DKG_52143
has source info: DKG_52235
has source info: DKG_52310
has source info: DKG_52906
has obsolete equivalent: DKG mn 1324
has obsolete equivalent: DKG mn 1323
has obsolete equivalent: DKG mn 4265
broader: Ardmillan Group
narrower: LBM
narrower: HMS
narrower: QHF
narrower: STHV
narrower: Auldthorns Formation
has lower boundary definition: Drawn at base of basal conglomerate of the Auldthorns Formation where this rests conformably on alternating shales and sandstone of the Shalloch Formation.
has geographical distribution: Confined to Craighead Inlier, Ayrshire, Scotland.
has lithology description: Consists mainly of mudstones, some olive-green in colour, with sandy beds and basal conglomerate or grit.
has thickness description: c.380m
has upper boundary definition: Drawn at unconformity at base of Silurian Mulloch Hill Conglomerate.

Dirk Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DKSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KZ
broader: KC

Drumchorick Siltstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DKSF
has current status: CURRENT
has theme: BEDRCK
notation: DKSF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41598
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41599
has lithology component: DKSF CALSST
has lithology component: DKSF LMST
has lithology component: DKSF MDST
has lithology component: DKSF SLST
has source info: DKSF_49803
has source info: DKSF_51623
has obsolete equivalent: DKSF mn 2086
has obsolete equivalent: DKSF mn 1321
broader: TYRO
has lower boundary definition: Conformable abrupt change from top sandstone stratum of Mullaghmore Sandstone Formation.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Siltstone, dark grey, calcareous, micaceous, sandy, bioturbated, fossiliferous, interbedded with mudstone and thin, commonly lenticular, calcareous sandstone and limestone, with thin beds of crinoidal calciturbidites.
has thickness description: 90m
has upper boundary definition: Gradational upwards, conformable, with predominantly calcareous mudstones of Benbulben Shale Formation.

Devoke Water Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DKT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DkT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41600
has lithology component: DKT BALTF
has lithology component: DKT BATUF
has source info: DKT_48926
has source info: DKT_50725
has source info: DKT_53059
has obsolete equivalent: DKT mn 1253
broader: Birker Fell Andesite Formation
has lower boundary definition: Overlies Skiddaw Group in type area where it is the lowest Member of the Birker Fell Andesite Formation (and of the BVG). On Latterbarrow overlies the Latterbarrow Sandstone, where the base of the Devoke Water Tuff Member is taken at the bed of lapilli-tuff overlying sandstone.
has geographical distribution: Devoke Water, Cumbria (SD 14 96); Whincop, Eskdale (SD 18 99) and Stony Tarn (NY 20 02); roof pendants above Eskdale Granite (around NY 185 016), Cumbria; also on Latterbarrow-Town Bank, north of Gosforth, Cumbria (NY07 10).
has lithology description: Weakly bedded and cross-bedded lapilli-tuff and tuff of basaltic/basaltic andesite composition; locally intruded by penecontemporaneous sills; pyroclasts include abundant Skiddaw Group mudstone and sandstone.
has thickness description: 550 - 620m; complete thickness unknown because of faulting.
has upper boundary definition: At change to basaltic/basaltic andesite flows of Birkby Fell Member, or to overlying andesite sheets of Birker Fell Andesite Formation (undivided).

Dalton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DlF
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41238
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41239
has lithology component: DLB CARN
has lithology component: DLB LMST
has lithology component: DLB MDST
has lithology component: DLB SLST
has source info: DLB_48699
has source info: DLB_49785
has source info: DLB_52237
has obsolete equivalent: DLB mn 1214
broader: Great Scar Limestone Group
narrower: Lower Dalton Beds
narrower: Middle Dalton Beds
narrower: Upper Dalton Beds
narrower: Gastropod Beds
narrower: Clisiophyllum Multiseptatum Band
has lower boundary definition: At siltstone parting at top of Redhill Limestone Formation, exposed in road-cutting on north side of Elliscales roundabout on Dalton bypass, A590, Furness.
has geographical distribution: South Cumbria, north Lancashire.
has lithology description: At base, mid to dark grey even-bedded carbonate grainstones and packstones; middle part, dark grey thinly bedded packstones and wackestones with many shaly interbeds; upper part, even bedded packstones and grainstones.
has thickness description: 90-255m
has upper boundary definition: Base of overlying Park Limestone.

Lower Dalton Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DLBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
broader: Dalton Formation

Middle Dalton Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DLBM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
broader: Dalton Formation

Delnabo Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLBO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DLBO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41240
has lithology component: DLBO BREC
has lithology component: DLBO CONG
has lithology component: DLBO SDST
has source info: DLBO_51514
has source info: DLBO_52849
broader: TOMI
has lower boundary definition: Base rests unconformable upon Dalradian metasedimentary rocks.
has geographical distribution: The Tomintoul Old Red Sandstone outlier of upper Banffshire - a 50 sq km outlier about 15 by 5km in extent, which is totally separated from other Old Red Sandstone outcrops of the northeast Grampian area.
has lithology description: Coarse conglomerate and subsidiary arkosic sandstone, purple-red to red-brown. Coarse breccia and breccio-conglomerate at base locally.
has thickness description: 250m+
has upper boundary definition: Sedimentary transition into Raebeg Sandstone Formation.

Delabole Member
type: Concept
in scheme: NamedRockUnit
alternative label: DLBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DlbM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41241
has lithology component: DLBS SLTE
has source info: DLBS_48932
has source info: DLBS_50013
has source info: DLBS_50823
has source info: DLBS_51557
has lateral equivalent: DLBS st 521
has obsolete equivalent: DLBS mn 3279
has obsolete equivalent: DLBS mn 1236
broader: TSL
has additional age information: U. Palmatolepsis marginifera to L. Velifer Biozone.
has lower boundary definition: Gradational with the Tredorn Slate Formation.
has geographical distribution: Isolated exposures in the vicinity of Delabole village, north Cornwall.
has lithology description: Bluish grey slate within the Tredorn Slate Formation.
has thickness description: 30 to 50m (estimated structural thickness).
has upper boundary definition: Gradational with the Tredorn Slate Formation.

Upper Dalton Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DLBU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
broader: Dalton Formation
has lower boundary definition: Not defined.
has geographical distribution: Not defined.
has lithology description: Not defined.
has thickness description: Not defined.
has upper boundary definition: Not defined.

Dalmellington Lower Diamond Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DLD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DLD COAL
broader: MCMS

Blair Atholl Dark Limestone And Dark Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLDS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BADL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41242
has lithology component: DLDS LMST
has lithology component: DLDS MDOLO
has lithology component: DLDS MLMST
has lithology component: DLDS PEL
has lithology component: DLDS PELGP
has lithology component: DLDS PSAMM
has lithology component: DLDS QZITE
has lithology component: DLDS SEMPEL
has source info: DLDS_49952
has source info: DLDS_50001
has source info: DLDS_50024
has source info: DLDS_51142
has source info: DLDS_51365
has source info: DLDS_51386
has source info: DLDS_51764
has source info: DLDS_52396
has obsolete equivalent: DLDS mn 1218
has obsolete equivalent: DLDS mn 1217
has obsolete equivalent: DLDS mn 4441
broader: Blair Atholl Subgroup
has lower boundary definition: Sharp boundary with semipelite and graphitic pelite of Tullochroisk Semipelite Formation.
has geographical distribution: From north shore of Loch Errochty [NN 710 660] almost continuously to the Loch Tay Fault [NN 790 550 - 791 572]. East of the Loch Tay Fault and north of the Killiecrankie Slide, it occurs from Conbhar [NN 825 616] to 1km east of Forest Lodge in Glen Tilt [NN 943 743] and via Loch Moraig as far as the south end of Loch Loch [NN 988 735].
has lithology description: Lower part - grey to cream-weathering graphitic calcite limestone, with millimetre thick ribs of quartz; Central part - black, rusty-weathering, highly graphitic pelite; Upper part - grey graphitic limestone with quartz ribs, similar to lower part.
has thickness description: 1 - 120m in Sheet 55W; probably tectonically attenuated; appears to be thicker in Sheet 55E.
has upper boundary definition: Transitional, with interbanding of calcareous semipelite with thin grey limestone beds marks junction with the Cnoc an Fhithich Banded Semipelite Formation.

Dolgellau Formation And Dol-Cyn-Afon Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DLDY
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O1
has lithology component: DLDY MDST
has lithology component: DLDY SDST
has lithology component: DLDY SLMDST
has lithology component: DLDY SLST
has lithology component: DLDY VCSST
broader: MWG

Derwenlas Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DlF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: DLF AROC
has lithology component: DLF MDST
has lithology component: DLF SDST
broader: Claerwen Group

Deeside Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: litho
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41243
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41244
has lithology component: DLI CALSIR
has lithology component: DLI LMST
has lithology component: DLI MLMST
has lithology component: DLI PSAMM
has lithology component: DLI SCH
has source info: DLI_51809
has source info: DLI_53049
has obsolete equivalent: DLI mn 1233
broader: Tayvallich Subgroup
has lower boundary definition: Incoming of dominantly calcareous lithologies at the top of the Queen's Hill Formation. This is usually sharp, with only rare calc-silicate layers in the Queen's Hill Formation rocks.
has geographical distribution: Main outcrop is a 100m to 1km strip in the Dee Valley from NO 408945 (Pollagach Burn) to NO 595955 (Mains of Midstrath) (Sheets 65E and 66W). There is also an outcrop area around and to the south east of Banchory (NO 690970 to NO 745928 - Sheet 66E).
has lithology description: Dominantly calc-silicate rock, ranging from calcareous psammite to hornblende-zoisite-schist, but containing layers up to 10m thick of fine-grained crystalline limestone with disseminated sulphides.
has thickness description: Varies from 30m to 100m; probably thickens eastwards from Pollagach Burn to Mains of Midstrath.
has upper boundary definition: Change to dominant psammite, often slightly calcareous, with minor layers of calc-silicate rock and semipelite, at base of Tarfside Formation.

Darvel Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: DLLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41245
has lithology component: DLLA BAALK
has lithology component: DLLA BSN
has lithology component: DLLA TRBA
has source info: DLLA_49087
has source info: DLLA_49575
has obsolete equivalent: DLLA mn 1224
broader: Clyde Plateau Volcanic Formation
has lower boundary definition: The Darvel Lava Member is unconformable on older strata, the Swanshaw Sandstone Formation (Lower Devonian).
has geographical distribution: Dunlop-Eaglesham moors between Glasgow, Kilmarkock and Hamilton, limited area around Darvel (NS 6000 4000) and Newmilns (NS 5000 3700) just north of the Inchgottrick Fault.
has lithology description: The Darvel Lava Member consists of alkali basalts/ankaramites. Near the unit top trachybasalt also occurs.
has thickness description: Not known.
has upper boundary definition: The Member is mainly overlain by the Kirkwood Formation of the Strathclyde Group. The contact is considered unconformable with the volcaniclastic sedimentary rocks draping an eroded land surface formed from the Member. Locally (east) it is interbedded with or overlain by the Gowkstane Pyroclastic Member.

Derreens Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DLM LMST
has lithology component: DLM MDST
broader: Carraun Shale Formation

Dalradian Supergroup And Moine Supergroup (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DLMO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NA

Durham Low Main Post Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DLMP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: PMCM

Derryloran Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLN
has current status: CURRENT
has theme: BEDRCK
notation: DLN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41246
has lithology component: DLN CONG
has lithology component: DLN CSSST
has lithology component: DLN DOLMST
has lithology component: DLN SDST
has source info: DLN_48647
has source info: DLN_49981
has source info: DLN_51327
has source info: DLN_52859
has obsolete equivalent: DLN mn 1246
has obsolete equivalent: DLN mn 1247
has obsolete equivalent: DLN mn 1248
has obsolete equivalent: DLN mn 4344
broader: Armagh Group
narrower: Auglish Sandstone Member
narrower: KDS
narrower: Gortnagross Sandstone Member
has lower boundary definition: Unconformable on pre-Carboniferous basement.
has geographical distribution: South-east Tyrone, Northern Ireland.
has lithology description: Conglomerate, grit, sandstone and minor sandy dolomitic limestone.
has thickness description: 140-200m
has upper boundary definition: None

Durham Low Main Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: DLO
has current status: CURRENT
has theme: BEDRCK
notation: DLM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DLO COAL
has lateral equivalent: DLO st 446
has lateral equivalent: DLO st 492
broader: PMCM

Dolphinholme Mudstone
type: Concept
in scheme: NamedRockUnit
alternative label: DLP
has current status: CURRENT
has theme: BEDRCK
notation: Dlp
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41247
has lithology component: DLP MDST
has source info: DLP_49848
has obsolete equivalent: DLP mn 1284
broader: SAML
has lower boundary definition: Top of Accerhill Sandstone; medium- to coarse-grained sandstones with abundant plant debris, overlain sharply by the mudstone-dominated Dolphinholme Mudstone.
has geographical distribution: Ellel, Forton, Lancashire.
has lithology description: Mudstone, dark grey, with poor bivalve fauna.
has thickness description: c 60m
has upper boundary definition: Abrupt change to medium-grained, thinly bedded sandstone of the succeeding Ellel Crag Sandstone, with abundant plant debris, allochtonous coal lenses and thin siltstone interbeds.

Dalreoch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DLR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41248
has lithology component: DLR BA
has lithology component: DLR CHRT
has lithology component: DLR CONG
has lithology component: DLR MDST
has lithology component: DLR WACKE
has source info: DLR_48694
has source info: DLR_52489
has source info: DLR_52655
has obsolete equivalent: DLR mn 877
has obsolete equivalent: DLR mn 1213
broader: TAP
has lower boundary definition: Faulted.
has geographical distribution: Not defined.
has lithology description: Sandy and pebbly greywackes.
has thickness description: About 1000 m thick.
has upper boundary definition: Faulted.

Drumgrange Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: DLS LMST
has source info: DLS_52783
broader: ULGS
has geographical distribution: Known in the subsurface in the area around Dalmellington, Ayrshire.

Dulais Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DLSCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DLSCO COAL
broader: SWMCM

Duloch Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DLSS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DLSS LMST
has lithology component: DLSS SDST
broader: LLGS
has geographical distribution: The Dunfermline area of Fife, particularly near Duloch.
has thickness description: c.15m

Dalton Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DLT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DLT SDST
broader: PUCM
has lithology description: Thickly bedded soft brown sandstone.

Dirleton Plugs
type: Concept
in scheme: NamedRockUnit
alternative label: DLTON
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: DLTON BAOCM
broader: SSDLO

Dolgellau Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DLU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dlu
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41251
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41252
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41253
has lithology component: DLU MDST
has lithology component: DLU SDST
has lithology component: DLU SLMDST
has lithology component: DLU SLST
has source info: DLU_49435
has source info: DLU_50386
has source info: DLU_50647
has source info: DLU_51060
has source info: DLU_51180
has source info: DLU_52536
has source info: DLU_52990
has obsolete equivalent: DLU mn 1278
broader: MWG
has lower boundary definition: Conformably overlies sandstones of the Ffestiniog Flags Formation with a sharp to gradational contact.
has geographical distribution: Northern, eastern and southern flanks of the Harlech Dome, Snowdonia.
has lithology description: Black to dark grey laminated pyritous mudstones and laminated siltstones, carbonaceous.
has supplementary information: Raised from member of the Cwmhesgen Formation to formation status (Howells and Smith, 1997; Pratt, Woodhall and Howells 1995).
has thickness description: 35 to 150m
has upper boundary definition: Conformably and transitionally overlain by sandstones and siltstones of the Dol-Cyn-Afon Formation. At Ogof-Ddu marked by phosphatic sandstones with graptolites.

Duloch Under Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DLUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DLUL LMST
broader: PDB

Dalmellington Major Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DMA COAL
broader: MCMS

Mine Adit
type: Concept
in scheme: NamedRockUnit
alternative label: DMAD
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: UN
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Mineral Extraction (Undivided)

Drumpark Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: DMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DMB SHMDST
broader: MCMS

Drummournie Biogenic Member
type: Concept
in scheme: NamedRockUnit
alternative label: DMBG
has current status: CURRENT
has theme: SPRFCL
notation: DRM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QI
has predominant age: QI
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41255
has lithology component: DMBG CLAY
has lithology component: DMBG GRAV
has lithology component: DMBG PEAT
has lithology component: DMBG SANDU
has lithology component: DMBG SILT
has source info: DMBG_50681
has source info: DMBG_50834
has source info: DMBG_52490
has obsolete equivalent: DMBG mn 1205
broader: Dalcharn Palaeosol Formation
has lower boundary definition: Gradational contact over 10cm or so with white, clayey, silty gravel of the Rehiran Cryoturbate Member below.
has geographical distribution: Sheet 84W (Fortrose), southeast of Inverness.
has lithology description: Pebbly, sandy, clayey silt (diamicton), very dense, crudely laminated, fissile, olive grey, with wisps of white silty pebbly sand, disseminated peaty material and charcoal. Pebbles are bleached white. Containing pollen of Interglacial vegetation.
has thickness description: 0.6m
has upper boundary definition: Sharp, gently undulating, unconformable contact with stony sandy clay diamicton of the Athais Till Formation.

Douglas Main Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: DMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DMC COAL
broader: LCMS

Druim Chuibhe Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DMCB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DMCB PSMG
has lithology component: DMCB PSMGN
has lithology component: DMCB SPELGN
broader: MORR

Diamond Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DMDC
has current status: CURRENT
has theme: BEDRCK
notation: D
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DMDC COAL
broader: PLCM

Dissolution Mining
type: Concept
in scheme: NamedRockUnit
alternative label: DMDI
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: UN
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Mineral Extraction (Undivided)

Dunsmore Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: DMG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: D
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41256
has lithogenesis: GLACI
has lithology component: DMG GRAV
has lithology component: DMG SANDU
has source info: DMG_49363
has source info: DMG_50812
has source info: DMG_52088
has lateral equivalent: DMG st 320
is obsolete equivalent of: DMG FRHA
broader: NP
has lower boundary definition: Sharp, irregular and erosional upon various Anglian age Quaternary deposits that include the Oadby Till.
has geographical distribution: Patches of Dunsmore Gravel extend from just south of Leamington Hastings (SK 45 67), northwards to around Bagworth (SK 423 053).
has lithology description: Red, brown and yellow, commonly ochreous, matrix-supported flinty gravel with lenses of coarse sand. Most deposits are poorly sorted and clay-rich.Sand and gravel, clayey brown and yellow; Late Glacial to Postglacial. [Generic description: 1:50 k map margins].
has thickness description: Variable, generally from 1 - 3 m. but up to 7.8 m. proven where channelised.
has upper boundary definition: Generally the present-day land surface. The deposit may locally be covered by recent deposits such as head or alluvium. The Dunsmore Gravel is thought to grade laterally into the 'Fifth Terrace' of the river Avon.

Desertmartin Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Demesne Limestones
type: Concept
in scheme: NamedRockUnit
alternative label: DMLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DMLM LMST
has source info: DMLM_49196
has source info: DMLM_51867
broader: TYLS
has geographical distribution: Northumberland; type area around Gunnerton.

Dodman Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DMN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41259
has lithology component: DMN MMST
has lithology component: DMN MSDST
has lithology component: DMN MSLST
has source info: DMN_48898
has source info: DMN_50035
has source info: DMN_52292
has source info: DMN_52650
has obsolete equivalent: DMN mn 1269
has obsolete equivalent: DMN mn 1268
has obsolete equivalent: DMN mn 1270
broader: NA
has additional age information: ?Lower Devonian
has lower boundary definition: Dodman Thrust.
has geographical distribution: Headland between Mevagissey Bay and Veryan Bay, southeast of thrust between Hemnuck Beach and Gorran Haven, south Cornwall, Channel coast.
has lithology description: Meta-sandstone and meta-siltstone turbidite beds (to 2m) with thinner interbeds of grey meta-mudstone, which is phyllitic towards the base and schistose at the top of the exposed sequence.
has thickness description: Incomplete, c.1000m onshore.
has upper boundary definition: Unseen, offshore, but believed to be the Normannian Thrust.

Deep Main Coal (Vale Of Belvoir)
type: Concept
in scheme: NamedRockUnit
alternative label: DMNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DMNC COAL
broader: PLCM

Diamond Coal (Patna)
type: Concept
in scheme: NamedRockUnit
alternative label: DMND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41260
has lithology component: DMND COAL
broader: LSC
has additional age information: The coal overlies the Top Hosie Limestone (Brigantian to Pendleian) and underlies the Black Metals Member (Pendleian).
has geographical distribution: Patna, east Ayrshire, Scotland.
has lithology description: Coal, in two or more leaves that are recorded as up to 47 and 33 inches thick, in that part of the Limestone Coal Group sequence in the Patna area underlying the Black Metals Marine Band and above a Lingula Band.

Douglas Muir Quartz-Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DMQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41261
has lithology component: DMQ CONG
has lithology component: DMQ MDST
has lithology component: DMQ PESST
has source info: DMQ_50587
has source info: DMQ_52230
broader: LWM
has lower boundary definition: Drawn at the base of the conglomerate of the Douglas Muir Quartz Conglomerate where it rests apparently unconformably on volcaniclastic sediments of the Kirkwood Formation, as at a natural exposure at NS 5307 7752.
has geographical distribution: Strathclyde, Scotland, and north of the River Clyde eastwards from the type area at Douglas Muir [NS 525 746] to [NS 5712 7731], site of the Strathblane-Balmore Tunnel No.8 Borehole NS57NE/28, but not in the adjacent parts of the Airdrie Sheet (31W).
has lithology description: Consists mainly of hard, white conglomerates with subordinate pebbly sandstones with a few lenses of purplish-grey/grey mudstone up to 30cm thick. Trough cross-bedding is common in sets from 0.2m to 1.0m thick. Many of the units are upward fining in grain size. The clasts and pebbles are almost exclusively of vein quartz and well-rounded, averaging 2cm but up to 10cm in diameter, but some blocks of sandstone up to 15cm across are also present. Palaeocurrent directions indicate transport of the original sediments towards the southsouthwest.
has thickness description: 20m at the type locality at Douglas Muir Quarry, and up to 70m maximum elsewhere.
has upper boundary definition: The boundary is transistional, as seen at a natural exposure at NS 5730 7774, by upward passage by interbedding from conglomerate to white and pale grey sandstones of the Craigmaddie Muir Sandstones of the Lawmuir Formation.

Dartmoor Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: DMR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 2
has rock unit rank: IC
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: DMR GN
broader: NA
has lithology description: Granite.

Shallow Mine Working
type: Concept
in scheme: NamedRockUnit
alternative label: DMSH
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: UN
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Mineral Extraction (Undivided)

Dyffryn Mymbyr Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DMT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
broader: NE

Mineral Extraction (Undivided)
type: Concept
in scheme: NamedRockUnit
alternative label: DMU
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: TY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Disturbed Ground (Undivided)
narrower: Mine Adit
narrower: Dissolution Mining
narrower: Shallow Mine Working

Downend Member
type: Concept
in scheme: NamedRockUnit
alternative label: DN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41263
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41262
has lithology component: DN COAL
has lithology component: DN CONG
has lithology component: DN MDST
has lithology component: DN PESST
has lithology component: DN SDST
has source info: DN_49031
has source info: DN_49279
has source info: DN_51436
has source info: DN_52626
has lateral equivalent: DN st 266
has obsolete equivalent: DN mn 1302
has obsolete equivalent: DN st 266
broader: PES
narrower: Cambriense Marine Band
narrower: Coke Coal (Bristol Area)
narrower: LICO
narrower: Hen Coal (Bristol Area)
narrower: Cock Coal (Bristol Area)
narrower: Corston Coal (Bristol Area)
narrower: NN1C
narrower: NN2C
narrower: STKG
narrower: Garden Course Coal (Somerset)
narrower: Chick Coal (Bristol Area)
narrower: Black Coal (Bristol Area)
narrower: Globe Coal (Somerset)
has lower boundary definition: Base of member is the base of the lowest mappable lithic sandstone of "Pennant" type above the grey and red mudstone-dominated succession of the Winterbourne Formation. The base is diachronous; In the Somerset Coalfield the base of the member occurs between the Aegiranum and Cambriense Marine Beds, wheras in the Bristol Coalfield it occurs above the Cambriense Marine Band
has geographical distribution: Bristol and Somerset Coalfields
has lithology description: Sandstone with some conglomerate and pebbly sandstone and sporadic fissile mudstone beds. Some workable coal seams are also present. Sandstone is typically a coarse-grained lithic arenite of "Pennant" type
has thickness description: 660m in the Somerset Coalfield [ST75]
has upper boundary definition: The top of the Downend Member is defined at the top of the Mangotsfield Coal and associated thin fissile mudstone, overlain by the sandstone-dominated succession of the Mangotsfield

Dionide Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DNB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NE

Dun Coal (Scremerston)
type: Concept
in scheme: NamedRockUnit
alternative label: DNCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DNCL COAL
broader: SCG

Doolie Ness Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DNCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DNCO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41264
has lithology component: DNCO CONG
has lithology component: DNCO PESST
has source info: DNCO_50412
has obsolete equivalent: DNCO mn 1289
broader: Gourdon Sandstone Formation
has lower boundary definition: Not seen due to faulting.
has geographical distribution: Gourdon-Inverbervie area.
has lithology description: A clast-supported conglomerate of mainly 'Highland' provenance.
has thickness description: At least 60 m thick, full thickness not seen or proved.
has upper boundary definition: The top of the uppermost conglomerate bed in the lower part of the Gourdon Sandstone Formation.

Denend Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DNDGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41265
has lithology component: DNDGR S
has lithology component: DNDGR V
has source info: DNDGR_49716
has source info: DNDGR_49718
has source info: DNDGR_50162
has source info: DNDGR_50626
has source info: DNDGR_51721
has source info: DNDGR_52002
has source info: DNDGR_52166
has source info: DNDGR_52214
has obsolete equivalent: DNDGR DNDGR
has obsolete equivalent: DNDGR mn 1242
has obsolete equivalent: DNDGR LEY
has obsolete equivalent: DNDGR mn 2362
has obsolete equivalent: DNDGR mn 2363
is obsolete equivalent of: DNDGR DNDGR
broader: East Grampian (Albion) Glacigenic Subgroup
narrower: KTNGF
has additional age information: Anglian (?MIS 12) to Wolstonian (?MIS 8).
has lower boundary definition: The base of the unit has been observed in geological test pits within Leys Quarry (disused) to have a sharp, planar, erosional contact on olive-brown sandy diamicton of the Leys Till Formation.
has geographical distribution: Buchan, northeast Scotland. This formation is only known within the immediate vicinity of Leys Gravel Quarry (disused) (centred on NK 0040 5250) on Sheet 87W (Ellon). The unit might be regionally significant and present locally across northeast Scotland.
has lithology description: Gravel with subsidiary beds of sand. Dominantly pale olive brown and pale pinkish brown pebble-cobble-boulder gravels. Typically clast supported with medium to coarse quartzose and felsitic sand matrix. Clasts are typically subrounded and rounded and dominated by felsite with less common metasediments, red granites and mafic igneous lithologies. Sand interbeds are medium to coarse grained and both felsitic and quartzose. Locally the gravels and sands display Fe and Mn stains and cements. The deposit displays large-scale cross-beds and is locally deformed (faulted and folded by ice melt-out). Palaeocurrent analysis indicates transport to the northwest, west and southwest. Interpreted as glaciodeltaic and glaciofluvial outwash.
has thickness description: 3 - 6m
has upper boundary definition: In the northwest and northeast faces of Leys Quarry (disused) the formation is observed to have an erosional upper boundary. The overlying Pitscow Sand and Gravel Formation was deposited into a -2m deep channel eroded into the Denend Gravel Formation. In other (southern) faces of the quarry the upper boundary is the ground surface. In this situation the gravels typically display more recent periglacial disturbance (head deposits, involutions and ice-wedge casts).

Dandy Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DNDY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DNDY SDST
broader: PLCM

Dunnerdale Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DNF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DnF
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41266
has lithology component: DNF VCBR
has lithology component: DNF VCSST
has source info: DNF_49785
has source info: DNF_50154
has source info: DNF_50725
has source info: DNF_51787
has obsolete equivalent: DNF mn 1353
has obsolete equivalent: DNF mn 1354
broader: Borrowdale Volcanic Group
has lower boundary definition: Base of volcaniclastic sandstone that rests unconformably on the Wallowbarrow Tuff Formation (andesitic tuff), Ulpha Andesite Formation (andesite lava) and Holehouse Mudstone Gill Formation (mudstone and sandstone). Andesite intrusions intervene locally.
has geographical distribution: Duddon and Lickle valleys. Wallowbarrow Crag (SD 222 967) to Hotton (SD 204 902) and Lickle Valley (SD 230 920), Cumbria.
has lithology description: Volcaniclastic sandstone, locally with volcaniclastic breccia; sequence coarsens upwards. Units within this contain ichnofossils [Johnson et al, 1994].
has thickness description: 0 - 400m (excluding penecontemporaneous sills).
has upper boundary definition: Contact with overlying Lickle Formation (dacitic and rhyolitic tuff) and locally intervening intrusive basaltic andesite and andesite.

Darnley Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: DNFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41267
has lithology component: DNFC COAL
has lithology component: DNFC SDST
has source info: DNFC_51055
broader: ULGS
has lower boundary definition: Conformable.
has geographical distribution: Not defined.
has lithology description: Coal 10" - Fireclay 4' 6" - Blaes and Ironstone 8 " - Coal 7 " - Sclit 8" - Coal 5"- Fireclay 8' 0" - Sandstone. Fireclay seam.
has thickness description: 13' 10" (4m).
has upper boundary definition: Conformable.

Durness Group
type: Concept
in scheme: NamedRockUnit
alternative label: DNG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41268
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41269
has lithology component: DNG BREC
has lithology component: DNG CHRT
has lithology component: DNG DOLMST
has lithology component: DNG DOLO
has lithology component: DNG LMST
has lithology component: DNG MDST
has lithology component: DNG QZITE
has lithology component: DNG SDST
has source info: DNG_48901
has source info: DNG_49592
has source info: DNG_49989
has source info: DNG_50473
has source info: DNG_50712
has source info: DNG_51667
has source info: DNG_52035
has source info: DNG_52897
has obsolete equivalent: DNG mn 1375
has obsolete equivalent: DNG mn 1376
has obsolete equivalent: DNG mn 749
broader: NE
narrower: Eilean Dubh Formation
narrower: Eilean Dubh Formation And Ghrudaidh Formation (Undifferentiated)
narrower: Croisaphuill Formation
narrower: Durine Formation
narrower: SMH
narrower: Ghrudaidh Formation
narrower: SGM
narrower: SSLL
narrower: Balnakiel Formation
has lower boundary definition: Defined where dark grey dolostones of the Ghrudaidh Formation rest conformably upon the Salterella Grit Member of the An T'Sron Formation. The boundary is gradational over approximately a metre.
has geographical distribution: The Dunrness Group forms a narrow, discontinuous belt, extending along the North-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye.
has lithology description: Pale grey, buff and dark grey dolostones with intervals of dolomitic limestone, limestone and subordinate chert.
has thickness description: About 750m
has upper boundary definition: The stratigraphical top of the Durness Group is not seen owing to tectonic truncation by the Moine Thrust Zone in its type area.

Dun Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DNL
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41270
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41271
has lithology component: DNL CAMDST
has lithology component: DNL LMST
has source info: DNL_48975
has source info: DNL_49663
has source info: DNL_50844
has source info: DNL_52114
has source info: DNL_52562
has source info: DNL_52880
has source info: DNL_53061
has obsolete equivalent: DNL mn 2305
has obsolete equivalent: DNL mn 1341
has obsolete equivalent: DNL mn 2314
broader: TYLS
has lower boundary definition: Generally a conformable change from a thin marine mudstone overlying a thin coal or seatearth.
has geographical distribution: Confined to Berwickshire and north Northumberland in the Tyne Limestone Formation (TYLS) of the Yoredale Group (YORE). The contained marine fauna is equivalent to that of the MacGregor Marine Bands of the Midland Valley of Scotland.
has lithology description: A dark grey, argillaceous, crinoidal, shelly limestone with algal nodules, interpreted as being of marine origin, weathering to a rusty ochreous colour.
has thickness description: From 1.2m to 1.6m in the Eyemouth and north Berwickshire districts.
has upper boundary definition: Generally a conformable change to marine mudstone, which in turn passes up into deltaic arenaceous deposits of the Tyne Limestone Formation.

Doon Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DNLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DNLS LMST
broader: LLGS

Downend Member And Mangotsfield Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DNMG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DNMG SDST
has obsolete equivalent: DNMG mn 1303
broader: PES

Denton Mill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DNML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DNML LMST
broader: YORE

Dalcharn Palaeosol Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DNPS
has current status: CURRENT
has theme: SPRFCL
notation: DAL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QI
has predominant age: QI
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41272
has lithology component: DNPS CLAY
has lithology component: DNPS GRAV
has lithology component: DNPS PEAT
has lithology component: DNPS SANDU
has lithology component: DNPS SILT
has source info: DNPS_50681
has source info: DNPS_50834
has source info: DNPS_52490
has obsolete equivalent: DNPS mn 1204
broader: IAG
narrower: Drummournie Biogenic Member
narrower: RECR
has lower boundary definition: Gradational contact over 20 to 50cm with weathered, clayey cobble gravel of the Craig an Daimh Gravel Formation below.
has geographical distribution: Sheet 84W (Fortrose), SE of Inverness
has lithology description: Sandy, pebbly, clayey silt (diamicton), very dense, crudely laminated, fissile, olive grey, with wisps of white silty pebbly sand, disseminated peaty material and charcoal. Pebbles are bleached white. Containing pollen of Interglacial aspect. Passing down into clayey, sandy, silty gravel (diamicton), matrix-supported, very dense, very pale grey to white, with disseminated black charcoal and peaty material. Gravel similar in composition to that occurring in Craig an Daimh Gravel Formation below, but bleached white or pale yellow.
has thickness description: 1.6m
has upper boundary definition: Sharp, gently undulating, unconformable contact with stony sandy clay diamicton of the Athias Till Formation.

Dufton Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DNSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DnSh
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41276
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41273
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41274
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41275
has lithology component: DNSH CAMDST
has lithology component: DNSH CASLST
has lithology component: DNSH LMST
has lithology component: DNSH SDST
has lithology component: DNSH SLST
has source info: DNSH_50137
has source info: DNSH_50428
broader: Dent Group
has lower boundary definition: Taken at the base of sandstones and siltstones of the 'corona facies', overlying volcaniclastic rocks of the Harthwaite Formation [Borrowdale Volcanic Group]
has geographical distribution: Restricted to the Cross Fell Inlier, Cumbria
has lithology description: Dark grey, partly calcareous, siltstone and mudstone, with thin beds, lenticles or nodules of silty limestone. Poorly fossiliferous sandier beds occur near the top and base; at the base these include debris from the Borrowdale Volcanic Group with the commonly occuring brachiopod Trematis corona ['corona facies']
has thickness description: About 400m
has upper boundary definition: Overlain by limestones of the Swindale or Keisley limestone formations, or where these are absent, the Ashgill Formation

Dounreay Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DNSM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has obsolete equivalent: DNSM DRAY
is obsolete equivalent of: DNSM DRAY
broader: SAND

Dent Group
type: Concept
in scheme: NamedRockUnit
alternative label: DNT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DNT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41277
has lithology component: DNT CALSST
has lithology component: DNT CAMDST
has lithology component: DNT LMST
has lithology component: DNT MDST
has lithology component: DNT PYRR
has lithology component: DNT RYLAVA
has lithology component: DNT SDST
has lithology component: DNT SLST
has source info: DNT_49253
has source info: DNT_52056
has obsolete equivalent: DNT mn 1032
has obsolete equivalent: DNT mn 1033
has obsolete equivalent: DNT mn 1034
broader: WIN
narrower: Ashgill Formation
narrower: Dufton Shale Formation
narrower: Douk Ghyll Beds
narrower: HND
narrower: SOW
narrower: SWL
narrower: SWSH
narrower: YRL
narrower: KKB
narrower: KYL
narrower: High Haume Tuff Formation
narrower: Cautley Mudstone Formation And Ashgill Formation (Undifferentiated)
narrower: Cautley Mudstone Formation
narrower: NORB
narrower: SEN
narrower: Broughton Moor Formation
narrower: Appletreeworth Volcanic Formation
has lower boundary definition: Unconformably overlies the Borrowdale Volcanic Group.
has geographical distribution: Southern Lake District and north-west Pennines.
has lithology description: Varied assemblage of shallow marine clastic lithologies and limestone, pyroclastic rocks and rhyolitic lava.
has thickness description: About 100m
has upper boundary definition: Unconformably overlain by the Skelgill Formation of the Stockdale Group.

Duneaton Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DNV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DNV
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41278
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41279
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41280
has lithology component: DNV AND
has lithology component: DNV BA
has lithology component: DNV BAANDT
has lithology component: DNV LAVA
has lithology component: DNV PYRR
has lithology component: DNV TUF
has lithology component: DNV VCBR
has lithology component: DNV VCSST
has source info: DNV_51434
has source info: DNV_51673
broader: LNK
narrower: Greenhill Felsic Member
narrower: Burnhousemoor Member
has lower boundary definition: The base of the volcanic rocks seen in the Duneaton Water above the sandstones of the Swanshaw Sandstone Formation.
has geographical distribution: Between the Ayrshire and Douglas Carboniferous basins, Ayrshire and Lanarkshire, Scotland,
has lithology description: Mainly andesitic and basaltic lavas, commonly amygdaloidal, including olivine basalts, pyroxene andesites and feldsparphyric lavas with subordinate volcanic breccias, tuffs and minor sandstone interbeds.
has thickness description: Estimated to be from 440m in the reference section in the Duneaton Water tributary to at least 1200 m thick.
has upper boundary definition: The top of the pile of volcanic rocks seen in the Duneaton Water below the Auchtitench Sandstone Formation rudites and arenites.

Dolhir Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41281
has lithology component: DO LMST
has lithology component: DO MDST
has lithology component: DO SDST
has lithology component: DO SLST
has source info: DO_48696
has source info: DO_51971
has obsolete equivalent: DO mn 1279
broader: NP
narrower: Corwen Grit Member
has lower boundary definition: Unconformable on various Caradoc Formations.
has geographical distribution: Not defined.
has lithology description: Micaceous siltstones and mudstones with subsidiary sandstone and limestone bands. Variable basal limestone (Dolhir Limestone Member) to fissile mudstone (Tyn-y-Twmpath Member). Formation has rich shelly (brachiopod) fauna. Includes Corwen Grit Member at top of formation.
has thickness description: 490 metres. Lateral variations, 320 - 490 metres.
has upper boundary definition: Top of Corwen Grit Member succeeded by pale grey-green siltstones and mudstones of the Fron Frys Formation.

Doulting Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DOB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
broader: NE

Dobbin Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Douglas Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DOC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DOC COAL
broader: LCMS

Doctors Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DOCC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Do
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: DOCC COAL
broader: NE

Dougaled Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DOCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DOCO COAL
broader: SWMCM

Dove Crag Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DOCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DoCr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41282
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41283
has lithology component: DOCR ANDTFF
has lithology component: DOCR ANLTUF
has source info: DOCR_49453
has obsolete equivalent: DOCR mn 1296
broader: Deepdale Sandstone Formation
has lower boundary definition: Slight unconformity on bedded volcaniclastic sandstone (Deepdale Sandstone Formation).
has geographical distribution: Hart Crag and Dove Crag, northeastern Lake District (between Grasmere and Patterdale).
has lithology description: Andesitic lapilli-tuff and tuff, in part welded, with eutaxitic texture.
has thickness description: 45m (maximum)
has upper boundary definition: Not preserved (Hart Crag) or intruded by an andesite sill (Dove Crag).

Doe Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: DOEM
has current status: CURRENT
has theme: BEDRCK
notation: DOE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DOEM COAL
has lateral equivalent: DOEM st 262
has obsolete equivalent: DOEM mn 1271
broader: PLCM

Doethie Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOFA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has obsolete equivalent: DOFA mn 3554
broader: Cwmystwyth Grits Group

Douglas Fireclay Member
type: Concept
in scheme: NamedRockUnit
alternative label: DOFC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DOFC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41284
has lithology component: DOFC SEATM
has lithology component: DOFC SEATS
has source info: DOFC_51282
has source info: DOFC_51975
broader: PGP
has lower boundary definition: Generally underlain by fluvial sandstones of the Passage Formation.
has geographical distribution: Ayrshire.
has lithology description: Pale to dark grey seatclay and seatearth, some with high alumina properties.
has thickness description: Up to 6m
has upper boundary definition: Generally overlain by the Troon Volcanic Member of the Passage Formation.

Dolwen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DoG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41285
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41286
has lithology component: DOG CONG
has lithology component: DOG PESST
has lithology component: DOG SDST
has lithology component: DOG SLST
has source info: DOG_50003
has source info: DOG_52252
has source info: DOG_52536
has obsolete equivalent: DOG mn 1285
broader: Harlech Grits Group
has lower boundary definition: Unexposed. Seen in the Bryn-teg Borehole, the base appears to lie unconformably on rocks of the Bryn-teg Volcanic Formation.
has geographical distribution: Core of the Dolwen Pericline (upper part); lower part proved in the Bryn-teg Borehole, SH63SE/1 [SH 6992 3214] .
has lithology description: Fine- to medium-grained sandstone with siltstone, pebbly sandstone and conglomerate.
has supplementary information: Lowest part of the Harlech Grits Group.
has thickness description: 575m
has upper boundary definition: Overlain by the Llanbedr Formation. The boundary is conformable and transitional.

Dog Falls Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOGF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DOGF PSAMIF
has lithology component: DOGF PSAMM
has lithology component: DOGF SEMPEL
has lateral equivalent: DOGF st 211
broader: Glen Spean Subgroup

Doonbought Plug
type: Concept
in scheme: NamedRockUnit
alternative label: DOHT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Dolfawr Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dol
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41287
has lithology component: DOL MDST
has obsolete equivalent: DOL mn 3192
broader: NP
has lower boundary definition: Base of lowest laminated hemipelagite overlying the Cerig Formation.
has geographical distribution: Central Wales.
has lithology description: Thinly interbedded shelly pale green mudstones and laminated hemipelagites.
has thickness description: Up to 55 metres.
has upper boundary definition: Base of Builth Mudstones.

Dolyhir Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOLI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
broader: NP

Doagh Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DOLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DOLM LMST
broader: Carraun Shale Formation

Dowbridge Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has source info: DOMU_52697
broader: MMG
has geographical distribution: East Irish Sea Basin.

Donegal Appinite Suite
type: Concept
in scheme: NamedRockUnit
alternative label: DONA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has source info: DONA_50244
broader: NE
has additional age information: 40Ar - 39Ar on hornblendite from Kilrean appinite, 410 +/- 6 Ma (O'Connor et al., 1982).
has geographical distribution: Recognised in the Rupublic of Ireland.

Loch Doon Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: DOON
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: DOON
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41289
has lithology component: DOON DI
has lithology component: DOON GD
has lithology component: DOON GN
has lithology component: DOON MCGN
has lithology component: DOON QDI
has lithology component: DOON TO
has source info: DOON_48962
has source info: DOON_48963
has source info: DOON_49519
has source info: DOON_50098
has source info: DOON_50099
has source info: DOON_51101
has source info: DOON_51417
has source info: DOON_51618
has source info: DOON_51958
has obsolete equivalent: DOON mn 2452
has obsolete equivalent: DOON mn 2453
has obsolete equivalent: DOON mn 2451
has obsolete equivalent: DOON mn 2454
broader: SSCGR
has lower boundary definition: Intrusive.
has geographical distribution: Southern Uplands, Scotland.
has lithology description: Major zoned granitic pluton. Isotopic age 408.6 +/- 2.8 (RB-SR); 408 +/- 4 (K-Ar).
has thickness description: 'Hour-glass' shaped intrusion c. 19km x 11km with long axis orientated roughly N-S.
has upper boundary definition: Intrusive.

Doon Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: DOOND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
broader: SDCAD

Beinn Dorain Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DORA
has current status: CURRENT
has theme: BEDRCK
notation: DORA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41290
has lithology component: DORA SEMPG
has source info: DORA_51600
broader: Lochaber Subgroup
has additional age information: Neoproterozoic (Cryogenian).
has lower boundary definition: Abrupt change from the alternating muscovite-rich semipelite, psammite and quartzite of the Beinn an Dothaidh Formation to the more uniform garnetiferous semipelite rocks of the Beinn Dorain Semipelite Formation. The uppermost parts of the Beinn an Dothaidh Formation are dominantly quartzite in the area around Beinn a' Chuirn (Allt a'Chuirn Quartzite Member).
has geographical distribution: Formation occurs on Beinn Dorain, Beinn a'Chaisteil and Beinn an Dothaidh, southwest Grampians.
has lithology description: Massive, poorly-bedded garnet mica semipelite and muscovite-quartz semipelite, poor in biotite but with abundant quartz sweats. Typically weathers darker grey/brown to brown than the older Coire Daingean Formation; semipelites of the Beinn Dorain Formation are commonly steely grey on fresh surfaces and may take on a "knotted" appearance where conspicuous garnet is wrapped by phyllosilicates. Garnets are typically 3 to 4mm in diameter and always appear fresh (dark red) compared to the more commonly chloritised garnets in the Coire Daingean Formation. Magnetic susceptibility is twice that of the Coire Daingean semipelite (<0.5 cf. <0.2 mu).
has thickness description: Minimum c.130-150m.
has upper boundary definition: Not seen.

Dorback Intrusive-Complex
type: Concept
in scheme: NamedRockUnit
alternative label: DORB
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: IC
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: SSCGR

Dougaled Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DORC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DORC COAL
has lateral equivalent: DORC st 332
broader: SWMCM

Dornoch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DORN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GE
broader: MORA
narrower: Beauly Member
narrower: LDSA
narrower: Dornoch Mudstone Unit
narrower: UDSA

Downholland Silt
type: Concept
in scheme: NamedRockUnit
alternative label: DOS
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: CLSH
has lithology component: DOS CLAY
has lithology component: DOS SILT
broader: NE
has lithology description: Silt and clay, pale blue, commonly shelly. [Generic description: academic papers and BGS Memoirs].

Doupster Oil Shale
type: Concept
in scheme: NamedRockUnit
alternative label: DOSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DOSH SAPEL
broader: LLGS

Dromore Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DOSM
has current status: CURRENT
has theme: BEDRCK
notation: DOSM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41291
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41292
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41293
has lithology component: DOSM CALSST
has lithology component: DOSM LMST
has lithology component: DOSM SDST
has source info: DOSM_51295
has source info: DOSM_51623
broader: MMS
has lower boundary definition: Conformable; abrupt change from interbedded blocky mudstones, micaceous and blocky siltstones and blue-grey silty sandstones, at top of Bundoran Shale Formation, to orange weathering, thick beds of medium-grained sandstone.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, white-fawn, medium to coarse-grained, micaceous; calcareous horizons, weathering orange-brown, are friable and sparsely fossiliferous, bioturbated, cross-bedded, sporadic beds of crinoidal, sandy packstone.
has thickness description: c.20 - 25m
has upper boundary definition: Abrupt change, probably disconformable, between sandstones and overlying part of Mullaghmore Sandstone Formation, predominantly grey calcareous mudstones and thin peritidal limestones.

Dorset Stour Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOST
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41294
has lithology component: DOST C
has lithology component: DOST P
has lithology component: DOST S
has lithology component: DOST V
has lithology component: DOST Z
has source info: DOST_49332
has source info: DOST_49675
has source info: DOST_49676
has source info: DOST_50468
has source info: DOST_51536
has source info: DOST_51584
broader: SNTCA
has additional age information: Early Pleistocene to Holocene.
has lower boundary definition: The fluvial deposits rest unconformably on Jurassic, Cretaceous and Palaeogene strata.
has geographical distribution: The catchment of the Dorset Stour and its tributaries.
has lithology description: Floodplain alluvium and river terrace deposits. The floodplain alluvium comprises overbank deposits of mottled dark grey and orange organic silt, silty clay and clayey sand, and peat, overlying sand and gravel. Thirteen river terraces are preserved. The river terrace deposits comprise very sandy gravels. The clasts are sub-angular to sub-rounded, poorly sorted, up to 10cm in diameter, dominantly flint, with a little Upper Greensand chert, "sarsen" stone, vein quartz, Jurassic limestone, Chalk, and well-rounded flints from the Palaeogene, in a matrix of clayey sand. Deposits of the higher terraces are cryturbated.
has thickness description: Up to 11m, including up to 4m of alluvial overbank deposits.
has upper boundary definition: Surface.

Beinn An Dothaidh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOTH
has current status: CURRENT
has theme: BEDRCK
notation: DOTH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AC
has predominant age: AC
has youngest age: AC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41295
has lithology component: DOTH AMPHB
has lithology component: DOTH AMPSCH
has lithology component: DOTH CALSIR
has lithology component: DOTH CALSPL
has lithology component: DOTH PSAMM
has lithology component: DOTH QZITE
has lithology component: DOTH SEMPEL
has source info: DOTH_51600
broader: Lochaber Subgroup
narrower: Allt A'Chuirn Quartzite Member
has additional age information: Neoproterzoic (Cryogenian).
has lower boundary definition: Sharp change massive garnetiferous semipelite of the Coire Daingean Semipelite Formation to the alternating muscovite-rich semipelite, psammite and quartzite of the Beinn an Dothaidh Formation. A calcareous semipelite of calcsilicate-rock (c.5m thick) may be present locally at the base of the Beinn and Dothaidh Formation.
has geographical distribution: This formation is recognized across the northeastern parts of Sheet 46W west and north of Loch Lyon and also west of the Bridge Balgie Fault in upper Glen Lyon to Loch an Daimh in the western part of Sheet 46E, and southwestern part of Sheet 54E.
has lithology description: Lower part comprises a calcareous semipelite to calcsilicate rock about 5m thick, locally tremolite-bearing. The calcareous unit is succeeded by alternating layers (approximately 10 to 30cm thick) of muscovite-rich semipelite, psammite and thin quartzite. Grossular-bearing amphibolite schist and coarser plagioclase-amphibolite are locally developed within the formation. In the area around Beinn a'Chuirn, quartzite is more dominant in the uppermost parts of the Beinn an Dothaidh Formation; this unit is recogniZed as the Allt a'Chuirn Quartzite Member.
has thickness description: The formation is estimated to be about 180 to 200m thick on Beinn a'Chaisteil but is typically apparently thickened by the effects of fold duplication.
has upper boundary definition: Change to the more uniform garnetiferous semipelite rocks of the Beinn Dorain Semipelite Formation. In the area around Beinn a'Chuirn, quartzite is more dominant in the uppermost parts of the Beinn an Dothaidh Formation; this unit is recognised as the Allt a'Chuirn Quartzite Member.

Douk Ghyll Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DOU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OU
has predominant age: OU
has youngest age: OU
broader: Dent Group

Double Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DOUB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DOUB COAL
broader: PLCM

Douglasbrae Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DOUG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41296
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41297
has lithology component: DOUG LMST
has lithology component: DOUG MSDR
has lithology component: DOUG PEL
has source info: DOUG_48669
broader: Drummuir Calcareous Member
has lower boundary definition: Base of lowest thin bed of limestone in pelite matrix, within semipelites of Drummuir Calcareous Member.
has geographical distribution: Keith area from Bridge of Maisley to former Braehead Limeworks (quarries almost completely filled with refuse).
has lithology description: Thin beds of metalimestone, commonly brecciated, in a pelite matrix.
has thickness description: Approximately 20m
has upper boundary definition: Top of highest thin bed of limestone in pelite matrix, within semipelites of Drummuir Calcareous Member.

Doularg Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOUL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DOUL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41298
has lithology component: DOUL SLMDST
has source info: DOUL_52318
broader: Albany Group
narrower: Fence Member
narrower: JBL
narrower: Gorse Member [Onshore]
has lower boundary definition: Conformably overlies another part of the Albany Group.
has geographical distribution: Not defined.
has lithology description: Silty mudstones.
has thickness description: 24m+
has upper boundary definition: Faulted against the Albany Group.

Dounalt Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOUN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DOUN CALSIR
has lithology component: DOUN DOLO
has lithology component: DOUN MLMST
has lithology component: DOUN PEL
has lithology component: DOUN PSAMM
has source info: DOUN_49438
has source info: DOUN_50001
has lateral equivalent: DOUN st 504
broader: Tayvallich Subgroup

Dobbie's Vein
type: Concept
in scheme: NamedRockUnit
alternative label: DOV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41299
has source info: DOV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Dove Rock Vent
type: Concept
in scheme: NamedRockUnit
alternative label: DOVE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: DOVE
has revision number: 0
has rock unit rank: WT
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41300
has lithology component: DOVE BREC
has lithology component: DOVE TUF
has source info: DOVE_48973
has source info: DOVE_49535
has source info: DOVE_50390
has source info: DOVE_52692
broader: SSDLO
has lower boundary definition: Intrusive.
has geographical distribution: The Dunbar area.
has lithology description: A small, circular vent, consisting of an inner zone of tuff and an outer zone of partly brecciated sandstone. A small basanite intrusion in the centre is probably younger, perhaps late Carboniferous to Permian.
has thickness description: About 50 m in diameter.
has upper boundary definition: Intrusive.

Dovey Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DOVEY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41301
has lithology component: DOVEY C
has lithology component: DOVEY P
has lithology component: DOVEY S
has lithology component: DOVEY V
has lithology component: DOVEY Z
has source info: DOVEY_49174
has source info: DOVEY_51180
has source info: DOVEY_51529
has source info: DOVEY_52550
has source info: DOVEY_52747
has obsolete equivalent: DOVEY ALV
has obsolete equivalent: DOVEY HEAD
has obsolete equivalent: DOVEY RTD
has obsolete equivalent: DOVEY ALF
has obsolete equivalent: DOVEY LDE
broader: WWACA
has lower boundary definition: Sharp, unconformable and locally channelised on bedrock and Late Devensian head deposits and Welsh glacigenic deposits (including Eryri and Plynlimon till formations). Interdigitates in a complex manner with Tidal Flat Deposits (Gwynllwg Formation of Bowen, 1999) in the estuary.
has geographical distribution: The valley of the River Dovey and its tributaries (Gwynedd, Powys and Dyfed), west Wales.
has lithology description: Unconsolidated, stratified gravels, sands, silts and clays forming the alluvial deposits of the River Dovey (Afon Dyfi) and its tributaries. Includes contemporaneous head, colluvium and pedigenic deposits within the catchment area. Clasts principally consist of local, Lower Palaeozoic turbidites. Aggradational river terraces and major alluvial fans are dominated by pebble cobble gravels and medium- to coarse-grained sand; the modern floodplain is dominated by silt and clay, and locally includes lenses of peat.
has thickness description: Generally to around 10m.
has upper boundary definition: Generally the present ground surface or, locally, overlain by peat.

Downton Group
type: Concept
in scheme: NamedRockUnit
alternative label: DOW
has current status: CURRENT
has theme: BEDRCK
notation: DG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41302
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41303
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41304
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41305
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41307
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41308
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41310
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41306
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41309
has lithology component: DOW CONG
has lithology component: DOW SARCST
has lithology component: DOW SDST
has lithology component: DOW SLST
has lithology component: DOW TUF
has source info: DOW_50606
has source info: DOW_50827
has source info: DOW_50928
has source info: DOW_52413
has source info: DOW_52607
has obsolete equivalent: DOW mn 1308
broader: NE
narrower: RG
narrower: Downton Castle Sandstone Formation
narrower: TSH
narrower: TSRG
has lower boundary definition: Base of Ludlow Bone Bed Member (where present) of Downton Castle Sandstone Formation, at sharp, locally scoured junction with underlying Whitcliffe Formation (Upper) (formerly Upper Ludlow Shales) (White and Lawson, 1989).
has geographical distribution: Welsh Borderlands and West Midlands; south central and east central Wales.
has lithology description: Sandstone, mudstone, red, green, yellow and purple with thin phosphatic bone bed and tuffs.
has thickness description: 342-504m in type area (Main Outcrop of White and Lawson, 1989).
has upper boundary definition: Base of the main `Psammosteus' Limestone of the Ditton Group (Series) in Corve Dale (Ball and Dineley, 1961; White and Lawson, 1989).

Dowra Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DOWS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: DOWS SDST
broader: Bundoran Shale Formation

Doxall Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: DOXC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DOXC COAL
broader: SWMCM

Douglas Parrot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DPC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DPC COAL
broader: LCMS

Deep Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: DPCC
has current status: CURRENT
has theme: BEDRCK
notation: DP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DPCC COAL
broader: PMCM

Dunrobin Pier Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DPCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TR
has predominant age: TR
has youngest age: TR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41311
has lithology component: DPCG CONG
has lithology component: DPCG SDST
has source info: DPCG_50601
broader: Dunrobin Bay Formation [See Also Dunr]
has lower boundary definition: Unconformably overlies Triassic nodular carbonate rock of the "Stotfield Cherty Rock".
has geographical distribution: Northwest margin of the Inner Moray Firth Basin.
has lithology description: Fluvial and alluvial conglomerates with interbedded sandstones. Organic-rich horizons with palynomorphs are poorly exposed at Golspie. Most information has been gleaned from boreholes.
has thickness description: 32m
has upper boundary definition: Overlain by carbonaceous siltstone and claystone of the Dunrobin Castle Member.

Downie Point Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DPCO
has current status: CURRENT
has theme: BEDRCK
notation: DPCO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41312
has lithology component: DPCO CONG
has lithology component: DPCO SDST
has source info: DPCO_51673
has source info: DPCO_51981
has obsolete equivalent: DPCO mn 1304
has obsolete equivalent: DPCO mn 1305
broader: Dunnottar Castle Conglomerate Formation
has lower boundary definition: At the base of the lowest thick development of cobble conglomerate at Stonehaven Bay overlying brown and grey sandstones of the Carron Sandstone Formation.
has geographical distribution: Stonehaven area.
has lithology description: A conglomerate with rounded clasts up to 0.6m across, mainly of 'Highland' provenance.
has thickness description: Up to 225 m thick.
has upper boundary definition: The base of the Strathlethan Sandstone Member, which is base of the lowest volcaniclastic sandstone bed, resting on conglomerate.

Deepdale Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DPD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DPD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41313
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41314
has lithology component: DPD LPTUF
has lithology component: DPD TUF
has lithology component: DPD VCBR
has lithology component: DPD VCSST
has lithology component: DPD VLSS
has lithology component: DPD VSSTP
has source info: DPD_49453
has obsolete equivalent: DPD mn 1232
broader: Borrowdale Volcanic Group
narrower: Dove Crag Tuff Member
narrower: Cawk Cove Sandstone Member
narrower: SSC
narrower: Cockley How Tuff Member
narrower: Blake Brow Breccia Member
narrower: Blind Cove Sandstone Member
has lower boundary definition: Base of lowest sandstone, pebbly sandstone or tuff rests unconformably on the Helvellyn Tuff Formation, but locally there is overstep onto the Middle Dudd and Esk Pike Formations.
has geographical distribution: Grisedale, Deepdale and Dovedale, including Helvellyn and Fairfield, northeast Lake District, Cumbria.
has lithology description: Massive bedded units of volcaniclastic sandstone with intercalations of pebbly sandstone, breccia (both also volcaniclastic), tuff and lapilli-tuff. Includes the St Sunday Crag Member - lapilli-tuff.
has thickness description: 650m +
has upper boundary definition: Overlying strata not preserved.

Downan Point Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DPF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DPF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41315
has lithology component: DPF BALVPW
has lithology component: DPF BREC
has lithology component: DPF CHRT
has lithology component: DPF LAVA
has lithology component: DPF TUF
has source info: DPF_52489
broader: TAP
has lower boundary definition: The formation is truncated at the base by the Dove Cave Fault.
has geographical distribution: Not defined.
has lithology description: Basaltic pillow lavas interbedded with breccias, tuff and rare chert.
has thickness description: c.1500m
has upper boundary definition: The formation is truncated at the top by the Stinchar Valley Fault.

Dirt Pot Grit
type: Concept
in scheme: NamedRockUnit
alternative label: DPG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Deep Hard Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: DPHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DPHC COAL
broader: PLCM

Dunkpool Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DPL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Deer Park Andesite
type: Concept
in scheme: NamedRockUnit
alternative label: DPM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Deepmine Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DPMC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: Dm
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: DPMC COAL
broader: NE

Deer Park Shales
type: Concept
in scheme: NamedRockUnit
alternative label: DPS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
broader: NE

Deep Soft Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: DPSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DPSC COAL
broader: PLCM

Deep Soft Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DPSR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: PLCM

Doup Crag Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: DPT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DpT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41316
has lithology component: DPT ANDTFF
has lithology component: DPT ANLTUF
has lithology component: DPT PYRBRC
has source info: DPT_52532
has obsolete equivalent: DPT mn 2
broader: WOU
has lower boundary definition: Taken at the abrupt change from massive tuff/lapilli-tuff of the main part of the Woundale Tuff Formation, to bedded and cross-bedded tuff or pyroclastic breccia; the boundary is an erosion surface
has geographical distribution: Cumbria, on the west side of Woundale (NY405 056), via Doup Crag (NY419 092) and Park Head Fell (NY428 097] at the head of the Troutbeck valley to Threshtwaite Mouth [NY428 102]
has lithology description: Andesitic lapilli-tuff, interbedded with some units of pyroclastic breccia and sparse beds of tuff; bedded and cross-bedded. Interpreted as a mixture of pyroclastic surge and fallout deposits
has thickness description: Up to 200m
has upper boundary definition: An erosion surface that is either overlapped by fluviolacustrine sedimentary rocks of the Seathwaite Fell Sandstone Formation or overlain by dacite tuff and lapilli-tuff of the Glaramara Tuff

Quarff Succession And Melange
type: Concept
in scheme: NamedRockUnit
alternative label: DQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DQU CALSIR
has lithology component: DQU MLMST
has lithology component: DQU PELGN
has lithology component: DQU PSAMI
has lithology component: DQU QZITE
has lithology component: DQU SEMPEL
broader: Dalradian Supergroup
narrower: Fladdabister Limestone (?Formation)
has lithology description: The Quarff Succession and Melange are tectonic units consisting of Dalradian Supergroup metasedimentary rocks that cannot be allocated to one of the main groups.

Dunaskin Rock
type: Concept
in scheme: NamedRockUnit
alternative label: DR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DR SDST
broader: LCMS
has geographical distribution: Ayrshire - around Dunaskin, near Dalmellington.
has lithology description: Coarse-grained sandstone.

Drap Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DRAP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DRAP COAL
broader: SWMCM

Dounreay Shore Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRAY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41317
has lithology component: DRAY BMDST
has lithology component: DRAY LMST
has lithology component: DRAY SDST
has lithology component: DRAY SLST
has source info: DRAY_50645
has source info: DRAY_51428
has obsolete equivalent: DRAY DNSM
is obsolete equivalent of: DRAY DNSM
broader: Caithness Flagstone Group
has lower boundary definition: Top of uppermost medium-grained cross-bedded sandstone of the underlying, sandstone dominated cyclic sequence, of the Sandside Bay Formation.
has geographical distribution: On shore and immediately offshore of Dounreay area, Caithness, Northern Scotland.
has lithology description: Siltstone dominated rhythmic cycles of interbedded siltstone, fine-grained sandstone, bituminous mudstone and calcareous laminite limestone.
has thickness description: 155m
has upper boundary definition: Base of lowest medium-grained sandstone of the overlying, sandstone dominated, cyclic sequence of the Crosskirk Bay Formation.

Dunrobin Bay Formation [See Also Dunr]
type: Concept
in scheme: NamedRockUnit
alternative label: DRB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Drb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JE
has lithology component: DRB LMST
has lithology component: DRB SDST
has lithology component: DRB SLST
has source info: DRB_50601
has obsolete equivalent: DRB mn 1362
has lateral equivalent: DRB st 276
has obsolete equivalent: DRB mn 2602
broader: SUTH
narrower: LAWA
narrower: Dunrobin Pier Conglomerate Member
narrower: Dunrobin Castle Member

Dunrobin Castle Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRBC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DrbC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
has lithology component: DRBC MDST
has lithology component: DRBC SDST
has lithology component: DRBC SLST
has source info: DRBC_50601
broader: Dunrobin Bay Formation [See Also Dunr]

Drumbeg Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRBG
has current status: CURRENT
has theme: SPRFCL
notation: DRBG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41318
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41319
has lithology component: DRBG C
has lithology component: DRBG CZ
has lithology component: DRBG DMTN
has lithology component: DRBG S
has lithology component: DRBG V
has lithology component: DRBG Z
has source info: DRBG_49147
has source info: DRBG_49148
has source info: DRBG_50300
has source info: DRBG_51103
has obsolete equivalent: DRBG mn 1320
broader: MVG
has additional age information: Loch Lomond Stadial.
has lower boundary definition: Unconformity on bedrock or most commonly on older Quaternary strata including the Clyde Clay Formation and the Wilderness and Gartocharn Till Formation of the Midland Valley Glacigenic Subgroup. It has complex lateral relationships with the Blane Water Silt Formation into which it both grades and also is thrust laterally by glaciotectonic effects at the terminus of the Loch Lomond Stadial Ice Sheet. It also has complex contacts with the Gartocharn Till Formation for the same reason (Phillips et al., 2002).
has geographical distribution: Central Scotland; Glasgow area, Stirlingshire near, at and within the limits of the Loch Lomond Stade Ice Sheet in the Endrick, Blane and Leven valleys.
has lithology description: The standard section is contained in the Gartness Borehole (Browne and McMillan, 1989, Figure 7), 0.5 to 10.17m depth. The two typical lithological associations of the formation are fine- to locally medium-grained sand with silt layers, and silt with sand and clay layers. The sediments are reddish brown or orange. Derived marine fossils are present in the sediments. Pebbly layers are present at the top as are rare bands of diamicton up to 4cm thick. When faulting is present any adjacent bands of clay are usually sheared and contain striaited polished surfaces. The lithofacies association of the formation are typical of a deltaic environment of deposition in contact with active and decaying glacier ice.
has thickness description: Veneer to about 25m
has upper boundary definition: Unconformity below younger Quaternary strata such as the Clydebank Clay Formation but also exposed at the surface.

Druid Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DRC
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41320
has lithology component: DRC CONG
has lithology component: DRC PESST
has source info: DRC_50545
has obsolete equivalent: DRC mn 1318
has obsolete equivalent: DRC mn 1319
has lateral equivalent: DRC st 363
broader: Am Binnein Sandstone Formation
has lower boundary definition: The base of the lowest, mainly quartzite, pebble conglomerate within the Am Binnein Sandstone Formation.
has geographical distribution: Isle of Arran.
has lithology description: A coarse conglomerate with mainly quartzite boulders and some pebbly sandstones.
has thickness description: 275 m thick.
has upper boundary definition: The Top of the mainly quartzite pebble conglomerates within the Am Binnein Sandstone Formation.

Dunnottar Castle Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRCC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DRCC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41321
has lithology component: DRCC CONG
has lithology component: DRCC SDST
has source info: DRCC_48869
has source info: DRCC_50622
has source info: DRCC_51673
has source info: DRCC_51981
has obsolete equivalent: DRCC CHAV
has obsolete equivalent: DRCC mn 1305
has obsolete equivalent: DRCC SNF
broader: Dunnottar-Crawton Group
narrower: Downie Point Conglomerate Member
narrower: SNF
narrower: Castle Haven Conglomerate Member
has lower boundary definition: At the base of the lowest bed of conglomerate of 'Highland' provenance overlying the Carron Sandstone Formation.
has geographical distribution: Stonehaven area.
has lithology description: A conglomerate with boulders up to 1m across, o f mainly 'Highland' provenance, with interbedded sandstone lenses.
has thickness description: From 2385 m to 2482 m thick, according to Carroll, 1995.
has upper boundary definition: The base of the lowest lava flow in the overlying Tremuda Bay Volcanic Formation.

Drumbrick Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: DRCK SDST
broader: Boyle Sandstone Formation

Daren Rhestyn Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DRCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DRCO COAL
broader: RA

Dunnottar-Crawton Group
type: Concept
in scheme: NamedRockUnit
alternative label: DRCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DRCR
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41322
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41323
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41324
has lithology component: DRCR ANDLAV
has lithology component: DRCR BALAVA
has lithology component: DRCR CONG
has lithology component: DRCR LAVA
has lithology component: DRCR LMSTN
has lithology component: DRCR MDST
has lithology component: DRCR RYTUF
has lithology component: DRCR SDST
has lithology component: DRCR SLST
has lithology component: DRCR TRAND
has lithology component: DRCR TRBA
has lithology component: DRCR TUF
has source info: DRCR_48854
has source info: DRCR_49424
has source info: DRCR_49979
has source info: DRCR_50009
has source info: DRCR_50322
has source info: DRCR_50412
has source info: DRCR_51673
has source info: DRCR_51981
has source info: DRCR_52093
has source info: DRCR_52300
has obsolete equivalent: DRCR mn 1357
has obsolete equivalent: DRCR mn 1115
has obsolete equivalent: DRCR mn 1360
broader: NE
narrower: Dunnottar Castle Conglomerate Formation
narrower: WCO
narrower: Crawton Volcanic Formation
narrower: Gourdon Sandstone Formation
narrower: TBVF
narrower: GBC
has lower boundary definition: Base of Downie Point Conglomerate Member (Dunnottar Castle Conglomerate Formation), where thickly-bedded or massive conglomerate overlies pebbly sandstone of Carron Sandstone Formation with apparent conformity. This marks the base of a thick, conglomerate-dominated succession.
has geographical distribution: Northeastern Midland Valley of Scotland, Lintrathen to Stonehaven.
has lithology description: Conglomerate, clast-supported, with angular to well-rounded boulders, cobbles and pebbles. In the lower part these consist predominantly of lava, psammite and quartzite, but in the upper part the conglomerates are of markedly different provenance and were deposited from streams flowing in opposing directions. Poorly-sorted volcaniclastic sandstone and conglomerate are interbedded with non-volcaniclastic conglomerate. Non-volcaniclastic deposits consist of poorly-sorted conglomerate, with angular clasts, and bimodally-sorted conglomerate with rounded clasts. Flows of trachybasalt, trachyandesite and andesitic lava occur in the lower and middle parts of the group. The top of the Dunnottar-Crawton Group is characterised by the intermittent occurrence of volcanic rocks including trachybasaltic lavas and welded dacitic tuff (Lintrathen Tuff Member).
has thickness description: Variable; 3300m in the Stonehaven area, thinning southwestward to less than 1500m. Presumed to be overlapped by younger groups to the southwest.
has upper boundary definition: In the type area, this is taken as the top of the highest lava of the Crawton Volcanic Formation, where it is overlain by a clast-supported conglomerate at the base of the Arbuthnott-Garvock Group. Elsewhere it is taken as the top of the thick deposit of welded tuff (Lintrathen Tuff Member), or at the base of the lowest of the series of lavas belonging to the Arbuthnott-Garvock Group. Believed to be progressively overstepped towards the south-west by the Arbuthnott-Garvock Group.

Drefach Group
type: Concept
in scheme: NamedRockUnit
alternative label: DRE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41325
has lithology component: DRE CAMDST
has lithology component: DRE LMST
has lithology component: DRE MDST
has lithology component: DRE TFASST
has lithology component: DRE TUF
has source info: DRE_51030
broader: NA
has lower boundary definition: The lower boundary of the Group is taken at the base of the Felin Wen Formation. The boundary is not exposed, but the incoming of the Formation was previously described by Strahan et al. (1909), from outcrop in a road bank opposite the corn mill in the village of Felin Wen, which yielded Didymograptus murchisoni graptolites.
has geographical distribution: The Drefach Group crops out in a narrow belt extending from Fishguard Bay in the west to Llangadof in the east.
has lithology description: The Drefach Group comprises mudstones, limestones and tuffs of Llanvim to Caradoc age exposed on the southwestern margin of the Lower Palaeozoic Welsh Basin. In its type area, south of the village of Drefach, Carmarthenshire, the Drefach Group comprises a lower Felin Wen Formation (formally the Didymograptus murchisoni Beds) overlain by the Asaphus Ash Formation. This is succeeded in turn by the Hendre Shales Formation, Mydrim Limestone Formation and Mydrim Shales Formation (eg Strahan et al. 1909).
has thickness description: Greater than 600m in the type area.
has upper boundary definition: The upper boundary is taken at the top of the Mydrim Shales Formation. The boundary is not exposed, but in the type area is defined by a faulted contact with pale grey burrow-mottled mudstones of the Nantmel Mudstones Formation of Ashgill age.

Drumcullen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DREN
has current status: CURRENT
has theme: BEDRCK
notation: DREN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: TE
has predominant age: TE
has youngest age: TE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41326
has lithology component: DREN MDST
has lithology component: DREN SDST
has lithology component: DREN SLST
has source info: DREN_50816
broader: SSG
has lower boundary definition: Gradational decrease in proportion of red mudstone from underlying White Brae Mudstone Formation [formerly Permian Upper Marls].
has geographical distribution: Sub-surface on northwest shore of Lough Neagh and in Ballymacilroy Borehole No.1 [J0574 9761].
has lithology description: Sandstone, orange-red, very fine-to medium-grained, poorly sorted, weakly calcareous dolomitic cement, mudstone up to 25%, deep orange-brown.
has thickness description: 160-177m [525-580 ft].
has upper boundary definition: Gradational, with loss of red mudstones in succeeding Toomebridge Sandstone Formation.

Drosgol Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has lithology component: DRF MDST
has lithology component: DRF SDST
has source info: DRF_49593
has source info: DRF_50678
has obsolete equivalent: DRF mn 1315
has obsolete equivalent: DRF mn 1316
has obsolete equivalent: DRF mn 1317
broader: NA
narrower: PTM
has lower boundary definition: Conformably overlies the Nant-y-Moch Formation, the boundary being either gradational or sharp, and taken at the point where thinly interbedded mudstones and sandstones give way to massive mudstones.
has geographical distribution: Not specified.
has lithology description: Dark grey, brown to buff weathering, massive, homogenous mudstones with thick beds of sandstone locally, and evidence of penecontemporaneous slumping and dewatering.
has thickness description: 290 to 405m
has upper boundary definition: Taken at the top of the well bedded Pencerrigtewion Member, where it gives way to massive disturbed mudstones of the Bryn-glas-Formation, the boundary being gradational and apparently conformable, although likely to be a syndepositional slide plane.

Drum Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: DRFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DRFC SEATM
broader: PGP

Drummore Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRGR
has current status: CURRENT
has theme: SPRFCL
notation: DrGr
has revision number: 4
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41328
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41329
has lithology component: DRGR CLAY
has lithology component: DRGR DMTN
has lithology component: DRGR GRAV
has lithology component: DRGR SANDU
has source info: DRGR_48667
has source info: DRGR_50803
has source info: DRGR_50861
has source info: DRGR_50940
has source info: DRGR_51294
has obsolete equivalent: DRGR mn 986
has obsolete equivalent: DRGR mn 1325
broader: IAG
has lower boundary definition: Sharp, with Cassie Till Formation.
has geographical distribution: Sheet NH 74SE.
has lithology description: Clayey, sandy, gravelly diamicton containing abundant clasts of sandstone. Distinctly weathered.
has thickness description: 4.6m
has upper boundary definition: Unconformable, glacitectonic, with Clava Lodge Clay Member of the Clava Shelly Formation.

Deep Rider Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DRID
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DRID COAL
broader: PLCM

Drake Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRKE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JA
broader: Dunlin Group

Draughton Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DRL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DRL LMST
broader: NE

Drumflugh Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Dryburn Foot Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DRLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Derenenach Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: TR
has youngest age: TR
broader: NE

Dykebar Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: DRMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
broader: LWM

Drimmie Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRML
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Craighall Conglomerate Formation

Drumochter Succession
type: Concept
in scheme: NamedRockUnit
alternative label: DRMO
has current status: CURRENT
has theme: BEDRCK
notation: DR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41330
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41331
has lithology component: DRMO CALSIR
has lithology component: DRMO PSAMI
has lithology component: DRMO PSAMM
has lithology component: DRMO PSMQZ
has lithology component: DRMO QZITE
has lithology component: DRMO SEMPEL
has source info: DRMO_50027
has source info: DRMO_50555
has obsolete equivalent: DRMO DRMO
is obsolete equivalent of: DRMO DRMO
broader: Grampian Group
has lower boundary definition: Not seen.
has geographical distribution: Southeast of Loch Ericht and Glen Truim extending southwest to Loch Rannoch and northeast to Glen Tromie. In southeast part of sheet 63E [Dalwhinnie].
has lithology description: Psammite and micaceous psammite, grey and flaggy, with thin micaceous partings. To the east of the A9 road typically grey to pink quartzose psammite and interbanded psammite and micaceous psammite with prominent calc-silicate rock concretions. Minor units of semipelite, locally with associated thin quartzite beds.
has thickness description: Unknown.
has upper boundary definition: Not seen.

Drumowen Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRMS
has current status: CURRENT
has theme: BEDRCK
notation: DRMS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41332
has lithology component: DRMS SDST
has source info: DRMS_49803
broader: Ballyshannon Limestone Formation
has lower boundary definition: Below base of main sandstone are blue-grey bioclastic packstones with low sand content which increases in basal few centimetres, conformable on normal Ballyshannon Limestone Formation.
has geographical distribution: Restricted to northeast corner of the Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, fawn to pale brown and pale grey, iron-stained, micaceous, calcareous, unfossiliferous, parallel laminations, ripple cross-bedding, bioturbated, fine- to medium-grained, quartz arenite to subarkose.
has thickness description: c.2.7m
has upper boundary definition: Directly underlies micritised limestones of Ederny Limestone Member; conformable.

Draughton Shales
type: Concept
in scheme: NamedRockUnit
alternative label: DRNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Dross Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DRO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DRO COAL
broader: NE

Drowsell Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DROC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DROC COAL
broader: PMCM

Dalroy Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: DROY
has current status: CURRENT
has theme: SPRFCL
notation: DLS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41333
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41334
has lithology component: DROY SANDU
has lithology component: DROY SILT
has source info: DROY_50681
has source info: DROY_50803
has source info: DROY_50861
has source info: DROY_50940
has source info: DROY_51294
has obsolete equivalent: DROY mn 933
broader: Clava Shelly Formation
has lower boundary definition: Gradational, at colour change, (pale yellowish brown to olive grey) with Clava Lodge Clay Member, or glacitectonic boundary with Culdoich Till Member.
has geographical distribution: Sheet NH74SE.
has lithology description: Silty fine- to medium-grained, micaceous sand, containing graded beds and sparse drop-stones. Typically glacitectonised.
has thickness description: 6.1m at type section, 4.2m at section NH74SE E9
has upper boundary definition: Sharp, unconformable, glacitectonic boundary with Finglack Till Formation.

Dropping Craig Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DRP
has current status: CURRENT
has theme: BEDRCK
notation: DRP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41335
has lithology component: DRP CAMDST
has lithology component: DRP LMSTN
has lithology component: DRP SDST
has source info: DRP_51934
has obsolete equivalent: DRP mn 1314
broader: ORR
has lower boundary definition: Faulted.
has geographical distribution: Coastal section at Orroland Heugh.
has lithology description: Purplish red, commonly conglomeratic, sandstones passing up into thick red, silty and sandy marls, commonly packed with cornstone nodules.
has thickness description: 25m
has upper boundary definition: Faulted.

Drumchastle Pale Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DrPL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41336
has lithology component: DRPL DOLO
has lithology component: DRPL LMST
has lithology component: DRPL MDOLO
has lithology component: DRPL PEL
has source info: DRPL_49952
has source info: DRPL_50001
has source info: DRPL_50024
has source info: DRPL_51142
has source info: DRPL_51365
has source info: DRPL_51386
has source info: DRPL_51764
has source info: DRPL_52396
has obsolete equivalent: DRPL mn 3190
has obsolete equivalent: DRPL mn 4615
has obsolete equivalent: DRPL mn 4614
broader: Blair Atholl Subgroup
has lower boundary definition: Sharp boundary with semipelite and quartzose psammite of Cnoc an Fhithich Formation at type locality; elsewhere taken at base of transitional calc-muscovite-biotite pelite.
has geographical distribution: From east side of Errochty Synform [NN 7200 6604] discontinuously to core of the Allt Mor synform [NN7688 5453]. East of Loch Tay Fault and north of Killiecrankie Slide, it occurs west of Creag Chlacharnach [NN 980 675] and in Glen Tilt [NN 888 680 - 896 713 and NN 912 713 - 944 743 - 920 705].
has lithology description: Pale buff granular limestone at base, overlain by tremolite-biotite pelite, pale dolomitic limestone and green tremolite-biotite limestone.
has thickness description: 0 - 30m in Sheet 55W; probably considerably tectonically attenuated.
has upper boundary definition: Transitional boundary via 5m bed of biotite calc-pelite between green tremolite-biotite limestone and carious-weathering calcareous diamictite.

Dumblar Rigg Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DRS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has lithology component: DRS SDST
broader: Fell Sandstone Formation
has geographical distribution: Locally in the area of the Bewcastle sheet, Cumbria.

Drygill Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DrSh
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OL
has predominant age: OL
has youngest age: OL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41337
has lithology component: DRSH MDST
has source info: DRSH_49423
has source info: DRSH_51085
has obsolete equivalent: DRSH mn 1334
broader: WIN
has lower boundary definition: Not seen: faulted.
has geographical distribution: Confined entirely to a small outlier on north side of Carrock Fell (Lake District), Cumbria, British Geological Survey, 1:50k sheet 23 (Cockermouth).
has lithology description: Mudstone and shale, grey to black, calcareous, fossiliferous. Locally extensively bleached.
has thickness description: Approximately 200m exposed; true total thickness not known.
has upper boundary definition: Not seen.

Dorrery Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRSM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has obsolete equivalent: DRSM mn 1291
broader: LYBR

Druim Na Saille Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DRSP AMPHB
has lithology component: DRSP PEL
has lithology component: DRSP PSAMM
has lithology component: DRSP PSMGN
has lithology component: DRSP QZITE
has lithology component: DRSP SPELGN
has source info: DRSP_48861
has source info: DRSP_48862
has source info: DRSP_50429
broader: Glenfinnan Group

Devon Red Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DRST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41338
has lithology component: DRST SDST
has source info: DRST_49815
broader: NE
has lower boundary definition: Diachronous; boundary lithologically defined.
has geographical distribution: Not defined.
has lithology description: Sandstone.
has thickness description: 36m.
has upper boundary definition: Diachronous; boundary lithologically defined.

Dartington Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has lithology component: DRTL LMST
broader: NOSL

Dartmouth Group
type: Concept
in scheme: NamedRockUnit
alternative label: DRTM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Drtm
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41339
has lithology component: DRTM HY
has lithology component: DRTM LAVA
has lithology component: DRTM MDST
has lithology component: DRTM SDST
has lithology component: DRTM SLST
has lithology component: DRTM TUF
has source info: DRTM_49072
has source info: DRTM_50212
has source info: DRTM_52133
has source info: DRTM_52775
has lateral equivalent: DRTM WTD
has obsolete equivalent: DRTM mn 1223
has obsolete equivalent: DRTM mn 4161
has obsolete equivalent: DRTM mn 4163
has lateral equivalent: DRTM BIN
has obsolete equivalent: DRTM mn 1222
has obsolete equivalent: DRTM mn 4157
has obsolete equivalent: DRTM mn 4162
is obsolete equivalent of: DRTM WTD
is obsolete equivalent of: DRTM BIN
broader: NA
narrower: WTD
narrower: Bin Down Formation
has additional age information: ?Lockovian to Pragian.
has lower boundary definition: This is a thrust-fault contact; this unit forms the hanging walls of two thrusts to the west of the Cawsand Fault. The thrusts are dextrally displaced by the Portnadler, Portwrinkle and Rame Faults, and place the Dartmouth Group on top of the Bovisand Formation of the Meadfoot Group. In the field, the lower boundary of the Dartmouth Group is distinguished by an abrupt transition from grey slaty mudstone with thin interbeds of grey-green siltstone and fine-grained sandstone of the Meadfoot Group at the fault plane, up into reddish purple mudstone and green silty mudstone to muddy siltstone of the Dartmouth Group.
has geographical distribution: Within the Variscan outcrop in southwest England, the Dartmouth Group forms an approximately east-west trending band, between Watergate Bay [SW 8335 6519] on the north Cornwall coast to Scabbacombe Head [SX 9224 5119] on the east coast of south Devon.
has lithology description: In the Plymouth region, the Dartmouth Group is divided into the Whitsand Bay Formation and the Bin Down Formation; this is an intercalation towards the top of the Whitsand Bay Formation. The Whitsand Bay Formation comprises reddish purple mudstone and silty mudstone (beds commonly up to 2m thick), green silty mudstone to muddy siltstone (with bedding units of between 5 to 10m thick), green to mauve siltstone (in massive beds up to 6m thick that are predominantly structureless but have local lenses and laminae), grey-green with some purple sandstone (beds up to 0.8m thick with local conglomerate above erosional bases) and off-white to pale green quartzite (isolated beds up to 0.5m thick, with some grading and low-angle cross lamination). The Bin Down Formation includes grey to dark grey cleaved mudstone, grey siltstone (laminated in place) and pale grey quartzitic sandstone. Interbedded with these sedimentary rocks are basaltic lavas and volcaniclastic beds including tuff and hyaloclastite.
has thickness description: To 3300m
has upper boundary definition: This is a transitional boundary with the overlying Bovisand Formation of the Meadfoot Group. The contact is seen at Tregantle Cliffs [SX 388 526], where the uppermost strata of the Whitsand Bay Formation of the Dartmouth Group comprise interbedded red and green slaty mudstone with sporadic thin quartzose sandstone beds and grey slaty mudstone; this sequence is succeeded by rocks of the overlying Bovisand Formation, which comprise bioturbated grey mudstone with sandstone laminae, thin beds and load casts and black phosphatic nodules. Near Oldhouse Cove [SX 367 536] the contact is expressed as an upward passage into grey slaty mudstone with thin interbeds of grey-green siltstone and fine sandstone, with dark grey mudstone becoming predominant over an interval of 20m.

Drumard Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CT
has predominant age: CT
has youngest age: CT
broader: NE

Drumarg Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRUA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: NE

Drummuir Calcareous Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRUC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41340
has lithology component: DRUC MLMST
has lithology component: DRUC PEL
has lithology component: DRUC PSAMM
has lithology component: DRUC QZITE
has lithology component: DRUC SEMPEL
has lithology component: DRUC SPPH
broader: PCFL
narrower: Douglasbrae Limestone
has lower boundary definition: Lowest bed of thin limestone (where present) in upper part of Pitlurg Calcareous Flag Formation. Background lithology changes from banded calcareous psammite and semipelite to less obviously calcareous semipelite with some psammite.
has geographical distribution: Keith area, Towie to Little Ardrone.
has lithology description: Semipelite and psammite, schistose to phyllitic with many thin beds of calc-silicate rock and metalimestone.
has thickness description: up to 250m.
has upper boundary definition: Base of graphitic pelites with beds of limestone comprising the Mortlach Graphitic Schist Formation.

Drumhirk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRUM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Drumman More Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRUN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: NE

Drews Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DRWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: DRWC COAL
has lateral equivalent: DRWC st 153
broader: Grovesend Formation

Drumwhirn Member
type: Concept
in scheme: NamedRockUnit
alternative label: DRWN
has current status: CURRENT
has theme: BEDRCK
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41341
has lithology component: DRWN ARLMST
has lithology component: DRWN CAMDST
has lithology component: DRWN CASLST
has lithology component: DRWN SDST
has lithology component: DRWN SLMDST
has source info: DRWN_51445
has source info: DRWN_52517
has source info: DRWN_52627
has obsolete equivalent: DRWN mn 298
broader: Ballagan Formation
has lower boundary definition: The basal contact is faulted in the type area. The presence of grey silty mudstone and dolomitic limestone ("cementstone") interbedded with sandstone distinguishes this basal member of the Ballagan Formation from the underlying sandstone-dominated Kinnesswood Formation.
has geographical distribution: On sheets Ayr 14W and Carrick 8W, NS20SE, part of NS30SW near Dailly, South Ayrshire. The full lateral extent of the unit is not yet confirmed.
has lithology description: A white-buff and yellow medium- to fine-grained, thinly planar bedded sandstone intercalated with finely laminated grey calcareous siltstone, calcareous mudstone, grey silty mudstone and rare thin non-marine, dolomitic muddy limestone ("cementstone").
has thickness description: At least 275m at the type area, but the base is faulted. The unit is interpreted to be laterally variable in thickness.
has upper boundary definition: Mapped as a conformable contact on NS20SE in the Lindsaystone Burn section at (NS 2824 0080), but not actually exposed. Defined as the lithological change from yellow sandstone with grey silty mudstone to red-purple sandstone with conglomerate and pedogenic carbonate typical of the Lindsayston Burn Member.

Dryden Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DRY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DRY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41342
has lithology component: DRY AND
has lithology component: DRY CHRT
has lithology component: DRY MDST
has lithology component: DRY RY
has lithology component: DRY SDST
has lithology component: DRY SLST
has source info: DRY_49248
has obsolete equivalent: DRY mn 1330
has obsolete equivalent: DRY mn 1331
has obsolete equivalent: DRY mn 1332
broader: RHN
narrower: RHNC
has lower boundary definition: Change from dominantly arenaceous to dominantly argillaceous lithologies.
has geographical distribution: Not defined.
has lithology description: Brownish green shales and siltstones with a few sandstone bands; contains interbedded chert and rhyolitic to andesitic lava and ash at NJ 494 277, near Windyfield.
has thickness description: Approx. 260 metres in type section, but not seen; probably approx. 800 metres present in Castlehill (NJ 515 283) area.
has upper boundary definition: Removed by erosion.

Dryden Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DRYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: DRYL LMST
broader: NE

Dores Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Dun Scalpsie Banded Amphibolite
type: Concept
in scheme: NamedRockUnit
alternative label: DSBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OR
broader: Highland Border Ophiolite-Complex
has additional age information: Early Cambrian to Early Ordovician. Temporarily the latter limit is coded pragmatically as "Arenig".
has supplementary information: The unit is currently unclassified within the Highland Border Ophialite-Complex pending recognition and adoption of unit types for tectono-metamorphic units.

Douglas Splint Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: DSC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DSC COAL
broader: LCMS

Dunside Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DSD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DSD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41344
has lithology component: DSD MDST
has lithology component: DSD SDST
has lithology component: DSD SLST
has source info: DSD_48677
has source info: DSD_52494
broader: PRH
has lower boundary definition: Transition from silty mudstones of Blaeberry Formation: taken at lowest thick sandstone bed.
has geographical distribution: Muirkirk to Strathaven area, Strathclyde region, central Scotland.
has lithology description: Greenish grey micaceous fine-grained sandstone with pale olive mudstones.
has thickness description: 35m
has upper boundary definition: Transition to greyish red sandstone and siltstone sequence of Leaze Formation.

Scatsta 'Division'
type: Concept
in scheme: NamedRockUnit
alternative label: DSE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DSE CALSIR
has lithology component: DSE QZITE
has lateral equivalent: DSE APP
broader: Dalradian Supergroup
narrower: SCAT

Den Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DSF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: DE
has youngest age: DE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41345
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41346
has lithology component: DSF CONG
has lithology component: DSF SDST
has lithology component: DSF SLST
has source info: DSF_48667
has source info: DSF_50349
has obsolete equivalent: DSF mn 1237
broader: Braemore Mudstone Formation
has lower boundary definition: Contact not exposed, but mapped as an angular unconformity on gneissose feldspathic psammite of the Rosemarkie Metamorphic Complex (Moine). Lowest beds in the sedimentary sequence are not exposed, but the oldest exposed beds are downfaulted against Rosemarkie Metamorphic Complex (Moine) rocks.
has geographical distribution: Not defined.
has lithology description: Mainly green and greenish grey calcareous flaggy siltstones with subordinate silty sandstones and sporadic thin limestones. Some maroon and grey units. Beds of red breccio-conglomerate developed at the base.
has thickness description: To c.150m
has upper boundary definition: Generally mapped as being unconformably overlain by beds of bouldery conglomerate containing well-rounded clasts of igneous and metamorphic rock including granite, gneissose psammite and porphyritic andesite. The conglomerate is assigned to the Kilmuir Conglomerate Formation (Fletcher et al, 1996). Only one exposure of the contact is known [NH7263 5359] where an apparently concordant boundary occurs between fine-grained sandstone and the overlying conglomerate.

Drumlithie Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: DL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41347
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41348
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41349
has lithogenesis: GLACI
has lithology component: DSG CLAY
has lithology component: DSG GRAV
has lithology component: DSG SANDU
has lithology component: DSG SILT
has source info: DSG_50626
broader: MDR
has lower boundary definition: Unconformable on bedrock or conformable on Mill of Forest Till Formation or Ury Silts Formation.
has geographical distribution: Howe of Mearns area and flanking the coastline between Stonehaven and the mouth of the River Dee.
has lithology description: Sand and gravel, red-brown, with clasts predominantly of Devonian sandstone, mudstone and andesite. Locally with lenses of silt and clay.
has thickness description: Very variable, generally 5 to 10m; more than 23m proved in boreholes.
has upper boundary definition: Either at the ground surface or unconformably overlain by Flandrian deposits.

Douglas Six Foot Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DSIX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DSIX COAL
broader: LSC

Desoglin Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DSL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: DSL LMST
broader: Fell Sandstone Formation

Dunsil Coal (West And South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: DSLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DSLC COAL
has lateral equivalent: DSLC BBSC
broader: PMCM

Dounans Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DSLM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41350
has lithology component: DSLM DOLO
has lithology component: DSLM LMST
has lithology component: DSLM LMSTS
has source info: DSLM_50737
has obsolete equivalent: DSLM mn 1295
broader: Highland Border Complex
has lower boundary definition: Limestone is unconformable on largely carbonated and silicafied Lime Hill Serpentinite.
has geographical distribution: Ground around Lime Craig Quarry, Aberfoyle, but possible correlations in the Highland Border Complex are known at several localities adjacent to the Highland Boundary in Scotland; eg Margie Limestone, North Esk.
has lithology description: Limestone, massive, grey, fractured and veined; dolomitised and silicified over much of outcrop. Locally fossiliferous with a trilobite - brachiopod - gastropod faunal assemblage.
has thickness description: c.20m (estimated).
has upper boundary definition: Not seen; unit has faulted and/or unconformable relationship with overlying Old Red Sandstone conglomerates and sandstones.

Doobally Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DSM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: DSM PESST
has lithology component: DSM SDST
broader: Bellavally Formation

Dalswinton Moraine Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DSMO
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41351
has lithology component: DSMO B
has lithology component: DSMO DMTN
has lithology component: DSMO S
has lithology component: DSMO V
has lithology component: DSMO Z
has source info: DSMO_51496
broader: SUDR
has additional age information: Formed during the Late Stage deglaciation of the Nith Valley towards the end of the Main Late Devensian glaciation
has lower boundary definition: Not seen: probably unconformable on Lower Palaeozoic greywacke or Permian sandstone bedrock.
has geographical distribution: Northwestern flank of the valley of the River Nith in the vicinity of the village of Dalswinton c.8km northwest of Dumfries.
has landform description: Large lateral moraine ridges rising 10-20m above the level of the floodplain of the River Nith
has lithogenesis description: Moundy Glacial Deposits (Morainic Drift)
has lithology description: Glacial diamicton, bouldery, silty and sandy; very poorly exposed.
has upper boundary definition: The Upper Boundary is the present ground surface.

Subsurface Structure (Undivided, Unrelated To Mining)
type: Concept
in scheme: NamedRockUnit
alternative label: DSR
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: TY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Disturbed Ground (Undivided)

Doubler Stones Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DSS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DSS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: DSS SDST
broader: Hebden Formation

Diamonds Ironstone And Silver Threads Ironstone (Undifferentiated) (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DSTI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DSTI FEST
broader: PLCM

Deerness Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: DSV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DsV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41355
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41356
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41357
has lithology component: DSV AGG
has lithology component: DSV BAR
has lithology component: DSV DOLR
has lithology component: DSV LAVA
has lithology component: DSV MCGBAO
has lithology component: DSV MFLAVA
has lithology component: DSV TUF
has lithology component: DSV TUFT
has source info: DSV_49292
has source info: DSV_49293
has source info: DSV_52163
has source info: DSV_52180
has obsolete equivalent: DSV mn 66
has obsolete equivalent: DSV mn 1411
has obsolete equivalent: DSV mn 1415
has obsolete equivalent: DSV mn 1414
broader: Eday Flagstone Formation
has lower boundary definition: (a) Conformable contact on Eday Flagstone, (b) Conformable contact on Eday Flagstone, (c) Conformable and cross cutting contacts within lavas.
has geographical distribution: Deerness, Tankerness, Copinsay and Shapinsay: Orkney Islands.
has lithology description: (a) Basic lava (b) Tuff and tuffaceous sandstone (c) Agglomerate extrusions associated with sills of olivine-dolerite and teschenite locally, which can be distinguished only at coastal exposure. NOTE: The recognised lithologies crop out extensively on the Deerness Peninsula, Orkney. Poor exposure makes subdivision impractical inland, though intrusive and extrusive rock types have been recognised at some sites. Where intrusive basic rocks are recognised they are excluded from the Member. The name is changed from Eday Lavas because some of the rocks are sills, the Eday Flagstone, Eday Sandstone, etc. already exist, and the volcanic rocks do not occur on Eday, which is the type site for the remainder of the Eday sequence.
has thickness description: (a) 2 flows: one >7m, second thin (0.5m) (b) 5m at Muckle Castle type section (c) unknown-thin.
has upper boundary definition: (a) Conformably overlain by tuffaceous sandstone within Eday Flagstone, (b) Conformably overlain by Eday Flagstone, (c) Conformable with Eday Flags and conformable/cross-cutting within lavas.

Douglas Three Foot Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: DTF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DTF COAL
broader: MCMS

Ditton Group
type: Concept
in scheme: NamedRockUnit
alternative label: DTG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
broader: NE

Douglas Thirty Inch Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DTI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DTI COAL
has lateral equivalent: DTI st 541
has lateral equivalent: DTI st 889
broader: LSC

Deformation Till
type: Concept
in scheme: NamedRockUnit
alternative label: DTILL
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: TILL

Duntulm Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DTM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dtm
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41358
has lithology component: DTM LMST
has lithology component: DTM MDST
has lithology component: DTM SDST
has lithology component: DTM SLST
has source info: DTM_49488
has source info: DTM_49569
has source info: DTM_49614
has obsolete equivalent: DTM mn 2502
broader: Great Estuarine Group
has lower boundary definition: Trangressive surface, drowned fluvial delta changes to marine-lagoonal facies.
has geographical distribution: Sea of the Hebrides and Inner Hebrides Basins.
has lithology description: Marine-brackish lagoonal facies dominate the formation, primarily consisting of mudstones, oyster limestones and algal limestones.
has thickness description: 8m
has upper boundary definition: Return of fresh water conditions, minor lithology change.

Dalton Limestone (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: DTNL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: DTNL LMST
broader: SMGP

Dunnet Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DTSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Dunnet Shale
type: Concept
in scheme: NamedRockUnit
alternative label: DTSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: DTSH SAPEL
broader: HON
has additional age information: Within the range Asbian to Brigantian.

Dirty Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DTYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DTYC COAL
broader: Brithdir Member

Durisdeer Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Du
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41359
has lithology component: DU BREC
has lithology component: DU MDST
has lithology component: DU SDST
has lithology component: DU SLST
has source info: DU_52156
has obsolete equivalent: DU mn 3289
broader: STEW
has lower boundary definition: Passes down into the Carron Basalt Formation.
has geographical distribution: Confined to the northern part of the Thornhill Basin between Lower Dalveen and Gateslack.
has lithology description: Sandy breccias, breccia sandstones, sandstones and rare siltstones and mudstones.
has thickness description: 50m
has upper boundary definition: Passes up by alternation into the Thornhill Sandstone Formation.

Dunbarella Bed
type: Concept
in scheme: NamedRockUnit
alternative label: DUA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41362
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41360
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41361
has lithology component: DUA CAMDST
has lithology component: DUA LMST
has source info: DUA_49284
has source info: DUA_52940
broader: Chaigley Limestone Member
has lower boundary definition: Not defined.
has geographical distribution: Craven Basin, northwest England.
has lithology description: Dark, fissile, calcareous mudstone with sporadic petroliferous, wackestone nodules - 'bullions'. Bed crowded with bivalves - 'Dunbarella' and 'Pteronites'.
has supplementary information: It is a useful marker horizon since in the southern limb of the Plantation Farm Anticline the bed lies within the Chaigley Limestone, allowing correlations with areas such as the Ashnott Anticline, where the Chaigley Limestone is absent. The bed occurs also in the Whitewell Anticline.
has thickness description: 0.2m
has upper boundary definition: Not defined.

Dumbreck Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DUBR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DUBR SDST
broader: ULGS

Dunglass Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DUC COAL
broader: MCMS

Duddon Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUCO
has current status: CURRENT
has theme: BEDRCK
notation: Dc
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41363
has lithology component: DUCO CONG
has lithology component: DUCO MDST
has lithology component: DUCO NCSLTR
has lithology component: DUCO SDST
has lithology component: DUCO SLST
has source info: DUCO_48699
has source info: DUCO_49785
broader: MASA
has lower boundary definition: At base of conglomerate sequence unconformable on the top of the Lower Palaeozoic basement.
has geographical distribution: Furness, Cumbria confined to the area of the Duddon Estuary.
has lithology description: Conglomerate, sandstone and mudstone, mainly red-brown with pale green and mottled layers. Large clasts (pebbles up to 15cm) are well rounded, commonly with thin ferruginous skins. Clast lithologies all occur locally and include Borrowdale Volcanic Group andesite, tuff and rhyolite, Silurian "grit" and "greywacke" and Eskdale Granite and Ennerdale granophyric microgranite.
has thickness description: 0 to 191m
has upper boundary definition: There is an upward change from conglomerate beds to grey, red and green marine mudstone and limestone with subordinate thin conglomerate beds. The junction may be sharply gradational or possibly an onlap surface.

Dure Clough Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DUCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DuCS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41365
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41366
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41367
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41364
has lithology component: DUCS SDST
has lithology component: DUCS SLST
has source info: DUCS_50490
has obsolete equivalent: DUCS st 277
has obsolete equivalent: DUCS mn 3201
broader: RBL
has lower boundary definition: Transitional from grey, micaceous, sandy siltstones with few thin sandstones (commonly less than 0.1m) of the Roeburndale Member (undifferentiated to the sandstone-dominated Dure Clough Sandstones.
has geographical distribution: Mapped only in the Brennand Fell area of Lancashire [SD 65] but probably more widespread. Equivalents cannot be identified elsewhere because of the absence of biostratigraphical markers.
has lithology description: Sandstones with mostly thin interbedded siltstones - a delta slope facies. Sandstone, grey, weathering orange-brown, fine- to medium-grained, micaceous, thin- to thick-bedded in packets up to c.25m thick. Siltstone, grey micaceous bed c.15m thick in the middle of the unit.
has thickness description: c. 70-100m in the Lancaster area; about 250m in the Garstang district (former Park Wood Sandstone Member).
has upper boundary definition: Sharp transition the sandstone-dominated Dure Clough Sandstones to grey micaceous siltstones with few thin sandstones (commonly less than 0.1m) of the Roeburndale Member (undifferentiated).

Dalmellington Upper Diamond Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DUD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DUD COAL
broader: MCMS

Dalmellington Upper Ell Coal (South Ayrshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DUE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DUE COAL
broader: MCMS

Dunblane Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DUF
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41368
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41369
has lithology component: DUF MDST
has lithology component: DUF PESST
has lithology component: DUF SDST
has source info: DUF_49343
has source info: DUF_51673
has source info: DUF_51981
has lateral equivalent: DUF TEF
has obsolete equivalent: DUF mn 1343
has obsolete equivalent: DUF mn 1344
broader: SCN
has lower boundary definition: Where medium- to coarse-grained sandstones overlie the top of the fine-grained sandstones and siltstones of the Buttergask Flagstone Member.
has geographical distribution: The south-east limb of the Strathmore Syncline, in the Stirling to Alloa area.
has lithology description: Purple and brown, medium- and coarse-grained sandstones, subsidiary purple mudstones and rare pebbly sandstone beds.
has thickness description: About 750 m thick.
has upper boundary definition: The base of the lowest siltstone or mudstone of the Cromlix Mudstone Formation.

Dufftown Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUFF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41370
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41371
has lithology component: DUFF DOLMST
has lithology component: DUFF LMST
has lithology component: DUFF MLMST
has source info: DUFF_49233
has source info: DUFF_49234
broader: MOGS
has lower boundary definition: At the top of the underlying calcareous phyllites and semipelites, with thin limestone laminae of the Pitlurg Formation, where they give way to uniform limestone.
has geographical distribution: Banffshire coast at Sandend southwest along strike of Dalradian Supergroup outcrop to Cairngorms.
has lithology description: Mid to dark grey, fine- to coarse-grained limestone with some dolostone; pelitic in places, but generally pure.
has thickness description: Very variable; laterally impersistent. Thickened by folding in part. In Glenrinnes c. 150m thick.
has upper boundary definition: At the top of the limestone where it gives way to pelites and semipelites of the Mortlach Graphitic Schist.

Dunnet Head Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41372
has lithology component: DUH CSSST
has lithology component: DUH SDST
has source info: DUH_48766
has source info: DUH_48827
has source info: DUH_50938
has source info: DUH_51516
has obsolete equivalent: DUH mn 1356
has obsolete equivalent: DUH mn 1355
broader: Eday Group
has lower boundary definition: Drawn where the yellow and brown sandstones of the Dunnet Head Sandstone rests unconformably on the flagstones of the Caithness Flagstone Group.
has geographical distribution: Caithness, northern Highlands. (Highland Region).
has lithology description: Unfossiliferous yellow and brown sandstones with grit beds.
has thickness description: c.733m
has upper boundary definition: The Dunnet Head Sandstone is overlain unconformably by superficial deposits.

Dunconnel Hill Plug
type: Concept
in scheme: NamedRockUnit
alternative label: DUHIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: DUHIL BARPMA
broader: SSDPC

Dunaskin Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DUK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: DUK CAMDST
has lithology component: DUK LMST
has source info: DUK_52783
broader: ULGS
has geographical distribution: One of the thickest and most persistent limestones in the Dalmellington district of Ayrshire, best development being proven in boreholes near Dunaskin.
has lithology description: Limestone with a few thin partings of calcareous mudstone.
has thickness description: Maximum of about 13m.

Duke Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DUKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DUKC COAL
broader: RA

Duke Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: DUKE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DUKE COAL
has lateral equivalent: DUKE st 550
broader: PMCM

Dulas Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DULC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DULC COAL
has lateral equivalent: DULC st 779
broader: SWMCM

Dull Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: DULL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DULL COAL
broader: PMCM

Dunnet Marls
type: Concept
in scheme: NamedRockUnit
alternative label: DUMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: DUMA CAMDST
has lithology component: DUMA SDST
has source info: DUMA_51867
broader: HON
has additional age information: Within the range Asbian to Brigantian.
has lithology description: Grey calcareous mudstones with thin ribs of brown sandstone.
has supplementary information: Overlies the Dunnet Shale(s) and overlain by the Binny Sandstone.

Dump Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: DUMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DUMB MDST
broader: NE

Drumgivery Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUML
has current status: CURRENT
has theme: BEDRCK
notation: DUML
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41373
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41374
has lithology component: DUML LMST
has source info: DUML_49804
broader: TUG
has lower boundary definition: Conformable, rapid gradation from Tullanaglare Mudstone Formation into this member.
has geographical distribution: Milltown Segment of the Fintona Block, Northern Ireland.
has lithology description: Limestone, pink, unbedded, pedogenic, unfossiliferous, micrite, with fine detrital quartz.
has thickness description: 0.3 - 0.5m
has upper boundary definition: Probably disconformable; overlain abruptly, but without apparent erosion, by coarse conglomerates of Drumlish Formation.

Dumbarton Rock Plug
type: Concept
in scheme: NamedRockUnit
alternative label: DUMRK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: DUMRK BARPOM
broader: SSDPC

Dalkeith Under Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: DUNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DUNC COAL
broader: LCMS

Dunans Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUNCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: SFSH

Dunfallandy Hill Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: DUNHI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DUNHI MIR
broader: NA

Dunion Hill Plug
type: Concept
in scheme: NamedRockUnit
alternative label: DUNI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: DUNI MCGBPP
broader: KELSO

Dunlin Group
type: Concept
in scheme: NamedRockUnit
alternative label: DUNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JA
broader: NE
narrower: Burton Formation
narrower: Drake Formation
narrower: SPEK
narrower: Cook Formation
narrower: Darwin Formation
narrower: Amundsen Formation

Dungiven Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUNN
has current status: CURRENT
has theme: BEDRCK
notation: DN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41375
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41376
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41377
has lithology component: DUNN BALVPW
has lithology component: DUNN METR
has lithology component: DUNN MLMST
has lithology component: DUNN PEL
has lithology component: DUNN PSAMM
has lithology component: DUNN QZITE
has lithology component: DUNN SCH
has lithology component: DUNN SEMPEL
has lithology component: DUNN SPGR
has source info: DUNN_48834
has source info: DUNN_49400
has obsolete equivalent: DUNN mn 1350
has obsolete equivalent: DUNN mn 1351
broader: Tayvallich Subgroup
has lower boundary definition: Not exposed.
has geographical distribution: Sperrin Mountains, Co. Londonderry, Northern Ireland.
has lithology description: Intercalated metalimestone, basic metavolcanics, graphitic and micaceous schist, quartzites and psammites.
has thickness description: Unknown
has upper boundary definition: Base of major amphibolitic green beds (Glenga Amphibolite Member) at base of Dart Formation.

Dunalastair Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUNQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DunQ
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41378
has lithology component: DUNQ PSAMM
has lithology component: DUNQ QZITE
has source info: DUNQ_50001
has source info: DUNQ_50024
has source info: DUNQ_50027
has source info: DUNQ_51142
has source info: DUNQ_51764
has obsolete equivalent: DUNQ mn 3438
has obsolete equivalent: DUNQ mn 2514
broader: Lochaber Subgroup
has lower boundary definition: Sharp contact with underlying Grampian Group psammites.
has geographical distribution: Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically in attenuated form from closure of Errochty Synform [NN 712 671] and as far east as tributary of Allt Kynachan [NN 7609 5670]. Also occurs at the culmination caused by the intersection of the Clunes and Bohespic antiforms [NN 745 633]. Not present east of the Loch Tay Fault, where it may have been tectonically excised; however some of the rocks of the 'Banvie Burn Series' may be equivalent.
has lithology description: Quartzite and quartzitic psammitic, beds 100 - 300m thick well developed; less feldspathic than Grampian Group psammites. Cross-bedding shown by feldspar-rich and heavy mineral-rich laminae.
has thickness description: 0 - 90m; probably much tectonic thinning.
has upper boundary definition: Sharp boundary with Dunalastair Semipelite Formation, marked by change from quartzite to mixed psammite and semipelite.

Dunrobin Bay Group [See Also Drb]
type: Concept
in scheme: NamedRockUnit
alternative label: DUNR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
has lateral equivalent: DUNR st 275
broader: NE
narrower: LDYW
narrower: ORRN
narrower: MANS
narrower: Golspie Formation

Dunalastair Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DunS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41379
has lithology component: DUNS PSAMM
has lithology component: DUNS QZITE
has lithology component: DUNS SEMPEL
has source info: DUNS_50001
has source info: DUNS_50024
has source info: DUNS_50027
has source info: DUNS_51142
has source info: DUNS_51764
has obsolete equivalent: DUNS mn 406
has obsolete equivalent: DUNS mn 3249
broader: Lochaber Subgroup
has lower boundary definition: Sharp boundary with Dunalastair Quartzite Formation, marked by change from quartzite to mixed psammite and semipelite.
has geographical distribution: Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically in attenuated form from closure of Errochty Synform [NN 712 671] and as far east as the Allt Kynachan [NN 7775 5723]. Also occurs at the culmination caused by the intersection of the Clunes and Bohespic antiforms [NN 745 633]. Not present east of the Loch Tay Fault, where it may have been tectonically excised; however some of the rocks of the 'Banvie Burn Series' may be equivalent.
has lithology description: Biotite-muscovite semipelite with psammitic laminae 5 - 30mm thick, giving the unit a ribbed appearance.
has thickness description: 0 - 90m; probably much tectonic thinning.
has upper boundary definition: Gradational boundary with Beoil Quartzite Formation; boundary taken at base of first quartzite rib.

Dunans Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUNSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: SFSH

Dunwich Group
type: Concept
in scheme: NamedRockUnit
alternative label: DUNW
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: NO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41380
has lithology component: DUNW CLAY
has lithology component: DUNW GRAV
has lithology component: DUNW SANDU
has lithology component: DUNW SILT
has source info: DUNW_49074
has source info: DUNW_51441
has source info: DUNW_52978
broader: Great Britain Superficial Deposits Supergroup
narrower: Bytham Catchments Subgroup
narrower: Caesar's Camp Gravel Formation
narrower: NBED
narrower: Cromer Forest Bed Formation
narrower: WHGR
narrower: KES
narrower: KGCA
narrower: LTH
narrower: STGR
narrower: Gerrards Cross Gravel Formation
has lower boundary definition: Seen as a sharp planar unconformity, resting on strata from Triassic to Pleistocene (Crag Group) in age. The unit can be distinguished from the Crag Group on the basis of the fluvial origin of the deposits of the Dunwich Group, as the Crag Group is interpreted to be marine to estuarine.
has geographical distribution: The southern limit is taken as the course of the River Thames above its point of diversion, and below that, the southern limit of the Kesgrave Catchmrnt Subgroup, i.e. a line from SU 770 830 near Marlowe to TM 120 160 near Clacton-on-Sea. There is no northern limit but no deposits are currently identified north of East Anglia and the Midlands. Farther north all such deposits could have been destroyed by the advancing ice responsible for deposition of the Albion Glacigenic Group. Offshore the delta plain sediments of he Yarmouth Roads Formation, correlated with the Cromer Forest-bed Formation, extend over the Southern and Central North Sea basins northwardsto about 55 degrees 30N 56degrees N.
has lithology description: Fluvial gravels with subsidiary sands, clays and silts. The Group comprises the interpreted fluvial terrace sequences of those rivers that were either destroyed by or, in the case of the Proto-Thames, significantly modified by, the overriding ice sheets that deposited the Albion Glacigenic Group. The pebble contents of these various gravels can be used to demonstrate the denudation history of the source areas of the sediments.
has thickness description: To c.15m
has upper boundary definition: Most commonly overlain by deposits of the Albion Glacigenic Group, from which it can be distinguished by the presence of northern-British derived errratics in the Albion Glacigenic Group. It is less commonly overlain by deposits of the Britannia Catchments Group or British Coastal Deposits Group. It also interdigitates with Crag Group deposits.

Drumskinny Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DUNY
has current status: CURRENT
has theme: BEDRCK
notation: DUNY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41381
has lithology component: DUNY MDST
has lithology component: DUNY SDST
has lithology component: DUNY SLST
has source info: DUNY_49803
has obsolete equivalent: DUNY mn 2091
broader: MMS
has lower boundary definition: Not recognised in field, occurs within Mullaghmore Sandstone Formation.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, white to fawn, feldspathic, medium- to coarse-grained, micaceous, calcareous, bioturbated, with thin siltstones and mudstones.
has thickness description: 45 - 50m
has upper boundary definition: Not recognised in field, occurs within Mullaghmore Sandstone Formation.

Dalkeith Upper Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: DUP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DUP COAL
broader: LCMS

Dunrossness Phyllitic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUPH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DUPH PEL
has lithology component: DUPH QZITE
broader: Clift Hills 'Division'

Durine Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41382
has lithology component: DUR CHRT
has lithology component: DUR DOLMST
has lithology component: DUR DOLO
has lithology component: DUR LMST
has source info: DUR_48901
has source info: DUR_49592
has source info: DUR_49989
has source info: DUR_50473
has source info: DUR_50712
has source info: DUR_51667
has source info: DUR_52035
has obsolete equivalent: DUR mn 1372
broader: Durness Group
has lower boundary definition: Conformably overlies the Croisaphuill Formation.
has geographical distribution: The Durness Group forms a narrow, discontinuous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye. The Durine Formation does not occur in Assynt or Skye and appears to be limited to the more northern parts of the Durness Group's outcrop.
has lithology description: Light grey fine-grained dolomitic limestones.
has thickness description: 80 m thick, although estimated at 200m by some authors.
has upper boundary definition: The top of the formation is tectonically truncated by the Moine Thrust Zone.

Duricrust
type: Concept
in scheme: NamedRockUnit
alternative label: DURIC
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Chemical Deposits
narrower: Calcrete
narrower: Ferricrete

Durlston Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DURN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Durn
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KZ
has predominant age: KZ
has youngest age: KZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41383
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41384
has lithology component: DURN LMST
has lithology component: DURN MDST
has source info: DURN_49490
has source info: DURN_49611
has obsolete equivalent: DURN mn 1373
broader: PB
narrower: PEP
narrower: SHO
narrower: Greys Limestones Member
has lower boundary definition: First occurrence of very shelly micrite (Cinder Bed) above more pure micrites at the top of the Lulworth Formation.
has geographical distribution: Mapped within the South Dorset area, covered by British Geological Survey 1:50 000 scale Sheets 341, 342 and 343. The unit can be defined elsewhere in southern England (e.g. elsewhere in Wessex Basin and south-east England), separated from the Lulworth Formation beneath by the Cinder Bed. Occurs in the subcrop throughout the Wessex Basin of southern Britain. Away from the type area of Dorset, the presence of the formation can be interpreted from described outcrops from the Weald, and to the west, in the Vale of Wardour in Wiltshire. It is presently identified on mapsheets E328 [Durl], (E341/342 [Durl] and E342/343) [Durl]. It is also likely to be present at depth but not depicted on E283, E284, E286, E301, and part of the Purbeck group shown on the following sheets E219 [Pb], E220 [Pb], E237 [Pb], E252 [g14], E270 [Pb], E271 [Pb], E285 [PB], E287 [g14], E288 [shown in GVS but not symbolised], E289 [shown in GVS but not symbolised], E297 [Purbeck Formation shown but only Oakley Marl Member symbolised], E298 [Pb, and Formations to be released late 2004], E299 [Pb], E300 [Pb], E302 [g14], E303 [g14], E304[g14], E305/6 [g14], E316 [pb], E317/332 [Pb], E318/333 [shown in GVS but not symbolised], E319 [g14], E320/321 [g14], E327 [g14].
has lithology description: Dominated by interbedded, shelly limestones and dark mudstones. The shell material often contains Unio and Viviparus. Detrital quartz is present through much of the formation in West Dorset (west of Stair Hole), but is confined to the Stair Hole Member in East Dorset (Worbarrow and Durlston). The Durlston Formation comprises two members in Dorset, which, in ascending order are: the Stair Hole Member and the Peveril Point Member. Elsewhere the formation is undivided, or is itself incorporated into an undivided Purbeck Limestone Group. The formation includes the informal Upper Purbeck Beds, and the upper part of the Middle Purbeck Beds, above the base of the Cinder Bed, of the traditional scheme. Within the Weald, an equivalent of the Cinder Bed has been identified, thus allowing the succession there to be considered within the formal terminology.
has thickness description: 18 to 57m
has upper boundary definition: Last occurrence of significant limestone before monotonous Wealden sandy mudstones.

Dunnet Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DUS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DUS CONG
has lithology component: DUS SAMDST
has lithology component: DUS SDST
has source info: DUS_50206
has source info: DUS_50654
has source info: DUS_51867
has source info: DUS_52346
broader: HON
has additional age information: Within the range Asbian to Brigantian.
has lower boundary definition: Overlain by the Binny Sandstone.
has geographical distribution: Variably developed in the Midland Valley of Scotland. Type area around Pumpherston, Linlithgowshire.
has lithology description: A thick group of alternating sandstones, shaly sandstones and conglomerates, with red and green marls.
has thickness description: To c.220m
has upper boundary definition: Overlies the Burdiehouse Limestone.

Dud Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: DUSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
broader: NE

Dunbar Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Dundonald Sill
type: Concept
in scheme: NamedRockUnit
alternative label: DUSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Dunrossness Spilitic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41385
has lithology component: DUSP CHRT
has lithology component: DUSP METR
has lithology component: DUSP MLAVA
has lithology component: DUSP MTUF
has lithology component: DUSP PELGP
has lithology component: DUSP QZITE
has source info: DUSP_51099
has source info: DUSP_52539
has source info: DUSP_52924
has obsolete equivalent: DUSP mn 1365
broader: Clift Hills 'Division'
has lower boundary definition: Drawn at base of meta-spilite of the Dunrossness Spilitic Formation where it rests conformably on pelitic wacke interpreted to belong to the Dunrossness Phyllitic (Formation).
has geographical distribution: Shetlands, Scotland.
has lithology description: Metamorphosed lavas and pyroclastic rocks. The spilites are intercalated with metasediments, mainly graphitic phyllites, quartzites and cherts.
has thickness description: Approximately 1000 metres.
has upper boundary definition: Drawn at unconformable upward passage from meta-spilite of the Dunrossness Spilitic Formation to the Old Red Sandstone.

Dunbeath Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DUTI
has current status: CURRENT
has theme: SPRFCL
notation: DB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41386
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41387
has lithology component: DUTI DMTN
has lithology component: DUTI S
has lithology component: DUTI V
has lithology component: DUTI Z
has source info: DUTI_51602
has source info: DUTI_52025
has obsolete equivalent: DUTI mn 1342
has lateral equivalent: DUTI st 767
broader: NWHG
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Caithness and Sutherland northeast of a line between Reay and Berridale (1:50 000 sheets 115E and W, 116E and W, 110).
has lithology description: Sandy, silty and commonly gritty, diamicton, typically pale to dark brown; clasts include Devonian mudstones, sandstones and flagstones, with some Caledonian igneous and Moine metamorphic rocks.
has thickness description: To 12m
has upper boundary definition: Base of the Reisgill Burn Till Formation, typically the base of the Forse Till member.

Dolgarrog Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41388
has lithology component: DV BA
has lithology component: DV TUF
has lithology component: DV VCBR
has source info: DV_52649
has obsolete equivalent: DV mn 3206
broader: SV
has lower boundary definition: Overlies Upper Crafnant Volcanic Formation. Characterized by ill-sorted pyroclastic deposits with much included argillaceous debris.
has geographical distribution: South and west of Dolgarrog.
has lithology description: Basalt, hyaloclastite, basaltic tuffs and pillow breccias.
has thickness description: 400m
has upper boundary definition: Underlies the Nod Glas (= Cadnant Shales).

Denham Valley Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: DVA
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: DVA GRAV
has lithology component: DVA SANDU
broader: NE

Daviot Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DVC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41389
has lithology component: DVC CONG
has lithology component: DVC LMST
has lithology component: DVC SDST
broader: INS
has lower boundary definition: Unconformable base on Pre-Cambrian rocks.
has geographical distribution: Not defined.
has lithology description: Red and purple cobble-boulder conglomerate with sporadic thin sandstone lenses and rare thin limestone lenses.
has thickness description: 200 metres +.
has upper boundary definition: Conformable upper contact with Nairnside Sandstone Formation.

Devoke Water Greisen
type: Concept
in scheme: NamedRockUnit
alternative label: DVK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Dovestone Redbeds Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DVR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DVR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41390
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41391
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41392
has lithology component: DVR CAMDST
has lithology component: DVR MDST
has lithology component: DVR SLST
has source info: DVR_49807
broader: Glenbuck Group
has lower boundary definition: Transition from underlying Douglas Water Arenite, taken where the proportion of red mudstones exceeds that of sandstone.
has geographical distribution: Lower Palaeozoic inlier of the Hagshaw Hills, Scotland, (50k Sheets 23E, 23W and 15W).
has lithology description: Red and greyish-red mudstones, siltstones and shales, weakly bedded with minor small-scale cross-bedding.
has thickness description: 72m
has upper boundary definition: Top of uppermost bed of reddish mudstone beneath the predominantly grey arenaceous beds of the overlying formation (which may be stained red).

Devil's Hole Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: DVSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KV
broader: VALH

Dergvone Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DVSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: NE
narrower: Gubaveeny Shale Member
narrower: LFM
narrower: KSM
narrower: Black Mountain Shale Member
narrower: TSM
has geographical distribution: Fermanagh and Leitrim

David's Stone Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DVSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
broader: NE

Dry Valley Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: DVY
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: DVY CLAY
has lithology component: DVY GRAV
has lithology component: DVY PEAT
has lithology component: DVY SANDU
has lithology component: DVY SICL
broader: NE
has lithology description: Normally soft to firm consolidated, compressible silty clay, but may contain layers of silt, sand, peat and a basal gravel. A stronger, desiccated surface zone may be present. Formed within some at-present dry or intermittently wet valleys. [Generic description: 'TMOS' Procedures].

War Damage (Undivided)
type: Concept
in scheme: NamedRockUnit
alternative label: DWA
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: TY
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: Disturbed Ground (Undivided)
narrower: Bomb Crater
narrower: Collapsed Building

Bomb Crater
type: Concept
in scheme: NamedRockUnit
alternative label: DWBC
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: UN
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: War Damage (Undivided)

Collapsed Building
type: Concept
in scheme: NamedRockUnit
alternative label: DWCB
has current status: CURRENT
has theme: ARTIF
has unit class: MADE
has revision number: 0
has rock unit rank: UN
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: XR
has predominant age: XR
has youngest age: XR
broader: War Damage (Undivided)

Dowsing Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DWDL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TD
has obsolete equivalent: DWDL mn 1311
broader: Haisborough Group
narrower: MKHA
narrower: ROHL

Dwyfach Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DWF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dwf
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41393
has lithology component: DWF MDST
has lithology component: DWF SDST
has lithology component: DWF SLST
has source info: DWF_50546
has source info: DWF_50909
broader: OGW
narrower: Bodwrog Member
narrower: PTN
has lower boundary definition: Underlain by rhyolitic ash-flow tuff of the Allt Fawr Rhyolitic Tuff Formation. Probably also unconformable on Nant Ffrancon Subgroup mudstones and siltstones, and Upper Lodge Formation lavas and tuffs.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: Medium- to coarse-grained sandstones and subordinate interbedded mudstones (Bodwrog Member), passing upwards into grey calcareous mudstones and siltstones with subordinate sandstones (Plastirion Member).
has thickness description: 150 to 600m
has upper boundary definition: Overlain by, and partly interbedded laterally with a sequence of lavas and tuffs with some volcaniclastic sediments of the Llanbedrog Volcanic Group.

Downwash Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: DWGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: DWGR GRAV
has lithology component: DWGR SANDU
broader: NE
has lithology description: Gravel and sand, from active slope processes. [Generic description].

Whiteness 'Division'
type: Concept
in scheme: NamedRockUnit
alternative label: DWH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: DWH CALSGN
has lithology component: DWH CALSIR
has lithology component: DWH GNGNS
has lithology component: DWH MLMST
has lithology component: DWH PELGN
has lithology component: DWH QZITE
has lithology component: DWH SEMPEL
has lithology component: DWH SPELGN
has lateral equivalent: DWH ARGY
broader: Dalradian Supergroup
narrower: LAXF
narrower: LCLL
narrower: Colla Firth Formation
narrower: WAD
narrower: Weisdale Limestone [Obsolete Code: Use Weil]
narrower: Whiteness Limestone [Obsolete Code: Use Wnsl]
narrower: Laxfirth Limestone [Obsolete Code: Use Laxf]
narrower: Girlsta Limestone Formation

Dowlais Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DWL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41394
has lithology component: DWL LMOOL
has lithology component: DWL LMST
has lithology component: DWL MDST
has lithology component: DWL SDST
has source info: DWL_49797
has source info: DWL_50474
has source info: DWL_52398
has obsolete equivalent: DWL mn 920
has obsolete equivalent: DWL mn 4467
broader: PEMB
narrower: GHL
has lower boundary definition: The base is placed at a regional unconformity, the basal limestone of the Dowlais Formation overstepping the underlying formations westwards on the north crop of the South Wales Coalfield, from the Llanelly Formation (green and red-mottled clay) in the east to the Avon Group (thinly bedded fissile mudstones and limestones) in the west.
has geographical distribution: North crop of the South Wales Coalfield, from Kidwelly [SN 415 077] to Gilwern Hill [SO 2450 1280].
has lithology description: Tabular, thick-bedded, mid- to dark grey, fetid, bituminous, fossiliferous, peloidal grainstone, packstone and wackestone limestones with dark grey shale interbeds; minor dark grey, micritic limestones and pale grey ooidal limestones and some local basal sandstones.
has thickness description: To about 120m
has upper boundary definition: The top is placed at the conformable junction of the dark grey limestones of the Dowlais Formation with the overlying pale grey ooidal limestones of the Penderyn Oolite Member of the Oxwich Head Limestone Formation. From the type area eastwards, the formation is truncated by a pre-Namurian unconformity.

Dalzell Works Lingula Band
type: Concept
in scheme: NamedRockUnit
alternative label: DWLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: MCMS

Dayia Beds
type: Concept
in scheme: NamedRockUnit
alternative label: DY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NE

Dalry Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DYBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DYBI COAL
has lithology component: DYBI FEST
broader: LSC

Dyrham Formation And Beacon Limestone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DYBN
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
broader: NP

Dykebar Coal
type: Concept
in scheme: NamedRockUnit
alternative label: DYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DYC COAL
broader: NE

Dalry Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: DYCI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: DYCI FESTC
broader: KLMD

Dandy Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: DYCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DYCO COAL
has lateral equivalent: DYCO st 132
has lateral equivalent: DYCO st 249
has obsolete equivalent: DYCO st 248
broader: PLCM

Dungy Drift Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: DYDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: DYDC COAL
has obsolete equivalent: DYDC mn 1352
broader: SWMCM

Dulcey Dock Member
type: Concept
in scheme: NamedRockUnit
alternative label: DYDK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Drumyork Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DYF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DYF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41396
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41397
has lithology component: DYF SDST
has source info: DYF_50121
has source info: DYF_52283
has source info: DYF_52760
broader: Dailly Subgroup
has lower boundary definition: Rests conformably on Lauchlan Formation.
has geographical distribution: Girvan area, south-west Scotland.
has lithology description: Grey-green sandstone, flaggy towards top.
has thickness description: 610m
has upper boundary definition: Conformably overlain by Blair Shale.

Dyehouse Coal (South Lanacashire)
type: Concept
in scheme: NamedRockUnit
alternative label: DYHC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DYHC COAL
broader: NE

Dyserth Limestone Group (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: DYLK
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DYLK LMST
broader: LGHL

Dykebar Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: DYLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41399
has lithology component: DYLS LMST
has source info: DYLS_52233
has obsolete equivalent: DYLS mn 3018
has lateral equivalent: DYLS FDSB
broader: LWM
has lower boundary definition: Generally seen as a change from marine mudstone (Dykebar and Balmore Marine bands) belonging to Lawmuir Formation overlying thin coal or seatrocks.
has geographical distribution: The Paisley and Glasgow area of the Midland Valley of Scotland.
has lithology description: A pale to dark grey, argillaceous, shelly, bioclastic limestone, interpreted to be of marine origin.
has thickness description: Up to 1.4 m thick in the Paisley and Glasgow districts, elsewhere represented by the Dykebar and Balmore Marine Bands.
has upper boundary definition: Generally a changes to a marine mudstone, the Dykebar and Balmore Marine bands Dykebar and Balmore Marine bands, belonging to the Lawmuir Formation, and overlain by non-marine sandy strata

Dysart Main Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: DYMA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: DYMA COAL
broader: LCMS

Dysart Musselband
type: Concept
in scheme: NamedRockUnit
alternative label: DYMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Dykebar Marls
type: Concept
in scheme: NamedRockUnit
alternative label: DYMR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DYMR CAMDST
broader: LWM

Dol-Cyn-Afon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DYN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Dyn
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41400
has lithology component: DYN MDST
has lithology component: DYN SDST
has lithology component: DYN SLST
has lithology component: DYN VCSST
has source info: DYN_49435
has source info: DYN_50546
has source info: DYN_51180
has source info: DYN_52536
has obsolete equivalent: DYN mn 50
has obsolete equivalent: DYN mn 1189
has obsolete equivalent: DYN mn 1738
has obsolete equivalent: DYN TCB
has obsolete equivalent: DYN mn 4252
has obsolete equivalent: DYN mn 1275
has obsolete equivalent: DYN mn 3368
broader: MWG
narrower: TAH
has lower boundary definition: Conformable on black mudstones of the Dolgellau Formation.
has geographical distribution: Northern, eastern and southern flanks of the Harlech Dome, Cwm Pennant, Snowdonia.
has lithology description: Grey mudstone and silty mudstone and siltstone with bioturbated sandstones locally.
has supplementary information: Uppermost division of the Mawddach Group. Includes informal sandstone members in southern Snowdonia. Upgraded from Dol-cyn-afon Member of Allen and Jackson, 1985 (Howells and Smith, 1997; Pratt, Woodhall and Howells, 1995). Preferred name for the formations of Tremadoc age, including the Afon Gam and Glanypwll formations and the "Tremadoc Slates".
has thickness description: 340 to 400m, locally thickening to 900m
has upper boundary definition: Unconformably overlain by sandstones or conglomerates of the Allt Lwyd Formation (Nant Ffrancon Subgroup), and locally to the southeast of the Harlech Dome by rocks of the Rhobell Volcanic Group.

Dirty Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: DYRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: DYRC COAL
broader: Brithdir Member

Dyrham Formation
type: Concept
in scheme: NamedRockUnit
alternative label: DYS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: DyS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41402
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41403
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41404
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41405
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41401
has lithology component: DYS FEOOL
has lithology component: DYS LMST
has lithology component: DYS MDST
has lithology component: DYS SAMDST
has lithology component: DYS SANDU
has lithology component: DYS SDST
has lithology component: DYS SLMDST
has lithology component: DYS SLST
has source info: DYS_49320
has source info: DYS_49471
has source info: DYS_49473
has source info: DYS_50455
has source info: DYS_50680
has source info: DYS_50765
has source info: DYS_51107
has source info: DYS_51418
has source info: DYS_51615
has source info: DYS_51765
has source info: DYS_52881
has obsolete equivalent: DYS mn 1383
has obsolete equivalent: DYS mn 1789
has obsolete equivalent: DYS mn 2860
has obsolete equivalent: DYS mn 2864
has obsolete equivalent: DYS mn 2865
has obsolete equivalent: DYS mn 1382
has obsolete equivalent: DYS mn 2859
has obsolete equivalent: DYS mn 2863
broader: LI
narrower: TCSA
narrower: Eype Clay Member
narrower: Down Cliff Sand Member
narrower: Down Cliff Sand Member And Thorncombe Sand Member (Undifferentiated)
has lower boundary definition: Marked or gradational downward change from silty mudstones to smoother argillaceous sediments of the Charmouth Mudstone Formation; commonly coincides with negative change of slope and/or line of seepage that may correspond with a sandy bed (e.g. Capricornus Sandstone in the Cotswolds; Sumbler, M G, Barron, A J M and Morigi, A N, 2000). On Dorset coast, at base of Three Tiers Sandstone (Hesselbo, S P and Jenkyns, H C, 1995) (base of Bed 6 of Howarth, M K, 1957).
has geographical distribution: Wessex Basin, Worcester Basin and East Midlands Shelf (Dorset coast to c.Grantham, Lincs).
has lithology description: Pale to dark grey and greenish grey, silty and sandy mudstone, with interbeds of silt or very fine-grained sand (locally muddy or silty), weathering yellow. Variably micaceous. Impersistent beds or doggers of ferruginous limestone (some ooidal) and sandstone, which tend to occur at the top of sedimentary cycles. Sporadic large cementstone nodules.
has thickness description: To c.125m
has upper boundary definition: At base of ferruginous limestone or ironstone of the Marlstone Rock Formation or Marlstone Member of the Beacon Limestone Formation.

Durley Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: DYSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Du
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41406
has lithology component: DYSA SANDU
has source info: DYSA_49854
has source info: DYSA_50056
has source info: DYSA_51620
has obsolete equivalent: DYSA WHI
broader: LC
has lower boundary definition: Appearance of sandy clay and sandy silt in coarsening-upwards sequence of Division D (1) of London Clay of King (1981).
has geographical distribution: Known only in the Durley area of Hampshire, north-east of Southampton. As mapped confined to 1: 10 000 Sheet SU51NW. Passes laterally into Whitecliff Member or wedged out.
has lithology description: Buff, clayey, fine-grained sand.
has thickness description: Up to 8m. Lenticular.
has upper boundary definition: Erosional surface at base of Wittering Formation (laminated clays or sands).

Dalmahoy Shale
type: Concept
in scheme: NamedRockUnit
alternative label: DYSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: DYSH FEST
has lithology component: DYSH MDST
has lithology component: DYSH SAPEL
has lateral equivalent: DYSH st 245
broader: Calders Member
has geographical distribution: Eastern part of the Midland Valley; Midlothian - particularly the area around Dalmahoy.
has lithology description: Soft bluish shaly mudstones, locally relatively oil-rich (sapropelite), with nodular and tabular ironstones.

Dyrham Formation And Marlstone Rock Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: DYSM
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JT
has lithology component: DYSM CALSST
has lithology component: DYSM FEOOL
has lithology component: DYSM FEST
has lithology component: DYSM LMOOL
has lithology component: DYSM LMST
has lithology component: DYSM MDST
has lithology component: DYSM SAMDST
has lithology component: DYSM SANDU
has lithology component: DYSM SDST
has lithology component: DYSM SLMDST
broader: LI

Cravenoceras Leion Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E1A1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: E1A1 MDST
broader: MG

Cravenoceras Brandoni Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E1B1
has current status: CURRENT
has theme: BEDRCK
notation: E1b1
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: Bowland Shale Formation

Tumulites Pseudobilinguis Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E1B2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has obsolete equivalent: E1B2 mn 1490
broader: MG

Cravenoceras Malhamense Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E1C1
has current status: CURRENT
has theme: BEDRCK
notation: E1c1
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: E1C1 MDST
broader: Bowland Shale Formation

Cravenoceras Cowlingense Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2A1
has current status: CURRENT
has theme: BEDRCK
notation: E2a1
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2A1 MDST
has lateral equivalent: E2A1 WWMB
broader: SILS
broader: SMGP

Eumorphoceras Ferrimontanum Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2A2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2A2 MDST
has obsolete equivalent: E2A2 mn 1489
broader: SILS

Cravenoceras Gressinghamense Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2A2A
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2A2A MDST
broader: SILS

Eumorphoceras Yatesae Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2A3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2A3 MDST
broader: SILS

Cravenoceratoides Edalensis Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2B1
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: SILS

Cravenoceratoides Nitidus Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2B2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2B2 MDST
broader: SILS

Cravenoceratoides Nititoides Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2B3
has current status: CURRENT
has theme: BEDRCK
notation: E2b3
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2B3 MDST
broader: SILS

Nuculoceras Stellarum Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: E2C1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2C1 MDST
broader: MARR
broader: SILS

Nuculoceras Nuculum Marine Band [1 Of 3]
type: Concept
in scheme: NamedRockUnit
alternative label: E2C2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: E2C2 MDST
broader: SILS

Nuculoceras Nuculum Marine Band [2 Of 3]
type: Concept
in scheme: NamedRockUnit
alternative label: E2C3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: Craven Group
broader: SILS

Nuculoceras Nuculum Marine Band [3 Of 3]
type: Concept
in scheme: NamedRockUnit
alternative label: E2C4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: Craven Group
broader: SILS

Earnley Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ea
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41408
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41407
has lithology component: EA SANDU
has lithology component: EA SILT
has source info: EA_49217
has obsolete equivalent: EA mn 1393
has obsolete equivalent: EA mn 1394
broader: Bracklesham Group
has lower boundary definition: Rests on Wittering Formation. Base of formation marked by the transgressive surface overlain by glauconitic silty sands and pebble bed.
has geographical distribution: Eastern Hampshire Basin.
has lithology description: Glauconitic silty sands and sandy silts.
has thickness description: 22-25m
has upper boundary definition: Overlain by the Marsh Farm Formation. Boundary marked by the upward change from the glauconitic sands of the Earnley Sand Formation to the thin-bedded clays and silts with glauconitic sand laminae of the Marsh Farm Formation.

Eagle Crag Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EAGC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Eag
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41409
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41410
has lithology component: EAGC CONG
has lithology component: EAGC SLST
has lithology component: EAGC TUF
has lithology component: EAGC VCBR
has lithology component: EAGC VCSST
has lithology component: EAGC VLSS
has source info: EAGC_50739
has source info: EAGC_53059
has obsolete equivalent: EAGC mn 1386
has obsolete equivalent: EAGC mn 1387
broader: Birker Fell Andesite Formation
has lower boundary definition: Taken at the base of the lowest bedded volcaniclastic rock within the sequence of volcaniclastic sedimentary rocks and associated andesite sills, resting on andesite or, locally, dacite within the Birker Fell Andesite Formation.
has geographical distribution: From Haycock, southwest of Buttermere to the area east of Derwent Water, Cumbria
has lithology description: Volcaniclastic siltstone, sandstone, conglomerate and breccia in a bedded succession; intercalated subordinate units of tuff, eutaxitic lapilli-tuff and accretionary lapilli-tuff. Intruded by many peperitic andesite sills.
has thickness description: Up to 270m
has upper boundary definition: Defined by the base of overlying andesite sheets of the Birker Fell Andesite Formation.

Earnley Sand Formation And Marsh Farm Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: EAMF
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
has lithology component: EAMF CLAY
has lithology component: EAMF SANDU
has lithology component: EAMF SILT
broader: Bracklesham Group

Eagle Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: EASA
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: EASA SDST
broader: NE

Easington Raised Beach Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EASN
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41411
has lithology component: EASN S
has lithology component: EASN SDSH
has lithology component: EASN V
has source info: EASN_49140
has source info: EASN_49811
has source info: EASN_50276
has source info: EASN_50508
has source info: EASN_50596
has obsolete equivalent: EASN mn 1396
broader: British Coastal Deposits Group
has lower boundary definition: The beach gravel rests on a bevelled, subhorizontal platform, bored by marine molluscs, cut into limestones and dolostones of the Zechstein Group (formerly Magnesian Limestone) at about 30m above sea level.
has geographical distribution: Coast of County Durham.
has lithology description: Partly cemented, well sorted gravel and sand containing marine shells. The gravel is composed predominantly of limestone and dolostone of the Zechstein Group (formerly Magnesian Limestone) towards the base, with an increasing content upwards of Carboniferous rock types. Cheviot andesite, Borrowdale Volcanic Group rock types and dolerite. Also including sparse halleflinta, rhomb-porphyry and garnet-hornblende schist of supposed Scandinavian affinity. Twelve temperate genera of marine mollusc have been identified from the deposit, and borings by marine molluscs and annelid worms in the rock platform as well as in cobbles confirm that the deposit is in situ.
has thickness description: 4m
has upper boundary definition: Thought to be a planar horizontal or undulating unconformable contact with dark grey diamicton of the Blackhall Till Formation, but contact is obscured and inaccessible.

Eastern Granite (Northmaven Pluton)
type: Concept
in scheme: NamedRockUnit
alternative label: EAST
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DU
has lithology component: EAST GN
has lithology component: EAST GNGP
broader: NMVN

East Barra Meta-Igneous Complex
type: Concept
in scheme: NamedRockUnit
alternative label: EBAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AL
has predominant age: AL
has youngest age: AL
has lithology component: EBAR MDI
has lithology component: EBAR MGB
broader: NA

Eller Beck Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EBB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41412
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41413
has lithology component: EBB CASLST
has lithology component: EBB FEOOL
has lithology component: EBB FGSST
has lithology component: EBB LMMC
has lithology component: EBB MDST
has lithology component: EBB SDST
has source info: EBB_48893
has source info: EBB_49206
has source info: EBB_49456
has source info: EBB_49458
has source info: EBB_50031
has source info: EBB_50728
has source info: EBB_50863
has source info: EBB_51203
has source info: EBB_51467
has source info: EBB_51539
has source info: EBB_51696
has source info: EBB_51768
has source info: EBB_52066
has obsolete equivalent: EBB mn 499
has obsolete equivalent: EBB mn 1442
has obsolete equivalent: EBB mn 2065
broader: RAG
has lower boundary definition: The lower boundary is conformable, at the abrupt upward transition from the plant debris-rich, cross-stratified sandstones, siltstones and mudstones of the Saltwick Formation to the fossiliferous, ooidal ironstone or ferruginous sandstone at the base of the Eller Beck Formation.
has geographical distribution: The Cleveland Hills, North York Moors, Hambleton and Howardian Hills in north-east England (Fox-Strangways, 1892; Hemingway and Knox, 1973; Hemingway, 1974). It has not been identified offshore in the Southern North Sea, but probably forms part of the Wroot Formation (Lott and Knox, 1994).
has landform description: The formation forms a bench on the sea cliffs of the Yorkshire coast between Peak Scar, Ravenscar [NZ 980 022] to just south of Hayburn Wyke [TA 017 964] and between Whitby, East Cliff [NZ 902 114] and Hawsker Bottoms [NZ 940 084]. Inland in the Cleveland, Hambleton and Howardian Hills, it generally forms a small, positive topographical feature where a distinctive sandstone bed is present (Barrow, 1877; Knox, 1973); the feature is less prominent in the Hambleton and Howardian Hills where the lithofacies change to mudstone, thin limestone and ironstone (Powell and Rathbone, 1992).
has lithogenesis description: Shallow-marine transgressive unit representing the first major marine transgression across the Mid-Jurassic fluvio-deltaic hinterland.
has lithology description: In the Cleveland Hills and on the North Yorkshire Coast the formation typically comprises marine ironstone, sandstone and mudstone. Two main lithological units are present; the lower unit, generally less than 3m thick, consists of grey mudstone with subordinate sideritic ironstone, with a bed of ooidal ironstone at the base. The upper unit, typically 4-6m thick, consists predominantly of fine- to medium-grained sandstone, commonly ripple laminated. Southwards, the formation passes into a more calcareous and finer-grained unit dominated by mudstones, argillaceous limestones and ferruginous sandstones (the "Blowgill Member" of Hemingway and Knox, 1973). Fossil marine bivalves and bioturbation are common, especially in the mudstones and ironstones. Diplocraterion burrows are commonly present in the sandstones.
has thickness description: Typically 4.5 to 6m, up to a maximum of 8.2m in the type section at Walk Mill Foss, Eller Beck, Goathland [NZ 833 023] (Barrow, 1877; Hemingway and Knox, 1973). Thins south-eastwards in the Hambleton Hills to c.4m thick.
has upper boundary definition: The upper boundary is conformable, or disconformable, at the abrupt upward transition from the fossiliferous mudstone and ripple laminated sandstones of the upper part of the Eller Beck Formation to the cross-stratified, plant debris-rich sandstones, siltstones and mudstones of the Cloughton Formation (Sycarham Member).

Easton Bavents Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: EBC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QV
has predominant age: QV
has youngest age: QV
has lithology component: EBC CLAY
has lithology component: EBC SANDU
has lithology component: EBC SILT
broader: NCG
has lithology description: Clay, pale to mid grey, with thin beds of silt or fine-grained sand. [Generic description: academic papers and BGS Memoirs].

Easebourne Member
type: Concept
in scheme: NamedRockUnit
alternative label: EBO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Eb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41414
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41415
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41416
has lithology component: EBO CLAY
has lithology component: EBO SANDU
has source info: EBO_49405
has source info: EBO_49407
has source info: EBO_49408
has source info: EBO_49984
has source info: EBO_51157
has source info: EBO_51193
has source info: EBO_51318
has source info: EBO_51325
has source info: EBO_52062
broader: SAB
has lower boundary definition: Sharply defined contact on similar but less well cemented sands of Hythe Formation.
has geographical distribution: Between Chithurst (Gatehouse) SU8323 and Petworth SU9820, south-western Weald (Sussex).
has lithology description: Fine- to medium-grained glauconitic sands, some very well cemented (calcareous), with minor clay interbeds.
has thickness description: 0-40m
has upper boundary definition: Incoming of conspicuous clay-rich sands and clays at base of Fittleworth Member.

Exe Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EBR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41417
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41418
has lithology component: EBR BREC
has lithology component: EBR SDST
has source info: EBR_52415
has source info: EBR_52555
has obsolete equivalent: EBR mn 1492
broader: Exeter Group
has lower boundary definition: Overlies and interdigitates with the Dawlish Sandstone Formation, which is essentially a red sandstone in planar- or cross-bedded units with sparse pebble seams.
has geographical distribution: Newton Abbot District, Devon.
has lithology description: A red breccia containing clasts from 30 - 100mm in diameter, in a silty sandy matrix, with cross-bedded and planar-bedded sandstone sets up to 3m thick. Breccia clasts include sandstone, slate and quartz porphry.
has thickness description: 85m
has upper boundary definition: Disconformable with the overlying Exmouth Mudstone and Sandstone Formation, which comprises predominantly thick units of red-brown mudstone with sporadic sandstone beds.

Eyebroughty Sill
type: Concept
in scheme: NamedRockUnit
alternative label: EBRTY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: EBRTY TR
broader: MVFEL

Ebchester Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EBSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41419
has lithology component: EBSG S
has lithology component: EBSG V
has lithology component: EBSG Z
has source info: EBSG_52342
has lateral equivalent: EBSG st 281
has obsolete equivalent: EBSG GSG
broader: NPEG
has lower boundary definition: Erosional unconformable contact with stiff, dark greyish brown, stony, sandy silty clay diamicton of the Wear Till Formation.
has geographical distribution: Northern Pennines.
has lithology description: Sand and gravel containing clasts of Carboniferous lithologies (sandstone, gritty sandstone, limestone, mudstone, gannister, coal), including far-travelled clasts from Scotland and the Lake District (greywacke sandstone and siltstone, granite and granodiorite).
has thickness description: To 10m
has upper boundary definition: Generally the land surface, or erosional unconformable contact with sand and gravel forming more recent river terraces.

East Brow Member
type: Concept
in scheme: NamedRockUnit
alternative label: EBW
has current status: CURRENT
has theme: BEDRCK
notation: EBW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41420
has lithology component: EBW MDST
has lithology component: EBW SDST
has source info: EBW_49247
broader: Auldthorns Formation
has lower boundary definition: Succeeds coarse green sandstone and conglomerate of the Escarpment Member of the Auldthorns Formation. Distinguished from the Escarpment Member by having almost no conglomerate and a large number of mudstone units.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: A sequence of greyish-green fine- to medium-grained sandstones and mudstones on the east brow of Quarrel Hill.
has thickness description: c.30m (estimate).
has upper boundary definition: Succeeded by green and purple mudstone of the Quarrel Hill Formation.

East Carlton Grit
type: Concept
in scheme: NamedRockUnit
alternative label: EC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: EC MDST
has lithology component: EC SDST
has lateral equivalent: EC SF
broader: MARSD
has geographical distribution: West Yorkshire [East Carlton, northwest of Leeds].

Eccliffe Member
type: Concept
in scheme: NamedRockUnit
alternative label: ECC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ecf
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41421
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41422
has lithology component: ECC LMOOL
has source info: ECC_52116
broader: Clavellata Formation
has lower boundary definition: Upward change from bioclastic oolites and micrites to even-grained oolite.
has geographical distribution: From the A30 on the northern edge of the Shaftesbury Sheet (313), northwards across the southern half of the Wincanton Sheet (297).
has lithology description: Fine- to medium-grained, flaggy oolite.
has thickness description: 0 - 5m
has upper boundary definition: Top marked by a change from fine-to medium- grained flaggy oolite to sandy and ooidal mudstone (Sandsfoot Clay Member, where present), or non-sequence overlain by fine-grained sand or sandy clay, locally with phosphatic nodules at the base (Sandsfoot Grit Member, Sandsfoot Formation).

Eggardon Grit
type: Concept
in scheme: NamedRockUnit
alternative label: ECG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has lithology component: ECG CALSST
has lithology component: ECG SDST
broader: NE

Eggardon Chert Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ECHB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has lithology component: ECHB CHRT
has lateral equivalent: ECHB st 125
has lateral equivalent: ECHB ECG
has lateral equivalent: ECHB st 182
broader: UGS

Ecton Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ECL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 3
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41423
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41424
has lithology component: ECL CHRT
has lithology component: ECL LMST
has lithology component: ECL MDST
has source info: ECL_49236
has source info: ECL_50614
has source info: ECL_52729
has obsolete equivalent: ECL mn 1406
has obsolete equivalent: ECL mn 2908
has obsolete equivalent: ECL mn 96
broader: PKLM
narrower: Ecton Limestones Formation (Knoll-Reef)
has lower boundary definition: The base of thicker-bedded, paler grey peloidal and crinoidal bioclastic limestone above dark grey, thinly-bedded, fine-grained limestones of the Milldale Limestone Formation.
has geographical distribution: The Dovedale-Manifold Valley, and the southwestern part of the Peak District inlier [SK 09 60] to [SK 13 48], Derbyshire and Staffordshire.
has lithology description: The lower part of the formation is dominated by thinly to thickly bedded, brownish-grey, finely bioclastic and peloidal to conglomeratic limestone, containing chert nodules and mudstone partings, in sharp based, poorly graded turbiditic beds. In the middle, thinly bedded and laminated dark grey micritic limestone passes up into thicker bedded limestone. The upper part of the formation, includes dark grey fine-grained limestone, and coarser-grained, sharp-based graded beds of turbiditic origin.
has thickness description: From 225m in the type area, increasing to a maximum of 258m proved around Grindon [SK 093 541].
has upper boundary definition: A transitional conformable base taken at the lowest thick grey mudstone of the Widmerpool Formation, above grey limestones of the Ecton Limestone Formation.

Ecton Limestones Formation (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: ECLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
broader: Ecton Limestone Formation

Eccup Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: ECMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
broader: NE

Escarpment Member
type: Concept
in scheme: NamedRockUnit
alternative label: ECP
has current status: CURRENT
has theme: BEDRCK
notation: ECP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41425
has lithology component: ECP CONG
has lithology component: ECP SDST
has source info: ECP_49247
broader: NE
has lower boundary definition: Succeeds alternating flaggy sandstones and shales of the Shalloch Formation.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Coarse green sandstone and conglomerate (lower 2m conglomerate, upper 4m sandstone).
has thickness description: 6m
has upper boundary definition: Succeeded by sandstones and mudstones of the East Brow Member of the Auldthorns Formation.

Ecton Member
type: Concept
in scheme: NamedRockUnit
alternative label: ECTN
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41426
has lithology component: ECTN P
has lithology component: ECTN S
has lithology component: ECTN V
has source info: ECTN_49739
has source info: ECTN_50797
has source info: ECTN_50918
has obsolete equivalent: ECTN mn 1590
broader: NENE
has lower boundary definition: Unconformable, commonly chanelled base, resting on bedrock surface.
has geographical distribution: Nene Valley, Central England.
has lithology description: Gravel with sand, clay and, locally, peat.
has thickness description: 0 to 4.5m
has upper boundary definition: At ground surface or at base of overlying alluvium.

Edderton Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: ED
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
broader: NE

Edmondia Coal (Nottingham)
type: Concept
in scheme: NamedRockUnit
alternative label: EDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: EDC COAL
broader: NE

Edinburgh Castle Plug
type: Concept
in scheme: NamedRockUnit
alternative label: EDCP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: PG
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: EDCP DOLR
broader: SSDPV

Eday Flagstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EDF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EdF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: EDF MDST
has lithology component: EDF SDST
has lithology component: EDF SLST
has obsolete equivalent: EDF mn 1410
broader: Eday Group
narrower: Deerness Volcanic Member

Eldroth Grit
type: Concept
in scheme: NamedRockUnit
alternative label: EDG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EdG
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41427
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41429
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41428
has lithology component: EDG LMST
has lithology component: EDG MDST
has lithology component: EDG SDST
has source info: EDG_48721
has source info: EDG_51288
has source info: EDG_52000
has obsolete equivalent: EDG mn 1438
broader: Hebden Formation
has lower boundary definition: Base taken where the predominantly sandstone sequence of the Eldroth Grit overlies siltstones of the Kirkbeck Member.
has geographical distribution: Craven Basin, northwest England.
has lithology description: Trough cross-bedded feldspathic, medium- to coarse-grained sandstone, typically thickly bedded. Ganister palaeosols are present in the upper part of the unit.
has thickness description: 30m (Bentham area); 50-60m (Settle district).
has upper boundary definition: Taken at the top of the highest sandstone of the Eldroth Grit, commonly containing rootlets, overlain by mudstone or siltstone of the Millstone Grit Group (undifferentiated).

Eday Marl Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EDMA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EdM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: EDMA AROC
has lithology component: EDMA SDST
has lithology component: EDMA SLST
has obsolete equivalent: EDMA mn 1412
broader: Eday Group

Edge Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: EDMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
broader: MG

Ederny Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EDNY
has current status: CURRENT
has theme: BEDRCK
notation: EDNY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41430
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41431
has lithology component: EDNY LMST
has lithology component: EDNY MDST
has lithology component: EDNY SLMDST
has source info: EDNY_49803
broader: Ballyshannon Limestone Formation
has lower boundary definition: Either gradational, with normal limestones of the formation (ie downward decrease in micritisation) or abrupt, with base marked by 0.06 - 0.2m layer of grey shales and noduler limestones; also rests on Drumowen Sandstone and Crockanaver Limestone members.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Limestone, pale grey, micritised, sparsely bioclastic crinoidal packstone with wisps and disrupted layers of yellow silty shale.
has thickness description: 2.5 - 5.5m
has upper boundary definition: Pitted top of the member overlain by up to 0.18 metres of multi coloured clays representing disconformable base of succeeding Bundoran Shale Formation.

Earl David's Parrot Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: EDP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EDP COAL
broader: LCMS

Elidir Group
type: Concept
in scheme: NamedRockUnit
alternative label: EDR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
broader: NE

Eden Shales Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EDSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EDSH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41434
has lithology component: EDSH ANHY
has lithology component: EDSH DOLO
has lithology component: EDSH GYPST
has lithology component: EDSH LMST
has lithology component: EDSH MDST
has source info: EDSH_49996
has source info: EDSH_52774
has obsolete equivalent: EDSH mn 3959
broader: Cumbrian Coast Group
narrower: A-Bed Evaporite
narrower: Belah Dolomite
narrower: C-Bed Evaporite
narrower: HPB
narrower: B-Bed Evaporite
narrower: LWBB
narrower: D-Bed Evaporite
has lower boundary definition: Conformable base on Penrith Sandstone Formation.
has lithology description: Red shales and mudstones with local beds of gypsum and anhydrite, rare dolomitic limestones.
has thickness description: Up to c.100m
has upper boundary definition: Conformable upward passage to St Bees Sandstone Formation.

Edlington Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EDT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EDF
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41435
has lithology component: EDT ANHY
has lithology component: EDT CAMDST
has lithology component: EDT DOLMST
has lithology component: EDT GYPST
has lithology component: EDT MDST
has lithology component: EDT SDST
has lithology component: EDT SLST
has source info: EDT_51513
has obsolete equivalent: EDT mn 2878
has obsolete equivalent: EDT mn 3295
broader: ZG
has lower boundary definition: Sharp, upward passage from dolostone of Cadeby Formation.
has geographical distribution: East Midlands and NE England. Dies out south of Nottingham. Passes eastwards into thick dolostones and evaporites.
has lithology description: Mudstone, red-brown, with subordinate siltstone and sandstone, greenish-grey sandstone more common in Nottinghamshire. Dolostone and gypsum/anhydrite locally common.
has thickness description: 0-65m
has upper boundary definition: Upward passage into dolomitic limestone of Brotherton Formation.

Edenside Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EDTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Central Cumbria Glacigenic Subgroup

Edwalton Member
type: Concept
in scheme: NamedRockUnit
alternative label: EDW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Edw
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TC
has predominant age: TC
has youngest age: TC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41437
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41438
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41436
has lithology component: EDW DSDST
has lithology component: EDW GYPST
has lithology component: EDW MDST
has lithology component: EDW SLST
has source info: EDW_48671
has source info: EDW_48797
has source info: EDW_48817
has source info: EDW_50409
has source info: EDW_51674
has source info: EDW_52146
has obsolete equivalent: EDW mn 1418
broader: SIM
has lower boundary definition: Conformable, at the abrupt or rapid upward transition from interbedded green mudstone and pale grey fine-grained sandstone of the Cotgrave Sandstone Member to reddish brown structureless mudstone at the base of the Edwalton Member.
has geographical distribution: Mapped at the surface in south Nottinghamshire and Leicestershire; recognisable in borehole core and geophysical logs in the subsurface throughout East Midlands and northeast England.
has lithology description: Mudstone and siltstone, red-brown and greenish grey, with beds of indurated, variably dolomitic siltstone and very fine-grained sandstone common in the lower half; finely disseminated gypsum common in upper half.
has supplementary information: Originally defined as a Formation, the unit is retained as a local member within the nationally recognized Sidmouth Mudstone Formation.
has thickness description: 35 to 45m
has upper boundary definition: Conformable, at the abrupt upward transition from structureless, reddish brown and greenish grey mottled, gypsiferous mudstone at the top of the Edwalton Member to the lowest fine to medium-grained sandstone bed of the Arden Sandstone Formation.

Eday Group
type: Concept
in scheme: NamedRockUnit
alternative label: EDY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Edy
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41439
has lithology component: EDY SDST
has lithology component: EDY VLSS
has source info: EDY_52174
has source info: EDY_52180
has source info: EDY_52750
has source info: EDY_53058
has obsolete equivalent: EDY mn 1409
has obsolete equivalent: EDY mn 1413
has obsolete equivalent: EDY mn 3157
has obsolete equivalent: EDY mn 2042
is obsolete equivalent of: EDY OYS
broader: ORS
narrower: Eday Flagstone Formation
narrower: Eday Marl Formation
narrower: LED
narrower: Dunnet Head Sandstone Formation
narrower: MED
narrower: HOY
narrower: JOG
narrower: UED
narrower: STQS
has lower boundary definition: Drawn at the base of the Lower Eday Sandstone Formation where it rests conformably upon the Rousay Member of the Upper Stromness Flagstone Formation.
has geographical distribution: Orkney Islands
has lithology description: Comprises yellow sandstones with thin fossiliferous flags below and red and unfossiliferous above. Containing one volcanic horizon.
has thickness description: c.1300m
has upper boundary definition: Not overlain: highest Group in the Orkney Islands.

Eem Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EE
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: EE CLAY
has lithology component: EE SANDU
has source info: EE_50433
has source info: EE_50533
has obsolete equivalent: EE mn 1423
broader: NE
has lower boundary definition: At type locality overlies Saalian glacial till. In Flemish Bight, overlies Lower and Middle Pleistocene formations (unconformably).
has geographical distribution: Not defined.
has lithology description: Fine- to medium-grained shelly marine sands/intertidal or shallow sub-tidal in north west Flemish Bight with interbeds of clay.
has thickness description: 15.71 metres. Lateral variations 5 - 30 metres. Maximum 30 metres in Flemish Bight Sheet.
has upper boundary definition: At type locality, overlain by Weichselian periglacial sands (Twente Formation). In Flemish Bight, is overlain by Twente Formation, Brown Bank Formation (early Weichselian brackish-marine clays) or Halocene sands.

Eemian Mud And Sand, Interbedded (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EEMAS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: BI
has youngest age: BI
has lithology component: EEMAS GV
has lithology component: EEMAS S
has lithology component: EEMAS SND
has lithology component: EEMAS V
broader: NA

Esk Evaporite Member
type: Concept
in scheme: NamedRockUnit
alternative label: EEV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TO
has predominant age: TO
has youngest age: TO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41440
has lithology component: EEV BREC
has lithology component: EEV HALI
has lithology component: EEV MDST
has source info: EEV_48671
has source info: EEV_49159
has source info: EEV_50086
has source info: EEV_50520
has source info: EEV_50627
has obsolete equivalent: EEV mn 2191
has lateral equivalent: EEV ROHL
has obsolete equivalent: EEV mn 1471
broader: SIM
has lower boundary definition: Conformable, at gradational upward transition from red-brown mudstone to mudstone with halite at the base of the Esk Evaporite Member.
has geographical distribution: Cleveland, northeast England. Proved only in the subsurface, not mapped at outcrop.
has lithology description: Mudstone, red-brown, with halite beds and veins, and common mudstone breccias formed from halite dissolution.
has thickness description: 7m at the type section, ranges up to 50m.
has upper boundary definition: Conformable, at gradational transition from mudstone with halite of the Esk Evaporite Member to red-brown mudstone of the undifferentiated Sidmouth Mudstone Formation.

Eskmouth Extra Coal
type: Concept
in scheme: NamedRockUnit
alternative label: EEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CA
has lithology component: EEX COAL
broader: PGP
has additional age information: Within the range ?Yeadonian to Langsettian. Yeadonian might be appropriate rather than Namurian, but there is no real evidence. It is likely that the seam is no older than this. Note the Lethem Well Coal in Fife is described in similar loose fashion and is at about the same position in the Passage Formation. On balance it is likely that both coals are Langsettian, but the key 6 Group Marine bands are difficult to identify as such in Fife and the Lothians.

Elland Flags
type: Concept
in scheme: NamedRockUnit
alternative label: EF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF BMDST
has lithology component: EF COAL
has lithology component: EF MDST
has lithology component: EF SDST
broader: PLCM
narrower: Elland Flagstones Leaf 1
narrower: Elland Flagstones Leaf 2
narrower: Elland Flagstones Leaf 3
narrower: Elland Flagstones Leaf 4
narrower: Elland Flagstones Leaf 5
narrower: Elland Flagstones Leaf 6
narrower: Elland Flagstones Leaf 7
narrower: Elland Flagstones Leaf 8
narrower: Elland Flagstones Leaf 9
has lithology description: The Elland Flags consist of fine- to medium-grained flaggy to thickly bedded micaceous sandstone. The unit occurs as a number of sandstone leaves that are interbedded with dark micaceous and carbonaceous mudstone, locally containing thin dirty coals.

Elland Flagstones Leaf 1
type: Concept
in scheme: NamedRockUnit
alternative label: EF1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF1 SDST
broader: Elland Flags

Elland Flagstones Leaf 2
type: Concept
in scheme: NamedRockUnit
alternative label: EF2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF2 SDST
broader: Elland Flags

Elland Flagstones Leaf 3
type: Concept
in scheme: NamedRockUnit
alternative label: EF3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF3 SDST
broader: Elland Flags

Elland Flagstones Leaf 4
type: Concept
in scheme: NamedRockUnit
alternative label: EF4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF4 SDST
broader: Elland Flags

Elland Flagstones Leaf 5
type: Concept
in scheme: NamedRockUnit
alternative label: EF5
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF5 SDST
broader: Elland Flags

Elland Flagstones Leaf 6
type: Concept
in scheme: NamedRockUnit
alternative label: EF6
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF6 SDST
broader: Elland Flags

Elland Flagstones Leaf 7
type: Concept
in scheme: NamedRockUnit
alternative label: EF7
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF7 SDST
broader: Elland Flags

Elland Flagstones Leaf 8
type: Concept
in scheme: NamedRockUnit
alternative label: EF8
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF8 SDST
broader: Elland Flags

Elland Flagstones Leaf 9
type: Concept
in scheme: NamedRockUnit
alternative label: EF9
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EF9 SDST
broader: Elland Flags

Eathie Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: EFB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
broader: NE

East Fife Basanitic And Foiditic Plugs And Vents
type: Concept
in scheme: NamedRockUnit
alternative label: EFBFP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: EFBFP NBSN
broader: SCPPV

Eight Feet Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: EFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: EFC COAL
has lateral equivalent: EFC st 926
broader: PMCM

Easton Four Feet Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: EFFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EFFC COAL
broader: SWLCM

Egmond Ground Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: EG CLAY
has lithology component: EG SANDU
has source info: EG_48688
broader: NE
has lower boundary definition: Overlies Early or Middle Pleistocene sediments.
has geographical distribution: Not defined.
has lithology description: Fine-grained, sparsely shelly marine sands with clay interbeds (markedly less shelly than younger sands of the Eem Formation).
has thickness description: 0 - 10 metres
has upper boundary definition: Overlain by Eemian marine sands (Eem Formation), early Weichselian brackish-marine clays (Brown Bank Formation) or Holocene marine sands.

East Grampian (Albion) Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: EGAG
has current status: CURRENT
has theme: SPRFCL
notation: EGA
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41441
has lithology component: EGAG CLAY
has lithology component: EGAG DMTN
has lithology component: EGAG GRAV
has lithology component: EGAG SANDU
has lithology component: EGAG SILT
has source info: EGAG_50626
has source info: EGAG_51617
has source info: EGAG_52951
has obsolete equivalent: EGAG mn 2101
broader: Albion Glacigenic Group
narrower: Birnie Gravel Formation
narrower: Crossbrae Till Formation
narrower: Denend Gravel Formation
narrower: WLSG
narrower: LEY
narrower: LEYST
narrower: PIBG
narrower: POWSG
narrower: TBXSG
narrower: ROTIL
narrower: Bellscamphie Till Formation
has lower boundary definition: Sharp, unconformable contact with bedrock.
has geographical distribution: The East Grampian Highlands, Cairngorm Mountains and Gaick Plateau.
has lithology description: Suite of glacial, glaciofluvial and glaciolacustrine deposits that contain clasts derived predominantly from weathered Neoproterozoic metamorphic rocks (psammite, metagreywacke, slate) and Caledonian igneous rocks (granite, granodiorite, gabbro), including sandy diamictons (till), sand, gravel, silt and clay. Deposited from ice that radiated from the Eastern Grampian mountains.
has thickness description: To 10m
has upper boundary definition: Unconformable contact with units of the East Grampian Glacigenic Subgroup.

Ellens Geo Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: EGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

East Grampian Glacigenic Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: EGD
has current status: CURRENT
has theme: SPRFCL
notation: EG
has revision number: 4
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41444
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41442
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41443
has lithology component: EGD DMTN
has lithology component: EGD GRAV
has lithology component: EGD SANDU
has lithology component: EGD SILT
has source info: EGD_49806
has source info: EGD_50626
has source info: EGD_50775
has source info: EGD_51495
has source info: EGD_52951
has obsolete equivalent: EGD mn 1398
has obsolete equivalent: EGD mn 1399
has obsolete equivalent: EGD mn 2101
has obsolete equivalent: EGD mn 2103
broader: Caledonia Glacigenic Group
narrower: Byth Till Formation
narrower: Blairdaff Moraine Formation
narrower: HYTIL
narrower: Crovie Till Formation
narrower: Banchory Till Formation
narrower: LOSG
narrower: Glen Dye Silts Formation
has lower boundary definition: Unconformable: base of Banchory Till Formation.
has geographical distribution: The East Grampian Highlands.
has lithology description: Till, sand and gravel and laminated silt and clay, composed principally of decomposed Neoproterozoic metamorphic rocks and Caledonian igneous rocks; deposited by glacial ice that radiated from the East Grampian Highlands.
has thickness description: Very variable, generally 5 to 10m; more than 40m proved in some sections.
has upper boundary definition: Unconformable: top of Lochton Sand and Gravel Formation.

Eastern Gneisses And Hillswick Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: EGHI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NE

Ellenthorpe Gill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: EGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: EGL LMST
broader: Craven Group
has geographical distribution: Named after Ellenthorpe Gill, near Clitheroe, Lancashire.
has lithology description: Dark grey lenticular limestones.

East Greenland Province
type: Concept
in scheme: NamedRockUnit
alternative label: EGLND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: PR
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NATIG

Eastern Gneisses
type: Concept
in scheme: NamedRockUnit
alternative label: EGNS
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: AP
has lithology component: EGNS CALSIR
has lithology component: EGNS GNSS
has lithology component: EGNS MARBLE
has lithology component: EGNS OAMPHB
has lithology component: EGNS OGNHB
has lithology component: EGNS OGNSF
has lithology component: EGNS OGNSM
has lithology component: EGNS OGNSS
has lithology component: EGNS PDT
has lithology component: EGNS PSMGN
has lithology component: EGNS SCHGR
has lithology component: EGNS SEPITE
is obsolete equivalent of: EGNS LDUI
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/L
narrower: Benigarth Mica-Schist [?Formation]
narrower: SETQ

Edergole Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has obsolete equivalent: EGS mn 1416
broader: NE
has geographical distribution: Recognised in the Republic of Ireland.

Eglish Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EGSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41445
has lithology component: EGSA CONG
has lithology component: EGSA SDST
has lithology component: EGSA SLST
has source info: EGSA_50458
broader: Ballycastle Sandstone Group
has lower boundary definition: Unconformity with Dalradian.
has lithology description: Conglomerate, sandstone and thin sandy siltstone.
has thickness description: c. 185 m.
has upper boundary definition: Base of basalt lavas of succeeding Carey River Basalt Formation.

Egginton Common Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: EGSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41446
has lithogenesis: FLUV
has lithology component: EGSG C
has lithology component: EGSG S
has lithology component: EGSG V
has lithology component: EGSG Z
has source info: EGSG_49169
has source info: EGSG_50018
has source info: EGSG_50020
has source info: EGSG_50334
has source info: EGSG_50918
has source info: EGSG_51510
has source info: EGSG_52386
has source info: EGSG_52487
has source info: EGSG_52543
has source info: EGSG_52767
has source info: EGSG_52787
has obsolete equivalent: EGSG mn 1426
has obsolete equivalent: EGSG mn 1427
has obsolete equivalent: EGSG mn 2591
has obsolete equivalent: EGSG mn 2003
broader: TRVA
has additional age information: Middle Pleistocene (MI Stage 6). Formerly stated to be Wolstonian in original Informal Lexicon entry by A Brandon, 26/01/1998.
has lower boundary definition: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock.
has geographical distribution: Occurs as outliers on north bank of Trent in type area (Sheet 141); thought to be present upstream, particularly on the north bank of the Dove downstream of Uttoxeter (Sheet 140) and probably elsewhere, (e.g. on the south bank of the Trent near Alrewas, Sheet 154) but extent uncertain pending resurvey.
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold-phase sands and gravels that underlie the Egginton Common Terrace. Intensely cryoturbated, decalcified poorly sorted sand and gravel, dominated by rounded pebbles of "Bunter" quartz/quartzite (up to c.90%) with subordinate subangular flint (up to c.15%), Carboniferous chert, sandstone, etc., Fairly well developed and extensive terrace surface c.12-13m above the Trent/Dove floodplain in Type Area. Upper part locally includes a rubified paleosol (Hykeham Soil; Ipswichian). Correlated with the Borrowash Sand and Gravel Member (Derwent Valley Formation) and Burstall Sand and Gravel Member (Soar Valley Formation) and Balderton Sand and Gravel Member (Trent Valley Formation).
has thickness description: 0-c.4.5m.
has upper boundary definition: Ground surface.

Eastern Gneiss And Sand Voe Group [Intimate Mixture]
type: Concept
in scheme: NamedRockUnit
alternative label: EGSV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDMX
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: AZ
has lithology component: EGSV MSDR
has lithology component: EGSV OGNSS
broader: NA

Eastgate Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EGT
has current status: CURRENT
has theme: BEDRCK
notation: EGT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41447
has lithology component: EGT CONG
has lithology component: EGT MCASST
has lithology component: EGT PESST
has lithology component: EGT SDST
has source info: EGT_49017
has source info: EGT_52134
has obsolete equivalent: EGT mn 1405
broader: WGAT
has lower boundary definition: Transitional incoming of a predominantly sandstone succession belonging to the Eastgate Sandstone Member above the Kirk Hill Conglomerate Member of the Westgate Formation
has geographical distribution: Carmichael Inlier near Carmichael, Lanarkshire, Scotland
has lithology description: Mainly greyish medium-grained sandstone, locally a coarse-grained subgreywacke varying from dark greenish grey to pale red in colour. Also local thin beds of pebbly sandstone, conglomerate and micaceous sandstone
has thickness description: To 400m
has upper boundary definition: The fairly sharp base of the greywacke-pebble bearing Greywacke Conglomerate Formation above the predominantly sandstone succession of the Eastgate Sandstone Member of the Westgate Formation

Elsterian To Holsteinian Diamicton, Firm To Hard (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EHDFH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BH
has lithology component: EHDFH DMTN
broader: NA

Elsterian To Holsteinian Deposits, Undifferentiated (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EHDU
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BH
has lithology component: EHDU SED
broader: NA

Ehen Alluvium Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EHEN
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41450
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41448
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41449
has lithology component: EHEN C
has lithology component: EHEN S
has lithology component: EHEN V
has lithology component: EHEN Z
has source info: EHEN_48926
has source info: EHEN_49633
has source info: EHEN_49654
has source info: EHEN_49657
has source info: EHEN_50272
has source info: EHEN_51342
has obsolete equivalent: EHEN ALF
has obsolete equivalent: EHEN mn 78
broader: Cumbria-Lancashire Catchments Subgroup
has additional age information: Mainly Holocene (but terraces may extend into Lateglacial).
has lower boundary definition: Sharply erosional, unconformable on all older Quaternary deposits (particularly till) and bedrock.
has geographical distribution: 1:50k Sheets 37 Gosforth and 38 Whitehaven, western Cumbria and applied to all alluvial deposits within the west Cumbria area, between Whitehaven and Muncaster, of the Cumbria-Lancashire Catchments Subgroup area.
has lithology description: Sands, gravels silts and clays forming river terraces and underlying floodplains.
has thickness description: Typically up to 12m thick in the type area.
has upper boundary definition: The ground surface, or overlain by peat of the Blelhem Peat Formation, or overlain by blown sand of the Drigg Point Sand Formation.

Elsterian To Holsteinian Mud And Sand, Interbedded (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EHMAS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BH
has lithology component: EHMAS MUD
has lithology component: EHMAS MUDM
has lithology component: EHMAS S
has lithology component: EHMAS SND
broader: NA

Elsterian To Holsteinian Mud, Firm To Hard (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EHMFH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BH
has lithology component: EHMFH MUD
has lithology component: EHMFH MUDM
broader: NA

Elsterian To Holsteinian Sand (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EHSND
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BH
has lithology component: EHSND S
has lithology component: EHSND SND
broader: NA

Glac An Dorchadois Member, Brutach Dearg Member And Cnoc Creaghach Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: EIG35
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIG35 MUG
has lithology component: EIG35 OLBA
broader: Eigg Lava Formation

Eigg Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL BA
has lithology component: EIGL BALAVA
has lithology component: EIGL DOLR
has lithology component: EIGL MUG
has lithology component: EIGL OLBA
has source info: EIGL_52601
broader: NP
narrower: Glac An Dorchadois Member, Brutach Dearg Member And Cnoc Creaghach Member (Undifferentiated)
narrower: Gleann Charadail Member
narrower: Glac An Dorchadois Member
narrower: Brutach Dearg Member
narrower: Cnoc Creagach Member
narrower: Cora-Bheinn Member
narrower: Basal Member (Eigg Lava Formation)
narrower: PATS
narrower: Beinn Airein-An Stac Member

Laig Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL1 OLBA
broader: NE

Gleann Charadail Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL2 CONG
has lithology component: EIGL2 FPBA
has lithology component: EIGL2 MUG
has lithology component: EIGL2 OLBA
broader: Eigg Lava Formation

Glac An Dorchadois Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL3 OLBA
broader: Eigg Lava Formation

Brutach Dearg Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL4 OLBA
broader: Eigg Lava Formation

Cnoc Creagach Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL5
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL5 MUG
has lithology component: EIGL5 OLBA
broader: Eigg Lava Formation

Cora-Bheinn Member
type: Concept
in scheme: NamedRockUnit
alternative label: EIGL6
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGL6 BA
has lithology component: EIGL6 FPHAW
has lithology component: EIGL6 OLBA
broader: Eigg Lava Formation

Basal Member (Eigg Lava Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: EIGLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EIGLB BATUF
has lithology component: EIGLB FPHAW
has lithology component: EIGLB MUG
has lithology component: EIGLB OLBA
has lithology component: EIGLB VCBR
broader: Eigg Lava Formation

Eil-Arkaig Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: EILAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: EILAG LMPY
broader: Scottish Highlands Late Carboniferous To Permian Alkali Dyke Suite

Eildon Hills Laccolith
type: Concept
in scheme: NamedRockUnit
alternative label: EILD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: EILD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41452
has lithology component: EILD AGG
has lithology component: EILD BA
has lithology component: EILD TR
has lithology component: EILD TRR
has source info: EILD_48959
has source info: EILD_50846
broader: MVFTW
has lower boundary definition: Intrusive contact.
has geographical distribution: Eildon Hills, Melrose, Scottish Borders.
has lithology description: Trachyte.
has upper boundary definition: Intrusive contact.

Eilde Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EILDE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: EILDE PSAMI
has lithology component: EILDE PSAMIF
has lithology component: EILDE PSAMM
has lithology component: EILDE QZITE
has lithology component: EILDE SEMPEL
has lithology component: EILDE SPFLG
broader: Glen Spean Subgroup
narrower: LINN
narrower: RESS

Eilean Shona Neck
type: Concept
in scheme: NamedRockUnit
alternative label: EILSH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
broader: HLAND

Eighteen Inch Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: EITC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: EITC COAL
broader: NE

Ettrickbridge Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EKB
has current status: CURRENT
has theme: BEDRCK
notation: EKB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41453
has lithology component: EKB MDST
has lithology component: EKB SDST
has lithology component: EKB SLST
has lithology component: EKB WACKE
has source info: EKB_51723
has source info: EKB_52489
broader: LHG
has lower boundary definition: Within Upper Hartfell Shale Formation.
has geographical distribution: Southern Uplands of Scotland.
has lithology description: Sandstone turbidite unit.
has thickness description: c.55m
has upper boundary definition: Within Upper Hartfell Shale Formation.

Edendork Coal
type: Concept
in scheme: NamedRockUnit
alternative label: EKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: EKC COAL
broader: NE

East Kilbride Common Coal
type: Concept
in scheme: NamedRockUnit
alternative label: EKCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: EKCC COAL
broader: LSC

East Kirkton Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: EKL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: EKL LMST
broader: HON

Eskdalemuir Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EKM
has current status: CURRENT
has theme: BEDRCK
notation: EKM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41455
has lithology component: EKM MDST
has lithology component: EKM SDST
has lithology component: EKM SLST
has source info: EKM_49020
has source info: EKM_49071
has source info: EKM_49784
has obsolete equivalent: EKM HWK
has obsolete equivalent: EKM mn 1947
broader: HWK
has additional age information: Silurian, uppermost Llandovery.
has lower boundary definition: Faulted; stratigraphical contact not preserved.
has geographical distribution: Southern Scotland.
has lithology description: Sandstone, typically fine- to medium-grained but ranging from very fine- to coarse-grained. Generally medium- to thick-bedded over thicknesses of tens of metres interspersed with units up to few metres very thin to thin-bedded. Sparse very thick beds of massive sandstone. Interbedded siltstone or silty mudstone generally in thin beds. Sandstone and siltstone typically pale green when fresh with characteristic deep rusty brown weathering reflecting relatively high carbonate content. Distinguished from the Glendearg and Selcoth Formations by relatively high carbonate content and associated weathering character.
has thickness description: Uncertain, likely to be several thousand metres.
has upper boundary definition: Faulted; no stratigraphical contact preserved.

Ekofisk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EKOF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GD
has predominant age: GD
has youngest age: GD
broader: Chalk Group

Edgton Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SG
has obsolete equivalent: EL mn 1417
broader: Aston Mudstone Formation

East Lothian Basanite And Foiditic Plugs And Vents
type: Concept
in scheme: NamedRockUnit
alternative label: ELBAF
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: ELBAF BSN
has lithology component: ELBAF MONCHQ
broader: SCPPV
narrower: NBWKA
narrower: KDLAW

Ellenora Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: ELC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: ELC COAL
broader: ULGS

Elgin Calcrete Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELCA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ENC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has lithology component: ELCA CHRT
has lithology component: ELCA CLCRET
has lithology component: ELCA SDST
has source info: ELCA_49585
has source info: ELCA_50477
has lateral equivalent: ELCA st 215
has obsolete equivalent: ELCA CRNI
broader: Forres Sandstone Group
has lower boundary definition: Requires fieldwork, or further research.
has geographical distribution: The Moray Firth coast around Elgin.
has lithology description: Pale grey and reddish brown, calcareous, marly sandstones, which have been significantly replaced by calcite and chert.
has thickness description: Requires fieldwork, or further research.
has upper boundary definition: Requires fieldwork, or further research.

Ellel Crag Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: ELCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ElCr
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CO
has predominant age: CO
has youngest age: CO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41456
has lithology component: ELCR COAL
has lithology component: ELCR SDST
has source info: ELCR_48721
has source info: ELCR_49848
has source info: ELCR_52442
broader: SAML
has lower boundary definition: Abrupt change from mudstone of Dolphinholme Mudstone to sandstone of the Ellel Crag Sandstone.
has geographical distribution: Ellel and Forton, Lancashire.
has lithology description: Sandstone, fine-to-medium-grained, large scale cross-bedding; coaly layers.
has thickness description: 50 -70m
has upper boundary definition: Abrupt change from sandstone of the Ellel Crag Sandstone to mudstone/siltstone of overlying unnamed beds within the Millstone Grit Group.

Eilean Dubh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ED
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41458
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41457
has lithology component: ELD BREC
has lithology component: ELD CHRT
has lithology component: ELD DOLMST
has lithology component: ELD DOLO
has lithology component: ELD LMST
has source info: ELD_48901
has source info: ELD_49592
has source info: ELD_49989
has source info: ELD_50473
has source info: ELD_50712
has source info: ELD_51667
has source info: ELD_52035
has source info: ELD_52897
has obsolete equivalent: ELD mn 1434
broader: Durness Group
has lower boundary definition: Conformably overlies dark grey dolostones of the Ghrudaidh Formation. A zone of interbedded dark and pale grey dolostones occurs at the boundary. The base of the Eilean Dubh Formation is taken at the appearance of laminations and/or chert layers.
has geographical distribution: The Durness Group, which contains the Eilean Dubh Formation, forms a narrow, discontinuous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye.
has lithology description: Pale grey to buff, flaggy, laminated dolostones with intraformational breccias and minor chert development towards base and top of unit. Stromatolites particularly abundant in Durness area.
has thickness description: About 150 m thick.
has upper boundary definition: Conformably overlain by dark dolostones and white chert of the Sailmhor Formation.

Eglwyseg Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Ellergill Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ELG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
broader: NE

Eilean Liath Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELGT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has source info: ELGT_49443
broader: Colonsay Group

Eilean Dubh Formation And Ghrudaidh Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ELGU
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ED
has lithology component: ELGU DOLO
has lithology component: ELGU MARBLE
broader: Durness Group

Ellerker Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: ELL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41459
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41460
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41461
has lithology component: ELL LMST
has source info: ELL_51523
has source info: ELL_51991
has obsolete equivalent: ELL mn 2065
has obsolete equivalent: ELL mn 1443
broader: LLL
has additional age information: Lower Bajocian, Discites Zone.
has lower boundary definition: Quasi-conformable contact between predominantly calcareous mudstone and siltstone of underlying part of Raventhorpe Beds and porcellanous limestone of this informal Bed.
has geographical distribution: BGS 1:50 000 sheets 80, 89; northernmost Lincolnshire (the Humber area), northwards to the Market Weighton area.
has lithology description: Limestone, hard, porcellanous, silty, with fine-grained shell debris (silty, shell fragmental wackestone).
has supplementary information: Though defined here, this term should not be perpetuated. Even if deemed valid as a stratigraphical unit, its Member status should be dropped and informal (Ellerker Limestone) usage adopted. Member status is inappropriate as the Bed is within the Raventhorpe Beds "Member" (Gaunt et al., 1992), which is now placed within the Lower Lincolnshire Limestone MEMBER. Due to the confused status of the Ellerker Limestone and the Raventhorpe Beds, the Parent is indicated as the Lower Lincolnshire Limestone Member. The unit was not considered a member even by its inventors (Gaunt et al., 1992). It is a thin unit within the Raventhorpe Beds/Member (sensu Gaunt et al) that could be mapped in areas mostly north of the Humber. It is part of the Hydraulic Limestones of previous authors, which also included the underlying strata down to the base of the Raventhorpe Beds. Gaunt et al showed that it lay at a higher horizon that the Cleatham Limestone (approximating to the Hydraulic Limestones south of the Humber). Hence the different names, though both are essentially limestones "floating" close to the base of the Raventhorpe Beds and may be the same horizon. If not for the exclusion of the thin (typically 1m or so) underlying part of the Raventhorpe Beds it could be said that the Elerker/Cleatham Limestone IS the Hydraulic Limestone of older (pre-Ashton and Gaunt et al) accounts. Whereas the unit is a useful mapping entity it would better be indicated as "Limestone in Raventhorpe Beds". See also Cleatham Limestone. [Condensed from notes by M G Sumbler, 29/09/2005.]
has thickness description: 0 to c.1m.
has upper boundary definition: Quasi-conformable contact between porcellanous limestone of this informal Bed and predominantly calcareous mudstone and siltstone of the overlying part of the Raventhorpe Beds.

East Linton Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: ELLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41462
has lithology component: ELLA MUG
has lithology component: ELLA TUF
has source info: ELLA_49416
has source info: ELLA_51962
has obsolete equivalent: ELLA mn 1403
broader: Garleton Hills Volcanic Formation
has additional age information: Early Visean.
has lower boundary definition: The base is conformable or locally unconformable on the North Berwick Pyroclastic Member. The change is from basaltic pyroclastic rocks to mafic lava flows.
has geographical distribution: East Lothian, outcrop of the Garleton Hills Volcanic Formation around North Berwick, East Lothian, Garleton Hills, Stenton and in the subcrop farther west in the BGS Spilmersford Borehole near Pencaitland, but absent adjacent to the Lammermuir Fault.
has lithology description: The East Linton Lava Member consists characteristically of macroporphyritic ankaramites (Craiglockhart type) and basaltic hawaiites (Dunsapie type), both with olivine and clinopyroxene (large augite) phenocrysts and the latter, also plagioclase. Non-porphytic trachybasalts of mugearite type and one of leucite-bearing kulaite are also present. Beds of tuff and lapilli tuff also occur in the succession. Flows are usually 5 to 15m thick, the upper half being slaggy and vesicular.
has thickness description: 0 to 90m
has upper boundary definition: The Member is overlain by the Hailes Lava Member. The contact is conformable and locally unconformable. The change is from either ankaramite and basaltic hawaiites to olivine-basalt and mugearite.

Ell Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ELLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ELLC COAL
broader: MCMS

Ell Index Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: ELLI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ELLI COAL
broader: MCMS
has supplementary information: Might be a redundant (junior) synonym of GLASGOW ELL INDEX COAL (GEI).

Ellen Seam
type: Concept
in scheme: NamedRockUnit
alternative label: ELLN
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Ell Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: ELLW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ELLW COAL
broader: PMCM
has supplementary information: Locally becomes part of the Thick Coal.

Elmsall Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: ELMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: ELMC COAL
broader: PUCM

Elswick Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELMU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TN
has source info: ELMU_52697
broader: MMG
has geographical distribution: East Irish Sea Basin.

Eileans Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ELN
has current status: CURRENT
has theme: BEDRCK
notation: ELN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41466
has lithology component: ELN SDST
has source info: ELN_50587
has source info: ELN_51984
broader: Clyde Sandstone Formation
has lower boundary definition: Base not seen, presumed transitional on Millport Cornstones Member.
has geographical distribution: Cumbrae Islands in Strathclyde, Scotland.
has lithology description: Mainly white, cross-bedded sandstone.
has thickness description: About 150m
has upper boundary definition: Top not seen, presumed overlain by extrusive igneous rocks of the Clyde Plateau lavas.

Ellon Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELON
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: ELON AMPHB
has lithology component: ELON CALSIR
has lithology component: ELON MBA
has lithology component: ELON PEL
has lithology component: ELON PSAMM
has lithology component: ELON SEMPEL
broader: NA

Elsworth Rock Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41467
has lithology component: ELR CLAY
has lithology component: ELR LMST
has source info: ELR_48731
has source info: ELR_48732
has source info: ELR_49303
has source info: ELR_49305
has source info: ELR_49860
has source info: ELR_50825
has source info: ELR_51367
has source info: ELR_51898
has obsolete equivalent: ELR mn 3109
has obsolete equivalent: ELR mn 4579
has obsolete equivalent: ELR mn 1445
has obsolete equivalent: ELR mn 1448
has obsolete equivalent: ELR mn 1446
broader: Corallian Group
has lower boundary definition: Drawn at base of limestone and ironshot clay of the Elsworth Rock Formation where it rests conformably on the Upper Oxford Clay.
has geographical distribution: Cambridge district.
has lithology description: Highly variable, marly limestone bands and nodules and ferruginous, oolitic clays.
has thickness description: 2.5 - 10.5 metres.
has upper boundary definition: Drawn at conformable upward passage from limestone of the Elsworth Rock Formation to the Ampthill Clay.

Elrick Psammite And Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELRK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41468
has lithology component: ELRK CALSIR
has lithology component: ELRK PSAMI
has lithology component: ELRK PSAMM
has lithology component: ELRK QZITE
has lithology component: ELRK SEMPEL
broader: Corrieyairack Subgroup
has lower boundary definition: Poorly constrained, possibly unconformable, on Dava Succession semipelites and psammites.
has geographical distribution: Central Highlands of Scotland, Upper Strath Dearn.
has lithology description: Psammite and micaceous psammite interlayered with garnetiferous semipelite.
has thickness description: 1 to 2km.
has upper boundary definition: Transitional up into turbiditic psammites of the Loch Laggan Psammite Formation.

Elsham Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ELS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
has lithology component: ELS SDST
has obsolete equivalent: ELS mn 1444
broader: KC

Elton Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has obsolete equivalent: ELT mn 1449
broader: NP

Elenid Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: ELTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: PLYNT

Lower Elton Formation, Middle Elton Formation And Upper Elton Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ELTU
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
notation: Elt
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
has lithology component: ELTU LMST
has lithology component: ELTU MDST
has lithology component: ELTU SLST
has source info: ELTU_48656
has source info: ELTU_48904
has source info: ELTU_52529
has source info: ELTU_52681
has source info: ELTU_52724
has obsolete equivalent: ELTU mn 1450
has obsolete equivalent: ELTU mn 2682
broader: LLUS
has lithology description: See the Lithology descriptions for the component formations.

Elvington Glaciolacustrine Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELV
has current status: CURRENT
has theme: SPRFCL
notation: ELV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41470
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41469
has lithology component: ELV C
has lithology component: ELV S
has lithology component: ELV Z
has source info: ELV_49659
has obsolete equivalent: ELV mn 3871
has obsolete equivalent: ELV mn 1451
broader: NPEG
has lower boundary definition: Not observed. In most places the Elvington Glaciolacustrine Formation will overlie tills of the Vale of York Formation as proved in borehole SE64NE/10, where 4.6m of soft grey brown clay is recorded resting on "brown boulder clay" (glacial till).
has geographical distribution: The Elvington Glaciolacustrine Formation is constrained between the York Moraine Member to the north (between York in the west and Sand Hutton in the east) and the Escrick Moraine Member to the south (from Stillingfleet in the west to Sutton in the east. It extends as far west as Copmanthorpe and as far east as Sutton Upon Derwent.
has lithology description: Firm to stiff, rarely soft, mottled reddish brown (5YR 4/3) and grey (GLEY 2 3/1) thinly laminated clay. Sporadically interlaminated with silt and fine reddish brown sand. Commonly fissured. Gypsum, in the form of opaque, tabular selenite is found locally within the laminated clay below a depth of 2.5m. Crystal size is typically 15 to 35mm along the longest axis.
has thickness description: Minimum thickness of 4.2m proved in borehole (SE64NE/17)(SE6838 4634) but generally exceeds 5m in thickness. 4.6m proved in borehole SE64NE/10.
has upper boundary definition: An outcrop overlain by aeolian or fluvial sand or clayey sand. The contact is sharp where proven in auger bores.

Elbow Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ELW
has current status: CURRENT
has theme: SPRFCL
notation: ELW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: ELW CLAY
has lithology component: ELW PEAT
has lithology component: ELW SANDU
has source info: ELW_51535
has obsolete equivalent: ELW mn 1435
broader: NE
has lower boundary definition: Base of basal peat bed (where present).
has geographical distribution: Not defined.
has lithology description: Brackish-marine fine-grained sands and clays with discontinuous basal peat bed.
has thickness description: Not defined.
has upper boundary definition: Passage to fully marine sands.

Elwick Moraine Member
type: Concept
in scheme: NamedRockUnit
alternative label: ELWK
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41471
has lithology component: ELWK DMTN
has lithology component: ELWK S
has lithology component: ELWK V
has source info: ELWK_49811
has source info: ELWK_50508
has obsolete equivalent: ELWK mn 2938
has obsolete equivalent: ELWK mn 1452
broader: HNTI
has lower boundary definition: Uneven, unconformable contact on bedrock or dark brown stony sandy silty clay diamicton of the Wear Till Formation. Lateral unconformable contact with reddish brown stony sandy silty clay diamicton of the Horden Till Formation.
has geographical distribution: Lowlands of County Durham.
has landform description: Forms linear ridges and mounds with kettleholes.
has lithology description: Varied lithologies including ill-sorted gravel, red sand and red sandy diamicton with clasts of limestone and dolostone of the Zechstein Group (formerly Magnesian Limestone), Carboniferous lithologies (sandstone, limestone) and Cheviot andesite. Forming linear ridges and mounds with kettleholes.
has thickness description: To about 12m
has upper boundary definition: Generally the ground surface.

Elygrain Vent
type: Concept
in scheme: NamedRockUnit
alternative label: ELYG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: ELYG
has revision number: 0
has rock unit rank: WT
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41472
has lithology component: ELYG AGG
has lithology component: ELYG PYRBRC
has lithology component: ELYG TR
broader: KELSO
has lower boundary definition: Intrusive.
has geographical distribution: Hawick area, southern Scotland.
has lithology description: Pyroclastic breccia or agglomerate in vent, with intrusions of trachyte.
has thickness description: Vent, elongate, c.200m x 1500m
has upper boundary definition: Intrusive.

Easter Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: EMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: EMA COAL
broader: LSC

Eastside Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: EMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Embleton Microdiorite Intrusions
type: Concept
in scheme: NamedRockUnit
alternative label: EMBL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 1
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41473
has lithology component: EMBL AND
has lithology component: EMBL BA
has lithology component: EMBL DA
has lithology component: EMBL DOLR
has lithology component: EMBL GB
has lithology component: EMBL HBT
has lithology component: EMBL MCDI
has lithology component: EMBL MCGD
has lithology component: EMBL RY
has source info: EMBL_48986
has source info: EMBL_48988
has source info: EMBL_49573
has source info: EMBL_51591
has obsolete equivalent: EMBL mn 1453
broader: LDOMI
has lower boundary definition: Not defined.
has geographical distribution: The area east of Cockermouth, Cumbria.
has lithology description: Microdiorite, aphyric basalt, andesite and microgranodiorite. Radiometric age: 444 +/- 24 Ma (Rb-Sr whole rock) (Rundle, 1979).
has thickness description: Plugs and sheet-like masses emplaced into the Skiddaw Group.
has upper boundary definition: Not defined.

Embsay Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41474
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41476
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41475
has lithology component: EML BREC
has lithology component: EML CONG
has lithology component: EML LMST
has lithology component: EML SLMDST
has source info: EML_49284
has source info: EML_50903
has source info: EML_51817
has source info: EML_52031
has source info: EML_52844
has source info: EML_52858
has obsolete equivalent: EML mn 1454
has obsolete equivalent: EML ML
broader: HOM
has lower boundary definition: Drawn at base of boulder beds of the Embsay Limestone Member where it rests unconformably on mudstones. ('Halton Shales with Limestone' of Hudson and Mitchell, 1937).
has geographical distribution: Craven Basin, north-west England. (Lothersdale and Skipton Anticlines).
has lithology description: Pale packstones and grainstone, frequently pellety or oolitic and locally cherty, interbedded with dark, calcareous, silty mudstones, calcisiltites, conglomerates and breccias.
has thickness description: Up to 100 metres.
has upper boundary definition: Drawn at conformable upward passage from limestone of the Embsay Limestone Member to shaly calcisiltites and mudstones. ('Skibeden Shales with Limestone' of Hudson and Mitchell, 1937).

Eaglesham Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: EMLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41477
has lithology component: EMLA BAALK
has lithology component: EMLA TR
has lithology component: EMLA TRBA
has source info: EMLA_49087
has source info: EMLA_49575
has source info: EMLA_49708
has obsolete equivalent: EMLA mn 1390
broader: Clyde Plateau Volcanic Formation
has lower boundary definition: The base is apparently conformable on the Moyne Moor Lava Member that consists predominantly of trachybasalt, but might locally be unconformable.
has geographical distribution: Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, in the eastern part of the area between Newton Mearns (NS 575 518) and Eaglesham (NS 536 557).
has lithology description: The Eaglesham Lava Member consists of mainly macro- to micro-porphyritic olivine, clinopyroxene and plagioclase or plagioclase alkali-basalt lavas but include ankaramites and feldspathic trachybasalts. One trachytic flow is known.
has thickness description: To 250m
has upper boundary definition: The Member is overlain by the Dumdruff Hill Lava Member. The contact is considered conformable.

Emerald Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EMLD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: HMBG

Eype Mouth Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EMLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JT
has predominant age: JT
has youngest age: JT
has lithology component: EMLS LMST
broader: Beacon Limestone Formation

Edmondia Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: EMMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: EMMB MDST
has lithology component: EMMB SHMDST
has source info: EMMB_49180
has lateral equivalent: EMMB st 319
has lateral equivalent: EMMB st 455
has lateral equivalent: EMMB st 477
has lateral equivalent: EMMB st 555
has lateral equivalent: EMMB st 717
has lateral equivalent: EMMB st 860
has lateral equivalent: EMMB st 905
has obsolete equivalent: EMMB st 327
has obsolete equivalent: EMMB st 477
has obsolete equivalent: EMMB st 717
has obsolete equivalent: EMMB st 860
has obsolete equivalent: EMMB st 894
has lateral equivalent: EMMB st 327
has lateral equivalent: EMMB st 723
has lateral equivalent: EMMB st 894
has obsolete equivalent: EMMB st 319
has obsolete equivalent: EMMB st 455
has obsolete equivalent: EMMB st 555
has obsolete equivalent: EMMB st 723
has obsolete equivalent: EMMB st 905
broader: MCMS
broader: PMCM
broader: UCMS
has geographical distribution: Originally used as a local name in the coalfields of South Derbyshire, Derbyshire-Nottinghamshire and Yorkshire, but subsequently adopted as the standard name for the marine band at this level throughout the UK [Ramsbottom and others, 1978].

Exmouth Mudstone And Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EMSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EMS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41478
has lithology component: EMSA SDST
has lithology component: EMSA SLMDST
has source info: EMSA_49277
has source info: EMSA_49833
has source info: EMSA_50540
has source info: EMSA_51044
has source info: EMSA_52078
has source info: EMSA_52415
has source info: EMSA_52555
has obsolete equivalent: EMSA mn 1497
has obsolete equivalent: EMSA mn 1498
has obsolete equivalent: EMSA mn 1500
has obsolete equivalent: EMSA mn 1501
has obsolete equivalent: EMSA mn 1502
has obsolete equivalent: EMSA mn 1499
broader: Aylesbeare Mudstone Group
has lower boundary definition: In Exeter district, lower boundary taken at sharp change from the sandstone of the underlying Dawlish Sandstone, to mudstone. Between Lympstone and Exmouth the formation rests sharply and probably unconformably on the Exe Breccia (Selwood and others, 1984).
has geographical distribution: Extends from south Devon coast between Exmouth and Straight Point (SY 036 798) northwards through Exeter district to near Aylesbeare. Not recognised north of Aylesbeare (SY 030 923).
has lithology description: Reddish brown silty mudstones with intercalated reddish brown lenticular sandstone beds, exceptionally to 30m thick, but mostly 5 to 10m thick. The thickest, most persistent, sandstones occur at the top, and probably correlate with sandstones exposed at Straight Point on the coast.
has thickness description: About 200m in Exeter district; 255m on the coast (Selwood and others, 1984).
has upper boundary definition: See definition of lower boundary of Littleham Mudstone.

Eagle Moor Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: EMSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/41479
has lithogenesis: FLUV
has lithology component: EMSG C
has lithology component: EMSG S
has lithology component: EMSG V
has lithology component: EMSG Z
has source info: EMSG_48837
has source info: EMSG_49166
has source info: EMSG_49168
has source info: EMSG_49450
has source info: EMSG_49709
has source info: EMSG_50347
has source info: EMSG_50409
has source info: EMSG_50603
has source info: EMSG_50918
has source info: EMSG_50951
has source info: EMSG_52160
has source info: EMSG_52267
has source info: EMSG_52386
has source info: EMSG_52457
has source info: EMSG_52487
has obsolete equivalent: EMSG mn 1388
has obsolete equivalent: EMSG mn 2004
has obsolete equivalent: EMSG ORSG
has obsolete equivalent: EMSG mn 4393
has obsolete equivalent: EMSG mn 1389
has obsolete equivalent: EMSG GSG
broader: TRVA
has additional age information: Middle Pleistocene (MI Stage 12 or 10). Formerly stated simply to be Anglian in original Informal Lexicon entry by A Brandon, 26/01/1998.
has lower boundary definition: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock or locally, east of Eagle Moor, on the Skellingthorpe Clay Member of the Wolston Formation.
has geographical distribution: Newark on Trent to Lincoln Gap (British Geological Survey sheets 113, 114, 126, 126; see Brandon and Sumbler, 1991, Figure 1) with probable outliers upstream in the Uttoxeter-Derby area (sheets 140, 141; included in Trent, Trent-Derwent and Soar Valley formations) and possibly elsewhere.
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold-phase sands and gravels that underlie the Eagle Moor Terrace. Dominated by rounded pebbles of "Bunter" quartz/quartzite with subordinate subangular flint (typically 25% in the Type Area), etc. Clayey and poorly sorted. In Type Area occurs as hill-top outliers falling from c.36m OD near Newark (c.25m above Trent floodplain) towards the Lincoln Gap, being at c.+32m OD at Eagle Moor and possibly descending more rapidly to the east. Outliers upstream in the Loughborough district 30m+ above Trent floodplain. Correlated with the Martin Sand and Gravel Member (Trent Valley Formation), east of the Lincoln Gap.
has thickness description: 0 to c. 6m; typically c. 2 to 3m
has upper boundary definition: Ground surface.

Embury Shale
type: Concept
in scheme: NamedRockUnit
alternative label: EMY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EMY MDST
broader: Crackington Formation
has lithology description: Black sulphurous shaly mudstones with calcareous nodules yielding goniatites characteristic of the Subcrenatum Marine Band.

Enville Member
type: Concept
in scheme: NamedRockUnit
alternative label: EN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: En
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38399
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38401
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38400
has lithology component: EN CONG
has lithology component: EN MDST
has lithology component: EN PESST
has lithology component: EN SDST
has source info: EN_48659
has source info: EN_49786
has source info: EN_49788
has source info: EN_49789
has source info: EN_51029
has source info: EN_51197
has source info: EN_52614
has source info: EN_52630
has obsolete equivalent: EN mn 548
has obsolete equivalent: EN mn 747
has obsolete equivalent: EN mn 1459
has obsolete equivalent: EN mn 1460
broader: SAL
has lower boundary definition: Poorly defined; taken arbitrarily at base of sandstone dominated succession that overlies the Alveley Member and is characterised by conglomerates and pebbly sandstones with extra-basinal clasts, commonly of Carboniferous limestone and chert.
has geographical distribution: Salop and West Midlands.
has lithology description: Red mudstone and red-brown, fine- to coarse-grained sandstone, locally pebbly, and lenticular beds of conglomerate. Sandstone mostly sublitharenite; conglomerate clasts mostly Carboniferous limestone and chert.
has thickness description: 100-275m in West Midlands.
has upper boundary definition: Unconformable/disconformable; sharp junctions with overlying Clent Formation (breccia) in the Clent Hills; gradational boundary with mudstone dominated Clent Formation; or taken at the base of red mudstone/sandstone with Uriconian volcanic clasts in Gospel End area (West Midlands)

Ennerdale Intrusion, Diorite [Obsolete Code: Use Enin + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ENDI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Endrick Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: ENDR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38403
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38402
has lithology component: ENDR C
has lithology component: ENDR S
has lithology component: ENDR Z
has source info: ENDR_49147
has source info: ENDR_49148
has source info: ENDR_51103
has source info: ENDR_52969
has obsolete equivalent: ENDR mn 1455
broader: SRCK
has lower boundary definition: Transitional base with the underlying Kilmaronock Silt Member (Strathendrick Formation).
has geographical distribution: The Endrick Sand Member of the Strathendrick Formation is only known to occur in its type area in the Loch Lomond basin including the lower part of the Endrick valley.
has lithology description: The Mains of Kilmaronock Borehole (Browne and McMillan, 1989, Figure 6) contains the standard section in the Endrick Sand Member (5.99m to 13.6m in depth). The typical lithology is loose, fine- to medium-grained sand with some silt layers. The deposit is reddish brown and contains abundant plant remains and some dark organic clay bands. The sand usually appears to be flat-bedded but traces of cross-bedding are also present. Overall the deposit becomes coarser-grained upwards. The sediment at Mains of Kilmaronock might have been deposited by a meandering river in similar environments to those of the present Endrick. They could also be partly deltaic in origin.
has thickness description: Veneer to over 7.5m
has upper boundary definition: Sharp conformable contact with the overlying Erskine Clay Member (Clydebank Clay Formation).

Edge Hill Nine Foot Coal (New Cumnock Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ENF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ENF COAL
broader: LSC

Ennerdale Intrusion, Granite [Obsolete Code: Use Enin + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ENGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Ennerdale Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: ENIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38404
has lithology component: ENIN DI
has lithology component: ENIN DOLR
has lithology component: ENIN GNGP
has lithology component: ENIN MCGN
has source info: ENIN_49546
has source info: ENIN_49547
has source info: ENIN_51234
has source info: ENIN_51828
has obsolete equivalent: ENIN mn 1458
broader: LDFP
has lower boundary definition: Not defined.
has geographical distribution: From Wasdale to Ennerdale, western Lake District.
has lithology description: A medium-grained granophyric granite and microgranite, with zones of diorite, dolerite and hybridised rocks.
has thickness description: A laccolith, about 1km thick, and with an area of about 53 sq. km intruded into the Skiddaw Group and the lower part of the Borrowdale Volcanic Group.
has upper boundary definition: Not defined.

Earnock Blackband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: ENKB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: NE

Earnock Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: ENKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
broader: NE

Enler Group
type: Concept
in scheme: NamedRockUnit
alternative label: ENLE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has lithology component: ENLE BREC
has lithology component: ENLE MDST
has lithology component: ENLE SANDU
has lithology component: ENLE SDST
has lithology component: ENLE WACKE
has source info: ENLE_52352
has source info: ENLE_52667
broader: NE
narrower: Carlane Sandstone Formation
has lower boundary definition: Drawn at base of breccia of the Coolbeg Breccia Formation where it rests unconformably on turbidites of the Tullykevin Formation.
has geographical distribution: County Down, Northern Ireland.
has lithology description: Breccia containing greywacke, sandstone and mudstone set in a sandy matrix. Red-brown buff and white sandstone and red-brown silstone.
has thickness description: About 320 m thick.
has upper boundary definition: Drawn at conformable upward passage from sandstone of the Kennel Sandstone Formation to breccia of the Newforte Breccia Formation.

Ennerdale Intrusion, Granophyre [Obsolete Code: Use Enin + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ENN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Ennerdale Intrusion, Microdiorite [Obsolete Code: Use Enin + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ENNR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Esha Ness Sedimentary Rocks
type: Concept
in scheme: NamedRockUnit
alternative label: ENS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Enterkin Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ENT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ent
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38405
has lithology component: ENT MDST
has lithology component: ENT SDST
has lithology component: ENT SEATS
has lithology component: ENT SLST
has source info: ENT_52337
has obsolete equivalent: ENT mn 2613
has lateral equivalent: ENT st 293
broader: Clackmannan Group
has additional age information: Brigantian to early Pendleian.
has lower boundary definition: Unconformable on Lower Palaeozoic turbidites.
has geographical distribution: Northern part of the Thornhill Basin, Enterkin Burn, River Nith, Starn Burn.
has lithology description: Reddened fossiliferous marine mudstone, sandstone and seatearth.
has thickness description: 25m
has upper boundary definition: Unconformably overlain by Upper Carboniferous strata.

Esha Ness Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ENV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: ENV AND
has lithology component: ENV ANDH
has lithology component: ENV OLBA
has lithology component: ENV PSPYR
has lithology component: ENV RY
has lithology component: ENV RYLAVA
has lithology component: ENV RYTUF
has lithology component: ENV SDST
has lithology component: ENV TFASST
broader: STMA

East Ogwell Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EOL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DR
has lithology component: EOL LMST
has obsolete equivalent: EOL mn 1404
broader: TBAY
narrower: PUL
narrower: Blair Hill Tuff Member

Eocene To Miocene Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: EOMIO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: NM
broader: NP

Eocene To Pliocene Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: EOPC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: NO
broader: NE

Edmondia Punctatella Bed
type: Concept
in scheme: NamedRockUnit
alternative label: EP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
broader: NE

Emley Rock
type: Concept
in scheme: NamedRockUnit
alternative label: ER
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ER MDST
has lithology component: ER SDST
broader: PLCM
has geographical distribution: West Yorkshire area [Emley, Yorkshire].
has lithology description: The Emley Rock is a fine-grained flaggy sandstone with mudstone partings.

Ercall Granophyre
type: Concept
in scheme: NamedRockUnit
alternative label: ERCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: A3
has predominant age: A3
has youngest age: A3
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38406
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38407
has lithology component: ERCL GN
has lithology component: ERCL GNGP
has source info: ERCL_49098
has source info: ERCL_50177
has source info: ERCL_50408
has source info: ERCL_50774
has source info: ERCL_51676
has lateral equivalent: ERCL st 820
broader: UO
has additional age information: Late Neoproterozoic.
has lower boundary definition: Unknown.
has geographical distribution: Shropshire, Welsh Borders.
has lithology description: Granophyric granite.
has thickness description: Unknown.
has upper boundary definition: Not applicable: unconformably overlain by Lower Cambrian sandstones.

Erwan Fach Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ERFA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has lithology component: ERFA MDST
has lithology component: ERFA SDST
broader: NP

Ernan-Glass Metabasic Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: ERGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: ERGL MBA
has lithology component: ERGL MDOLFO
has lithology component: ERGL MDOLFS
has lithology component: ERGL MDOLR
broader: NA

Eglwys Rhobell Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ERL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
broader: NE

Erlend Basalts
type: Concept
in scheme: NamedRockUnit
alternative label: ERLBA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GE
has lithology component: ERLBA BA
broader: NE
has geographical distribution: FAROE-SHETLAND BASIN

Erlend Acid-Intermediate Intrusives
type: Concept
in scheme: NamedRockUnit
alternative label: ERLI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GE
has lateral equivalent: ERLI st 299
broader: NE
has geographical distribution: FAROE-SHETLAND BASIN

Glacial Erratic (Parent Rock Unspecified)
type: Concept
in scheme: NamedRockUnit
alternative label: ERRA
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: ERRA LMST
broader: NE
has lithology description: Variable lithology. A glacially transported rock whose lithology shows it could not have been eroded from the local 'country' rocks. [Generic description].

Errol Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ERRCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38408
has lithology component: ERRCL C
has lithology component: ERRCL S
has lithology component: ERRCL Z
has source info: ERRCL_50918
has source info: ERRCL_52744
has lateral equivalent: ERRCL st 300
has obsolete equivalent: ERRCL mn 1467
broader: British Coastal Deposits Group
narrower: LCL
narrower: SPYCL
has lower boundary definition: Unconformable, draped contact with underlying glaciofluvial sand and gravel or till.
has geographical distribution: East coast and firths of Scotland from Berwick-upon-Tweed to Inverness.
has lithology description: Massive to thinly bedded and coarsely laminated calcareous, silty and sandy clay interbedded with sand, commonly forming a fining-upwards sequence. Generally reddish brown, but locally brownish and yellowish grey or pale to dark grey. Streaks and mottling of dark grey to black sulphide are common and calcareous concretions occur towards the base locally. Contains a sparse glaciomarine fauna.
has thickness description: To at least 12m
has upper boundary definition: Overlain conformably at the type section by dark grey clay of the Powgavie Clay Formation.

Errington Member
type: Concept
in scheme: NamedRockUnit
alternative label: ERRM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Eriboll Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ERSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ERS
has revision number: 4
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38410
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38409
has lithology component: ERSA CONG
has lithology component: ERSA FAREN
has lithology component: ERSA MDST
has lithology component: ERSA QAREN
has lithology component: ERSA QZITE
has lithology component: ERSA SDST
has source info: ERSA_48901
has source info: ERSA_49592
has source info: ERSA_49989
has source info: ERSA_50473
has source info: ERSA_50712
has source info: ERSA_51799
has source info: ERSA_52035
has source info: ERSA_52639
has source info: ERSA_52897
has obsolete equivalent: ERSA mn 131
has obsolete equivalent: ERSA mn 1465
has lateral equivalent: ERSA st 298
has obsolete equivalent: ERSA st 298
broader: Ardvreck Group
narrower: PPR
narrower: BAQ
narrower: FBQ
has lower boundary definition: Defined where a thin conglomerate at the base of the Basal Quartzite Member lies above an angular unconformity and oversteps both the Complex and the Torridon Group
has geographical distribution: The Eriboll Formation forms a narrow belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt, Dundonnell, Kinlochewe and Kishorn, to Skye
has lithology description: Predominantly quartz arenite and quartzite with a thin basal conglomerate. Comprises a lower unit (Basal Quartzite Member) and an upper unit containing abundant Skolithos burrows (Pipe Rock Member).
has thickness description: From 150 m - 225 m thick.
has upper boundary definition: Defined at the boundary with the overlying Fucoid Beds Member of the Ant-Sron Formation

Erskine Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: ERSK
has current status: CURRENT
has theme: SPRFCL
notation: ERSK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38412
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38411
has lithology component: ERSK C
has lithology component: ERSK CZ
has lithology component: ERSK S
has lithology component: ERSK V
has lithology component: ERSK Z
has source info: ERSK_49147
has source info: ERSK_49148
has source info: ERSK_50918
has source info: ERSK_51103
has source info: ERSK_51617
has source info: ERSK_52969
has obsolete equivalent: ERSK mn 1468
broader: Clydebank Clay Formation
has lower boundary definition: The Erskine Clay Member of the Clydebank Clay Formation rests with angular unconformity on older Quaternary sediments or on bedrock. It is known to rest unconformably on the Inverleven Gravel Member of the Clyde Clay Formation and possible disconformably on the Endrick Sand Member of the Strathendrick Formation (Clyde Catchments Subgroup).
has geographical distribution: The Erskine Clay Member of the Clydebank Clay Formation is recognised in the lower Clyde valley and in the estuary of the Clyde, and in Loch Lomond.
has lithology description: The typical lithology is of very silty clay with sand and silt laminae and bands. The deposit is generally brownish grey of greyish brown and contains sulphide. The sand and silt is ripple-laminated in places. Isolated cobbles and gravel are present, and organic debris is also to be found. The deposit is of firm to soft consistency and medium plasticity.
has thickness description: Veneer to more than 4m
has upper boundary definition: The Erskine Clay Member of the Clydebank Clay Formation is overlain by younger Quaternary sediments, normally the Gourock Sand Member. It is also exposed at the surface in the lower Clyde valley.

Earthy Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: ERTY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: ERTY COAL
broader: NE

Eryry Glacigenic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ERYG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: WALES

Elgol Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ESA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has lithology component: ESA SDST
broader: Great Estuarine Group
has additional age information: Late Bajocian to Early Bathonian.

Easton Seven Feet Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ESFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ESFC COAL
broader: SWLCM

Eskdale Intrusion, Granodiorite [Obsolete Code: Use Esk + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ESGD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has lithology component: ESGD GD
broader: NE

Eskdale Intrusion, Microgranite [Obsolete Code: Use Esk + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ESGM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Eskdale Intrusion, Granite [Obsolete Code: Use Esk + Rock Type]
type: Concept
in scheme: NamedRockUnit
alternative label: ESGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NE

Eglinton Shelly Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: ESHTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38419
has lithology component: ESHTI C
has lithology component: ESHTI V
has lithology component: ESHTI Z
has source info: ESHTI_49726
has source info: ESHTI_50565
has source info: ESHTI_50918
has obsolete equivalent: ESHTI mn 4316
has lateral equivalent: ESHTI st 284
broader: WITI
has lower boundary definition: Sharp, unconformable, planar to gently undulating contact with dark brown, laminated organic silt and clay of the Sourlie Organic Silt Formation.
has geographical distribution: West central Scotland.
has lithology description: Pinkish brown, very stiff, pebbly sandy silty clay diamicton containing clasts of local sandstone, mudstone, coal and dolerite, far travelled sedimentary, igneous and metamorphic rocks and shell fragments, including sparse paired valves of marine molluscs yielding Late Devensian amino acid ratios. (Described as being similar to the shelly lodgement tills of Ayrshire, but probably a deformation till).
has thickness description: To 3.5m
has upper boundary definition: Sharp, convex-up, undulose unconformity with overlying dark grey silty sandy stony clay diamicton of the Auchenwinsey Till Member.

Enfield Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: ESI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38420
has lithogenesis: AEOLD
has lithogenesis: FLUV
has lithology component: ESI C
has lithology component: ESI Z
has source info: ESI_51453
has obsolete equivalent: ESI mn 1456
has obsolete equivalent: ESI BRK
broader: MNHD
has lower boundary definition: Rests on river terrace deposits.
has geographical distribution: Lea Valley tributary of Thames. North London, Sheet 256.
has lithology description: Varies from silt to clay, commonly yellow-brown and massive. [Generic description].
has thickness description: 1 to 5m, average 2m in thickness.
has upper boundary definition: At surface.

Eskdale Intrusions
type: Concept
in scheme: NamedRockUnit
alternative label: ESK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 2
has rock unit rank: LD
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38422
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38421
has lithology component: ESK GD
has lithology component: ESK GN
has lithology component: ESK GREIS
has lithology component: ESK MCGD
has lithology component: ESK MCGN
has source info: ESK_48986
has source info: ESK_49546
has source info: ESK_49547
has source info: ESK_50129
has source info: ESK_51759
has obsolete equivalent: ESK mn 1474
has obsolete equivalent: ESK mn 1476
has obsolete equivalent: ESK mn 1477
has obsolete equivalent: ESK mn 1457
broader: LDFP
has lower boundary definition: Two sheet-like masses of granite and granodiorite cropping out over 53 and 23 sq. km respectively, and intruded into the Skiddaw Group and the Borrowale Volcanic Group.
has geographical distribution: Corney Fell to Wasdale, western Lake District.
has lithology description: A pink, medium-grained muscovite granite, aphyric and porphyritic microgranite, coarse-grained granite, medium-grained granodiorite, microgranodiorite, biotite-rich granodiorite, and quartz-mica greisen locally containing topaz and quartz-andalusite rock associated with granite. The age of the granite is 450 +/- 3 Ma (U-Pb, zircon) (Hughes et al, 1996)
has thickness description: Unspecified.
has upper boundary definition: Not defined.

Eskdale Moor Injection Breccia
type: Concept
in scheme: NamedRockUnit
alternative label: ESKM
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Escrick Moraine Member
type: Concept
in scheme: NamedRockUnit
alternative label: ESKRM
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38425
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38426
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38423
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38424
has lithology component: ESKRM CVS
has lithology component: ESKRM SCV
has lithology component: ESKRM VS
has source info: ESKRM_51252
has source info: ESKRM_51359
has source info: ESKRM_51846
has obsolete equivalent: ESKRM mn 1470
has obsolete equivalent: ESKRM mn 2938
broader: VYORK
has lower boundary definition: Not exposed. The Escrick moraine is generally resting in older glaciolacustrine deposits of the Heminbrough Glaciolacustrine Formation. The contact between these two deposits can be irregular and glaciotectonised.
has geographical distribution: The limites of this Member are defined by the morphological limits of the Escrick Moraine from Stillingfleet in the west past Elvington towards Stamford Bridge in the north.
has lithology description: Mainly greyish brown to yellowish brown, poorly sorted, gravelly sandy clay to slightly gravelly clay matrix with a little, ranging to much, gravel and cobbles (Morainic Till).
has thickness description: Up to 20 to 30m recorded in borehole SE44SE/364 and 18.4m in borehole SE44SE/356; in type section it is up to 13.4m thickand in all boreholes the deposit rests on thin laminated clay belonging to underlying Heminbrough Glaciolacustrine Formation.
has upper boundary definition: Not exposed, or the present land surface. The unit is overlain locally by younger fluvial and aeolian deposits.

Eskett Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ESKT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: ESKT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38428
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38427
has lithology component: ESKT COAL
has lithology component: ESKT LMST
has lithology component: ESKT MDST
has lithology component: ESKT SDST
has lithology component: ESKT SEATS
has source info: ESKT_48926
has source info: ESKT_48977
has source info: ESKT_49423
has source info: ESKT_49538
has source info: ESKT_51342
has source info: ESKT_52309
has source info: ESKT_52989
has obsolete equivalent: ESKT mn 2506
has obsolete equivalent: ESKT mn 1626
has obsolete equivalent: ESKT mn 3218
broader: Great Scar Limestone Group
narrower: JNCL
narrower: LM1
narrower: LM2
narrower: LM3
narrower: LM4
narrower: LM5
narrower: LM6
narrower: L1L2
narrower: L3L4
narrower: L5L6
narrower: OBS
narrower: SH1
narrower: SH3
narrower: SH4
narrower: SH5
has lower boundary definition: The base of the Sixth Limestone Member, at the base of the lowest significant limestone bed above the mudstone, at the top of the underlying Seventh Limestone Formation.
has geographical distribution: West and North Cumbria between Whitehaven and Penrith. The western limit is the truncation below the Permo-Triassic basal unconformity. The Eastern limit is taken at the Kirk Rigg Fault along the line of the A66 highway, west of Penrith (McCormack, 2001).
has lithology description: Limestone with thin interbeds of sandstone, siltstone, mudstone, bentonitic mudstone and seatearth mudstone.
has thickness description: From 100m to 150m
has upper boundary definition: The top of the First/Great Limestone Member, marked by a succession from thick-bedded limestone to mudstone and sandstone of the Hensingham Grit Member.

Ellery Syke Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: ESL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: ESL LMST
broader: LYN

Esk Pike Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ESP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EsP
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38429
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38430
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38431
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38432
has lithology component: ESP LPTUF
has lithology component: ESP TUF
has lithology component: ESP VCBR
has lithology component: ESP VCMST
has lithology component: ESP VCSLST
has lithology component: ESP VCSST
has source info: ESP_49271
has source info: ESP_49453
has source info: ESP_50871
has source info: ESP_51921
has obsolete equivalent: ESP mn 1473
has obsolete equivalent: ESP mn 1472
broader: Borrowdale Volcanic Group
has lower boundary definition: Base of bedded volcaniclastic sedimentary rock sequence, unconformably overlying Lincomb Tarns Tuff Formation (dacitic lapilli-tuff).
has geographical distribution: Esk Pike - Great End - Alton Crags; Easdale, Helvellyn, Scandale, Grisedale and Hartsop Dodd, Cumbria.
has lithology description: In Type Area, laminated volcaniclastic mudstone and siltstone ("hornstone") with interbeds of volcaniclastic sandstone and eutaxitic lapilli tuff. Becoming massive bedded volcaniclastic sandstone with intercalations of volcaniclastic breccia, tuff and lapilli-tuff to the east.
has thickness description: 170m in Central Fells, reaching 200m in the Helvellyn area
has upper boundary definition: Not seen in Type Area, but around Hellvellyn it is defined by the base of various overlying formations, including the Middle Dodd Dacite, Deepdale and Helvellyn formations.

Essie Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ESTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38433
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38434
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38435
has lithology component: ESTI CLAY
has lithology component: ESTI GRAV
has lithology component: ESTI SANDU
has lithology component: ESTI SILT
has source info: ESTI_50626
has source info: ESTI_51724
has source info: ESTI_52951
has obsolete equivalent: ESTI mn 507
broader: Banffshire Coast And Caithness Glacigenic Subgroup
narrower: Arnhash Till Member
has lower boundary definition: Sharp uncomformable, undulating contact with Hatton Till Formation or bedrock, or gradational, planar, glacitectonic contact with laminated silt and clay of the Ugie Clay Formation. At partial type section NK05SE 1 the unit unconformably overlies unnamed greenish grey sand and gravel, which in turn rests on olive brown diamicton of the Hythie Till Formation.
has geographical distribution: Buchan, northeast Scotland, between Peterhead and Fraserburgh, on sheets 97 and 87E.
has lithology description: Pebbly sandy silty clay diamicton, calcareous, dark bluish grey but mottled orangey brown near top, and dark greenish grey at depth, containing well-dispersed clasts of red granite, quartzite and schistose metasediments, and sparse fragments of shell, red marl, red sandstone and chalk. The unit locally includes rafts of red clayey diamicton and black fossiliferous mudstone. Commonly including a lower unit that is dark reddish brown.
has thickness description: To 10m.
has upper boundary definition: Generally sharp, erosional with overlying glaciofluvial or alluvial sand and gravel or ground surface.

East Stayvoyage Vein
type: Concept
in scheme: NamedRockUnit
alternative label: ESV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38436
has source info: ESV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Eathie Beds
type: Concept
in scheme: NamedRockUnit
alternative label: ETB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JD
has predominant age: JD
has youngest age: JD
broader: NE

Edge Hill Eleven Foot And Three Foot Coals (New Cumnock Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ETC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ETC COAL
broader: LSC

Etruria Formation, Halesowen Formation And Salop Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: ETHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: ETHS AGG
has lithology component: ETHS AROC
has lithology component: ETHS COAL
has lithology component: ETHS CONG
has lithology component: ETHS LMST
has lithology component: ETHS MDST
has lithology component: ETHS PESST
has lithology component: ETHS SDST
has lithology component: ETHS SEATM
has lithology component: ETHS TUF
broader: WAWK
has lithology description: See the Lithology descriptions for the component formations.

Earlswood Till
type: Concept
in scheme: NamedRockUnit
alternative label: ETIL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: GLACI
has lithology component: ETIL DMTN
broader: NE

Eighteen Inch Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: ETIN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: ETIN COAL
broader: PLCM

Etive Dyke Swarm
type: Concept
in scheme: NamedRockUnit
alternative label: ETIVD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SW
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: ETIVD AND
has lithology component: ETIVD FELS
has lithology component: ETIVD LMPY
has lithology component: ETIVD MCDI
has lithology component: ETIVD MCDIP
has lithology component: ETIVD MCDIPF
broader: SDCAD

Etive Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: ETIVE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: ETIVE MZGN
has lithology component: ETIVE QDI
has lithology component: ETIVE QMZDI
has obsolete equivalent: ETIVE mn 1483
broader: Argyll And Northern Highlands Granitic Suite
narrower: MLODR
narrower: Cruachan Intrusion
narrower: QARRY
narrower: STRAV

Etruria Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ETM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Et
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38438
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38439
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38440
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38437
has lithology component: ETM AGG
has lithology component: ETM COAL
has lithology component: ETM CONG
has lithology component: ETM MDST
has lithology component: ETM SDST
has lithology component: ETM TUF
has source info: ETM_49789
has source info: ETM_51652
has obsolete equivalent: ETM mn 1484
has obsolete equivalent: ETM mn 1485
has obsolete equivalent: ETM mn 2234
has obsolete equivalent: ETM mn 3668
has obsolete equivalent: ETM mn 129
has obsolete equivalent: ETM mn 1486
has obsolete equivalent: ETM mn 1882
has obsolete equivalent: ETM mn 3127
broader: WAWK
has lower boundary definition: Passage by alternation from grey mudstones of the Pennine Coal Measures Group to red, purple mudstone of the Etruria Formation. Locally, in Shropshire, Warwickshire and Lincolnshire, the lower boundary is an unconformity (Symon Unconformity).
has geographical distribution: English Midlands, Lancashire, Yorkshire and North Wales.
has lithology description: Red, purple, brown, ochreous, green, grey and commonly mottled mudstone, with lenticular greenish-grey, referred to as 'espleys', common pedogenic horizons, but coal seams are rare.
has thickness description: Up to about 300 m thick in the type area.
has upper boundary definition: Overlain conformably by predominantly grey sandstone and mudstone strata of the Halesowen Formation, although locally, in South Staffordshire the upper boundary is an unconformity.

Etive Rhyolite Member
type: Concept
in scheme: NamedRockUnit
alternative label: ETRH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Glencoe Volcanic Formation
narrower: Crowberry Ridge Tuff
narrower: MIER
narrower: KHOB
narrower: KHOT
narrower: UPER
narrower: LOER
narrower: RGT

Ettrick Group
type: Concept
in scheme: NamedRockUnit
alternative label: ETRK
has current status: CURRENT
has theme: BEDRCK
notation: ETRK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38441
has lithology component: ETRK MDST
has lithology component: ETRK SDST
has lithology component: ETRK SLST
has source info: ETRK_49184
has source info: ETRK_49735
has source info: ETRK_50301
has source info: ETRK_52089
has source info: ETRK_52473
has source info: ETRK_52702
has obsolete equivalent: ETRK mn 1688
has obsolete equivalent: ETRK mn 1947
has obsolete equivalent: ETRK mn 3446
has obsolete equivalent: ETRK mn 659
has obsolete equivalent: ETRK HWK
has obsolete equivalent: ETRK mn 3447
broader: NA
narrower: Grieston Formation
narrower: KKHP
narrower: SEO
narrower: TLEE
narrower: Glendearg Formation
has additional age information: Llandovery: guerichi Biozone to spiralis Biozone.
has lower boundary definition: Conformable sedimentary contact with the Moffat Shale Group.
has geographical distribution: Southern uplands. Scotland.
has lithology description: Interbedded turbidite (wacke) sandstone and mudstone/siltstone. Sandstone typically fine- to medium-grained but ranging from very fine- to coarse-grained; generally medium- to very thick-bedded (commonly up to 2m) over thicknesses of tens of metres interspersed with units up to a few metres very thin to thin-bedded. Units of coarse-grained, massive sandstone tens of metres in thickness occur locally in parts of the group. Except in the latter, interbedded siltstone or silty mudstone is generally present in thin to medium beds. A basal massive siltstone unit a few metres thick at transition from underlying Moffat Shale Group. Sandstone and siltstone are typically greenish grey when fresh, pale brown weathering. Distinguished from the Gala Group to the north by the well-bedded character and relatively high proportion of interbedded mudstone. Other distinguishing factors include the younger age range, abundant garnet in coarse-grained sandstone and relatively low Sr and Ni content in whole rock sandstone composition. Distinguished from Hawick Group to the south by the common occurrence of thick to very thick beds of sandstone, abundant garnet in coarse-grained sandstone and paler, less pervasive weathering reflecting relatively low carbonate content of the sandstone.
has thickness description: Uncertain, likely to be several km.
has upper boundary definition: Faulted, none preserved.

Eastertown Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: ETS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38442
has lithology component: ETS MDST
has lithology component: ETS SLST
broader: NCB
has lower boundary definition: Conformable lower contacts with sandstones in Nairnside Sandstone Formation.
has geographical distribution: Not defined.
has lithology description: Grey and green laminated siltstones and mudstones.
has thickness description: + 50 metres.
has upper boundary definition: Conformable upper contacts with sandstones in Nairnside Sandstone Formation.

Etwall Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: ETSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38443
has lithogenesis: FLUV
has lithology component: ETSG C
has lithology component: ETSG S
has lithology component: ETSG V
has lithology component: ETSG Z
has source info: ETSG_49169
has source info: ETSG_50018
has source info: ETSG_50020
has source info: ETSG_50334
has source info: ETSG_50918
has source info: ETSG_52267
has source info: ETSG_52386
has source info: ETSG_52767
has source info: ETSG_52787
has obsolete equivalent: ETSG mn 1487
has obsolete equivalent: ETSG mn 1488
has obsolete equivalent: ETSG mn 2002
has obsolete equivalent: ETSG mn 4392
broader: TRVA
has additional age information: Middle Pleistocene (MI Stage 8). Formerly stated to be Wolstonian in the original Informal Lexicon entry by A Brandon, 26/01/1998. The chronology is based in its position above the Eggington Common Member and below the assumed Eagle Moor Member.
has lower boundary definition: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock.
has geographical distribution: Occurs as outliers on the north bank of the Trent in the Type Area (Sheet 141); thought to be present upstream, particularly on the north bank of the Dove downstream of Uttoxeter (Sheet 140) and probably elsewhere. (e.g. on the south bank of the Trent near Alrewas, Sheet 154) but the extent is uncertain pending resurvey.
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold-phase sands and gravels that underlie the Etwall Terrace. Intensely cryoturbated, decalcified poorly sorted sand and gravel, dominated by rounded pebbles of "Bunter" quartz/quartzite (typically c.80%) with subordinate subangular flint (up to c.20%), Carboniferous chert, sandstone, etc. Fragmentary terrace surface appears to be c.20m above the Trent floodplain in the type area. The upper part locally includes a rubified palaeosol (Hykeham Soil; Ipswichian). The Member is correlated with the Ockbrook Sand and Gravel Member (Trent Valley Formation) and Knighton Sand and Gravel Member (Soar Valley Formation).
has thickness description: 0 to c.3m
has upper boundary definition: Ground surface.

Etive Formation
type: Concept
in scheme: NamedRockUnit
alternative label: ETVE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JB
broader: Brent Group

Edge Hill Twelve Foot Coal (New Cumnock Area)
type: Concept
in scheme: NamedRockUnit
alternative label: ETWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: ETWC COAL
broader: LSC

Eight-Yard Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: ETYL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Eureka Coal (South Derbyshire)
type: Concept
in scheme: NamedRockUnit
alternative label: EUC
has current status: CURRENT
has theme: BEDRCK
notation: E
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EUC COAL
broader: PLCM

Eycott Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: EVG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EVG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38444
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38445
has lithology component: EVG AND
has lithology component: EVG ANDTFF
has lithology component: EVG ANLTUF
has lithology component: EVG BAANDT
has lithology component: EVG DA
has lithology component: EVG LPTUF
has lithology component: EVG PYRBRC
has lithology component: EVG RYLTUF
has lithology component: EVG VCCNG
has lithology component: EVG VCSST
has lithology component: EVG VLSS
has source info: EVG_48675
has source info: EVG_49012
has source info: EVG_49570
has source info: EVG_49802
has source info: EVG_51354
has obsolete equivalent: EVG mn 1508
has obsolete equivalent: EVG mn 4309
broader: NP
narrower: BY
narrower: OV
narrower: POG
narrower: HIF
has lower boundary definition: Taken at the base of volcanic rocks overlying mudstones of Skiddaw Group; in parts defined by base of Overwater Formation. Angular unconformity seen in some localities (Millward and Molyneux, 1992); elsewhere proved from biostratigraphical evidence from underlying Skiddaw Group.
has geographical distribution: Bothel-Binsey-Brae Fell-Caldbeck Fells; Eycott Hill; Greystoke Park (BGS 1:50k sheets 23, 24, 29); Melmerby Fell (Cross Fell Inlier) (BGS 1:50k sheet 24), Cumbria.
has lithology description: Medium-K continental-margin type basalt-andesite-rhyolite volcanic association, transtional between tholeiitic and calc-alkaline affinities. Comprises porphyritic basalt, basaltic andesite, andesite and dacite lava flows and sills with intercalated volcaniclastic deposits, comprising tuff, lapilli-tuff, breccia, conglomerate and volcaniclastic sedimentary rocks.
has thickness description: To 3200m
has upper boundary definition: Unconformity with overlying Carboniferous strata.

Ehen Valley Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: EVSG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38446
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38447
has lithology component: EVSG S
has lithology component: EVSG V
has lithology component: EVSG Z
has source info: EVSG_49654
has source info: EVSG_51342
has source info: EVSG_51754
has source info: EVSG_52129
has obsolete equivalent: EVSG mn 2883
broader: SEAG
has additional age information: Late Devensian.
has lower boundary definition: At its type site a gradational contact on to the Ehen Valley Silt Member of the Seascale Glacigenic Formation. Elsewhere it overlies either the Catgill Wood Sand and Gravel Member, which is typified by rounded cobbles of red (Permian) and yellow (Carboniferous) sandstone, or the Low Wath Till Member of the Seascale Glacigenic Formation.
has geographical distribution: On 50k Sheets 28 (Whitehaven) and 37 (Gosforth).
has lithology description: Pale yellowish brown fine- to medium-grained quartzose sand, which coarsens upwards into pebbly sand and then into gravel. Coal debris is a common component and microfaults, shears and cracks (lined with reddish brown silt and clay) are characteristic of its upper few metres. It forms part of the infill of the buried valleys of the Ehen, Calder and lower Uldale. Cross-lamination within the sand indicates that it was deposited by southward directed braided outwash streams on sandur, probably during the deglaciation of the main Late Devensian ice sheet.
has thickness description: Typically between 9.0 and 30m
has upper boundary definition: Generally unconformably overlain by diamictons of the Roythersyke Till Member of the Gosforth Glacigenic Formation.

Ehen Valley Silt Member
type: Concept
in scheme: NamedRockUnit
alternative label: EVSI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38448
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38449
has lithology component: EVSI DMTN
has lithology component: EVSI S
has lithology component: EVSI Z
has source info: EVSI_49633
has source info: EVSI_49657
has source info: EVSI_51342
has source info: EVSI_51754
has obsolete equivalent: EVSI mn 2883
broader: SEAG
has additional age information: Late Devensian.
has lower boundary definition: At its type site conformable on the Catgill Wood Sand and Gravel Member of the Seascale Glacigenic Formation, elsewhere conformable with diamictons of the Low Wath Till Member of the Seascale Glacigenic Formation.
has geographical distribution: On 50k Sheets 28 (Whitehaven) and 37 (Gosforth).
has lithology description: Very fine-grained sand, silt and clay, greyish brown to dark grey, typically fines downwards and contains much finely disseminated coal debris; generally thickly laminated. Thin diamictons present in thick silt sequences recorded in boreholes. It forms part of the infill of the buried valleys of the Ehen Calder and Lower Uldale and was laid down principally in a glaciolacustrine environment, probably during the deglaciation of the main Late Devensian ice sheet.
has thickness description: 8.7m exposed at its type section; 21.25m thick in reference section (Nirex borehole QBH 21; BGS registered borehole NY01SW 602).
has upper boundary definition: At its type site a gradational contact into the Ehen Valley Sand and Gravel Member of the Seascale Glacigenic Formation. Elsewhere it is conformably overlain by diamictons of the Rothersyke Till Member of the Gosforth Glacigenic Formation.

Ellwand Slate
type: Concept
in scheme: NamedRockUnit
alternative label: EWD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: NE

Eemian To Weichselian Diamicton, Firm To Hard (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EWDFH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BD
has lithology component: EWDFH DMTN
broader: NA

Eemian To Weichselian Gravel (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EWGRV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BD
has lithology component: EWGRV GV
has lithology component: EWGRV V
broader: NA

Earthwork Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: EWKS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: EWKS SDST
broader: Bewcastle Member
has thickness description: 8 to 12m

Eelwell Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: EWL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38450
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38451
has lithology component: EWL LMST
has source info: EWL_48851
has source info: EWL_49231
has source info: EWL_49663
has source info: EWL_52495
has source info: EWL_52562
has obsolete equivalent: EWL st 283
has obsolete equivalent: EWL mn 1924
broader: Alston Formation
has lower boundary definition: Taken at the generally conformable, sharp base of the first bed of limestone that overlies measures of the Alston Formation, typically sandstone.
has geographical distribution: Widespread limestone member within the Alston Formation, occurring throughout the Northumberland Trough in northern England and the Scottish Borders, lying stratigraphically below the Three Yard Limestone and above the Oxford Limestone. This definition incorporates its correlated unit in the Langholm and Bewcastle areas of the Scottish Border region, the Harelawhill Limestone.
has lithology description: Limestone, massive, grey, bioclastic, generally devoid of mudstone partings; typically rich in algal remains with a prominent fauna of brachiopods and corals; appreciably dolomitized in part, giving a brown-weathered and vuggy appearance.
has thickness description: 5 to 10m
has upper boundary definition: Taken at the top of the uppermost limestone bed that is overlain by a sequence of dark grey mudstones and siltstones, containing ironstone nodules locally.

Eemian To Weichselian Sand And Gravel, Interebedded (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EWMAS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BD
has lithology component: EWMAS GV
has lithology component: EWMAS S
has lithology component: EWMAS SND
has lithology component: EWMAS V
broader: NA

Eemian To Weichselian Mud, Firm To Hard (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EWMFH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BD
has lithology component: EWMFH MUD
has lithology component: EWMFH MUDM
broader: NA

Eemian To Weichselian Sand (Offshore)
type: Concept
in scheme: NamedRockUnit
alternative label: EWSND
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: BI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: BD
has lithology component: EWSND S
has lithology component: EWSND SND
broader: NA

Ewingston Sill
type: Concept
in scheme: NamedRockUnit
alternative label: EWTON
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: EWTON BSN
broader: LAFAS

Excelsior Coal (Leicestershire)
type: Concept
in scheme: NamedRockUnit
alternative label: EX
has current status: CURRENT
has theme: BEDRCK
notation: EX
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: EX COAL
broader: NE

Exeter Group
type: Concept
in scheme: NamedRockUnit
alternative label: EXE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EXG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38452
has lithology component: EXE BREC
has lithology component: EXE MDST
has lithology component: EXE SDST
has source info: EXE_49833
has source info: EXE_49847
has source info: EXE_51322
has obsolete equivalent: EXE mn 2633
has obsolete equivalent: EXE mn 2755
has obsolete equivalent: EXE mn 2664
broader: NRS
narrower: Exe Breccia Formation
narrower: MKN
narrower: HVBR
narrower: Crediton Breccia Formation
narrower: Creedy Park Sandstone Formation
narrower: WBR
narrower: WPN
narrower: YEL
narrower: Cadbury Breccia Formation
narrower: KNS
narrower: Higher Comberoy Formation
narrower: HLBR
narrower: NSBR
narrower: OBR
narrower: SHU
narrower: UPTN
narrower: Bow Breccia Formation
narrower: Alphington Breccia Formation
narrower: Dawlish Sandstone Formation
narrower: THSA
narrower: TOBR
has lower boundary definition: Basal formations in Crediton Trough (Cadbury Breccia, Upton Formation, Bow Breccia, Knowle Sandstone) rest unconformably on Bude or Crackington formations. Around and south-west of Exeter, basal formations (Dawlish Sandstone, Whipton Formation, Knowle Sandstone) rest unconformably on Crackington Formation. See definitions of component formations.
has geographical distribution: From Torbay in the south, north through Newton Abbot to Exeter; all New Red Sandstone strata in the Crediton Trough and probably the Tiverton Trough.
has lithology description: Component formations are predominantly breccia, with subordinate sandstone. All formations are alluvial fan deposits.
has thickness description: At least 700m.
has upper boundary definition: Unconformably overlain by Aylesbeare Mudstone Group.

Extensus Flags
type: Concept
in scheme: NamedRockUnit
alternative label: EXF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE

Exceat Flint
type: Concept
in scheme: NamedRockUnit
alternative label: EXFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: SECK

Exmoor Group
type: Concept
in scheme: NamedRockUnit
alternative label: EXM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38453
has lithology component: EXM CONG
has lithology component: EXM LMST
has lithology component: EXM MDST
has lithology component: EXM SDST
has lithology component: EXM SLST
has source info: EXM_48818
has source info: EXM_51484
broader: NA
narrower: Baggy Sandstones Formation
narrower: PLT
has lower boundary definition: Not seen.
has geographical distribution: North Devon and west Somerset. (SS 80 40).
has lithology description: Grey mudstones with subordinate thin- to medium-bedded siltstones, sandstones and a few limestones. The Group is punctuated by three sandstone-dominated formations. The lower two are predominantly red, purple green and grey sandstones with minor conglomerates and trace mudstones. The upper one is interbedded grey to buff sandstones, siltstones and mudstones.
has thickness description: c.7000m
has upper boundary definition: The upper boundary is taken at the incoming of hard black finely laminated unfossiliferous and silty mudstones of the Teign Valley Group (Doddiscombe Formation) above the soft mid to dark grey mudstones with scattered very thin fossiliferous limestones, siltstones and sandstones of the underlying Exmoor Group (Pilton Mudstone Formation).

Exhall Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: EXSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: EXSA CONG
has lithology component: EXSA PESST
has lithology component: EXSA SDST
has obsolete equivalent: EXSA mn 1493
broader: WIT

Elwy Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EY
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
has lithology component: EY SDST
has lithology component: EY SLMDST
has source info: EY_52509
has obsolete equivalent: EY st 289
broader: NP
has lower boundary definition: Base succeeds ribbon banded mudstones of the Nantglyn Flags Formation.
has geographical distribution: Not defined.
has lithology description: Disturbed beds, striped silty mudstones and subordinate sandstones with lateral facies changes.
has thickness description: >1750 metres.
has upper boundary definition: Unconformably overlain by Carboniferous Limestone.

80 Yard Band Coal
type: Concept
in scheme: NamedRockUnit
alternative label: EYBC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EYBC COAL
broader: PLCM

80 Yard Band Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: EYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EYC COAL
broader: PLCM
has lithology description: The Eighty Yard Band Coal is thin but widespread in its development. It is of no economic importance although it is associated with seatearth fireclay around Elland and Brighouse.

Eype Clay Member
type: Concept
in scheme: NamedRockUnit
alternative label: EYCL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EyCl
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38454
has lithology component: EYCL CALSST
has lithology component: EYCL LMST
has lithology component: EYCL SAMDST
has lithology component: EYCL SDST
has lithology component: EYCL SLMDST
has lithology component: EYCL SLST
has source info: EYCL_49903
has source info: EYCL_50995
has source info: EYCL_51182
has source info: EYCL_51418
has source info: EYCL_52641
has obsolete equivalent: EYCL mn 501
has obsolete equivalent: EYCL mn 2749
has obsolete equivalent: EYCL mn 1511
has obsolete equivalent: EYCL mn 2827
broader: Dyrham Formation
has lower boundary definition: Base of Three Tiers Sandstone. Sharp boundary on mudstone of Green Ammonite Member.
has geographical distribution: Southwest Dorset. Mapped on Sheet 327 (Bridport). Northern limit not yet proved.
has lithology description: Pale grey, micaceous, variably silty mudstone with many small siderite nodules. At base, Three Tiers Sandstone, c.7m thick, consisting of three units each 0.5 to 1m thick of very fine-grained sandstone, separated by sandy shale.
has thickness description: 60m
has upper boundary definition: Base of Starfish Bed (Downcliff Sand Member).

Eyebroughty Vent
type: Concept
in scheme: NamedRockUnit
alternative label: EYEBY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: EYEBY AGG
has lithology component: EYEBY TUF
broader: SSDLO

Eyford Member
type: Concept
in scheme: NamedRockUnit
alternative label: EYF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ey
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38456
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38457
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38455
has lithology component: EYF CAMDST
has lithology component: EYF LMST
has lithology component: EYF MDST
has lithology component: EYF SDST
has source info: EYF_48756
has source info: EYF_49459
has source info: EYF_50034
has source info: EYF_50483
has source info: EYF_50541
has source info: EYF_50680
has source info: EYF_51191
has source info: EYF_51566
has source info: EYF_52641
has obsolete equivalent: EYF mn 1083
has obsolete equivalent: EYF mn 4018
has obsolete equivalent: EYF SSL
has obsolete equivalent: EYF mn 4020
has obsolete equivalent: EYF mn 1509
broader: Fuller's Earth Formation
has lower boundary definition: Base of limestone/sandstones as described in lithology, resting on fissile mudstone of underlying un-named unit of Fuller's Earth Formation.
has geographical distribution: Chedworth area, Gloucestershire (where it passes westwards into mudstone of the Fuller's Earth), eastwards to the Burford area, Oxon (where it passes into the Charlbury Formation).
has lithology description: Pale grey, fissile, finely ooidal grainstone interbedded with grey, laminated fissile calcareous sandstone, locally decalcified to loose orange-brown sand, with minor beds of shelly and shell-fragmental limestone, marl or fissile mudstone.
has thickness description: 0 to 7m; 6 to7m in type section.
has upper boundary definition: Sharp generally erosive base of coarse-grained ooidal grainstone of Taynton Limestone Formation.

Eyam Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EYL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38459
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38461
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38458
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38460
has lithology component: EYL LMST
has lithology component: EYL MDST
has source info: EYL_49236
has source info: EYL_50516
has source info: EYL_52729
has source info: EYL_52767
has obsolete equivalent: EYL mn 145
has obsolete equivalent: EYL mn 834
has obsolete equivalent: EYL mn 1506
has obsolete equivalent: EYL mn 1507
broader: PKLM
narrower: Eyam Limestones Formation (Flat-Reef)
narrower: Eyam Limestones Formation (Knoll-Reef)
has lower boundary definition: Dark grey to grey brown basal limestone, resting upon clay or mudstone partings of the Eyam Limestone Formation, on a potholed surface above pale to medium grey limestone of the Monsal Dale Limestone Formation. Around Ashford-in-the-Water [SK 19 69], where both formations are dark grey, the boundary is taken at the top of the laminated beds of the Monsal Dale Limestone Formation.
has geographical distribution: The Peak District of the East Midlands.
has lithology description: A thinly bedded, dark grey, cherty, bioclastic limestone with fossiliferous beds of brachiopods, corals and crinoids and a few dark mudstone intercalations, which is overlain by massive pale reef limestone in the south. The reef facies occur at the base in the central and southern parts, and in the upper part in the north, and is typically a core of massive biomicrite with a distinctive brachiopod fauna, passing laterally and downward into well-bedded, coarsely crinoidal biomicrites and biosparites.
has thickness description: At Eyam Dale, 54 m thick including 30 m of reef facies; at Wardlow Mires No 2 borehole, it is 9.18 m, and contains no reef facies.
has upper boundary definition: A gradational top, marked by a transition from dark grey, bioclastic limestone or pale grey massive reef limestone of the Eyam Limestone, to dark grey, calcareous mudstone of the Widmerpool Formation.

Eyam Limestones Formation (Flat-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: EYLF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: Eyam Limestone Formation

Eyam Limestones Formation (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: EYLK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: EYLK LMST
broader: Eyam Limestone Formation

Eyemouth Vent
type: Concept
in scheme: NamedRockUnit
alternative label: EYMO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: EYMO AGG
broader: SDPV

Eynort Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EYNM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: EYNM COAL
has lithology component: EYNM FECRTE
has lithology component: EYNM FEST
has lithology component: EYNM MDST
has lithology component: EYNM SDST
has lithology component: EYNM SLST
broader: SKYL

80 Yard Rock
type: Concept
in scheme: NamedRockUnit
alternative label: EYR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: EYR SDST
has lateral equivalent: EYR st 866
has lateral equivalent: EYR GSR
broader: PLCM
has geographical distribution: West Yorkshire area.
has lithology description: The Eighty Yard Rock is a thin, fine-grained flaggy sandstone widespread throughout the West Yorkshire district.
has thickness description: Generally c.10m, locally to c.40m

Eyemouth Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: EYVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: EYVO
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38462
has lithology component: EYVO AND
has lithology component: EYVO BA
has lithology component: EYVO BAANDT
has lithology component: EYVO DA
has lithology component: EYVO FELS
has lithology component: EYVO TUF
has source info: EYVO_48966
has source info: EYVO_48967
has source info: EYVO_51673
has obsolete equivalent: EYVO mn 2565
broader: REST
has lower boundary definition: At White Heugh, south of St Abb's Head, where the lavas overlie the 'Bell Hill sediments' of the Great Conglomerate Formation and north-west of Coldingham, unconformably overlying Silurian strata.
has geographical distribution: Between Eyemouth and St Abb's Head.
has lithology description: Olivine-phyric basaltic lavas, basaltic andesites and andesites with interbeds of tuff and tuffaceous rocks, and rare dacite or rhyodacite.
has thickness description: From 500 to 600 m thick.
has upper boundary definition: The top of the basaltic to andesitic lavas, below the Auchencrow Burn Sandstone Formation.

Fachwen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fa
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: A3
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38463
has lithology component: FA CONG
has lithology component: FA SDST
has lithology component: FA SLST
has lithology component: FA TUF
has source info: FA_48863
has source info: FA_50997
has obsolete equivalent: FA mn 4273
broader: Arfon Group
has additional age information: Comley?
has lower boundary definition: Unconformity on ash-flow tuffs of the Padarn Tuff Formation (Arfon Group).
has geographical distribution: Northern Snowdonia.
has lithology description: Conglomerates, sandstones and thin volcanic tuffs at base passing up into siltstones and sandstones.
has thickness description: 40 - 50 m thick.
has upper boundary definition: Overlain conformably by mudstones of the Llanberis Slates Formation.

Farrington Member And Barren Red Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FABR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: FABR MDST
has lithology component: FABR SDST
has obsolete equivalent: FABR mn 1526
broader: NA
has lithology description: See the Lithology descriptions for the component members.

Fallowhill Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FAC COAL
broader: NE

Fluvio-Aeolian Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: FAEOL
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Aeolian Deposits

Fan Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FAG
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FAG GRAV
has lithology component: FAG SANDU
broader: NE
has lithology description: Coarse sand and gravel; deposited in an alluvial fan; bedded limestone gravel in the Moreton-in-Marsh area. [Generic description: earth science dictionaries in the BGS library].

Fairmilehead Volcanic Member
type: Concept
in scheme: NamedRockUnit
alternative label: FAI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FAI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38464
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38465
has lithology component: FAI ANDLAV
has lithology component: FAI BALAVA
has lithology component: FAI RYTUF
has lithology component: FAI TR
has source info: FAI_49223
has source info: FAI_49427
has source info: FAI_51017
has source info: FAI_51552
has source info: FAI_52986
has obsolete equivalent: FAI mn 1513
broader: PDH
has lower boundary definition: Not seen: faulted against andesite lavas of the Carnethy Volcanic Member.
has geographical distribution: Bounded on the south by the fault running parallel to the Edinburgh City bypass (NT 242 676-260 671); on the north a fault and by the overlying Braid Hills Member (NT 250 692-264 690) and on the east and west by unconformably overlying Kinneswood Formation rocks (NT 242 676-242 694 and NT 260 671-264 690).
has lithology description: A varied succession of pryroxene and hornblende andesites and biotite trachytes, with olivine basalt flows at the top, and beds of andesitic and rhyolitic tuff.
has thickness description: At least 430m: succession disrupted by faulting.
has upper boundary definition: At the possibly unconformable base of the Braid Hills Member, which is marked by an inpersistent bed of basaltic tuff between olivine basalt of the Fairmilehead Member and trachyte of the Braid Hills Member.

Fair Sandstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: FAIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has lithology component: FAIR SDST
broader: HTHE
has geographical distribution: Faroe-Shetland Basin

Farlough Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FALC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: FALC COAL
broader: NE

Farlington Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: FAMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: PCK

Farlington Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: FAMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: PCK

Fachwen Formation And Minfford Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FAMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has lithology component: FAMI AROC
has lithology component: FAMI CONG
has lithology component: FAMI SDST
has lithology component: FAMI SLST
has lithology component: FAMI TUF
broader: NE
has lithology description: See the Lithology descriptions for the component formations.

Fankerton Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FANK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lateral equivalent: FANK BLLS
broader: LLGS
has geographical distribution: Local name in the Stirlingshire area, particularly at Fankerton, near Denny.
has lithology description: Single bed of crinoidal limestone or, locally, two limestone beds separated by bluish shaly mudstone.
has thickness description: c.0.6 to 1.5m

Fanad Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: FANP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has source info: FANP_52886
broader: NE
has additional age information: Rb-Sr whole rock 402 +/- 10 Ma (O'Connor et al., 1987).
has geographical distribution: Recognised in the Republic of Ireland.

Ffernant Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FANT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38466
has lithology component: FANT BREC
has lithology component: FANT CONG
has lithology component: FANT DOLMST
has lithology component: FANT LMST
has lithology component: FANT MDST
has lithology component: FANT SDST
has lithology component: FANT SLST
has source info: FANT_49027
has source info: FANT_50795
has source info: FANT_52033
has source info: FANT_52509
has obsolete equivalent: FANT mn 305
broader: NP
has lower boundary definition: Rests unconformably on cleaved and folded Silirian rocks (Elwy Formation).
has geographical distribution: West side of the Vale of Clwyd (SH 8976) and in the Dyserth area, (SJ 0678) North Wales.
has lithology description: Red,purple and variegated silty mudstones, siltstones and sandstones with lenticular bodies of conglomerate. Breccias dominantly composed of weathered Lower Palaezoic mudstone clasts occur at base. The silty mudstones locally display glaebular calcrete profiles including abundant calcareous nodules and thin units of nodular locally dolomitised limestone. The formation records the accumulation, within palaeovalleys and embayments, of screes and alluvial sediments during the initial phases of Dinantian transgression, prior to the establishment of carbonate platform conditions of the Clwyd Limestone Group.
has thickness description: To 330m
has upper boundary definition: Sharp, erosive contact with limestones at the base of the Llanarmon Limestone Formation (Clwyd Limestone Group).

Faunal Organic Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: FAORG
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: ORGD
narrower: Diatomite
narrower: SLM

Faraday Road Member
type: Concept
in scheme: NamedRockUnit
alternative label: FAR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FarM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38467
has lithology component: FAR LMST
has lithology component: FAR TFAMST
has source info: FAR_52133
has obsolete equivalent: FAR mn 3348
broader: PYL
has lower boundary definition: Faulted out.
has geographical distribution: Plymouth area, 50k geological sheets 348/349.
has lithology description: Thin, sharp and erosively based, dark grey, commonly foetid crinoidal packstone intercalated with calcareous mudstone or argillaceous, fine-grained wackestone. In type area, 50m of grey-green, basaltic tuffaceous mudstone is present at the top.
has thickness description: Not known, part of reef deposit.
has upper boundary definition: Conformably succeeded by grey slaty calcareous mudstone of the Prince Rock Member.

Farigaig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FARG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: FARG BREC
has lithology component: FARG CONG
has lithology component: FARG FAREN
broader: INS

Far House Member
type: Concept
in scheme: NamedRockUnit
alternative label: FARH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38468
has lithology component: FARH MDST
has source info: FARH_49486
has source info: FARH_52930
has source info: FARH_52944
has obsolete equivalent: FARH GRY
broader: Browgill Formation
has lower boundary definition: At the top of the last red mudstone of the Hebblethwaite Member or (where this Member is absent) where laminated mudstone gives way to massive mudstone.
has geographical distribution: Across the Howgill Fells and Lake District.
has lithology description: Pale grey mudstone, massive.
has thickness description: About 8m in the Howgill Fells, 2-10m regionally.
has upper boundary definition: At the base of the lowest unit of thinly laminated silty mudstone of the Brathay Formation.

Farm Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FARM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FARM COAL
broader: SWLCM

Faroes Province
type: Concept
in scheme: NamedRockUnit
alternative label: FAROE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: PR
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NATIG

Faroe Plateau Basalts
type: Concept
in scheme: NamedRockUnit
alternative label: FAROP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GE
has lithology component: FAROP BA
has lateral equivalent: FAROP st 307
broader: NE
has geographical distribution: FAROE-SHETLAND BASIN

Fairlie Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FaS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38469
has lithology component: FAS SDST
has source info: FAS_50475
has source info: FAS_51673
has source info: FAS_52217
broader: SAG
has lower boundary definition: A transitional boundary drawn at the base of the white or cream sandstones of the Fairlie Sandstone Formation where it rests conformably on the red-brown sandstones of the Kelly Burn Sandstone Formation.
has geographical distribution: East of the Largs Fault Zone, Strathclyde, Scotland, sheets 29, 21, 22W.
has lithology description: White or cream, fine-grained, cross-bedded and finely laminated sandstones with beds of cross-bedded sandstone containing quartz pebbles.
has thickness description: Approximately 300 m thick.
has upper boundary definition: Drawn at the unconformity from the white or cream sandstones of the Fairlie Sandstone Formation to the lava of the Clyde Plateau Volcanic Formation, or locally the Kinnesswood Formation.

Four Ashes Sand And Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FASG
has current status: CURRENT
has theme: SPRFCL
notation: symb
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38470
has lithogenesis: GLACI
has lithology component: FASG C
has lithology component: FASG P
has lithology component: FASG S
has lithology component: FASG V
has source info: FASG_51038
has source info: FASG_51303
has source info: FASG_51440
has source info: FASG_52448
has obsolete equivalent: FASG mn 1622
has obsolete equivalent: FASG mn 1621
broader: Britannia Catchments Group
has lower boundary definition: Sharp erosional and unconformable on bedrock (Sherwood Sandstone Group).
has geographical distribution: Four Ashes, Staffordshire and the immediate surrounding area.
has lithology description: Gravel with organic-rich horizons of peat and grey, peaty clay. Gravel is dominantly well-rounded sandstone derived from the Sherwood Sandstone Group.
has thickness description: 0.45 to 4.6m
has upper boundary definition: Either the ground surface or sharp contact with lower surface of red, sandy gravelly clay of the Stockport Glacigenic Formation.

Farragon Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FAVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38471
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38472
has lithology component: FAVO AMPHB
has lithology component: FAVO HBSCH
has lithology component: FAVO MLAVA
has lithology component: FAVO MTUF
has lithology component: FAVO PSAMM
has lithology component: FAVO QZITE
has source info: FAVO_49440
has source info: FAVO_50001
has source info: FAVO_51786
has obsolete equivalent: FAVO st 308
has obsolete equivalent: FAVO FAVO
is obsolete equivalent of: FAVO FAVO
broader: Easdale Subgroup
has lower boundary definition: Base of dominantly fine-grained amphibolitic succession overlying the Ben Lawers Schist Formation.
has geographical distribution: Farragon Hill area to Glen Shee.
has lithology description: Hornblende schist, fine-grained with layers and lenses of hornblende psammite. Interfingers with the Ben Lawers Schist Formation in the east of outcrop and locally with intercalated psammite in the upper parts of the Formation.
has thickness description: Generally 200 to 300m, although thicker in the Ben Vrackie area [NN 94 63].
has upper boundary definition: Gradational boundary with Ben Lui Schist Formation located where psammite and semipelite become the dominant lithology.

Falfield Beds
type: Concept
in scheme: NamedRockUnit
alternative label: FB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NE

Fulletby Beds
type: Concept
in scheme: NamedRockUnit
alternative label: FBB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KB
has predominant age: KB
has youngest age: KB
broader: NE
has lower boundary definition: See Roach Formation.
has lithology description: See Roach Formation.
has upper boundary definition: See Roach Formation.

Fore Burn Complex
type: Concept
in scheme: NamedRockUnit
alternative label: FBC
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: FBC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38473
has lithology component: FBC IBREC
has lithology component: FBC MCDI
has lithology component: FBC TO
has source info: FBC_48961
has source info: FBC_50097
has source info: FBC_51445
has source info: FBC_52517
broader: MVMAI
has lower boundary definition: Intrusive.
has geographical distribution: Southwest Scotland.
has lithology description: A series of approximately concordant microdiorite and tonalite sheets, sills or small stocks intruded into an Early Devonian succession of lavas, tuffs and sandstones. Intrusion breccias form a series of pipes along a fault zone. The whole complex has experienced widespread tourmalinisation.
has upper boundary definition: Intrusive.

Fish Bed Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FBD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FBD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SS
has predominant age: SS
has youngest age: SS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38474
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38475
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38476
has lithology component: FBD MDST
has lithology component: FBD SDST
has lithology component: FBD SLMDST
has lithology component: FBD SLST
has source info: FBD_49807
broader: Glenbuck Group
has lower boundary definition: Base of lowest grey sandstone bed above the reddish mudstones of the underlying Dovestone Redbeds. The sandstone may be stained red or brown.
has geographical distribution: Lower Palaeozoic inlier of the Hagshaw Hills, Scotland, (50k Sheets 23W, 23E and 15W).
has lithology description: Greenish-grey silty mudstones and siltstones with interbedded fine-grained sandstone beds to 1m thick. The siltstones are laminated and have some small-scale cross-bedding.
has thickness description: 58m
has upper boundary definition: Upper surface of highest greyish-coloured sandstone or siltstone below the overlying reddish mudstones of the Gully Redbed Formation; transitional.

Fireclay Balls Ironstone (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Fireclay Balls Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: FBIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Fireach Beag Kyanite Gneiss Member
type: Concept
in scheme: NamedRockUnit
alternative label: FBKY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: NA

Friars Bay Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: FBMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: NCK

Friars Bay Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: FBMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: NCK

Friars Bay Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: FBMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
broader: NCK

Farrington Member, Barren Red Member, Radstock Member And Publow Member (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FBRP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: FBRP MDST
has lithology component: FBRP SDST
has obsolete equivalent: FBRP mn 1527
broader: Grovesend Formation

Findern Clay
type: Concept
in scheme: NamedRockUnit
alternative label: FC
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithogenesis: GLACI
has lithology component: FC CLAY
has lithology component: FC GRAV
has lithology component: FC SANDU
has lithology component: FC SILT
has source info: FC_50018
has source info: FC_52787
broader: NE
has lower boundary definition: Top of bedrock at base of Elvaston palaeochannel; Oadby Till intervenes locally.
has geographical distribution: Elvaston palaeochannel, Derbyshire.
has lithology description: Clay and silt, partly laminated, with dropstones; minor sand and gravel.
has thickness description: To 19m
has upper boundary definition: Either base of overlying river terrace sand and gravel, base of overlying Oadby Till or present day land surface.

Fireclay Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FCC COAL
broader: NE

Fireclay Coal (Birmingham)
type: Concept
in scheme: NamedRockUnit
alternative label: FCCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CW
has predominant age: CW
has youngest age: CW
has lithology component: FCCB COAL
broader: NE

Fungous Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: FCCC
has current status: CURRENT
has theme: BEDRCK
notation: F
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FCCC COAL
broader: PMCM

Foughill Complex Dolerites
type: Concept
in scheme: NamedRockUnit
alternative label: FCD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Frome Clay And Fullers Earth (Undifferentiated) [Obsolete Code: Use Fefr]
type: Concept
in scheme: NamedRockUnit
alternative label: FCFE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: FCFE MDST
has lateral equivalent: FCFE st 341
broader: NE

Fireclay Group Of Coals (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FCGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FCGC COAL
has lithology component: FCGC MDST
has lateral equivalent: FCGC st 442
broader: PLCM

Flitchity Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FCHY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: FCHY PSMG
has lithology component: FCHY PSMGN
has lithology component: FCHY QZITE
broader: Dava Succession

Flamborough Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FCk
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KS
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38477
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38478
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38479
has lithology component: FCK CAMDST
has lithology component: FCK CHLK
has source info: FCK_50586
has source info: FCK_50927
has source info: FCK_51595
has source info: FCK_52623
has source info: FCK_52668
has obsolete equivalent: FCK mn 869
has obsolete equivalent: FCK mn 1584
has obsolete equivalent: FCK mn 4348
broader: Chalk Group
has lower boundary definition: Top of highest flint band of underlying thick, flint-rich unit of chalk (ie. Burnham Formation); in type section this is the High Stacks Flint but elsewhere may be at a somewhat different horizon.
has geographical distribution: East Yorkshire and north-east Lincolnshire, Flamborough Head to Grimsby area (see Sumbler, M G, 1999, Fig.1).
has lithology description: White, well-bedded, flint-free chalk with common marl seams (typically about one per metre). Common stylolitic surfaces and pyrite nodules. Formal subdivision: None herein. Divided into three members by Whitham (1993) that are in ascending order the South Landing Member, Danes Dyke Member and the Sewerby Member. There are many named marls units of bed status.
has thickness description: Up to about 265m (onshore); basal c.160m exposed in type section.
has upper boundary definition: Base of lowest flint of succeeding thick, flint-rich unit (ie. Rowe Formation).

Fireclay Coal (Cumbria)
type: Concept
in scheme: NamedRockUnit
alternative label: FCLY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FCLY COAL
broader: PMCM

Fairy Cave Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FCM
has current status: CURRENT
has theme: BEDRCK
notation: FcM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38480
has lithology component: FCM ARLMST
has lithology component: FCM MDST
has source info: FCM_49259
broader: NE
has lower boundary definition: Sharp limestone/mudstone junction, underlain by the Pant Limestone Member.
has geographical distribution: Not defined.
has lithology description: Black argillaceous limestone and mudstone.
has thickness description: 1.7 metres.
has upper boundary definition: Sharp limestone/mudstone junction, overlain by the White Orr Limestone Member.

Finavon Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: FCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has source info: FCO_50937
has obsolete equivalent: FCO mn 1555
broader: SCN
has lower boundary definition: The Finavon Conglomerate was originally thought to conformably overlie the Melgund Formation (Armstrong and Paterson, 1970, p.14), however, it has since been determined to be a lens-shaped body within the Tannadice Sandstone Member, rendering the Melgund Sandstone Member superfluous.
has geographical distribution: The Forfar Brechin area. At Den of Dun, east-north-east of Brechin, the Finavon Conglomerate lies directly on the highest fine-grained member of the Dundee Flagstone Formation, on Sheets 57W, 57E.
has upper boundary definition: The Finavon Conglomerate Member forms a conglomeratic lens within the Tannadice Sandstone Member, which (Armstrong and Paterson, 1970, p.14) considered to be the top of a conglomerate body locally marking the base of the Tannadice Sandstone Member.

Flint Coal Rock
type: Concept
in scheme: NamedRockUnit
alternative label: FCR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FCR SDST
broader: NE

Ferricrete
type: Concept
in scheme: NamedRockUnit
alternative label: FCRET
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Duricrust

Five Clouds Sandstones
type: Concept
in scheme: NamedRockUnit
alternative label: FCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FCS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38481
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38482
has lithology component: FCS MDST
has lithology component: FCS SDST
has source info: FCS_49236
has source info: FCS_50168
has obsolete equivalent: FCS mn 1581
broader: MG
has lower boundary definition: The lower boundary is taken at the base of a thickly bedded sandstone overlying grey mudstone of undivided Millstone Grit Group in the Upper Hulme Stream Section (SK06SW/14); the precise nature of the boundary is not recorded.
has geographical distribution: Danesridge, Staffordshire [SJ 96 65] to Stanley Moor, Derbyshire [SK 04 71].
has lithology description: Sandstone, pale brown to pink, coarse-grained, thickly bedded and massive, feldspathic, with ferruginous concretions and scattered mudstone clasts, and subordinate mudstone beds.
has thickness description: At least 81.6m (the total thickness has not been proven; 81.6m is the maximum proving for the unit).
has upper boundary definition: The upper boundary is taken at the base of the first mudstone-dominated succession of undivided Millstone Grit Group overlying the Five Clouds Sandstones; the precise nature of the boundary is not recorded.

Fireclay Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FCYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FCYC COAL
broader: PLCM

Fascally Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FCYSI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
has lithology component: FCYSI SLST
broader: Brora Argillaceous Formation
has geographical distribution: Brora area, eastern Scotland.
has thickness description: c.34m

Ferder Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: FD CLAY
has lithology component: FD CLSH
has lithology component: FD SANDU
broader: NE
has lower boundary definition: Lower boundary is a marked unconformity with "channeling" up to 50 metres deep. In places erosion has removed all Quaternary material below this reflector.
has geographical distribution: Not defined.
has lithology description: Pebbly and shelly, sandy silty clay to clayey silty sand. Stiff to very stiff, possibly till. Shell fragments common at top, middle and base of unit, sand and clay partings are common. Less sandy than underlying Mariner Formation, geotechnically stronger than overlying Cape Shore Formation.
has thickness description: 50 metres. Thins to south and west. Thickens to north and east on the North Sea Plateau and may be 200 metres or more in the northern part of the Norwegian Trench.
has upper boundary definition: The upper boundary is unconformable with Holocene sand at the sea bed or apparently conformable/disconformable below the Cape Shore Formation.

Firedamp Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FDC COAL
broader: PLCM

Flaggy Delf Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FDCO
has current status: CURRENT
has theme: BEDRCK
notation: FlD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FDCO COAL
broader: PLCM

Forest Of Deer Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: FDER
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NEGRA

Findhorn Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: FDHN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
notation: FN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38483
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38484
has lithology component: FDHN DI
has lithology component: FDHN GD
has lithology component: FDHN GN
has lithology component: FDHN MCGNA
has lithology component: FDHN MZDI
has lithology component: FDHN MZGN
has source info: FDHN_49530
has obsolete equivalent: FDHN mn 1556
broader: Argyll And Northern Highlands Granitic Suite
narrower: Findhorn Pluton, Phase 1
narrower: Findhorn Pluton, Phase 2
narrower: Findhorn Pluton, Phase 3
has geographical distribution: Central and northern Monadhliath Highlands, Strath Dearn. In the Tomatin (sheet 74W) and Fortrose (sheet 84W) districts.
has lithology description: Pluton composed of 3 main facies of grey to pink-grey, medium to coarse-grained granodiorite and monzogranite, abundant enclaves of metasediment. Minor small bodies of green-grey diorite and monzodiorite. Aplitic microgranite veins.

Findhorn Pluton, Phase 1
type: Concept
in scheme: NamedRockUnit
alternative label: FDHN1
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: FDHN1 HBBGD
broader: Findhorn Pluton

Findhorn Pluton, Phase 2
type: Concept
in scheme: NamedRockUnit
alternative label: FDHN2
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: FDHN2 GDBI
broader: Findhorn Pluton

Findhorn Pluton, Phase 3
type: Concept
in scheme: NamedRockUnit
alternative label: FDHN3
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: FDHN3 MZGN
broader: Findhorn Pluton

Fordell Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: FDMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Farden Member
type: Concept
in scheme: NamedRockUnit
alternative label: FDN
has current status: CURRENT
has theme: BEDRCK
notation: FDN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38485
has lithology component: FDN SDST
has lithology component: FDN SLMDST
has source info: FDN_49247
broader: STHV
has lower boundary definition: Succeeds the largely unbedded siltstones and mudstones of the Lady Burn Formation.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Greyish-green well-bedded silty mudstones with thinly bedded greenish-black fine- to medium-grained sandstones in the upper part. Includes the 3 very fossiliferous Lady Burn Starfish beds (STFB) (A_C) near the top of the member.
has thickness description: c.40m.
has upper boundary definition: Succeeded by bluish grey soft nodular mudstones of the Cliff Member of the South Threave Formation.

Faringdon Sand Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FDNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Foel Ddu Rhyodacite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FDR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38486
has lithology component: FDR FLAVA
has lithology component: FDR FTUFF
has source info: FDR_50909
broader: LIG
has lower boundary definition: Overlies Penmaen Tuff Formation comprising lava flows and tuffs of intermediate composition, plus associated sediments.
has geographical distribution: Pwllheli area, northwest Wales.
has lithology description: Rhyodacitic lavas and tuffs.
has thickness description: <100m to >250m
has upper boundary definition: Overlain by crystal-lithic tuffs with variable characteristics, of the Carneddol Rhyolitic Tuff Formation.

Fiddler Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FDSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FDSB CAMDST
has lithology component: FDSB LMST
has lateral equivalent: FDSB DYLS
broader: LWM
has geographical distribution: Widely developed over the southeastern part of the Scottich Central Coalfield basin.
has lithology description: Interbedded calcareous shaly mudstones and impure limestones.
has thickness description: 0.15 to 0.30m

Fuller's Earth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FE
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38487
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38489
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38490
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38491
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38488
has lithology component: FE ARLMST
has lithology component: FE CALSST
has lithology component: FE CAMDST
has lithology component: FE LMST
has lithology component: FE MDST
has lithology component: FE SALMST
has lithology component: FE SHMDST
has lithology component: FE SMCCST
has source info: FE_48978
has source info: FE_49542
has source info: FE_50034
has source info: FE_50115
has source info: FE_50668
has source info: FE_50776
has source info: FE_51183
has source info: FE_51614
has source info: FE_52030
has source info: FE_52278
has source info: FE_52299
has source info: FE_52304
has source info: FE_52625
has source info: FE_52651
has obsolete equivalent: FE mn 1664
broader: Great Oolite Group
narrower: UFE
narrower: LFE
narrower: Eyford Member
narrower: Fuller's Earth Rock Member
has lower boundary definition: In the northeast Cotswolds, passage up from fine- to medium-grained ooid-grainstone of the Chipping Norton Limestone Formation (Great Oolite Group) into silicate-mudstone, or (Cotswolds to the English Channel) generally sharp, commonly non-sequential, junction between predominantly coarse-grained peloidal, ooidal and shell-fragmental limestones or (St George's Channel) calcareous sandstone of the Inferior Oolite Group overlain by silicate-mudstone.
has geographical distribution: Onshore: Dorset coast to the Burford area, Oxfordshire. Through the mid Cotswolds, the Upper Fuller's Earth passes north into various limestone formations (see e.g. Wyatt, 1996). In subcrop, widespread in the Wessex Basin. Offshore: English Channel - Celtic Sea - St George's Channel basins.
has lithology description: Silicate-mudstone, grey, bedded, variably calcareous, grading to lime-mudstone, fossiliferous, with units of thinly interbedded, more or less silici-muddy limestone (including the Fuller's Earth Rock Member, Dodington Ash Rock Member), and well-bedded sandy limestone and calcareous sandstone (including the Eyford Member and Througham Member). Where the Fuller's Earth Rock Member is present, the mudstone beds below and above are termed the Lower Fuller's Earth Member and Upper Fuller's Earth Member respectively, and parts of these may be given local names (see separate entries). The commercial fuller's earth bed occurs in the upper part of the formation in the Bath area. In the English Channel Basin the formation is predominantly mudstone with carbonaceous material at some levels and shell beds. In the St George's Channel Basin it is predominantly mudstone but includes calcareous sandstone beds.
has supplementary information: Compilers' notes: As with most units, it is difficult to define this formation in simple 'Lexicon' terms. For example it is hard to include the Fuller's Earth Rock Member but exclude the Frome Clay Formation when defining boundaries in essentially lithological terms - it all depends on context. Having said that, there is a case that the Lower and Upper Fuller's Earth[s] should be separate formations, likewise the Fuller's Earth Rock. If attempted, logically, the UFE should retain the name, as that is where the commercial fuller's earth lies, but this would mean there is no Fuller's Earth in the north Cotswolds! Regrettably there are no good exposures of this unit, and so the cited sections are boreholes (M G Sumbler 25/9/05). The offshore succession and boundaries are relatively poorly known (G K Lott, 2008).
has thickness description: 5 to over 260m (thickest in the Wessex Basin area). Offshore: generally over 100 to 300m in the English Channel (Hamblin et al., 1992) (Barton et al., 2008), up to 300m in the Celtic Sea-St George's Channel (Tappin et al., 1994).
has upper boundary definition: Generally sharp, commonly non-sequential, junction between variably calcareous silicate-mudstone, and limestones of overlying parts of Great Oolite Group: including (from Bath south to Dorset and in the English Channel) fossiliferous limestones of the Wattonensis Beds of the Frome Clay Formation, and (northeast of Bath) ooidal and shell-fragmental limestones, including the Chalfield Oolite Formation, Athelstan Oolite Formation, Taynton Limestone Formation, or fine-grained limestone of the Tresham Rock Formation.

Feal Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: FEAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DU
has lithology component: FEAL DOLR
has lithology component: FEAL GB
broader: NMVN

Fearnaght Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FEAR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: FEAR CONG
has lithology component: FEAR SDST
broader: NE

Fearn Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: FEARN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: FEARN GN
has lithology component: FEARN MCGN
has lithology component: FEARN MZGNB
has lithology component: FEARN PEG
broader: Argyll And Northern Highlands Granitic Suite

Fishburn Estheria Band
type: Concept
in scheme: NamedRockUnit
alternative label: FEB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

First Ell Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FEC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FEC COAL
has lateral equivalent: FEC st 485
broader: PMCM

Four Foot Earth Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: FEFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Fullers Earth Formation And Frome Clay Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FEFR
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has lithology component: FEFR ARLMST
has lithology component: FEFR CAMDST
has lithology component: FEFR MDST
has obsolete equivalent: FEFR mn 1653
broader: Great Oolite Group

Fen Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FEG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38492
has lithogenesis: FLUV
has lithology component: FEG CLAY
has lithology component: FEG GRAV
has lithology component: FEG SANDU
has lithology component: FEG SILT
has source info: FEG_48952
has source info: FEG_50664
has source info: FEG_51216
has source info: FEG_51292
has source info: FEG_51301
has source info: FEG_52170
has source info: FEG_52912
has obsolete equivalent: FEG mn 1531
has obsolete equivalent: FEG FEG
has obsolete equivalent: FEG mn 1535
has lateral equivalent: FEG st 560
is obsolete equivalent of: FEG FEG
is obsolete equivalent of: FEG ABSG
broader: NP
has lower boundary definition: Rests unconformably on bedrock or on older (mostly glacial) Quaternary deposits.
has geographical distribution: Exposed intermittently at the margins of Fenland in Lincolnshire, Northamptonshire, Huntingdonshire, Cambridgeshire, Suffolk and Norfolk, especially at the western and southern margins. Presumed widespread at depth within Fenland. As used, includes the distal portions of river terrace systems entering Fenland, but by implication excludes parts of the same river systems outside Fenland. It is therefore not a valid lithostratigraphical division, but seems a useful term to retain in the broad sense of Skertchly (1877).
has lithology description: Sands and gravels (including pebbly sands and sandy gravels), some clayey or silty with some silts and clays. The distal (seaward) portions include marine shells.
has thickness description: 0 to c.10m
has upper boundary definition: Contact with pebbly, silty, sandy clays and clayey sands of the Crowland Bed (Booth, 1982), or unconformably overlain by Flandrian deposits. In the absence of the Crowland Bed, the distal portions of the Fen Gravel may not be separable from the lowest Flandrian deposits.

Fells Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FEL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: FEL LMST
broader: HON
has additional age information: Within the range Asbian to Brigantian.
has geographical distribution: Eastern part of the Midland Valley.
has lithology description: Grey or locally cream limestone with spirorbids and ostracods.
has thickness description: c.0.6 to c.1.2m

False Ell Coal (Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FELC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FELC COAL
broader: PLCM

Fell Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FELL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FESD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38493
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38494
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38495
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38496
has lithology component: FELL COAL
has lithology component: FELL LMST
has lithology component: FELL MDST
has lithology component: FELL PESST
has lithology component: FELL SDST
has lithology component: FELL SEATS
has lithology component: FELL SLST
has source info: FELL_49230
has source info: FELL_49231
has source info: FELL_49411
has source info: FELL_49510
has source info: FELL_49511
has source info: FELL_50078
has source info: FELL_50716
has source info: FELL_52465
has source info: FELL_52512
has source info: FELL_52562
has source info: FELL_53020
has lateral equivalent: FELL st 573
has obsolete equivalent: FELL st 309
broader: Border Group
broader: Farne Group [Offshore]
narrower: Dumblar Rigg Sandstone
narrower: Desoglin Limestone
narrower: MORDS
narrower: OKSS
narrower: WBB
narrower: PKNS
narrower: POSD
narrower: KHB
narrower: MCSA
narrower: RASC
narrower: Gillfoot Sandstone Member
has lower boundary definition: Locally unconformable, diachronous base on range of Lower Carboniferous strata, locally defined as base of Whitberry Marine Bed [onshore areas].
has geographical distribution: Onshore limits include the Tweed Basin and northern part of the Northumberland-Solway Basin from Burnmouth, Berwickshire in the northeast to Southerness, Kirkcudbrightshire in the southwest.
has lithology description: Medium- to thick-bedded, fine- to coarse-grained cross-bedded sandstone, locally conglomeratic, with siltstone, mudstone, seatearth and locally developed thin coals and limestones [onshore areas].
has thickness description: c.530m maximum [onshore areas]
has upper boundary definition: Locally unconformable, diachronous, at base of Clattering Marine Bed, Kingsbridge Limestone or Glencartholm Volcanic Member of the Tyne Limestone Formation [onshore areas].

Felmersham Member
type: Concept
in scheme: NamedRockUnit
alternative label: FELM
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38497
has lithology component: FELM S
has lithology component: FELM V
has source info: FELM_49738
has source info: FELM_50918
has obsolete equivalent: FELM mn 1575
broader: OUSE
has lower boundary definition: Unconformable, commonly chanelled base, resting on bedrock surface.
has geographical distribution: River Great Ouse Valley, Central England.
has lithology description: Fluviatile gravel with sand.
has thickness description: 0 to 3m
has upper boundary definition: Ground surface, or at base of overlying alluvium.

Fence Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: FEN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FEN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38498
has lithology component: FEN CONG
has source info: FEN_49017
has source info: FEN_49583
has source info: FEN_49584
has obsolete equivalent: FEN mn 1536
has obsolete equivalent: FEN IC
broader: WGAT
has lower boundary definition: Sharp incoming of conglomerate belonging to the Fence Conglomerate Member above the predominantly mudstone member of the Carmichael Burn Formation
has geographical distribution: Carmichael Inlier, Lanarkshire, Scotland.
has lithology description: Greenish grey conglomerate with small, mainly igneous, but also chert and quartzite pebbles in a coarse-grained sandstone matrix.
has thickness description: c.24m
has upper boundary definition: Top of the conglomerate beds belonging to the Fence Conglomerate Member overlain by brownish grey sandstones of the Newside Arenite Member of the Westgate Formation.

Fenton Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FENC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FENC COAL
has lateral equivalent: FENC st 740
has lateral equivalent: FENC st 313
broader: PLCM

Fenland Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FEND
has current status: CURRENT
has theme: SPRFCL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QX
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38499
has lithology component: FEND C
has lithology component: FEND P
has lithology component: FEND S
has lithology component: FEND V
has lithology component: FEND Z
has source info: FEND_48952
has source info: FEND_49117
has source info: FEND_50323
has source info: FEND_51284
broader: British Coastal Deposits Group
narrower: Abbey Sand And Gravel
has lower boundary definition: Unconformable of glacial deposits and upon Jurassic and Cretaceous bedrock.
has geographical distribution: The Fens of Cambridgeshire and Lincolnshire, and continuing along the coast of Lincolnshire as far as Humberston near Cleethorpes.
has lithology description: Formation encompasses the marine, estuarine and terrestial deposits that were formed in the Fens and adjacent areas during the Holocene and previous interglacial periods. The complex includes fresh and brackish water peats, salt marsh clays, fluvial silts and fine-grained sands, marine sands, and beach-face sands and gravels. In centre of the Fen Basin, five stratigraphical units are present. In ascending order these are basal sand and gravel, the Fen Lower Peat, Barroway Drove Beds, Nordelph Peat and Terrington Beds. Barroway Drove Beds comprise intertidal soft grey clays and silty clays cut by tidal channels and creeks infilled with silt and fine-grained sand. Terrington Beds comprise marine and brackish water silts and fine-grained sands. Marine sands and gravels marginal to the Fen Basin are the Woodstone Member (silty clays and fine sands), the March Gravel Member (sandy gravel to clayey pebbly sand) and the Abbey Sand and Gravel Member (clayey, sandy gravels).
has thickness description: c.35m
has upper boundary definition: Surface.

Fenwick Limestone (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: FENL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FENL LMST
broader: SMGP

Fen Peat
type: Concept
in scheme: NamedRockUnit
alternative label: FENPT
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: PEAT

Feorlin Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FEOR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GP
broader: NE

Fuller's Earth Rock Member
type: Concept
in scheme: NamedRockUnit
alternative label: FER
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FER
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38500
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38501
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38502
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38504
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38503
has lithology component: FER ARLMST
has lithology component: FER CAMDST
has lithology component: FER LMST
has source info: FER_48762
has source info: FER_48892
has source info: FER_48894
has source info: FER_49332
has source info: FER_50340
has source info: FER_52641
has source info: FER_52790
has obsolete equivalent: FER mn 2894
has obsolete equivalent: FER mn 4185
broader: Fuller's Earth Formation
has lower boundary definition: A rapid upward transition from calcareous mudstones of the Lower Fuller's Earth Member into shelly, muddy limestone by increase of shell-detritus.
has geographical distribution: Bath area and southern Cotswolds to central Dorset.
has lithology description: Bioturbated argillaceous limestones and calcareous mudstones with an abundant Ornithellid fauna.
has thickness description: Typically 5 to 7m in North Dorset, locally 11m, thin or absent in west and south Dorset, 3 to 5m in Bath-Frome area; 5.25m in type section.
has upper boundary definition: Decrease of shell-detritus into calcareous mudstones of the Upper Fuller's Earth Member.

Fen Silt
type: Concept
in scheme: NamedRockUnit
alternative label: FES
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FES SILT
broader: NE

Freshney Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FESA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: JO
has youngest age: JO
broader: HTHE

Fells Shale
type: Concept
in scheme: NamedRockUnit
alternative label: FESH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: FESH SAPEL
broader: HON
has additional age information: Within the range Asbian to Brigantian.
has geographical distribution: West Lothian.
has lithology description: A formerly productive bed of oil-shale.
has thickness description: c.2m

Feshiebridge Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FESP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38505
has lithology component: FESP PEL
has lithology component: FESP PSAMI
has lithology component: FESP PSAMM
has lithology component: FESP SEMPEL
has source info: FESP_51186
has obsolete equivalent: FESP mn 2920
broader: Corrieyairack Subgroup
has lower boundary definition: Not interpreted to date but taken as the top of the Ord Ban Subgroup (Sheet 74E), where the semipelite, metacarbonate, calc-silicate, quartzite and amphibolite succession is overlain by interbedded psammite, semipelite and pelite belonging to the Feshiebridge Psammite Formation.
has geographical distribution: Northeast of Kingussie - Moor of Feshie
has lithology description: Graded psammite, laminated psammite and micaceous psammite with bands of semipelite to pelite. Interpreted as an originally turbiditic succession.
has thickness description: possibly 0.5 to 2km
has upper boundary definition: Incoming of the predominantly semipelite succession at the base of the Falls of Phones Semipelite Formation, above the interbedded psammite and pelite succession of the Feshiebridge Psammite Formation

Fethaland Metagabbro
type: Concept
in scheme: NamedRockUnit
alternative label: FETHG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: LD
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: FETHG MGB
broader: NMMUS

Frances Extra Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FEX
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FEX COAL
broader: NE

48 Yard Band Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FEYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FEYC COAL
has lateral equivalent: FEYC st 9
broader: NE
has geographical distribution: West Yorkshire area.
has lithology description: The Forty-eight Yard Band Coal is a thin coal of low quality, but has been worked north of Halifax.

48 Yard Rock
type: Concept
in scheme: NamedRockUnit
alternative label: FEYR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FEYR SDST
broader: PLCM
has geographical distribution: West Yorkshire area.
has lithology description: The Forty-Eight Yard Rock is a fine-grained, thinly bedded, impersistent sandstone.

Ffestiniog Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ff
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EM
has predominant age: EM
has youngest age: EM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38507
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38508
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38509
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38506
has lithology component: FF SDST
has lithology component: FF SLMDST
has lithology component: FF SLST
has source info: FF_49435
has source info: FF_50359
has source info: FF_50909
has source info: FF_51060
has source info: FF_51113
has source info: FF_51953
has source info: FF_52536
has source info: FF_52990
has obsolete equivalent: FF mn 1548
has obsolete equivalent: FF mn 2390
broader: MWG
has lower boundary definition: Conformable and transitional, with the Maentwrog Formation. Marked by change in colour from pale to dark grey in mudstones, and an increase in sandstone.
has geographical distribution: Northern, eastern and southern flanks of the Harlech Dome, North Wales.
has lithology description: Regular alternatives of quartzose siltstone and sandstone in beds up to 2m thick, interbedded with silty mudstone; abundant sedimentary structures.
has thickness description: 475 to 1020m
has upper boundary definition: Conformably overlain by mudstones of the Dolgellau Formation. Sharp contact locally.

Ferguslie Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: FFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FFC SEATM
has lateral equivalent: FFC st 150
broader: LWM

Five-Foot Coal (Tranent)
type: Concept
in scheme: NamedRockUnit
alternative label: FFCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FFCO COAL
has obsolete equivalent: FFCO mn 3198
broader: LSC

Four Feet Coal (Titterstone Clee)
type: Concept
in scheme: NamedRockUnit
alternative label: FFCTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
has lithology component: FFCTC COAL
broader: LMC

Ffairfach Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FFG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38511
has lithology component: FFG FAREN
has lithology component: FFG PESST
has lithology component: FFG RY
has lithology component: FFG RYTUF
has source info: FFG_49103
has source info: FFG_51736
has source info: FFG_52202
has source info: FFG_52375
has obsolete equivalent: FFG mn 1545
has obsolete equivalent: FFG mn 1547
has obsolete equivalent: FFG mn 1546
broader: NA
has lower boundary definition: In the type area, the formation rests upon black, micaceous, graptolitic mudstones of the Abergwilli Formation (formerly known as Didymograptus bifidus Beds). The lower boundary is taken at the incoming of beds of indurated, medium-grained arkosic sandstone, which gradually pass up into massive sandstone (Williams, 1952). The contact is not exposed, but a near complete section is preserved in railway cuttings, small quarries, and in the banks of the River Cennen just south of the village of Ffairfach (Ordovician GCR).
has geographical distribution: The Ffairfach Grits Formation principally crops out on the southern flank of the Tywi valley, south of the town of Llandeilo in Carmarthenshire. It is preserved in the hinges and on the limbs of a northeast trending series of tectonically disrupted anticlines and synclines between Golden Grove in the southwest and Rhyd-y-saint in the northeast. The Ffaifach Grits also form a thin unit exposed to the north of the Tywi in Dynefor Park.
has lithology description: The Ffairfach Grits Formation comprises massive, pink-weathering, medium- to coarse-grained arkosic sandstone with scattered, impersistent pebbly horizons with felsic tuff and rhyolite locally developed toward the top of the Formation.
has thickness description: To 160m
has upper boundary definition: The Formation is overlain by fossiliferous, buff weathering, thinly interbedded fine-grained sandstone, silty calcareous mudstone and limestone of the Llandeilo Flags Formation. The contact between the two formations is not exposed and has been argued as being disconformable (Bergstrom et al., 1987). The most intact section across the boundary is preserved in the railway cutting south of Ffairfach, which has also been taken as the type section for the Llandeilo Flags Formation itself (Rushton et al., 1999).

Four Fathom Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FFL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38512
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38513
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38514
has lithology component: FFL CHRT
has lithology component: FFL LMST
has lithology component: FFL MDST
has source info: FFL_48851
has source info: FFL_49111
has source info: FFL_49423
has source info: FFL_49425
has source info: FFL_49663
has source info: FFL_50428
has source info: FFL_50534
has source info: FFL_51279
has source info: FFL_51518
has source info: FFL_52495
has source info: FFL_52562
has obsolete equivalent: FFL mn 653
has obsolete equivalent: FFL mn 1429
has obsolete equivalent: FFL mn 1623
has obsolete equivalent: FFL mn 2496
has obsolete equivalent: FFL mn 3708
has obsolete equivalent: FFL mn 3796
has obsolete equivalent: FFL mn 4308
broader: Alston Formation
has lower boundary definition: Taken at the generally conformable, sharp base of the first bed of limestone that overlies measures of the Alston Formation. On the Alston Block, usually overlies less than 2m of dark grey seatearth mudstone and mudstone with abundant plants that overlies as a prominent sandstone referred to there as the Natrass Gill Hazle. In the Bellingham district a coal underlies the limestone.
has geographical distribution: Occurs throughout northern England and the Scottish borders, lying below the Great Limestone near the top of the Alston Formation.
has lithology description: Limestone, packstone, fine-grained, medium and dark grey, thick bedded and wavy-bedded, with few mudstone partings; somewhat argillaceous, particularly at the top. Typically contains layers of nodules and lenses of black chert. Crinoidal but not particularly fossiliferous on the Alston Block; contains conspicuous coral biostromes to the north and south of the Alston Block. Goniatites indicative of the P2c biozone have been found in mudstones above the Four Fathom Limestone in the Mount Pleasant Borehole [NZ034 152] near Barnard Castle (Johnson et al, 1962).
has thickness description: 7-10m north of the Lake District and in Northumberland; 5 to 12m on the Alston Block; about 9m on the Askrigg Block, but locally up to 25m.
has upper boundary definition: Taken at the top of the uppermost limestone bed that is overlain by a sequence of dark grey mudstones, the lowermost of which are calcareous and fossiliferous. On the Askrigg Block the limestone member is overlain by a dark grey or almost black chert referred to as the Underset Chert.

Flagstaff Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FFLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Fen Farm Limestones Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FFML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FF
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38515
has lithology component: FFML LMST
has lithology component: FFML MDST
has source info: FFML_49022
has source info: FFML_49323
has source info: FFML_50409
has source info: FFML_50484
has obsolete equivalent: FFML mn 1534
broader: Granby Member
has lower boundary definition: Change up from grey, calcareous mudstone of the undifferentiated Granby Member; at 58.14m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it passes south into part of the more argillaceous and less bioclastic Rugby Limestone Member of the Blue Lias Formation (Ambrose, 2001).
has lithology description: Group of about three thin (0.1 to 0.3m) limestone beds, separated by up to 0.5m of calcareous mudstone beds. Limestones are bioclastic packstone/grainstone, shelly, grey, weathering pale orange brown. Fauna includes bivalves, echinoderms, ammonites, corals and the trace fossil Kulindrichnus. Whole Gryphaea shells and crinoid (Pentacrinus) debis abundant on the outcrop. Forms a strong feature with a broad dip slope.
has thickness description: 1.39m in type section; up to 2m in Leicestershire.
has upper boundary definition: Change up into bluish grey, shaly mudstone of the undifferentiated Buckingham Member; at 56.75m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).

Fron Frys Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FFR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38516
has lithology component: FFR MDST
has lithology component: FFR SLST
has source info: FFR_49188
has obsolete equivalent: FFR mn 1654
broader: NP
has lower boundary definition: Overlies mudstones of the Laundry Mudstones Formation.
has geographical distribution: Central and northeast Wales.
has lithology description: Mudstones and siltstones.
has thickness description: 25m
has upper boundary definition: Overlain by pale green-grey mudstones of the Dolgau Mudstones Formation.

Ffinnant Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FFSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
broader: NA

Five Feet Coal (Leicestershire)
type: Concept
in scheme: NamedRockUnit
alternative label: FFTC
has current status: CURRENT
has theme: BEDRCK
notation: FF
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FFTC COAL
broader: NE

Foel Fras Volcanic Complex
type: Concept
in scheme: NamedRockUnit
alternative label: FFV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FFV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38517
has lithology component: FFV TRAND
has lithology component: FFV TRBA
has lithology component: FFV TUF
has source info: FFV_49974
has source info: FFV_50521
has source info: FFV_52199
broader: LLV
has lower boundary definition: Overlies mudstones of the Nant Ffrancon Subgroup and locally on the Foel Grach Basalt and Braich Tu Du Formation. Interdigitates with the Conwy Rhyolite Formation.
has geographical distribution: Foel Fras (8km west-north-west of Dolgarrog), south-west to Nant Ffrancon.
has lithology description: Trachyandesite lavas, tuffs and intrusions. Tuffs may be reworked, massive and welded, or bedded and unwelded.
has thickness description: About 1000m. Outflow much thinner, of the order 100m.
has upper boundary definition: Underlies siltstones of the Nant Ffrancon Subgroup.

Four Foot Coal (Wyre Forest)
type: Concept
in scheme: NamedRockUnit
alternative label: FFWF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FFWF COAL
broader: PMCM

Foel Grach Basalt Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FGB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FgB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38518
has lithology component: FGB BA
has lithology component: FGB VCBR
has source info: FGB_49974
has source info: FGB_50521
has source info: FGB_52199
broader: LLV
has lower boundary definition: Rests on part of the Nant Ffrancon Subgroup and locally on the Braich Tu Du Volcanic Formation.
has geographical distribution: Carnedd Llewelyn to Carnedd Dafydd.
has lithology description: Basalt and basalt breccias.
has thickness description: 400m in north; c.180m to the south.
has upper boundary definition: Overlain by outflow of the Foel Fras Volcanic Complex and by part of the Nant Ffrancon Subgroup.

Foughill Complex Granophyres
type: Concept
in scheme: NamedRockUnit
alternative label: FGCG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Fluvioglacial Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: FGD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FGD CLAY
has lithology component: FGD GRAV
has lithology component: FGD PEAT
has lithology component: FGD SANDU
has lithology component: FGD SILT
broader: NE
has lithology description: Gravel, sand, silt, clay or peat, bedded or chaotic; of glaciofluvial origin. [Generic description].

Fluvioglacial Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FGG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FGG GRAV
has lithology component: FGG SANDU
broader: NE
has lithology description: Sand and gravel, locally with silt and clay lenses, of glaciofluvial origin. [Generic description].

Foel Gron Granophyric Microgranite
type: Concept
in scheme: NamedRockUnit
alternative label: FGGM
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: FGGM MCGN
has source info: FGGM_50909
broader: NAN
has lower boundary definition: Not seen.
has lithology description: Fine-grained aplitic microgranite.
has thickness description: Unknown.
has upper boundary definition: Not seen.

Fogger Reef Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: FGL BREC
has lithology component: FGL CONG
has lithology component: FGL LMST
has source info: FGL_50498
broader: HOM
has geographical distribution: Local to the area around Fogger (Fogga) near Bell Busk, Yorkshire.
has lithology description: Poorly bedded porcellanous and "tuffaceous"-appearing limestones with associated contemoraneous breccias/conglomerates.

Forge Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: FGS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FGS SDST
broader: MCMS
has geographical distribution: The Coatbridge - Baillieston district, east of Glasgow.
has thickness description: c.17m

Fresgoe Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FGSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DI
has predominant age: DI
has youngest age: DI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38520
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38521
has lithology component: FGSA SDST
has lithology component: FGSA SISST
has source info: FGSA_49627
has source info: FGSA_50216
has source info: FGSA_50493
has source info: FGSA_50645
has source info: FGSA_51534
has obsolete equivalent: FGSA mn 1641
has obsolete equivalent: FGSA mn 1642
broader: Bighouse Formation
has lower boundary definition: Overlies a thinly interbedded, sandstone-dominated rhythmic sequence of sandstones, siltstones and laminated carbonate mudstones (fish beds) of the Bighouse Formation.
has geographical distribution: Onshore and immediate offshore of the Dounreay area, Caithness, northern Scotland.
has lithology description: A thickly bedded, cross-stratified, pale grey to pale yellow, medium-grained sandstone. The unit represents the first thick sandstone in a generally more thinly-bedded sequence. It is consequently a mappable unit. It is a notable reflector in seismic sections and a marker horizon in borehole cores, marking the top of the Bighouse Formation in the Dounreay area.
has thickness description: 32m
has upper boundary definition: The base of the overlying Sandside Bay Formation, which displays a cyclic depositional sequence dominated by sandstones, with thicker well-developed carbonate laminated mudstones (fish beds).

Ffridd Graig-Wen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FGW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
broader: NE

Forth Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QF
has lithology component: FH CLAY
has lithology component: FH SANDU
has source info: FH_51066
has obsolete equivalent: FH mn 1617
broader: NE
narrower: St Andrews Bay Member
narrower: Fitzroy Member
narrower: Largo Bay Member
narrower: Whitethorn Member
has lower boundary definition: In the Tay-Forth area (1:250,000 Sheet 56 deg. north, 4 deg. west) the Forth Formation generally rests unconformably on the St Abbs/Wee Bankie Formations or rockhead. Locally it may rest conformably on the St Abbs Formation. Further east in the Marr Bank/Devil's Hole areas (56 deg. north, 2 deg. west, + 56 deg.) the unit may form an infill to deep erosive channels hence resting unconformably on the pre-existing sediments.
has geographical distribution: Not defined.
has lithology description: Varies from muds and silty muds to sands and gravelly sands. The former muddy lithologies tend to occur mainly in the lower part of the sequence. NOTE: In this area (56 deg north, 3 deg west + 56 deg north, 4 deg west) it has been possible to subdivide the formation into two members (see attached sheets). Unfortunately, although this unit can be extended over a wide area of the west central North Sea, it has not beeen possible to subdivide the unit elsewhere without present knowledge.
has thickness description: Varies from < 5 metres - 60 metres.
has upper boundary definition: Top of unit is unconformably overlain by seabed sediments.

St Andrews Bay Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: FHA CLAY
has lithology component: FHA SANDU
has lithology component: FHA SILT
has source info: FHA_51979
broader: Forth Formation
has lower boundary definition: Base of unit unconformably overlies all pre-existing sediments.
has geographical distribution: Not defined.
has lithology description: Varies from pebbly muddy sands, and silty muds to interlaminated silts and muds.
has thickness description: c.23 metres.
has upper boundary definition: Top of unit unconformably overlain by seabed sediments.

Fitzroy Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHF
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: FHF CLAY
has source info: FHF_52786
broader: Forth Formation
has lower boundary definition: Basal erosion surface dissects most quaternary formations in the area.
has geographical distribution: Not defined.
has lithology description: Soft clay and silty clay often with black sulphide laminae and dropstones: significantly less consolidated than underlying sediments.
has thickness description: 49.5 metres - variable - as the infill of erosive features.
has upper boundary definition: Upper surface is irregular, overlain by Whitehorn Member of the Forth Formation.

Flathill Flint
type: Concept
in scheme: NamedRockUnit
alternative label: FHFL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
broader: SECK

Largo Bay Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: FHG CLAY
has lithology component: FHG SILT
has source info: FHG_51979
has lateral equivalent: FHG st 615
broader: Forth Formation
has lower boundary definition: Generally rests unconformably on the St Abbs Formation although locally it may be conformable.
has geographical distribution: Not defined.
has lithology description: Interbedded, soft to firm, grey muds and silty muds, and dark grey-brown silts, with rare small pebbles.
has thickness description: c.16 metres.
has upper boundary definition: Top of unit has been eroded and these sediments are unconformably overlain by the St Andrew's Bay Member.

Froghall Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: FHI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FHI FEST
has obsolete equivalent: FHI mn 1651
has obsolete equivalent: FHI mn 1652
broader: PLCM
has geographical distribution: Restricted to the Cheadle Coalfield.
has thickness description: c.0.55m

Flat Holm Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38522
has lithology component: FHL DSLST
has lithology component: FHL DSMDST
has lithology component: FHL LMST
has lithology component: FHL MDST
has source info: FHL_49477
broader: HTL
has lower boundary definition: Taken at the sharp erosive contact of the massive to thick-bedded pale grey skeletal and ooidal limestones of the Flatholm Limestone Member and the thin- to medium-bedded dolomite and calcite mudstones and mudstones of the underlying Caswell Bay Mudstone Formation.
has geographical distribution: Flat Holm Island [ST 22 64], South Wales.
has lithology description: Dark grey, medium-bedded skeletal limestones with thick-bedded, locally cross-bedded, commonly ooidal limestones at base. Units of interbedded dolomite mudstone, dolomite siltstone and mudstone punctuate the succession. Deposited as a transgressive barrier and offshore shelf sequence.
has thickness description: 31m
has upper boundary definition: Taken at the top of the uppermost unit of the interbedded dolomite mudstone, dolomite siltstone and mudstone of the Member, which is overlain by massive to thick-bedded pale grey skeletal and ooidal limestones of the remaining part of the High Tor Limestone Formation.

Fourth Hosie Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FHLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has lithology component: FHLS LMST
has source info: FHLS_51867
broader: LLGS

Faraday House Shell Bed Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: FHMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FHMB LMST
has lithology component: FHMB SDST
broader: MG

Fernham Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHMS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/K
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/K
broader: NE

Falhouse Rock
type: Concept
in scheme: NamedRockUnit
alternative label: FHR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FHR MDST
has lithology component: FHR SDST
has lateral equivalent: FHR SR
broader: PLCM
has geographical distribution: West Yorkshire area [Falhouse, Lower Whitley, Yorkshire].
has lithology description: The Falhouse Rock is a fine-grained, thinly bedded sandstone that forms a number of leaves interbedded with mudstone.
has thickness description: To c.20m, commonly less.

Fair Head Sill
type: Concept
in scheme: NamedRockUnit
alternative label: FHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Whitethorn Member
type: Concept
in scheme: NamedRockUnit
alternative label: FHW
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: FHW SANDU
has lithology component: FHW SNSH
has source info: FHW_52786
broader: Forth Formation
has lower boundary definition: Overlies Fitzroy Member of the Forth Formation on irregular erosive surface.
has geographical distribution: Not defined.
has lithology description: Very fine-grained lithic sand with shell fragments.
has thickness description: 11m - reaches up to 30m in deeper features.
has upper boundary definition: Occasionally overlies pre-Forth Formation sediments.

Fourth Waterloo Coal (Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FHWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FHWC COAL
broader: PMCM

Frodingham Ironstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has lithology component: FI AROC
has lithology component: FI LMST
broader: SMD

Fittleworth Member
type: Concept
in scheme: NamedRockUnit
alternative label: FIB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FiB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38523
has lithology component: FIB CLAY
has lithology component: FIB SANDU
has source info: FIB_49408
has source info: FIB_51157
has source info: FIB_51916
broader: SAB
narrower: UFIB
narrower: LFIB
has lower boundary definition: Incoming of conspicuous clay-rich sands and clays at top of fine-grained to medium-grained 'Bargate Beds' (now Easebourne Member) where present.
has geographical distribution: From Stedham, West Sussex [SU 86 22] (where the combined Fittleworth Member and Selham Ironshot Sands Member are replaced by the Rogate Member) and probably eastwards to Heath Common (TQ 11 14).
has lithology description: Glauconitic sandy clays and clayey sands: orange-brown where weathered; bright green where not. From Stedham, West Sussex (SU 6 22) to east of Selham, West Sussex (SU 94 20), about 9km, the Fittleworth Member is divided by the Selham Ironshot Sands Member. Samuel (1994) proposed that the upper division (c.2m thick) be named the 'Upper Fittleworth Member', with a corresponding lower division (to c.8m thick), here named the 'Lower Fittleworth Member' (see separate Lexicon entries for these units).
has thickness description: 10-60m
has upper boundary definition: From Stedham to Storrington, incoming of fine-grained well-sorted sands of Pulborough Sandrock; from Storrington eastwards, incoming of silty clay of Marehill Clay Member.

Fibua Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FIBU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fib
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: SU
has youngest age: SU
broader: NP

Finnarts Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: FIC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FIC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38524
has lithology component: FIC CONG
has lithology component: FIC SDST
has lithology component: FIC WACKE
has source info: FIC_50463
has source info: FIC_52489
broader: Corsewall Formation
has lower boundary definition: Lowermost occurrence of pebbles or cobbles in greywackes.
has geographical distribution: Not defined.
has lithology description: Two lenticular bodies of mainly coarse greywackes with pebbles, cobbles and boulders.
has thickness description: 200m
has upper boundary definition: Uppermost occurrence of pebbles, cobbles or boulders in mainly coarse greywacke sequence.

Fionn Choire Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FICH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: FICH TR
has lithology component: FICH TRTUF
broader: SKYL

Firth Coal Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FICO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
broader: NE

Findlater Castle Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: FICQ
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FiCQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38525
has lithology component: FICQ QZITE
has source info: FICQ_48670
has source info: FICQ_49235
has source info: FICQ_50001
has source info: FICQ_51142
has obsolete equivalent: FICQ mn 1558
broader: Findlater Flag Formation
has lower boundary definition: Sharp change from thinly-banded psammite and semipelite to thick-bedded quartzite.
has geographical distribution: From coast at Findlater Castle [NJ 5425 6730], as far inland as the A98 road [NJ 531 667]; quartzite units within the Findlater Flag Formation to the southwest of the A98 cannot with confidence be correlated with the Findlater Castle Quartzite Member.
has lithology description: Quartzite, cross-bedded, granular, white; large-scale ripple marks prominent.
has thickness description: c.7m on coast section; possibly 10 to 20m inland.
has upper boundary definition: Top of highest quartzite bed; overlain by flaggy thin-bedded psammite and semipelite.

Fidra Sill
type: Concept
in scheme: NamedRockUnit
alternative label: FIDRA
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: FIDRA BAOM
broader: LAFAS

Findlater Flag Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FIFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38526
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38527
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38528
has lithology component: FIFL PSAMM
has lithology component: FIFL QZITE
has lithology component: FIFL SCH
has lithology component: FIFL SEMPEL
has lithology component: FIFL SPFLG
has source info: FIFL_48670
has source info: FIFL_49235
has source info: FIFL_50436
has obsolete equivalent: FIFL mn 1559
broader: Lochaber Subgroup
narrower: WESD
narrower: Findlater Castle Quartzite Member
has lower boundary definition: Base of thinly bedded, flaggy psammites and semipelites above massive or thick-bedded quartzites of the Grampian Group (eg Cullen Quartzite Formation).
has geographical distribution: 1) Newmill (Sheet 85E) and Drybridge (Sheet 95) to coast between Logie Head and Crathie Point (Sheet 96). 2) Core of Ardonald Anticline from SW of Jock's Hill (Sheet 85E) to Ardonald (Sheet 86W). 3) From Rothes Fault at Maggie Knockater to Burn of Mulben (Sheet 85E).
has lithology description: Mainly thinly banded, flaggy, micaceous psammite and semipelite with more dominant semipelite locally.
has thickness description: c. 1350m on coast section; over 400m inland.
has upper boundary definition: Top of non-calcareous flaggy psammites and semipelites that pass upwards into banded calcareous flags of the Pitlurg, Cairnfield or Foddsletter Formations, depending upon locality.

Findon Group
type: Concept
in scheme: NamedRockUnit
alternative label: FIG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38529
has lithology component: FIG CLAY
has lithology component: FIG CONG
has source info: FIG_49235
broader: NE
has lower boundary definition: Drawn at the base of the Findon Group where conglomerate rests conformably upon marl of the Crovie Group.
has geographical distribution: Gamrie parish, Grampian region.
has lithology description: Coarse conglomerate with a seam of red clay containing fossil fish.
has thickness description: 24 metres.
has upper boundary definition: Drawn at the conformable upward passage of the Findon Group from conglomerate and breccia overlain by superficial deposits.

Finsbury Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: FIGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QO
has predominant age: QO
has youngest age: QO
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38530
has lithogenesis: FLUV
has lithology component: FIGR C
has lithology component: FIGR S
has lithology component: FIGR V
has source info: FIGR_51453
has obsolete equivalent: FIGR mn 1561
has obsolete equivalent: FIGR mn 4142
broader: MNHD
has lower boundary definition: Rests unconformably on bedrock geology (London Clay).
has geographical distribution: Thames Valley and associated tributaries.
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].
has thickness description: 1-3m.
has upper boundary definition: At surface.

Fair Isle Group
type: Concept
in scheme: NamedRockUnit
alternative label: FIL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DV
broader: ORS
narrower: SAF
narrower: WAF
narrower: WAG
narrower: OBG
narrower: VAG
narrower: Bu Ness Sandstone Formation

Fintona Group
type: Concept
in scheme: NamedRockUnit
alternative label: FIN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38531
has lithology component: FIN CONG
has lithology component: FIN MDST
has lithology component: FIN SDST
has lithology component: FIN SLST
has lithology component: FIN VLSS
has source info: FIN_51339
has source info: FIN_52293
has source info: FIN_53027
has source info: FIN_53063
has obsolete equivalent: FIN mn 1562
has obsolete equivalent: FIN mn 1262
is obsolete equivalent of: FIN SHAN
is obsolete equivalent of: FIN KILS
broader: NE
narrower: SHAN
narrower: Gortfinbar Conglomerate Formation
narrower: TEDD
narrower: RSF
has lower boundary definition: Unconformable in the northeast and east on the early Caledonian Tyrone Igneous Complex and the Lower Silurian at Pomeroy. Elsewhere in Fintona Block the contact is faulted.
has geographical distribution: The Fintona Block, Northern Ireland.
has lithology description: Clastic sediment, red-bed conglomerates, sandstones, siltstones and mudstones; contemporaneous acid volcanic rocks in the lower levels.
has thickness description: Difficult to gauge owing to lack of a distinctive lithostratigraphy. Estimated unreliably as c.3000m in east outcrop (1:50,000 Sheet 34, Pomeroy).
has upper boundary definition: Either not exposed and faulted out, or overlain unconformably by Lower Carboniferous basal clastics and Visean marine sediments on the south side of the Fintona Block.

Fourteen-Inch Coal (Glasgow Area; Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: FINC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FINC COAL
broader: LSC

Findhorn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FIND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: RLG
narrower: UFSA
narrower: LFSA
narrower: Findhorn Siltstone Unit

Findon Fish Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FINF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
is obsolete equivalent of: FINF GDC
broader: Gardenstown Conglomerate Formation

Findochty Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: FINQ
has current status: CURRENT
has theme: BEDRCK
notation: FinQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38532
has lithology component: FINQ PSAMM
has lithology component: FINQ QZITE
has lithology component: FINQ SEMPEL
has source info: FINQ_48670
has source info: FINQ_49235
has source info: FINQ_50001
has source info: FINQ_50436
has source info: FINQ_51142
has obsolete equivalent: FINQ mn 1560
broader: Cullen Quartzite Formation
has lower boundary definition: Not seen; covered by unconformably overlying Devonian rocks.
has geographical distribution: Along coast section from Buckpool, Buckie [NJ 413 656] to Toshie's Long Craigs [NJ 4970 6835]; cannot be differentiated inland.
has lithology description: Quartzite, thickly- to very thickly-bedded, rarely pebbly, cross-bedding well-developed. Contains thin beds of muscovite-rich and garnetiferous biotitc semipelite.
has thickness description: c.1200m on coast section; cannot be distinguished separately inland.
has upper boundary definition: Fairly sharp change to medium- to thin-bedded quartzite of Logie Head Quartzite Member.

Finglack Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FINT
has current status: CURRENT
has theme: SPRFCL
notation: FinT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38533
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38534
has lithology component: FINT DMTN
has source info: FINT_48667
has source info: FINT_50803
has source info: FINT_50861
has source info: FINT_50940
has source info: FINT_52812
has obsolete equivalent: FINT BOC
broader: INVG
narrower: Balmakeith Till Member
narrower: Baddock Till Member
has lower boundary definition: Sharp, unconformable, glacitectonic contact with Clava Shelly Formation or with bedrock.
has geographical distribution: Sheet 84W (Fortrose)
has lithology description: Stiff stony sandy clay diamicton (Lodgement Till), predominantly sandstone clasts.
has thickness description: 8m or more
has upper boundary definition: Sharp contact with glaciofluvial sheet deposits, ice contact deposits or moundy glacial deposits.

Finery Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FINY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FINY COAL
has lateral equivalent: FINY st 858
broader: SWMCM

Five Quarters Coal ( Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FIQC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FIQC COAL
broader: NE

Five Quarters Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FIQW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CB
has lithology component: FIQW COAL
broader: NE

Fiery Delf (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FIRD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: FIRD COAL
broader: NE

Fiery Coal (In South Wales Middle Coal Measures Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: FIRY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FIRY COAL
broader: SWMCM

Fisher Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FIS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FIS CLAY
has lithology component: FIS SANDU
has lithology component: FIS SILT
has source info: FIS_49258
has obsolete equivalent: FIS mn 1578
broader: NE
has lower boundary definition: Basal surface is planar overlying Ling Bank Formation.
has geographical distribution: Not defined.
has lithology description: Very stiff overconsolidated clay, silt and shelly sand. Clay is generally sandy with pebbles of varying origin including chalk.
has thickness description: 39.5 metres, varies between ca 50 metres and absent where totally eroded.
has upper boundary definition: Upper surface is irregular, eroded by pre-Forth and Coal Pit Formation erosive phases.

Findhorn Siltstone Unit
type: Concept
in scheme: NamedRockUnit
alternative label: FISI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: Findhorn Formation

Fiskavaig Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FISK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: FISK BA
has lithology component: FISK HAW
has lithology component: FISK MUG
broader: SKYL

Fishguard Volcanic Group
type: Concept
in scheme: NamedRockUnit
alternative label: FIV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38535
has lithology component: FIV BA
has lithology component: FIV DA
has lithology component: FIV LAVA
has lithology component: FIV RY
has lithology component: FIV TUF
has lithology component: FIV VCBR
has lithology component: FIV VLSS
has source info: FIV_48750
has source info: FIV_49883
has source info: FIV_50633
has source info: FIV_53012
has obsolete equivalent: FIV mn 1579
has obsolete equivalent: FIV mn 1580
broader: NE
narrower: PMV
narrower: SHV
narrower: LVG
narrower: Goodwick Volcanic Formation
has lower boundary definition: Drawn at base of rhyolitic and dacitic lavas of the Porth Maen Melyn Volcanic Formation where it rests conformably on dark mudstones of the Aber Mawr Shale Formation.
has geographical distribution: South-west Wales.
has lithology description: Rhyolitic and dacitic lavas, basaltic pillow lavas. Spilitic breccias, acid tuffs and intercalated volcaniclastic sediments. (Correlative of Fishguard Volcanic Group-Llanrian Volcanic Group.
has thickness description: Approx. 1800 metres.
has upper boundary definition: Drawn at conformable upward passage from rhyolitic lavas of the Goodwick Volcanic Formation to dark grey mudstones of the Caerhys Shale.

Fjerritslev Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FJEV
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JS
broader: NE

Fork Vein Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FKVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has lithology component: FKVC COAL
broader: NE

Freeland Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: FL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38536
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38537
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38538
has lithogenesis: FLUV
has lithology component: FL C
has lithology component: FL S
has lithology component: FL V
has lithology component: FL Z
has source info: FL_48752
has source info: FL_49130
has source info: FL_49677
has source info: FL_50263
has source info: FL_50264
has source info: FL_50265
has source info: FL_50476
has source info: FL_50661
has source info: FL_50874
has source info: FL_50918
has source info: FL_51363
has source info: FL_51515
has source info: FL_51832
has source info: FL_51838
has source info: FL_51966
has source info: FL_51969
has source info: FL_52070
has source info: FL_52086
has source info: FL_52312
has source info: FL_52547
has obsolete equivalent: FL mn 1639
has obsolete equivalent: FL GSG
has obsolete equivalent: FL mn 3336
has obsolete equivalent: FL mn 4305
has obsolete equivalent: FL mn 1638
has obsolete equivalent: FL mn 3086
has obsolete equivalent: FL SGUO
broader: TV
has additional age information: Mid Pleistocene (MI Stage 12).
has lower boundary definition: Unconformable, commonly channelled base, resting on Jurassic bedrock or (locally near head of River Evenlode) on Quaternary Wolston Formation.
has geographical distribution: Upper Thames catchment, ie, River Thames and most tributaries (excluding River Thame, where named equivalents occur) upstream of the Goring Gap. Well-developed in lower Evenlode around the type locality, with sporadic outliers along the course of the Thames elsewhere, particularly in the Nuneham Courtney area [SU 54 97].
has lithogenesis description: River Terrace Deposits.
has lithology description: Predominantly cold phase sands and gravels that underlie the Freeland Terrace. Dominated by clasts of "Bunter" quartz/quartzite, typically with sporadic ironstone and rare flint, in a sandy loam matrix. Limestone clasts are generally rare probably because of pervasive decalcification. Near Oxford [SP515 014] [probable] equivalents [probably] overlie the organic Sugworth Beds, thought from palaeontology to be "Cromerian" (MIS 13+).
has supplementary information: (A) The unit is referred to here as Freeland Sand and Gravel Member though in Bowen (1999), and in previous BGS use, it was simply Freeland Member. (B) Following the "traditional" view, this unit was placed in the Northern Drift Formation by Bowen, 1999 (i.e. (?)Kesgrave Formation of the current scheme). However, Sumbler (2001) showed that it is the oldest unit of the [Upper] Thames Valley Formation. In fact few would dispute this because, even before 2001, this was generally accepted (e.g. Hey, 1986; Whiteman, 1992; Bridgland, 1994; in fact most except Gibbard) as the correlative of the Black Park of the Middle Thames. As this is essentially an Anglian outwash terrace, even then it was accepted implicitly that the Freeland postdated the truncation of the extended proto-Thames ?Northern Drift or Kesgrave River?. (C) Terrace surface is some 40m above modern (Evenlode) alluvial floodplain at the type locality, diminishing somewhat upstream. (D) The upper boundary is given as ?ground surface? though head, colluvium or soil deposits may intervene. (E) Apart from at the type locality, recognition of this terrace is based on elevation, and in some areas (notably on Sheet 236, 253 and 254) the mapping is suspect. Prior to Sumbler 2001, the outcrops now recognized in the Upper Evenlode (Sheet 235, 218) were included in ?Moreton Drift? and there is indeed a component of glaciofluvial outwash there.
has thickness description: 0 to c.4m, typically <2m
has upper boundary definition: Ground surface.

Flatt Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FLA COAL
broader: NE

Fladdabister Limestone (?Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: FLAD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: FLAD MLMST
broader: Quarff Succession And Melange
has lithology description: The subdivisions of the Quarff Succession and Melange are tectonic units consisting of Dalradian metasedimentary rocks that cannot be allocated to one of the main groups.

Fletcher Bank Grit
type: Concept
in scheme: NamedRockUnit
alternative label: FLB
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38540
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38539
has lithology component: FLB MDST
has lithology component: FLB PESST
has lithology component: FLB SDST
has source info: FLB_52618
has obsolete equivalent: FLB GGT
has obsolete equivalent: FLB mn 3539
has lateral equivalent: FLB MGG
has obsolete equivalent: FLB mn 2721
broader: MARSD
has lower boundary definition: The lower boundary is taken in the Fletcher Bank Borehole at the base of a sandstone dominated sequence overlying a mudstone-dominated succession of the Millstone Grit Group.
has geographical distribution: Southern Pennines, Manchester [SJ 8398] to Clitheroe [SD 7441], west of the Pennine Anticline. Appears with several codesused on the same mapsheet as: E68, GG RV; E75, FB Rv; E76, Rv FB GG, E85, GG.
has lithology description: Sandstone and pebbly sandstone, coarse-grained with angular grains, with quartz and quartzite pebbles, massive and current-bedded, and subordinate beds of mudstone and coal.
has thickness description: 110.97 m is the maximum measured thickness [SD81SW/3], allthough the bottom was not proved.
has upper boundary definition: The upper boundary is taken at the base of a mudstone-dominated succession overlying sandstones of the Fletcher Bank Grit; often coincident with the base of an unnamed coal.

Flex Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: FLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FLC COAL
broader: LSC

Field Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FLDC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: FLDC COAL
broader: RA

Fluvial Diatomite
type: Concept
in scheme: NamedRockUnit
alternative label: FLDI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Diatomite
has lithology description: Soft siliceous deposit, consisting mainly of opaline diatom frustules; of fluvial origin. [Generic description: 'TMOS' Procedures].

Fladen Group
type: Concept
in scheme: NamedRockUnit
alternative label: FLDN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JO
broader: NE
narrower: Beatrice Formation
narrower: HUGI
narrower: PNTL
narrower: Brora Coal Formation

Fleetwood Dyke Group
type: Concept
in scheme: NamedRockUnit
alternative label: FLDY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Flett Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLET
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GE
broader: MORA
narrower: Colsay Sandstone Member
narrower: HIYS

Flags Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FLG CLAY
has lithology component: FLG SANDU
broader: NE
has lower boundary definition: Upper limit : seabed.
has geographical distribution: Not defined.
has lithology description: Very soft, soft to firm sandy/silty clays or muddy sands often laminated, usually olive to dark grey and containing sulphides. The laminae show coarsening upwards sequences. Pockmarks identified on seismic records in some areas.
has thickness description: 3.4 metres +. Up to 15 metres on seismic sections.
has upper boundary definition: Lower limit : Ferder, Mariner and Shackleton Formation beneath an unconformity which may be ice scoured.

Fleming Hall Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FlH
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38541
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38542
has lithology component: FLH ANDTFF
has lithology component: FLH BREC
has lithology component: FLH LPTUF
has lithology component: FLH VCSST
has source info: FLH_52126
has source info: FLH_53019
has obsolete equivalent: FLH mn 1588
broader: Borrowdale Volcanic Group
narrower: SIFA
narrower: LOFA
narrower: TOEF
has lower boundary definition: Taken at the base of the sequence of homogeneous, thick, generally lithic - poorly welded tuffs, above the Brown Bank Ignimbrite Formation, which is composed of thinner sheets of lithic-rich andesite and rhyolitic lapilli tuff. Locally a coarse lithic-rich lag-breccia occurs at the base of the lowest member.
has geographical distribution: Crops out east of Gosforth, Cumbria, as far as the Thistleton Fault (Lake District Boundary Fault). Also proved in Sellafield boreholes 2 (NY 00SE/28), 4 (NY00SE/29), 5 (NY00SE/30), 10A (NY00SW/38), 11A (NY00SE/34), 12A (NY00SW/39); RCF1 (NY00SE/35), RCF2 (NY00SE/36), RCF3 (NY00SE/37), RCM3 (NY00SE/39), PRZ1 (NY00SE/45), PRZ2 (NY00SE/44) and PRZ3 (NY00SE/42).
has lithology description: Andesitic tuff and lapilli-tuff (eutaxitic to parataxitic). At least three welded ignimbrite sheets, locally separated by thin beds of sandstone. Side Farm Member comprises poorly sorted beds of lapilli-tuff and pyroclastic breccia.
has thickness description: 403m in type section; 506m in Sellafield BH No.4 (NY00SE/29). Thicknesses are incomplete and uncorrected for dip, as boreholes deviated from vertical.
has upper boundary definition: Not seen, but mapped at the change from densely welded tuff to a mixed sequence of lithic-rich tuff and parataxitic tuff of the Loweray Formation.

Fourlaws Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FLL LMST
has source info: FLL_51867
has lateral equivalent: FLL st 420
broader: TYLS
has geographical distribution: Northumberland; type area around Fourlaws.
has lithology description: Crinoidal limestone.
has thickness description: c.3.5m

Foel Formation, Llanarmon Formation And Loggerheads Limestone Formation (Undifferentiated) (Knoll-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: FLLK
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: FLLK LMST
broader: NA

Foel Formation, Llanarmon Formation And Loggerheads Limestone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FLLL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: FLLL LMST
broader: NA

Fletcher Bank Grit And Midgley Grit (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FLMI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
broader: MG

Flanders Moss Peat Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLMP
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38543
has lithology component: FLMP C
has lithology component: FLMP P
has lithology component: FLMP S
has lithology component: FLMP Z
has source info: FLMP_49343
has source info: FLMP_49745
has source info: FLMP_50605
has source info: FLMP_51395
has source info: FLMP_51774
has source info: FLMP_52288
has obsolete equivalent: FLMP mn 4055
broader: Britannia Catchments Group
has lower boundary definition: Unconformable base on various local members of the Forth Clay Formation, Wilderness Till Formation (Main Late Devensian) and bedrock; also transitional base on clay gyttja and laterally passing into laminated minerogenic sediments of the Carse Clay Formation.
has geographical distribution: Surface and buried peats in the Forth (from east of Aberfoyle). Earn (from Dalreoch Bridge eastwards) and Tay (eastwards from just north of Perth) valleys and Forth, Eden and Tay estuaries, Montrose basin areas. (Theoretically many members may be set up to reflect localised developments of peat).
has lithology description: Peat, fine- and coarse-textured, dark to pale brown and locally orange, with wood fragments and a wide variety of organic remains also including Sphagnum; wedges laterally in some areas into laminated minerogenic sediments of the Carse Clay Formation.
has thickness description: Veneer at least 7m
has upper boundary definition: At surface or overlain partly unconformably by Holocene transgressive estuarine sand, silt and clay of the Carse Clay Formation including the Letham Silt Member and the Carse of Stirling Clay Member.

Fulmar Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLMR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KZ
broader: HMBG
has lithology description: /

Flounder Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLND
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KM
broader: STLN

Floral Organic Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: FLORG
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: ORGD
narrower: PEAT

Flodigarry Shale Member
type: Concept
in scheme: NamedRockUnit
alternative label: FLOS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JD
broader: SFSH

Fen Lower Peat
type: Concept
in scheme: NamedRockUnit
alternative label: FLPT
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FLPT PEAT
broader: NE
has lithology description: Peat. [Generic description].

Flying Reed Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FLRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FLRC COAL
broader: PMCM

Filltirgerig Beds
type: Concept
in scheme: NamedRockUnit
alternative label: FLT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE

Flatts Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FLTC
has current status: CURRENT
has theme: BEDRCK
notation: F
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FLTC COAL
broader: PLCM

Flichity Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FLTY
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: F
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38544
has lithology component: FLTY QZITE
has lithology component: FLTY SPELGN
broader: Dava Succession
has lower boundary definition: Unknown contacts either unexposed or tectonised. No way-up criteria.
has geographical distribution: Central Highlands of Scotland. Strathnairn to Findhorn area.
has lithology description: Gneissose semipelite with minor quartzites, more common near contacts with adjacent units.
has upper boundary definition: Transitional boundary with structurally overlying Flitchity Psammite. No way-up criteria.

Flugga Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FLUS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: SELE

Fluvial Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: FLUV
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has lithology component: FLUV CLAY
has lithology component: FLUV GRAV
has lithology component: FLUV SANDU
has lithology component: FLUV SILT
has obsolete equivalent: FLUV mn 1598
broader: SUPD
narrower: Alluvial Fan Deposits
narrower: Alluvium
narrower: RTD

Fleswick Anhydrite
type: Concept
in scheme: NamedRockUnit
alternative label: FLWA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: SBE

Fleswick Dolomite
type: Concept
in scheme: NamedRockUnit
alternative label: FLWD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: SBE

Lower Flaxley Beds
type: Concept
in scheme: NamedRockUnit
alternative label: FLXL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
broader: NE

Upper Flaxley Beds
type: Concept
in scheme: NamedRockUnit
alternative label: FLXU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
broader: NE

Folly Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FLYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has lithology component: FLYC COAL
has obsolete equivalent: FLYC st 324
has lateral equivalent: FLYC st 324
broader: PES

Fauldhead Musselband
type: Concept
in scheme: NamedRockUnit
alternative label: FM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: LCMS

Forest Marble Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FMB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FMb
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38546
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38547
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38545
has lithology component: FMB CALSST
has lithology component: FMB CAMDST
has lithology component: FMB LMOOL
has lithology component: FMB LMST
has lithology component: FMB MDST
has lithology component: FMB SALMST
has lithology component: FMB SDST
has lithology component: FMB SHMDST
has lithology component: FMB SHYLST
has source info: FMB_48752
has source info: FMB_48897
has source info: FMB_49753
has source info: FMB_50034
has source info: FMB_50313
has source info: FMB_50341
has source info: FMB_50393
has source info: FMB_50789
has source info: FMB_51223
has source info: FMB_51693
has source info: FMB_51775
has source info: FMB_52030
has source info: FMB_52258
has source info: FMB_52278
has source info: FMB_52533
has source info: FMB_52641
has source info: FMB_52926
has obsolete equivalent: FMB mn 1615
has obsolete equivalent: FMB mn 4702
has obsolete equivalent: FMB mn 565
has obsolete equivalent: FMB mn 2168
is obsolete equivalent of: FMB BLAD
broader: Great Oolite Group
narrower: Boueti Bed
narrower: Acton Turville Beds
has lower boundary definition: South Midlands and Cotswold region: base of silicate-mudstone, greenish grey, or limestone, typically grey to brown variably sandy medium to coarsely bioclastic grainstone or packstone, resting with erosive, commonly channelled, disconformity on white to yellow, peloidal, ooidal or lime mud-rich, less silici-muddy limestone of the White Limestone Formation or the Chalfield Oolite Formation, or on a bored and oyster-encrusted hardground surface of the ooidal limestone of the Athelstan Oolite Formation. South of the Mendip Hills: marked by the Boueti Bed, a fossiliferous lime-mudstone, resting non-sequentially on olive-grey bioturbated mudstone of the Frome Clay Formation (formerly Upper Fuller's Earth).
has geographical distribution: Onshore: Buckingham area (where either overstepped by the Cornbrash Formation or passes into the Blisworth Clay Formation) to the Weymouth area, Dorset Coast. Present at depth in the Weald. Offshore: English Channel, Bristol Channel, St George's Channel.
has lithology description: Silicate-mudstone, greenish grey, variably calcareous and in the south notably sandy, with lenticular typically cross-bedded limestone units that form banks and channel-fills, especially in lower part. A variety of limestone types occur, of which grey, weathering brown and flaggy, variably sandy medium to coarsely bioclastic grainstone or less commonly packstone predominates, especially at the base, which is increasingly ooidal north from Bath (termed the Acton Turville Beds from Biddestone to Didmarton). Other types include fissile sandy limestone, grading to calcareous sandstone, and oyster-limestone. South of the Mendip Hills, a silici-muddy, fossiliferous lime-mudstone (Boueti Bed) lies at the base. Bivalves and brachiopods dominate the fauna, and lignite debris and fish scales and teeth are common, but infauna and signs of bioturbation are rare. The formation consists of interbedded mudstone and limestone in the Weald and English Channel basins, but in St George's Channel Basin it comprises rhythmically bedded mudstone, siltstone and fine sandstone.
has thickness description: Up to 5m thick in Buckinghamshire, 10 to 30m in Oxfordshire and Gloucestershire, 30 to about 50m in north Dorset, 30 to 75m in south Dorset and the English Channel (Hamblin et al., 1992)(Barton et al., 2008), St George's Channel 242m proved (Tappin et al., 1994)
has upper boundary definition: Generally mudstone in the upper part of the Formation, overlain sharply and non-sequentially by ooidal shelly wackestone/packstone of the Cornbrash Formation.

Finnie's Main Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FMC COAL
broader: MCMS

Forest Marble Formation And Cornbrash Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FMCB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JM
has predominant age: JM
has youngest age: JM
has lithology component: FMCB CALSST
has lithology component: FMCB CAMDST
has lithology component: FMCB LMST
has lithology component: FMCB MDST
broader: Great Oolite Group
has lithology description: See the Lithology descriptions for the component formations.

Fairbottom Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FMCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FMCO COAL
has lateral equivalent: FMCO st 305
has obsolete equivalent: FMCO mn 1512
broader: PMCM

Felsenmeer
type: Concept
in scheme: NamedRockUnit
alternative label: FMEER
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: RDEPS

Forden Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FMF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has obsolete equivalent: FMF mn 1610
broader: NP

Ford Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FORD
has revision number: 4
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38548
has lithology component: FML DOLO
has lithology component: FML LMST
has source info: FML_49811
has source info: FML_49914
has source info: FML_50967
has source info: FML_51249
has source info: FML_51548
has source info: FML_51576
has lateral equivalent: FML SPRO
has obsolete equivalent: FML mn 1609
has obsolete equivalent: FML mn 2867
broader: ZG
narrower: Ford Formation (Patch-Reef)
narrower: Ford Formation (Shelf-Edge Reef)
has lower boundary definition: The incoming of oolitic and pisolitic or reef equivalent dolostone above the fine-grained dolostone of the Raisby Formation. Boundary is transgressive, overlapping older Permian formations to lie unconformably on Carboniferous rocks.
has geographical distribution: Durham province, County Durham, Tyne and Wear, Cleveland and northernmost North Yorkshire.
has lithology description: Dolomite that comprises three distinct facies: shelf-edge reef that separates a broad belt of back-reef and lagoonal beds to the west from a belt of fore-reef talus aprons and off-reef beds to the east.
has thickness description: 1 - 150m, generally 100 - 120m
has upper boundary definition: Either the sharp, conformable base of the overlying anhydrites of the Hartlepool Anhydrite Formation or the reddish-brown mudstone and siltstone of the Edlington Formation

Ford Formation (Patch-Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: FMLP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: FMLP LMST
broader: Ford Formation

Ford Formation (Shelf-Edge Reef)
type: Concept
in scheme: NamedRockUnit
alternative label: FMLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lithology component: FMLS LMST
broader: Ford Formation

Foulport Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FMN
has current status: CURRENT
has theme: BEDRCK
notation: FMN
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CF
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38549
has lithology component: FMN LMST
has lithology component: FMN SDST
has lithology component: FMN SLMDST
has source info: FMN_50587
has source info: FMN_51984
has source info: FMN_52226
has lateral equivalent: FMN st 616
broader: KNW
has lower boundary definition: Conformable on the underlying Doughend Sandstone Member and marked by a change from yellow sandstone with a few concretionary nodules to red-brown mudstone and siltstone of the Foulport Mudstone Member (Monro, 1999; BGS, In preparation).
has geographical distribution: Cumbrae Islands in Strathclyde, Scotland. Unit shown on S21W and part of 21E Irvine, in press [FMN], S29E and part 21E, Dunoon and Millport, in preparation [FMN].
has lithology description: A reddish-brown silty mudstone with a few sandstones and beds with nodules of pedogenic limestone.
has thickness description: About 200m
has upper boundary definition: Conformable and overlain by variegated sandstones with concretions of the West Bay Cornstone Member.

Fontmell Magna Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: FMS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FMS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38550
has lithology component: FMS CALSST
has lithology component: FMS SANDU
has source info: FMS_50932
broader: Gault Formation
has lower boundary definition: Upward change from sandy clay into sand.
has geographical distribution: A limited area around Fontmell Magna, Dorset (ST 867 170).
has lithology description: Fine-grained, clayey, weakly calcareous sand and sandstone.
has thickness description: 0 - 5m
has upper boundary definition: Upward change from sand into sandy clay.

Fife Ness Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FNB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FNB
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38552
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38551
has lithology component: FNB DOLO
has lithology component: FNB MDST
has lithology component: FNB SDST
has lithology component: FNB SEATS
has lithology component: FNB SLST
has source info: FNB_48772
has source info: FNB_51864
has obsolete equivalent: FNB mn 1549
broader: SYG
has additional age information: Early Visean.
has lower boundary definition: The conformable base of the Formation lies in a lithological transition and is taken above the highest bed of carbonate conglomerate belonging to the underlying Clyde Sandstone Formation (formerly Balcomie Beds).
has geographical distribution: East Fife.
has lithology description: Predominantly of sandstones arranged in upward-fining cycles; argillaceous rocks are commonly poorly bedded: mainly fluvial in origin.
has thickness description: Maximum thickness exceeds 230m in east Fife.
has upper boundary definition: Not known at outcrop: would be taken at the lithological change to the relatively mudstone/sitlstone-rich cyclical deposits of the overlying Anstruther Formation from the sandstone dominated sequences of the Fife Ness Formation.

Fence Member
type: Concept
in scheme: NamedRockUnit
alternative label: FNC
has current status: CURRENT
has theme: BEDRCK
notation: FNC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38553
has lithology component: FNC MDST
has source info: FNC_52318
broader: Doularg Formation
has lower boundary definition: Basal member of the Doularg Formation: succeeds the sandstone, pebbly grit and conglomerate of the Craigmalloch Formation.
has geographical distribution: Girvan area, southwest Scotland.
has lithology description: Mudstone (unfossiliferous to date).
has thickness description: 1.5m seen, possibly up to 4m total.
has upper boundary definition: Succeeded by the Gorse Member of the Doularg Formation, consisting of poorly-bedded mudstone with decalcified limestone nodules containing a brachiopod and trilobite fauna.

Fenton Limestone Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FNTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fn
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38554
has lithology component: FNTL LMST
has source info: FNTL_49022
has source info: FNTL_49323
has source info: FNTL_50409
has obsolete equivalent: FNTL mn 1537
broader: Foston Member
has lower boundary definition: Change up from grey mudstone of undifferentiated Foston Member; at 27.10m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
has geographical distribution: East Midlands; north Leicestershire to Lincolnshire. Not recognised in the Scunthorpe Mudstone Formation of north Lincolnshire, or south Leicestershire, where it passes south into either part of the more argillaceous Rugby Limestone Member of the Blue Lias Formation or part of the mudstone dominated Charmouth Mudstone Formation.
has lithology description: Hard, olive grey, brown weathering, finely sandy (especially in the north), silty, bioclastic, fine-grained limestone, in one or locally two beds, with small ammonites and pectiniids. Fauna also includes forams, serpulids, brachiopods, other bivalves, ostracods and echinoderms. Forms a weak feature.
has thickness description: 0.3 to 1.0m; 0.34m in type section
has upper boundary definition: Change up into grey mudstone of undifferentiated Foston Member; at 26.76m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).

Flockton Coal (Undifferentiated) (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FNUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FNUC COAL
broader: PLCM

Folkestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: F
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38555
has lithology component: FO CLAY
has lithology component: FO CSSST
has lithology component: FO GRAV
has lithology component: FO SANDU
has lithology component: FO SDST
has source info: FO_50788
has source info: FO_51157
has source info: FO_51325
has source info: FO_51916
has obsolete equivalent: FO mn 1607
broader: LGS
has lower boundary definition: Contact of sand or sandstone with underlying silty clay or clayey silt of Marehill Clay Member (Sandgate Formation) or with heterogeneous sequence of clays, silts and sands (Sandgate Formation, undifferentiated).
has geographical distribution: West Sussex and SE Hampshire; otherwise circum-Weald.
has lithology description: In Sussex: medium- and coarse-grained, well-sorted cross-bedded sands and weakly cemented sandstones; elsewhere includes calcareous sandstones.
has thickness description: 0.5-80m
has upper boundary definition: In general; upward disappearance of sand at base of Gault Clay but typically at base of short condensed sequence at base of Gault. In Sussex, base of 'Iron Grit' (hard, pebbly, limonitic, coarse-grained sandstone) (see Casey, 1961).

Fochabers Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Foc
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38556
has lithology component: FOC CAMDST
has lithology component: FOC CONG
has lithology component: FOC LMST
has lithology component: FOC MDST
has lithology component: FOC SDST
has lithology component: FOC SLMDST
has source info: FOC_52797
broader: INS
has lower boundary definition: At top of the Spey Conglomerate Formation, the essentially conglomeratic sequence at the base of the Old Red Sandstone succession in the Fochabers area.
has geographical distribution: Not defined.
has lithology description: Red-bed sandstones with sporadic silty calcareous mudstones with fossil fish-bearing limestones/concretions.
has thickness description: Approximately 100m
has upper boundary definition: At diachronous base of the Findhorn Sandstone Group in the Fochabers area where it is marked by yellow to reddish brown fossiliferous sandstones, containing fish, of the Alves-Scaat Craig Beds.

Forth Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOCL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38557
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38558
has lithology component: FOCL C
has lithology component: FOCL S
has lithology component: FOCL V
has lithology component: FOCL Z
has source info: FOCL_49193
has source info: FOCL_49343
has source info: FOCL_50905
has source info: FOCL_51190
broader: British Coastal Deposits Group
narrower: Abbotsgrange Silt Member
narrower: PGCL
narrower: Culfargie Sand Member
narrower: KKSI
narrower: TEGR
narrower: Bothkennar Gravel Member
has additional age information: Early Windermere Interstadial to Early Holocene.
has lower boundary definition: Generally transitional, locally unconformable on the Errol Clay Formation or on glaciofluvial deposits; locally overlies bedrock.
has geographical distribution: River Tay from just northwest of Perth and the Earn from Forgandenny eastwards, and adjacent to the Tay/Earn estuaries; some of the units might occur in the Eden and Montrose basins. Also the River Forth east of Aberfoyle, the Forth estuary and the Firth of Forth.
has lithology description: Clay, silt and sand with sporadic dropstones. For details of lithologies see entries for constituent members.
has supplementary information: In the Tay-Earn and Eden-Montrose basins the formation comprises the Powgavie Clay, Culfargie Sand and Tay-Earn Gravels members. In the Forth area, the formation is represented by the Kinneil Kerse Silt, Abbotsgrange Silt and Bothkennar Gravel Members.
has thickness description: Veneer to >38m
has upper boundary definition: Unconformable top related to marine transgression and regression and associated erosion, overlain by members of the Carse Clay Formation (the Carey Silt and Carse of Gowrie Clay members in the Tay area, the Letham Silt, Carse of Stirling Clay and Claret Clay members in the Forth area), or by the Flanders Moss Peat Formation (the sub-Carse Peat).

Foot Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FOCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FOCO COAL
has obsolete equivalent: FOCO st 326
has lateral equivalent: FOCO st 326
broader: SWMCM

Fodderletter Calcareous Flag Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FODD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Lochaber Subgroup

Fordon Evaporite [Obsolete Code: Use Foev]
type: Concept
in scheme: NamedRockUnit
alternative label: FOE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has lateral equivalent: FOE FOEV
broader: NE

Fordon Evaporite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOEV
has current status: CURRENT
has theme: BEDRCK
notation: FOEV
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38559
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38560
has lithology component: FOEV ANHY
has lithology component: FOEV DOLO
has lithology component: FOEV GYPST
has lithology component: FOEV HALI
has lithology component: FOEV MDST
has source info: FOEV_48679
has source info: FOEV_49384
has source info: FOEV_49810
has source info: FOEV_50085
has source info: FOEV_50086
has source info: FOEV_50438
has source info: FOEV_51868
has source info: FOEV_53001
has lateral equivalent: FOEV st 523
has lateral equivalent: FOEV st 739
has obsolete equivalent: FOEV mn 1612
has obsolete equivalent: FOEV mn 2577
has obsolete equivalent: FOEV mn 1611
broader: ZG
has lower boundary definition: In the Durham province: contact (gradational transition) with the underlying Roker Formation (including the Concretionary Limestone Member) dolostone, marked by the incoming of evaporite rocks. In the Yorkshire province:contact with the top of the Kirkham Abbey Formation dolostone, the incoming of evaporite rocks.
has geographical distribution: Zechstein Basin of Northeast England.
has lithology description: A thick and varied sequence of evaporites including anhydrite and halite, with some gypsum and dolostone. Passes laterally into Seaham Residue at outcrop in Durham, and into part of Edlington Formation in Yorkshire outcrop.
has thickness description: 396m in type section; thins to small residue at outcrop.
has upper boundary definition: Drawn at base of Brotherton Formation (Yorkshire province) or Seaham Formation (Durham province], marked by the incoming of limestone.(Stated as base of Upper Magnesian Limestone in Smith, et al., 1974).

Foel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/38561
has lithology component: FOF DOLMST
has lithology component: FOF LMST
has lithology component: FOF SDST
has lithology component: FOF SLST
has source info: FOF_50170
has source info: FOF_51187
has source info: FOF_51416
has source info: FOF_52509
has obsolete equivalent: FOF mn 2521
broader: Clwyd Limestone Group
has additional age information: Late Chadian.
has lower boundary definition: Locally conformably overlies reddened "Basement Beds" (Ffernant Formation or Penbedw Formation); but elsewhere rests unconformably on Silurian rocks of the Clwydian Range (Nantglyn Flags Formation and Elwy Formation.
has geographical distribution: Confined to the north and east of the Clwydian Range in northeast Wales, between Moel Hiraddug [SJ0778] and Gelli Gynan. [SJ1854].
has lithology description: Heterolith of dark-grey, peloidal limestones, shelly, oncolitic and locally oolitic limestones, porecllanous limestones, and fossil plant-bearing calcareous siltstones and calcareous sandstones. Limestones locally dolomitised. The oldest exposed parts of the Clwyd Limestone Group, the Foel Formation records peritidal deposition during the onset of the Dinantian transgression of North Wales.
has thickness description: To 88m
has upper boundary definition: Conformable contact with thicker-bedded limestones of the Llanarmon Limestone Formation.

Foggs Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FOGC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FOGC COAL
has obsolete equivalent: FOGC mn 1606
has lateral equivalent: FOGC st 322
broader: PLCM

Foul Hosie Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FOHO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: FOHO LMST
has source info: FOHO_51867
broader: LLGS

Fooden Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FOL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has lithology component: FOL LMST
has lithology component: FOL MDST
has lateral equivalent: FOL PHBL
broader: HOM
has geographical distribution: The Clitheroe district, Lancashire.
has lithology description: Dark-blue limestones and shaly mudstones.

Folkeston Coal (Milford, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FOLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CD
has lithology component: FOLC COAL
has obsolete equivalent: FOLC st 323
has lateral equivalent: FOLC st 323
broader: PES

Foel Fadian Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOLF
has current status: CURRENT
has theme: BEDRCK
notation: FOLF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Forest Lodge Member
type: Concept
in scheme: NamedRockUnit
alternative label: FOLO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Glen Banvie Formation

Foyle Marl
type: Concept
in scheme: NamedRockUnit
alternative label: FOMA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
broader: ZZCH

Fluvial And Older River Sands And Gravels
type: Concept
in scheme: NamedRockUnit
alternative label: FORA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FORA GRAV
has lithology component: FORA SANDU
broader: NE
has lithology description: Sand and gravel; of fluvial origin; includes modern and historical deposits. [Generic description].

Fluvial And Older River Sands And Gravels With Associated Clay
type: Concept
in scheme: NamedRockUnit
alternative label: FORC
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FORC CLAY
has lithology component: FORC GRAV
has lithology component: FORC SANDU
broader: NE
has lithology description: Sand and gravel with silt and clay; of fluvial origin; includes modern and historical deposits. [Generic description].

Forth Catchments Subgroup
type: Concept
in scheme: NamedRockUnit
alternative label: FORCA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: UG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42900
has lithology component: FORCA C
has lithology component: FORCA P
has lithology component: FORCA S
has lithology component: FORCA V
has lithology component: FORCA Z
has source info: FORCA_52323
broader: Britannia Catchments Group
has lower boundary definition: Unconformable contact with units of the Midland Valley, Mearns and Central Grampian Glacigenic subgroups and bedrock.
has geographical distribution: The present physical catchments of the River Forth and the Firth of Forth. The catchments extend across Stirlingshire, Clackmannanshire, south Fife and the Lothians.
has lithology description: A suite of fluvial (river terrace sand and gravel and alluvium) and related lacustrine (clay, silt) and organic (peat) deposits. The fluvial sand and gravels are derived from bedrock and glacigenic sediments. Clasts are composed of mainly Palaeozoic rocks cropping out in the Midland Valley of Scotland and southern Grampian Highlands. Rock types are principally of Carboniferous and Devonian strata (sandstone, siltstone) with volcanic (basalt) and intrusive igneous rocks (microdiorite) of Midland Valley provenance. Variable but generally minor components of Dalradian metasedimentary and Caledonian intrusive igneous rocks derived from the Grampian Highlands are present.
has thickness description: To 25m
has upper boundary definition: Generally the ground surface, but units of the subgroup may be overlain locally by mass movement deposits or may locally interfinger with units of the British Coastal Deposits Group.

Fordyce Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FORD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42901
has lithology component: FORD CALSIR
has lithology component: FORD MLMST
has lithology component: FORD PEL
has lithology component: FORD QZITE
has lithology component: FORD SEMPEL
has source info: FORD_48670
has source info: FORD_49235
has obsolete equivalent: FORD mn 3710
broader: Blair Atholl Subgroup
narrower: LIML
narrower: KEIT
has lower boundary definition: Base of dark pelites and semipelites overlying paler calcareous, banded phyllitic semipelites and psammites of the Tarnash Phyllite and Limestone Formation. (Base not seen in type section.)
has geographical distribution: Sandend Bay to Mill of Wood Burn, Keith (Sheets 86W, 96W)
has lithology description: Mostly semipelite and pelite with beds of metalimestone, some thick and massive. Minor beds of calc-silicate rock and quartzite.
has thickness description: 700m maximum (based on outcrop width and average dip), >160m on coast at Sandend Bay.
has upper boundary definition: Top of dark pelites and semipelites beneath Durn Hill Quartzite Formation. (Top not seen in type or reference sections.)

Forties Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FORS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: SELE

Foula Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: FOS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
broader: NE

Folkestone Formation And Sandgate Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FOSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KP
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: KA
has lithology component: FOSA CALSST
has lithology component: FOSA CLAY
has lithology component: FOSA CSSST
has lithology component: FOSA GRAV
has lithology component: FOSA LMST
has lithology component: FOSA SANDU
has lithology component: FOSA SDST
has lithology component: FOSA SILT
has lithology component: FOSA SMCCST
broader: LGS
has lithology description: See the Lithology descriptions for the component formations.

Folly Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: FOST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/!
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
has lithology component: FOST SDST
broader: NA
has geographical distribution: Presteigne - Knighton area of mid-Wales.
has thickness description: 30m

Forse Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: FOTI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: FT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42902
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42903
has lithology component: FOTI BL
has lithology component: FOTI CLAY
has lithology component: FOTI DMTN
has lithology component: FOTI SANDU
has lithology component: FOTI SILT
has source info: FOTI_48766
has source info: FOTI_48901
has source info: FOTI_48983
has source info: FOTI_51602
has source info: FOTI_52025
has obsolete equivalent: FOTI mn 746
has obsolete equivalent: FOTI mn 2698
has obsolete equivalent: FOTI mn 3839
has lateral equivalent: FOTI st 328
has obsolete equivalent: FOTI mn 3837
broader: REDR
has lower boundary definition: Unconformable on bedrock.
has geographical distribution: Caithness and Sutherland, northeast of a line between Reay and Berridale (1:50 000 sheets 115E and W, 116 E and W and sheet 110)
has lithology description: Diamicton, sandy, silty and clayey, typically dark grey to olive grey and grey brown, often weathered and mottled in the upper parts to orange, brown and yellow, cobble and boulder sized-clasts include Devonian flagstones, Jurassic and Lower Cretaceaous mudstones, siltstones, sandstones and shell fragments together with Moine metamorphic and Caledonian igneous rocks.
has thickness description: To 25m
has upper boundary definition: The base of the Ellanmore Lower Gelifluctate Member (Hall and Whittington, 1989), which although distinctive, is considered too thin at less than 1m thick, to be formalised as a separate unit.

Foel Tyrch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOTY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: NE
has additional age information: ? to Fennian (uppermost Arenig).

Foula Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOUL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
has source info: FOUL_51880
broader: PAPA

Foundered Strata
type: Concept
in scheme: NamedRockUnit
alternative label: FOUN
has current status: CURRENT
has theme: MASMVT
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FOUN CLAY
has lithology component: FOUN ROCK
broader: NE

Forth Valley Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOVA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42904
has lithology component: FOVA B
has lithology component: FOVA C
has lithology component: FOVA P
has lithology component: FOVA S
has lithology component: FOVA V
has lithology component: FOVA Z
has source info: FOVA_49343
has obsolete equivalent: FOVA mn 1643
broader: Britannia Catchments Group
has additional age information: Late Devensian to Holocene.
has lower boundary definition: Unconformably overlies older Quaternary deposits and bedrock.
has geographical distribution: Recognized in the Forth catchment area as the alluvial deposits of the Forth and all its tributaries, from highest to lowest order, includes valleys of the River Tyne (East Lothian), Water of Leith, Almond, Avon, Carron, Devon and Teith.
has lithology description: A wide range of lithologies encompassing pebbles, fine to coarse gravel, cobbles and boulders in a sandy matrix and coarse- to fine-grained sand, silt and clay. Some beds rich in organic remains and peat occur in the floodplain deposits.
has thickness description: Veneer to several metres.
has upper boundary definition: Normally the land surface.

Fownhope Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOW
has current status: CURRENT
has theme: BEDRCK
notation: FOW
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42905
has lithology component: FOW SARCST
has lithology component: FOW SDST
has lithology component: FOW SLST
has source info: FOW_49504
has source info: FOW_51403
has obsolete equivalent: FOW mn 3553
has lateral equivalent: FOW CPA
broader: MHS
has lower boundary definition: At unconformity at top of the Ordovician Tremadoc, pale grey siltstones and claystones where they are overlain by red beds of the Fownhope Formation. At 3628 feet depth in the Fownhope Borehole.
has geographical distribution: Proved only in Fownhope Borehole; seismic evidence indicates its presence at depth to the west.
has lithology description: Interbedded red-brown siltstones and sandstones.
has thickness description: 1302 feet drilled in Fownhope Borehole; about 370m corrected for dip.
has upper boundary definition: At colour change from red-beds to green-grey siltstones and sandstones of the Huntley Hill Formation. At 2326 feet depth in the Fownhope Borehole, and prominent seismic marker.

Foxholes Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FOXH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FOXH COAL
has lateral equivalent: FOXH st 335
has lateral equivalent: FOXH st 565
has obsolete equivalent: FOXH mn 1635
broader: PMCM

Foyers Igneous Complex
type: Concept
in scheme: NamedRockUnit
alternative label: FOY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: FOY DI
has lithology component: FOY GD
has lithology component: FOY GN
has lithology component: FOY HBDI
has lithology component: FOY MCDI
has lithology component: FOY MCGD
has lithology component: FOY MCGN
has lithology component: FOY MCGNA
has lithology component: FOY MCQDI
has lithology component: FOY MZDI
has lithology component: FOY MZGN
has lithology component: FOY QDI
has lithology component: FOY QMZ
has lithology component: FOY QMZDI
broader: Argyll And Northern Highlands Granitic Suite

Foyers Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FOYS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: FOYS CONG
has lithology component: FOYS FAREN
has lithology component: FOYS PESST
has lithology component: FOYS SDST
broader: INS

Freemanstown Picrite
type: Concept
in scheme: NamedRockUnit
alternative label: FP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
broader: NE

Fishpool Farm Grits
type: Concept
in scheme: NamedRockUnit
alternative label: FPFG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Flood Plain Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FPGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: FPGR GRAV
has lithology component: FPGR SANDU
is obsolete equivalent of: FPGR KPGR
broader: NE
has lithology description: Gravel and sand, locally with silt and clay interbeds; sheet-like form, restricted to the floodplain environment. [Generic description: 1:50 k map margins].

Falls Of Phones Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FPHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42906
has lithology component: FPHS PSAMI
has lithology component: FPHS SPELGN
has lithology component: FPHS SPSCH
has source info: FPHS_51186
has obsolete equivalent: FPHS mn 2920
broader: STEL
has lower boundary definition: Top of the Feshiebridge Psammite Formation (Etteridge Lodge Psammite and Pelite Formation), where interbedded psammite and subordinate semipelite and pelite is overlain by predominantly gneissose biotite-rich semipelite of the Falls of Phones Semipelite Formation.
has geographical distribution: Southeast of the Ericht-Laidon Fault, south of Newtonmore, extending from Crubenmore to Phones Lodge on Sheet 64W.
has lithology description: Semipelite, mainly gneissose but locally schistose, dominantly biotite- (but subsidiary muscovite-garnet-) bearing, with local lenses of micaceous psammite.
has thickness description: c.100m
has upper boundary definition: Base of the Gaick Psammite Formation, where predominantly quartzose and feldspathic psammites overlie the predominantly gneissose biotite-rich semipelite of the Falls of Phones Semipelite Formation

First Piper Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FPIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FPIC COAL
has lateral equivalent: FPIC st 124
broader: PLCM

Friars Point Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FPL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FPL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42908
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42907
has lithology component: FPL ARLMST
has lithology component: FPL DOLMST
has lithology component: FPL LMST
has lithology component: FPL MDST
has source info: FPL_48717
has source info: FPL_49355
has source info: FPL_49797
has source info: FPL_51166
has source info: FPL_51798
has source info: FPL_52569
has obsolete equivalent: FPL mn 3264
has obsolete equivalent: FPL mn 4128
has obsolete equivalent: FPL mn 461
has obsolete equivalent: FPL mn 2322
has obsolete equivalent: FPL mn 2568
has obsolete equivalent: FPL mn 3680
has obsolete equivalent: FPL mn 458
has obsolete equivalent: FPL mn 2317
broader: Black Rock Limestone Subgroup
has lower boundary definition: In the Barry area, the base of the Formation is taken at the sharp contact between the crinoidal grainstones of the Yorke Rock Bed that caps the Barry Harbour Limestone Formation, and the overlying thin- to medium-bedded, fine- to coarse-grained, skeletal packstones with scattered thin beds and partings of mudstone of the Friars Point Limestone Formation. North of Barry, the base of the Formation is taken at the sharp junction of the oolitic grainstones of the Brofiscin Oolite Formation and the overlying thin- to medium-bedded skeletal packstones of the Friars Point Limestone Formation. Along the southeast and east crop of the South Wales Coalfield the base is taken at the sharp junction between the dolomitized oolite of the Brofiscin Oolite Formation and the very fine- to fine-grained dolomitised packstones of the Friars Point Limestone Formation.
has geographical distribution: Vale of Glamorgan [ST 00 74]. Present in Gower [SS 50 90], Pembrokeshire [SM 99 01], east crop of the South Wales Coalfield [ST 25 90], Monmouth/Chepstow [ST 53 93] and Bristol/Mendip [ST 50 65] areas but not mapped. Passes northwards in Wales into the Clydach Valley Subgroup.
has lithology description: Thin- to thick-bedded, dark grey to black, foetid, fine- to coarse-grained skeletal [mainly crinoid] packstones with subordinate thin beds of shaly argillaceous skeletal packstones and mudstone. Widespread burrowing and a lack of tractional structures characterises all but the lowermost part of the formation. The upper part of the formation is dolomitised in the south, while along the southern and eastern crop of the South Wales Coalfield the entire Formation is dolomitised. Formation deposited in a mid ramp enviroment.
has thickness description: 410m+ in the south of the Vale of Glamorgan, thinning northwards to 76m on the south crop of the South Wales Coalfield.
has upper boundary definition: The top of the formation is taken at the sharp contact between the dolomitised packstones of the Formation and the overlying oolitic grainstones or dolomitised oolite of the Gully Oolite Formation. In the south the junction appears conformable but in the north a thin red clay overlying a palaeokarstic surface is locally present; in such cases the top is taken at the top of the red clay.

Foul Port Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FPM
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
notation: FPM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Five-Quarter Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: FQ
has current status: CURRENT
has theme: BEDRCK
notation: FQ
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FQ COAL
has lateral equivalent: FQ st 131
has lateral equivalent: FQ st 304
broader: PMCM

Fisson's Quarry Conglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: FQC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
has lithology component: FQC CONG
broader: NE

River Terrace Deposits, 2 (Frome, Glos)
type: Concept
in scheme: NamedRockUnit
alternative label: FR2
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: FR2 GRAV
has lithology component: FR2 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

River Terrace Deposits, 3 (Frome, Glos)
type: Concept
in scheme: NamedRockUnit
alternative label: FR3
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: FR3 GRAV
has lithology component: FR3 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

River Terrace Deposits, 4 (Frome, Glos)
type: Concept
in scheme: NamedRockUnit
alternative label: FR4
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QF
has predominant age: QF
has youngest age: QF
has lithology component: FR4 GRAV
has lithology component: FR4 SANDU
broader: NE
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].

Frances Craig Sill
type: Concept
in scheme: NamedRockUnit
alternative label: FRAN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/C
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: PL
has lithology component: FRAN BA
broader: MCPAS

Fraserburgh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
broader: RLG

Frome Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JN
has predominant age: JN
has youngest age: JN
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42909
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42910
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42911
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42912
has lithology component: FRC ARLMST
has lithology component: FRC CAMDST
has lithology component: FRC MDST
has lithology component: FRC SHMDST
has source info: FRC_48762
has source info: FRC_48892
has source info: FRC_49332
has source info: FRC_50340
has source info: FRC_52790
has obsolete equivalent: FRC mn 1664
broader: Great Oolite Group
narrower: WAB
has lower boundary definition: The base of the Wattonesis Beds Member, a thin unit (3m) of argillaceous limestones and mudstones, base defined by a increase of shell-detritus in the calcareous mudstone.
has geographical distribution: Bath, Somerset, to Dorset coast.
has lithology description: Olive-grey mudstone with minor limestone units.
has thickness description: 20 to 50m in Wiltshire and Somerset, 45 to 70m in Dorset, 68.1m in Spetisbury Borehole (see References).
has upper boundary definition: The base of the Boueti Bed (Forest Marble Formation) a thin shell-fragmental muddy limestone with abundant Goniorhynchia boueti.

Frith Crag Breccia Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRCR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FrCr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42913
has lithology component: FRCR TUFBRC
has source info: FRCR_48972
has source info: FRCR_50109
has obsolete equivalent: FRCR mn 1647
has obsolete equivalent: FRCR mn 1648
broader: Birker Fell Andesite Formation
has lower boundary definition: Taken at the base of the unit of tuff-breecia overlying andesite within the Birker Fell Andesite Formation
has geographical distribution: Restricted to the area between Haweswater and Ralfland Forest, northeastern Lake District, Cumbria
has lithology description: Massive tuff-breccia, matrix- to clast-supported
has thickness description: Up to 160m
has upper boundary definition: Defined by the base of the overlying andesites of the Birker Fell Andesite Formation

Freehay Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FRE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TL
has predominant age: TL
has youngest age: TL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42914
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42915
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42916
has lithology component: FRE CONG
has lithology component: FRE MDST
has lithology component: FRE PESST
has source info: FRE_48799
has source info: FRE_52993
broader: Hawksmoor Formation
has lower boundary definition: Where conglomerates become the dominant lithology over sandstone.
has geographical distribution: Cheadle area, Staffordshire.
has lithology description: Conglomerates with subordinate pebbly sandstones and sporadic mudstone bands.
has thickness description: To 56m
has upper boundary definition: Where conglomerate ceases to predominate over sandstone.

Fremington Member
type: Concept
in scheme: NamedRockUnit
alternative label: FREM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: Codden Hill Chert Formation

Frizington Limestone Formation And Eskett Limestone Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FRESK
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CE
has lithology component: FRESK LMST
broader: Great Scar Limestone Group
narrower: L5L7

Farrington Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42917
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42918
has lithology component: FRF COAL
has lithology component: FRF MDST
has lithology component: FRF SDST
has lithology component: FRF SEATM
has source info: FRF_49279
has source info: FRF_51436
has source info: FRF_52591
has obsolete equivalent: FRF mn 1525
has obsolete equivalent: FRF mn 1528
broader: Grovesend Formation
narrower: N10C
narrower: NEWC
narrower: MLEC
narrower: PEAC
narrower: Hard Coal (Bristol Area)
narrower: High Coal (Bristol Area)
narrower: HLYB
narrower: NO5C
narrower: NO7C
narrower: NO9C
narrower: Avonmouth No.1 Coal
narrower: Avonmouth No.2 Coal
narrower: ROCC
narrower: TOCO
narrower: RUDC
narrower: Brights Coal (Somerset)
narrower: Big Coal (Somerset)
has lower boundary definition: Base of Member taken at the top of the Rudge Vein Coal in the Somerset Coalfield; top of the High Vein Coal in the Bristol Coalfield; top of the Avonmouth No. 2 Coal in the Severn Coalfield. Underlain by sandstones of the Mangotsfield Member and overlain by grey mudstone of the Farrington Member.
has geographical distribution: Bristol, Somerset and Severn coalfields.
has lithology description: Grey mudstone with subordinate sandstone (lithic arenite) beds and numerous thin coal seams associated with comparatively thick seatearth clays.
has thickness description: Up to 425m in the Radstock part of the Somerset Coalfield.
has upper boundary definition: Top of the uppermost coal seam of the Farrington Member, overlain conformably by red and grey measures of the "Barren Red Member".

Fron Fawr Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRFA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42919
has lithology component: FRFA BREC
has lithology component: FRFA CONG
has lithology component: FRFA LMST
has lithology component: FRFA MDST
has lithology component: FRFA SDST
has lithology component: FRFA SLST
has source info: FRFA_49279
has source info: FRFA_50795
has source info: FRFA_52033
has obsolete equivalent: FRFA mn 304
broader: NP
has additional age information: ?Arundian to Early Asbian.
has lower boundary definition: Rests unconformably on Silurian rocks (Elwy Formation and Dinas Bran Beds).
has geographical distribution: West of Eglwyseg Rocks escarpment (SJ 22 45), north of Llangollen, North Wales.
has lithology description: Red, purple and variegated silty mudstones, siltstones and sandstones with lenticular conglomerates and basal breccias. The silty mudstones locally display glaebular calcrete profiles including abundant calcareous nodules and thin units of nodular limestone. Records the accumulation of terrestrial scree and alluvial deposits in a fault controlled embayment prior to the establishment of the Clwyd Limestone Group carbonate platform.
has thickness description: To 90m
has upper boundary definition: Conformable contact with limestones of the Leete Limestone Formation.

Four Feet Coal (Warwickshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FRFT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FRFT COAL
broader: PMCM

Frog Lane Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FRGL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FRGL COAL
broader: SWMCM

Frogmore Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FRGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: FRGR GRAV
broader: NE

Forster's Hill Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FRH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FRH LMST
broader: YORE

Frog Hall Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRHA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42920
has lithology component: FRHA C
has lithology component: FRHA P
has lithology component: FRHA S
has lithology component: FRHA V
has lithology component: FRHA Z
has source info: FRHA_49131
has source info: FRHA_50812
has source info: FRHA_50918
has source info: FRHA_51887
has source info: FRHA_52088
has obsolete equivalent: FRHA DMG
has obsolete equivalent: FRHA mn 1650
has obsolete equivalent: FRHA ALF
broader: Warwickshire Avon Valley Formation
has additional age information: Mid Pleistocene (MI Stages 9 to 8).
has lower boundary definition: Unconformable, channelled base on Wolston Formation or Triassic bedrock.
has geographical distribution: Confined to immediate vicinity of Stretton-on-Dunsmore, Warwickshire [SP 41 73], largely within a minor un-named tributary of the River Leam ("Alluvial fan gravels" of BGS Sheet 184).
has lithology description: Predominantly cold phase sands and gravels that infill a channel incised, to a level several metres below the Dunsmore Gravel "plateau", into the Wolston Formation and underlying Triassic bedrock and grade southwards into the valley of the River Leam (a principal Avon tributary). Lithologically similar to the Dunsmore Gravel Member (Wolston Formation), being dominated by clasts of Triassic ("Bunter") lithologies and flint, but compositionally more mature, and also containing clasts of ironpan (ferricrete) derived from Dunsmore Gravel. At the type locality it includes organic peaty deposits ("Frog Member") assigned to MIS 9 at base. Probably contemporaneous with the Pershore Member (Avon Valley Formation).
has supplementary information: (A) The unit is referred to here as the Frog Hall Member as this is the name used in Bowen 1999. For consistency with other members in this part of the framework it should perhaps be Frog Hall Sand and Gravel Member. (B) The temperate ?Frog Member? (= Frog Hall Bed[s] of manuscripts) is included here in the Frog Hall [Sand and Gravel] Member, though Maddy had this as a member in its own right in Bowen (1999). (C) The upper boundary is given as ?ground surface? though head, colluvium or soil deposits may intervene.
has thickness description: 0 to c 9m.
has upper boundary definition: Ground surface.

Frigg Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRIS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: HORD

Fochriw Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FRIWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: FRIWC COAL
broader: SWUCM

Farlow Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: FRL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Frl
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
has lithology component: FRL SDST
has source info: FRL_48903
has source info: FRL_50414
has source info: FRL_50612
has source info: FRL_50996
has source info: FRL_52293
has obsolete equivalent: FRL mn 1524
broader: NP

Fourlaws Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: FRLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FRLC COAL
has source info: FRLC_51867
has lateral equivalent: FRLC st 403
has lateral equivalent: FRLC st 418
broader: TYLS
has geographical distribution: Northumberland.
has supplementary information: Formerly considered to be within the lower part of the Lower Limestone Formation.
has thickness description: c.0.9m

Frizington Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRLI
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42921
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42922
has lithology component: FRLI CALSST
has lithology component: FRLI CLCRET
has lithology component: FRLI COAL
has lithology component: FRLI LMST
has lithology component: FRLI MDST
has lithology component: FRLI SDST
has lithology component: FRLI SLST
has source info: FRLI_48926
has source info: FRLI_49423
has source info: FRLI_49538
has source info: FRLI_49552
has source info: FRLI_51342
has source info: FRLI_52813
has source info: FRLI_52989
has obsolete equivalent: FRLI mn 3819
broader: Great Scar Limestone Group
narrower: LM7
has lower boundary definition: The lower boundary is generally marked by a disconformity at the top of the underlying Courceyan age Marsett Formation (formerly Basal Beds (Cumbria) Formation), or locally, the Cockermouth Volcanic Formation. The disconformity surface may be identified in borehole records, but in outcrop in West Cumbria, the boundary is conveniently taken at the sharp change from conglomerate, sandstone, mudstone or basalt lava to cross-bedded calc-arenite and limestone. The disconformity represents a depositional hiatus spanning the Chadian and Arundian stages, except in a single instance in the Sellafield area where a few metres of late Chadian strata are preserved below the formation base (Sellafield Borehole No.3, Barclay et al., 1994). In places along the northern margin of the Lakeland fells (Eastwood et al., 1968) the formation oversteps the Marsett Formation and directly overlies Lower Palaeozoic Skiddaw Group or Borrowdale Volcanic Group rocks, and as such, the lower boundary is the base Carboniferous unconformity.
has geographical distribution: Between Whitehaven and Penrith, in west and north Cumbria, the western limit is truncated below the Permo-Triassic basal unconformity, and the eastern limit is taken at the Kirk Rigg Fault, along the line of the A66 highway, west of Penrith (McCormac, 2001).
has lithology description: A buff to dark grey, bioclastic, sandy grainstone to packstone and fenestral lime mudstone, displaying tabular or cross bedding, containing stromatolites and Lithostrotion, Syringopora and Siphonodendron coral colonies.
has thickness description: From 50m to 100m
has upper boundary definition: The top of the limestone beds with a Holkerian fauna, or the base of the limestone beds containing a late Asbian fauna. In addition, the top of the beds of mudstone interbedded with calcrete and palaeokarstic limestone (Sixth Shale Member of the West Cumbria orefield) boundary picked in the Sellafield Borehole No.3 (Barclay et al., 1994), corresponds to a prominent palaeokarstic surface, and in the Uldale area [NY 2560 3700], the top of the Formation is a palaeosol containing a thin coal seam (Eastwood et al., 1968).

Frizington Limestone Formation And Sixth Limestone (Cumbria) (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FRLM6
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: FRLM6 LMST
broader: Great Scar Limestone Group

Frodsham Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FsS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: TL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: TA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42923
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42924
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42925
has lithology component: FRM SDST
has source info: FRM_48928
has source info: FRM_50451
has source info: FRM_50673
has source info: FRM_51487
has source info: FRM_52496
has source info: FRM_52706
has obsolete equivalent: FRM HEY
has obsolete equivalent: FRM mn 304
broader: Helsby Sandstone Formation
has lower boundary definition: Lowermost occurrence of non-pebbly weakly-cemented sandstone, with characteristic 'dome-shaped dune' structures on the dominantly pebbly sandstone of the underlying Delamere Pebbly Sandstone Member.
has geographical distribution: Cheshire Basin; possibly also the southern part of the East Irish Sea Basin.
has lithology description: Sandstone, reddish-orange, predominantly fine-grained; well-sorted with spherical to subspherical-grains; large-scale dune bedding common; characrterised by presence of 'dome-shaped dune' structures. Weakly cemented in comparison to underlying Delamere Pebbly Sandstone Member.
has thickness description: 55m in the Marston region, North Cheshire. 30.14m at Ford Pumping Station (SJ28NE/3), Wirral. 21.1m in the Heron Road Borehole (SJ28NW/22), Wirral.
has upper boundary definition: Uppermost occurrence of weakly-cemented non-pebbly sandstone with characteristic dome-shaped dune structures, under interbedded siltstone and subordinate sandstone of the Tarporley Siltstone Formation (Mercia Mudstone Group).

Fron Newydd Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42926
has lithology component: FRN FEST
has lithology component: FRN MDST
has source info: FRN_48824
has source info: FRN_49391
has source info: FRN_51272
has source info: FRN_52182
has obsolete equivalent: FRN mn 3151
has obsolete equivalent: FRN mn 3150
broader: TYGN
has additional age information: Caradoc (gracilis to ?multidens biozones).
has lower boundary definition: Conformably overlies the Llyn y Gafr Volcanic Formation in the east of the outcrop where the boundary is sharp but poorly exposed. Unconformable contact to west, greatest at Llwyngwril, where it overlies the Allt Llwyd Formation.
has geographical distribution: Continuous outcrop from the coast as far as Cross Foxes (at least). Changes facies however.
has lithology description: Black pyritic mudstones with abundant phosphate nodules. Ooliths common in nodules - less common in matrix. Localised developments of pure oolitic ironstone.
has thickness description: Mostly about 25m in thickness but locally ranges up to 180m thick at western end of outcrop. Some rapid lateral variations in thickness.
has upper boundary definition: Conformable transition from black nodular mudstones to paler mudstones of the Ty'r Gawen Mudstone Formation lacking in nodules. Contact not seen but makes a distinct feature or hollow.

Fernagh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRNA
has current status: CURRENT
has theme: BEDRCK
notation: FRN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42927
has lithology component: FRNA FELS
has lithology component: FRNA LAVA
has source info: FRNA_48647
has obsolete equivalent: FRNA mn 1538
broader: TVG
has lower boundary definition: Where seen, intrusive contact with structurally underlying Tonalite intrusion.
has geographical distribution: Fernagh, Brackagh South and Cashel Rock, County Tyrone, Northern Ireland.
has lithology description: Pale buff, pinkish and green aphanitic sometimes flow banded and auto-brecciated lavas and partly intrusive felsite.
has thickness description: Max 300m
has upper boundary definition: Not exposed but most likely to be conformable with overlying tuffs and lava of Tyrone Volcanic Group.

Farne Group [Offshore]
type: Concept
in scheme: NamedRockUnit
alternative label: FRNE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CN
broader: NE
narrower: SCF
narrower: YOF
narrower: Cementstone Formation
narrower: Fell Sandstone Formation

Frome-Piddle Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRPI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42928
has lithology component: FRPI C
has lithology component: FRPI P
has lithology component: FRPI S
has lithology component: FRPI TUFA
has lithology component: FRPI V
has lithology component: FRPI Z
has source info: FRPI_49118
has source info: FRPI_50639
has source info: FRPI_52383
has source info: FRPI_52921
broader: SNTCA
has additional age information: Early Pleistocene to Holocene.
has lower boundary definition: The fluvial deposits rest unconformably on Chalk Group and Palaeogene strata.
has geographical distribution: The catchment of the rivers Frome and Piddle and their tributaries, Dorset, up to OD +125m.
has lithology description: Floodplain alluvium and river terrace deposits. The floodplain alluvium comprises clay and silt overbank deposits, with local peat, overlying sand and gravel. The surviving river terrace deposits are largely gravel with interstitial sand. The major pebble lithologies are flint, quartz and Mesozoic chert. The gravel units were deposited by braided rivers under periglacial conditions.
has thickness description: To 20m
has upper boundary definition: Surface.

Ferruginous Sands Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FRS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FrS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42930
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42929
has lithology component: FRS MDST
has lithology component: FRS SANDU
has lithology component: FRS SDST
has source info: FRS_49557
has source info: FRS_50410
has source info: FRS_50471
has source info: FRS_50663
has source info: FRS_51325
has source info: FRS_51525
has source info: FRS_53067
has obsolete equivalent: FRS mn 1543
has obsolete equivalent: FRS mn 1544
broader: LGS
has lower boundary definition: The lower boundary is marked by a down-section change from Ferruginous sands and sandstones with concretions, via a narrow transition to silty clays of the Upper Atherfield Clay Formation.
has geographical distribution: Isle of Wight and southern Dorset.
has lithology description: The formation comprises: A succession of three upward coarsening clay rich and glauconitic, shelly and bioturbated sands and sandstones with nodules at the base ["Lower Gryphaea Beds", "Lower Gryphaea Group", "Group IV" and including the "Terebratula Beds"]. Glauconitic, very fossiliferous sands with phosphatic nodules [near the base] and calcareous nodules ["Scaphites Group", "Group V"]. Grey-green, argillaceous sand with bands of concretions, and common ammonites and bivalves ["Lower Criceras Bed", "Group VI"]. Muddy sands and sandy clays with phosphatic nodules and shelly ["Walpen Clay and Sand", "Group VII"; "Whale Chine Member"]. Brown-weathering, fossiliferous clayey sand with horizons of large phosphatic nodules. Gradually upward coarsening. ["Upper Criceras Beds", "Group VIII"] Greenish and grey sands with a band of gritty olive-green, calcareous nodules at the base. Gradually upward coarsening, ["Walpen and Ladder Sands", "Group IX", "Ladder Chine Member"]. Ferruginous, clayey sands with bands of Exogyra and plant debris, ["Upper Gryphaea Beds", "Group X","Member X"]. Glauconitic, bioturbated, sands and clays with shell and plant debris ["Cliff-end Sands", "Group XI", "Member XI"]. Glauconitic sand with dark, grey, pyritic clay drapes and lenses of coarse, current-bedded, friable sandstone ["Foliated Clay and Sand", "Group XII", "Old Walpen Chine Member"]. Glauconitic, pale-green, yellow and brown sands with a marked erosion surface and pebble bed at the base and a fossiliferous nodule horizon in the middle of the unit which has been called "Urchin Bed" ["Sands of Walpen Undercliff", "Group XIII", "New Walpen Chine Member"]. Brown and yellow sands and cemented sandstones with three bands of iron and abundant moulds and impressions of shelly fossils. Bioturbated, particularly at the top ["The Ferruginous Bands of Blackgang Chine", "Group XIV", "Member XIV"].
has thickness description: To c.161m
has upper boundary definition: The upper boundary has been defined in a number of ways. Fitton [1847] and Casey [1961] placed the boundary at the top of "Group XV", where upsection coarsening estuarine silty mudstones pass upwards into interlaminated black clays and white sands and finely overlain by the white, quartzose sands of the Sandrock Formation. Mapped lines were based on this definition. Wach and Ruffell [1990] placed the boundary within "Group XV" where the estuarine silty mudstone passes up into the interlaminated black clays and white sands. "Group XV" is a transitional bed of estuarine mudstone passing up into the estaurine sands of the Sandrock Formation. The underlying ferruginous, glauconitic sands and sandstones are essentially marine. The boundary between "Group XV" [Fitton, 1847; Casey, 1961] is a scoured erosion surface separating the estuarine mudstones from a marine sandstone with a highly burrowed and indurated top. It makes a sequence boundary. This is the current definition of the base of the unit [Insole et al., 1998; Ruffell and Watch, 1998].

Freshfield Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has source info: FRSA_52697
broader: MM

Frondderw Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: FRT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FRT
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OY
has predominant age: OY
has youngest age: OY
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42931
has lithology component: FRT MDST
has lithology component: FRT TFASST
has lithology component: FRT TFSLST
has lithology component: FRT TUF
has source info: FRT_49058
has source info: FRT_49215
has source info: FRT_50546
has source info: FRT_51351
has source info: FRT_51836
has obsolete equivalent: FRT mn 1655
broader: Ceiswyn Formation
has lower boundary definition: Lithic tuff at base conformably overlies the siltstones of the Glyn Gower Siltstone Member, within the Ceiswyn Formation.
has geographical distribution: Corwen and Bala districts, North Wales.
has lithology description: Coarse- to fine-grained rhyodacitic lithic tuff and tuffaceous sandstones and siltstones with rare fossils.
has thickness description: 2 metres. Lateral variations 0 - 17 metres.
has upper boundary definition: Tuffaceous sandstones are conformably overlain by mudstones of the Ceiswyn Formation.

Fiery Coal (In Swansea Member, South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FRYC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: FRYC COAL
has lateral equivalent: FRYC st 540
broader: SW

Firestone Sill
type: Concept
in scheme: NamedRockUnit
alternative label: FS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: FS SDST
broader: SMGP
has lithology description: Medium-grained siliceous sandstone, hard, locally either brown or white.
has thickness description: 2m to 30m; average 10m

Forres Sandstone Group
type: Concept
in scheme: NamedRockUnit
alternative label: FSA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FSa
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CT
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42932
has lithology component: FSA CONG
has lithology component: FSA LMST
has lithology component: FSA MDST
has lithology component: FSA PESST
has lithology component: FSA SDST
has lithology component: FSA SLST
has source info: FSA_48667
has obsolete equivalent: FSA mn 1557
has obsolete equivalent: FSA UORS
broader: ORS
narrower: SCAA
narrower: Elgin Calcrete Formation
narrower: Cornstone Beds (Of Inverness, Nairn, Banff)
narrower: KISA
narrower: Alves Beds
narrower: RBB
has lower boundary definition: Disconformity at base of Nairn Sandstone on Inverness Sandstone Group beds. Base is transgressive onto metamorphic basement.
has geographical distribution: Ardersier to Spey Bay (near Buckie)
has lithology description: Red-bed sandstones with rare siltstones, some pebbly beds and 'cornstones'.
has thickness description: About 1000 m thick.
has upper boundary definition: At the change in facies from red beds to marine sedimentary rocks.

Fraser Shell Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FSB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: HON

Faringdon Sponge Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FSG
has current status: CURRENT
has theme: BEDRCK
notation: FSG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KP
has predominant age: KP
has youngest age: KP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42933
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42934
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42935
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42936
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42937
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42938
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42939
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42940
has lithology component: FSG GRAV
has lithology component: FSG MDST
has lithology component: FSG SDST
has lithology component: FSG SMCCST
has source info: FSG_48752
has source info: FSG_49565
has source info: FSG_50145
has source info: FSG_50442
has source info: FSG_50869
has source info: FSG_50884
has source info: FSG_51065
has source info: FSG_51325
has source info: FSG_52514
has source info: FSG_52523
has source info: FSG_52743
has obsolete equivalent: FSG mn 1522
has obsolete equivalent: FSG mn 4158
has obsolete equivalent: FSG mn 10
broader: NE
has lower boundary definition: An erosion surface separates the sponge gravels from the underlying Jurassic Ampthill Clay and Coral Rag.
has geographical distribution: The Upper Aptian Faringdon Formation is preserved as an isolated deposit within the NW-SE orintated Faringdon Trough (Arkell, 1947), a fault controlled depression (Ruffell & Wignall, 1990) on the eroded Jurassic surface. The formation rests disconformably on the Late Jurassic between Faringdon, Fernham and Baulking (Arkell, 1947, Poole & Kelk, 1971; Poole et al., 1971).
has lithology description: The formation is composed of red and yellow sponge gravels, in the lower part of the unit, overlain by clayey sands and sandy clays and capped by ferruginous sands and sandstones. The sponge gravels are highly fossiliferous, with abundant sponges, and "the matrix is a coarse quartz sand with many small, smooth quartz and lydite bebbles" (Arkell, 1947). The "Red Gravel" shows ferruginous staining. Locally thers is a pebble bed at the base. Resting on an erosion surface, a pebble bed passes up into glauconitic sandy clays, clayey sands and silts. The clay minerals are dominantly calcium montmorillonite and illite with small amounts of Kaolinite and fuller's earth is well developed in two seams. Brown, ferruginous, cross-bedded, medium to coarse-grained sands and sandstones, resting on an erosion surface, occurs at the top of the formation. Scattered pebbles, bands of grit and cherty sandstones also occur in places. Fossil fragments are common. The top of the member is indurated to form a hard sandstone which caps a number of hills in the Abingdon district.
has thickness description: Up to an estimated 49m.
has upper boundary definition: The upper boundary of the Faringdon Formation is rarely seen. In the Uffingham Borehole and some of the Baulking boreholes, mudstones of the Gault Formation is seen to rest disconformably on the sands of the Faringdon Formation.

Fen Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: FSGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithogenesis: FLUV
has lithology component: FSGR FLNT
has lithology component: FSGR GRAV
has lithology component: FSGR LMST
has lithology component: FSGR SANDU
broader: NE
has lithology description: Gravelly sand overlying flint and limestone. [Generic description: 1:50 k map margins].

Fraser Shale
type: Concept
in scheme: NamedRockUnit
alternative label: FSH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: FSH SAPEL
broader: HON

Fernieslack Palaeosol Bed
type: Concept
in scheme: NamedRockUnit
alternative label: FSLCK
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QI
has predominant age: QI
has youngest age: QI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42942
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42941
has lithology component: FSLCK DMTN
has lithology component: FSLCK DMTNP
has source info: FSLCK_49716
has source info: FSLCK_50162
has source info: FSLCK_50626
has source info: FSLCK_50875
has source info: FSLCK_50897
has source info: FSLCK_51989
has source info: FSLCK_52002
has source info: FSLCK_52214
has source info: FSLCK_52951
has obsolete equivalent: FSLCK FSLCK
has obsolete equivalent: FSLCK mn 4339
has obsolete equivalent: FSLCK mn 193
has obsolete equivalent: FSLCK mn 2271
is obsolete equivalent of: FSLCK FSLCK
broader: ROTIL
has additional age information: Ipswichian (?MIS 5e).
has lower boundary definition: The lower boundary of the palaeosol bed is gradational (over c.0.10m) between the pedogenically modified diamicton and the relatively unaltered diamicton of the Rottenhill Till Formation.
has geographical distribution: Buchan, northeast Scotland. The palaeosol bed is only known within the immediate vicinity of Kirkhill Quarry (infilled) (centred on NK 0120 5285) and Leys Quarry (disused) (centred on NK 0040 5250) on Sheet 87W (Ellon).
has lithology description: Sandy, clayey, silty sand diamicton, brown. Interpreted as a truncated gleyed brown earth soil profile developed under temperate climate conditions. The truncated palaeosol bed represents the pedogenically modified upper c.0.80m of the Rottenhill Till Formation. Pedogenic development is indicated by the following properties: the upper 0.70m of the deposit has a strong brown colour in contrast to the lower part of the deposit which is yellowish brown. It also displays coarse mottles of yellowish red and greyish brown to brown due to Fe oxide segregation. Mafic igneous and granite clasts have been converted to gruss in situ and clay minerals show alteration from illite to mica-smectite up profile. Disrupted void argillans (evidence of clay translocation and subsequent disruption) and erect pebbles have been recorded in thin section, indicating that the palaeosol has superimposed cold climate soil features.
has thickness description: To 0.80m
has upper boundary definition: The upper boundary is a subhorizontal, planar, erosion surface overlain by gravelly sandy diamicton of the Corsend Gelifluctate Bed. The upper horizon of the palaeosol bed (not preserved) was eroded at some point prior to deposition of the gelifluctate.

First Smalley Coal (Leicester And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FSMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FSMC COAL
broader: PLCM

Felton St Mary's Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FSML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: FSML LMST
has lateral equivalent: FSML SUS
has lateral equivalent: FSML CORL
broader: ULGS
has geographical distribution: In and around the Coquet Valley, near Felton, Northumberland.
has lithology description: Ochreous-weathering, grey, bedded, crinoidal limestone.
has thickness description: c.1.8m

Foston Member
type: Concept
in scheme: NamedRockUnit
alternative label: FSTL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fst
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42943
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42944
has lithology component: FSTL FESTN
has lithology component: FSTL LMST
has lithology component: FSTL MDST
has lithology component: FSTL PHOST
has source info: FSTL_49323
has source info: FSTL_51195
has source info: FSTL_51753
has lateral equivalent: FSTL st 1
has lateral equivalent: FSTL st 310
has lateral equivalent: FSTL st 445
has obsolete equivalent: FSTL mn 1620
broader: SMD
narrower: Fenton Limestone Bed
narrower: MLLL
narrower: LGFL
narrower: Highfield Farm Limestones Bed
narrower: SGGL
narrower: LTGL
narrower: STBL
has lower boundary definition: Base of distinctively iron-rich limestone beds (Stubton Limestones), below which mudstones (Beckingham Member) contain only rare and thin limestone beds; at 34.65m depth in type section.
has geographical distribution: East Midlands Shelf; southwards the characteristic limestones pass into mudstones; northwards limestones develop in underlying Beckingham Member.
has lithology description: Grey mudstones containing laterally persistent beds of individually distinctive limestones, totalling c.10% of sequence thickness.
has thickness description: 30.07m in type section.
has upper boundary definition: In type area, at erosive base of a ferruginous bed of oolitic wackestone (Glebe Farm Bed) at the base of the Charmouth Mudstone Formation; (at 4.58m depth in type section).

Fivestanks Oil-Shale
type: Concept
in scheme: NamedRockUnit
alternative label: FSTS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
broader: NE

Froswick Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FSW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fsw
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42946
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42945
has lithology component: FSW LPTUF
has lithology component: FSW TUF
has lithology component: FSW TUFBRC
has source info: FSW_50109
has source info: FSW_50981
has source info: FSW_51563
has source info: FSW_52532
has obsolete equivalent: FSW mn 1656
has obsolete equivalent: FSW mn 1657
broader: Borrowdale Volcanic Group
has lower boundary definition: Marked by the abrupt change from bedded volcaniclastic rocks of the Mardale Formation to massive pyroclastic rocks.
has geographical distribution: Northeastern Lake District, from Kentmere to Place Fell, southeast Ullswater; Hart Fell, Haweswater; Bampton Common, Mardale Common and Wet Sleddale.
has lithology description: Eutaxitic to parataxitic, andesitic to dacitic lapilli-tuff, locally lithic rich with minor tuff-breccia and bedded tuff and lapilli-tuff.
has thickness description: To 640m
has upper boundary definition: Defined by the base of the overlying Woundale or Seathwaite Fell Sandstone formations.

Foxley Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has lithology component: FT TUF
has obsolete equivalent: FT mn 1636
broader: NA

Foot Coal (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: FTCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FTCC COAL
broader: PMCM

Fulledge Thin Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FTCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FTCO COAL
has obsolete equivalent: FTCO mn 1663
has lateral equivalent: FTCO st 340
broader: PLCM

Flow Till
type: Concept
in scheme: NamedRockUnit
alternative label: FTIL
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: FTIL NATD
broader: TILL
has lithology description: Variable lithology; glacial sediments that flow after they have been deposited by ablation. [Generic description: earth science dictionaries in the BGS library].

Flockton Thick Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FTKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FTKC COAL
has lateral equivalent: FTKC st 578
has lateral equivalent: FTKC st 25
broader: PLCM
has lithology description: The Flockton Thick Coal, or Adwalton Stone Coal is comprised of three leaves separated by dirt that in some districts preclude economic extraction. The top leaf, a cannel coal, was worked as a gas coal and for oil. The lower leaves are bituminous.

Flockton Thin Coal (West And South Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FTNC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FTNC COAL
has lateral equivalent: FTNC st 263
has lateral equivalent: FTNC st 24
broader: PLCM
has lithology description: The Flockton Thin Coal or Adwalton Black Bed Coal is a good quality dull coal with common dirt partings. It is uniform in thicknes and has been worked extensively in the area around Dewsbury and Batley.

Foot Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FTSL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: FTSL COAL
broader: NE

First Waterloo Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FTWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FTWC COAL
has lateral equivalent: FTWC GAWC
broader: PMCM
has lithology description: Name applied variably, and nomenclature needs revision.

Fort William Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FTWM
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: FTWM PSAMI
has lithology component: FTWM PSAMM
has lithology component: FTWM SEMPEL
broader: Grampian Group
narrower: LINSP

Forty Yard Coal (South Yorkshire, Nottingham And Derby)
type: Concept
in scheme: NamedRockUnit
alternative label: FTYD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FTYD COAL
broader: PLCM

Fucoid Beds Member
type: Concept
in scheme: NamedRockUnit
alternative label: FUB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: EC
has predominant age: EC
has youngest age: EC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42947
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42948
has lithology component: FUB CASLST
has lithology component: FUB DOLMST
has lithology component: FUB DSLST
has lithology component: FUB DSMDST
has lithology component: FUB LMST
has lithology component: FUB QZITE
has source info: FUB_48901
has source info: FUB_49592
has source info: FUB_49989
has source info: FUB_50473
has source info: FUB_50712
has source info: FUB_51799
has source info: FUB_52035
has source info: FUB_52639
has source info: FUB_52897
has obsolete equivalent: FUB mn 1658
has obsolete equivalent: FUB mn 1659
has obsolete equivalent: FUB mn 1660
broader: An T-Sron Formation
has lower boundary definition: Conformably overlies the Pipe Rock Member of the Eriboll Formation.
has geographical distribution: The An t-Sron Formation, including the Fucoid Beds Member, forms a narrow, discontinuous belt, extending along the North-western side of Scotland from the Durness-Eriboll area, through Assynt, Dundonnell, Kinlochewe and Kishorn, to Skye
has lithology description: Ferruginous, potash-rich brown coloured dolomitic siltstone with argillaceous, quartzose intervals, and minor limestones.
has thickness description: From 12 m to 27 m thick.
has upper boundary definition: Conformably overlain by the Salterella Grit Member.

Furnace Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: FUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FUC COAL
has source info: FUC_51867
has lateral equivalent: FUC PCRC
broader: TYLS

Furnace Coal (Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FUCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FUCL COAL
broader: NE

Furnace Coal (Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FUCY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FUCY COAL
broader: NE

Fulbeck Sand And Gravel Member
type: Concept
in scheme: NamedRockUnit
alternative label: FULB
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42949
has lithogenesis: FLUV
has lithology component: FULB C
has lithology component: FULB S
has lithology component: FULB V
has lithology component: FULB Z
has source info: FULB_49166
has source info: FULB_49170
has source info: FULB_49450
has source info: FULB_49709
has source info: FULB_50285
has source info: FULB_50409
has source info: FULB_50918
has source info: FULB_52160
has obsolete equivalent: FULB mn 1661
has obsolete equivalent: FULB GSG
has obsolete equivalent: FULB mn 3618
has obsolete equivalent: FULB mn 312
has obsolete equivalent: FULB mn 1662
has obsolete equivalent: FULB ORSG
broader: TRVA
has additional age information: Upper Pleistocene (MI Stage 5e to 4 or ?2). It was originally thought (Brandon and Sumbler, 1988) that essentially the whole of the deposit was Ipswichian but subsequently it became clear that the temperate fossiliferous deposits were local basement remnants and that the bulk of the deposit was a cold-stage aggradation. This is probably largely MIS 4, but could extend into MIS 2 (and could therefore in part correlate with the Holme Pierepont Sand and Gravel of the Trent).
has lower boundary definition: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock.
has geographical distribution: Woolsthorpe-by-Belvoir [SK 84 34] to Auborne [SK 93 63] BGS sheets:142, 143, 127, 114).
has lithology description: Predominantly cold-phase sands and gravels that underlie the Fulbeck Terrace. Typically a clean, well-sorted medium-grained sand with gravel that at depth is dominated by subangular and subrounded pebbles of Jurassic limestone (mainly Lias Group and Lincolnshire Limestone Formation), with a smaller proportion of other Jurassic lithologies, flint, "Bunter" quartz/quartzite, etc, derived from older drift deposits. Commonly appears dominated by "Bunter" and flint pebbles near the surface due to decalcification. Infills a shallow channel partly coinciding with the valley of the modern River Brant, extending northnortheastwards from Woolsthorpe to Auborne. Terrace surface falls to c.6m OD at the northern end where the deposits are covered by Brant alluvium and probably are truncated by the deeper channel of the River Witham. Sections show cryogenic involutions and epigenetic ice wedge casts infilled with coversand. Basal part locally includes channel-filling organic silts (Little Syke Bed), which yield a temperate fauna and flora assigned to MIS 5e. Correlated with Beeston Sand and Gravel Member (Trent Valley Formation), and Scarle Sand and Gravel Member (Trent Valley Formation).
has supplementary information: Partly because of misunderstandings about the age relationships, Howard (in Bowen, 1999) ascribed the downstream end of the Fulbeck Sand and Gravel (which would lie on Sheet 114) as a separate Bassingham Fen Member. The latter name is superfluous and is now subsumed into the Fulbeck Sand and Gravel.
has thickness description: 0 to c.5m; typically 1 to 2m
has upper boundary definition: Ground surface or (chiefly at northern limit) overlain by alluvium.

Fungus Coal [Coalbrookdale]
type: Concept
in scheme: NamedRockUnit
alternative label: FUN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FUN COAL
broader: PMCM
has geographical distribution: Coalbrookdale.

Funzie Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FUNC
has current status: CURRENT
has theme: BEDRCK
notation: symbol
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42950
has lithology component: FUNC MCONG
has source info: FUNC_50187
has source info: FUNC_52339
broader: UNPH
has lower boundary definition: Faulted (tectonic lens).
has geographical distribution: The eastern part of Fetlar, bound to the west by faults.
has lithology description: A conglomerate with mainly quartzite pebbles, including some pebbles of ophiolitic affinity.
has thickness description: Several kilometres thick.
has upper boundary definition: Faulted (tectonic lens).

Fallgate Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FV
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42951
has lithology component: FV BA
has lithology component: FV LMST
has lithology component: FV TUF
has source info: FV_49236
has source info: FV_52072
has source info: FV_52729
broader: PKLM
narrower: Conksbury Bridge Lava Member
narrower: LOB
has lower boundary definition: Not proven.
has geographical distribution: The eastern margin of the Derbyshire Dome, in the Peak District, around Ashover (SK 36).
has lithology description: Basaltic lavas, commonly amygdaloidal and locally brecciated, hyaloclastites and tuffs with thin beds of limestone.
has thickness description: Measured as 293m in the Fallgate Borehole, base not reached.
has upper boundary definition: Overlain conformably, with the top marked by the sharp base of the lowest bed of dark limestone, commonly containing Girvanella or Saccamminopsis of the Monsal Dale Limestone Formation.

Fiddlers Vein Coal (Pembrokeshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FVCO
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: FVCO COAL
broader: NE

Five-Feet Coal (North Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FVFC
has current status: CURRENT
has theme: BEDRCK
notation: 5-FT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FVFC COAL
broader: PMCM

Felin-Wen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FW
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FwF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: OE
has predominant age: OE
has youngest age: OE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42952
has lithology component: FW CALSST
has lithology component: FW MDST
has lithology component: FW SDST
has source info: FW_50623
has source info: FW_50787
has lateral equivalent: FW MUB
broader: NA
has lower boundary definition: Taken at the sharp incoming of silt-laminated mudstone of the Felin-wen Formation above the hemipelagic laminated and burrowed mudstone of the Aber Mawr Shales Formation. Base not observed in the Newcastle Emlyn district.
has geographical distribution: Newcastle Emlyn district, may be a synonym, in part or in full, of the Murchisoni Beds of the Carmarthen district, but further work is needed.
has lithology description: Silt-laminated mudstone with sparse, scatterd thin sandstone or calcareous sandstone beds.
has thickness description: c.70m
has upper boundary definition: Taken at the sharp incoming of tuff or tuffaceous sandstone, or locally calcareous sandstone and shelly limestone of the overlying Asaphus Ash Formation.

Felin-Wen Formation And Hendre Shales Formation (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: FWHS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: O4
broader: NA

Fawes Wood Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FWL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FWL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: CQ
has youngest age: CQ
has lithology component: FWL LMST
has lithology component: FWL MDST
has lithology component: FWL SLST
has source info: FWL_48662
has source info: FWL_51476
broader: Great Scar Limestone Group

Frances Wood Coal
type: Concept
in scheme: NamedRockUnit
alternative label: FWO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FWO COAL
broader: NE

The Forks Wash Pool Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: FWPS
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: FWPS SDST
broader: SCG
has geographical distribution: Northumberland.

Foot Of Whisky Sike Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: FWSC
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: FWSC COAL
has lateral equivalent: FWSC st 325
broader: SCG
has geographical distribution: Locally known in the area near Whisky Sike (Lewis Burn), Northumberland.
has thickness description: c.0.3m

Fawcett Coal (Northumberland)
type: Concept
in scheme: NamedRockUnit
alternative label: FWTC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: FWTC COAL
broader: NE

Fishgarth Wood Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: FWTI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42953
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42954
has lithology component: FWTI DMTN
has source info: FWTI_49633
has source info: FWTI_49657
has source info: FWTI_50151
has source info: FWTI_51342
has source info: FWTI_51754
has obsolete equivalent: FWTI mn 4336
broader: Gosforth Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: Generally planar or undulating contact on the Drigg Holme Sand Member of the Gosforth Glacigenic Formation.
has geographical distribution: 1:50k Sheet 37 Gosforth. Seascale, Ravenglass and Lower Wasdale areas, western Cumbria.
has lithology description: Typically a hard, moderate reddish brown, matrix-supported, massive, calcareous sandy silty clay diamicton, with dispersed subangular to rounded clasts up to 15cm in diameter. The clasts are mainly of red sandstone, Borrowdale Volcanic Group rocks, granite, granophyre, brown siltstone and sandstone; some coal, black shale and comminuted shell fragments.
has thickness description: Typically c.2.5m, but up to c.5m thick.
has upper boundary definition: Overlain by silts, sands and clays of the Drigg Moorside Silt Member of the Gosforth Glacigenic Formation.

Freshwater West Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FWW
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DP
broader: NE

Flexible Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: FXBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
broader: NE

Foxfield Coal (Cheadle)
type: Concept
in scheme: NamedRockUnit
alternative label: FXC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: FXC COAL
broader: PLCM

Foxdale Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: FXD
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has lithology component: FXD GN
broader: MANXG

Foxmould Member
type: Concept
in scheme: NamedRockUnit
alternative label: FXMD
has current status: CURRENT
has theme: BEDRCK
notation: Fx
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: KA
has predominant age: KA
has youngest age: KA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42955
has lithology component: FXMD CALSST
has lithology component: FXMD CLAY
has lithology component: FXMD LMST
has lithology component: FXMD SAMDST
has lithology component: FXMD SDST
has source info: FXMD_48925
has source info: FXMD_50734
has source info: FXMD_50906
has lateral equivalent: FXMD st 337
has lateral equivalent: FXMD st 338
has lateral equivalent: FXMD st 382
has obsolete equivalent: FXMD mn 1637
broader: UGS
has lower boundary definition: Unconformity resting on strata ranging from Triassic (in west) to Lower Jurassic (in east).
has geographical distribution: Devon and West Dorset. Mapped on Sheets 326 (Sidmouth) and 327 (Bridport); continuation on Sheet 311 (Wellington).
has lithology description: Sandstone, glauconitic, calcareous in part, greenish grey weathering to foxy brown sand; concretionary (doggers) and tabular sandy limestones at several levels.
has thickness description: 30-32m
has upper boundary definition: Mineralised hardground surface (Culverhole Hardground) above which concretionary calcareous sandstones are absent and cherts are common.

Ferriby Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FYCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FyCk
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42956
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42957
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42958
has lithology component: FYCK CAMDST
has lithology component: FYCK CHLK
has source info: FYCK_48936
has source info: FYCK_49494
has source info: FYCK_51362
has source info: FYCK_51523
has source info: FYCK_51678
has source info: FYCK_52412
has source info: FYCK_52668
has source info: FYCK_52893
has obsolete equivalent: FYCK mn 1539
has obsolete equivalent: FYCK mn 869
has obsolete equivalent: FYCK mn 2538
broader: Chalk Group
has lower boundary definition: Erosion surface, locally developed as a hardground, overlain by nodular chalk (lowest Cenomanian) of the Paradoxica (or Sponge) bed or, in the Cleveland Basin (e.g. Speeton) the Crowe's Shoot Member (Gaunt, G D, et al, 1992; Mitchell, S F, 1995).
has geographical distribution: Scarp area of Yorkshire and Lincolnshire Wolds, and superficial deposit-covered area to southeast, from Speeton Cliffs south to the Skegness area on the Lincolnshire coast (see Sumbler, M G, 1999, Fig.1).
has lithology description: Grey, soft, marly, flint-free chalk, typically weathering buff in exposures; locally includes pinkish bands; some harder, gritty, shell-debris-rich beds, and thin discrete marl seams. Formal subdivision: None herein but the formation includes a number of named (see Wood and Smith, 1978) units that are considered of bed status. Jeans (1980) proposed a scheme of seven members but this has not gained widespread use in the literature.
has thickness description: Typically 20-25m, thinning over the Market Weighton High (c.10-15m) but expanding into the Cleveland Basin, being c.35m in cliffs at Speeton, and c.50m inland.
has upper boundary definition: Uneven erosion surface that may be stained with iron minerals and glauconite, at the top of a succession of marly chalk (Ferriby Formation); succeeded by Plenus Marls Member (Welton Formation), a unit of marls and marly chalks that generally forms a topographical slack at outcrop, which facilitates the mapping of the Plenus Marls, and thus top of the Ferriby Formation; also readily recognized from geophysical log signature in boreholes.

Fiery Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: FYCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FYCO COAL
broader: PMCM

Foel Y Ddinas Mudstones Formation
type: Concept
in scheme: NamedRockUnit
alternative label: FYD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Fyd
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OH
has predominant age: OH
has youngest age: OH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42959
has lithology component: FYD SLMDST
has source info: FYD_49215
has obsolete equivalent: FYD mn 1605
broader: NP
narrower: Calettwr Quartzite Member
narrower: Hirnant Limestone Member
has lower boundary definition: Base succeeds grey siltstones, mudstones and thin sandstone laminae of the Moelfryn Mudstones.
has geographical distribution: Not defined.
has lithology description: Dark blue silty mudstones. Includes Calettwr Quartzite and Hirnant Limestone at the top of the formation.
has thickness description: 125 metres.
has upper boundary definition: Top - succeeded by striped dark-blue shales with subsidiary siltstones of the Cwm-yr-Aethnen Mudstones.

Fylde Halite Member
type: Concept
in scheme: NamedRockUnit
alternative label: FYHA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: TA
has predominant age: TA
has youngest age: TA
has source info: FYHA_52697
broader: LEMU

Five Yard Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: FYL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: FYL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42960
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42961
has lithology component: FYL CAMDST
has lithology component: FYL LMST
has lithology component: FYL MDST
has source info: FYL_49423
has source info: FYL_50251
has source info: FYL_50428
has source info: FYL_50534
has source info: FYL_50643
has source info: FYL_52689
has source info: FYL_52813
has source info: FYL_52902
has obsolete equivalent: FYL mn 1582
has lateral equivalent: FYL st 283
broader: Alston Formation
has lower boundary definition: Taken at the sharp base of limestone overlying measures within the Alston Formation; directly underlain by burrowed, current and ripple-bedded, medium-grained sandstone; a thin coal is present in places.
has geographical distribution: Member within the Alston Formation of the Alston and Lake District blocks in Cumbria, Northumberland and Durham, lying stratigraphically between the Scar (below) and the Three Yard (above) limestone members. Possibly correlated with the Eelwell Limestone of the Northumberland Trough. Also present in the northern part of the Askrigg Block and in the Stainmore Trough. Well exposed along the Pennine escarpment, in Teesdale and Weardale.
has lithology description: Limestone, dark grey, argillaceous, becoming grey compact towards base. In the south, fine-grained with thin evenly bedded mudstone parting with many fossils. In the north, becoming increasingly crinoidal and locally characterised by coarse crinoidal debris. Intercalated thin unit (to 2.1m) of black fossiliferous calcareous mudstone, which divides the member into two parts. Styolitic particularly near base (Johnson et al, 1996). On Dun Fell the limestone has yielded goniatites indicating the P2b biozone (Johnson and Dunham, 1963).
has thickness description: 3 to 8.5m
has upper boundary definition: Taken at base of the overlying mudstone within measures of the Alston Formation.

Fyal Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: FYLM
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Fynnon Limestones
type: Concept
in scheme: NamedRockUnit
alternative label: FYNL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DP
has predominant age: DP
has youngest age: DP
broader: NE

Flying Reed Coal (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: FYRC
has current status: CURRENT
has theme: BEDRCK
notation: Fr
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FYRC COAL
broader: PMCM

Five Yard Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: FYRD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: FYRD COAL
broader: NE

Fault Zone Rocks, Unassigned
type: Concept
in scheme: NamedRockUnit
alternative label: FZRU
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/-
has lithology component: FZRU FGOUGE
has lithology component: FZRU MYLO
broader: NA

Gisburn No.1 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: G1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: G1 LMST
broader: Chatburn Limestone Formation

Cancelloceras Cancellatum Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: G1A1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
has lithology component: G1A1 MDST
has obsolete equivalent: G1A1 mn 1695
broader: ROSSE

Unnamed Marine Band Of Cancelloceras Cumbriense Zone
type: Concept
in scheme: NamedRockUnit
alternative label: G1B
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
has lithology component: G1B MDST
broader: ROSSE

Cancelloceras Cumbriense Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: G1B1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
has lithology component: G1B1 MDST
has lateral equivalent: G1B1 SMMB
has obsolete equivalent: G1B1 mn 1185
has obsolete equivalent: G1B1 mn 1696
broader: ROSSE
broader: SMGP

Gisburn No.2 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: G2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: G2 LMST
broader: Chatburn Limestone Formation

Gisburn No.3 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: G3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: G3 LMST
broader: Chatburn Limestone Formation

Gisburn No.4 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: G4
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: G4 LMST
broader: Chatburn Limestone Formation

Gisburn No.5 Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: G5
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has lithology component: G5 LMST
broader: Chatburn Limestone Formation

Gafallt Shales Facies (Caban Conglomerate Formation)
type: Concept
in scheme: NamedRockUnit
alternative label: GA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: Ga
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42962
has lithology component: GA MDST
has lithology component: GA SDST
has source info: GA_49837
has obsolete equivalent: GA mn 1669
has obsolete equivalent: GA mn 1668
broader: Caban Conglomerate Formation
has lower boundary definition: N/A.
has geographical distribution: Central Wales.
has lithology description: Thinly interbedded turbidite mudstones and burrowed hemipelagites with scattered thin turbidite sandstones.
has thickness description: N/A.
has upper boundary definition: N/A.

Glengawna Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAA
has current status: CURRENT
has theme: BEDRCK
notation: GA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42963
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42964
has lithology component: GAA PELGP
has lithology component: GAA PSAMM
has lithology component: GAA SEMPEL
has lithology component: GAA SPGR
has source info: GAA_49400
has obsolete equivalent: GAA mn 1774
broader: SOHI
has lower boundary definition: Gradational boundary with underlying Glenelly Formation.
has geographical distribution: 0.5-1.5km wide belt in north County Tyrone, Killyclogher-Gortin Glen to Glenlark.
has lithology description: Interbedded psammite, semi-pelite and graphitic pelite.
has thickness description: c.1km
has upper boundary definition: Gradational boundary with overlying Mullaghcarn Formation.

Green Ammonite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GAB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GA
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: JE
has predominant age: JE
has youngest age: JE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42965
has lithology component: GAB LMST
has lithology component: GAB MDST
has source info: GAB_49471
has source info: GAB_49903
has source info: GAB_50891
has source info: GAB_51182
has source info: GAB_51184
has source info: GAB_51866
has source info: GAB_52641
has source info: GAB_52984
has obsolete equivalent: GAB mn 1832
has obsolete equivalent: GAB mn 4550
broader: Charmouth Mudstone Formation
has lower boundary definition: Top of Belemnite Stone (bed 121 of Lang, W D, et al, 1923). Conformable junction with Belemnite Marl Member.
has geographical distribution: Southwest Dorset, United Kingdom. Mapped on Sheet 327 (Bridport). Northern limit not yet proved.
has lithology description: Medium grey mudstones, with irregular limestones developed at three principal horizons (Lower Limestone; Red Band; and Upper Limestone). Phelps, 1985, beds 7 to 41.
has thickness description: To 31m
has upper boundary definition: Base of lowest bed of the Three Tiers Sandstone (=base of Eype Clay Member of Dyrham Formation).

Gubbin And Balls Ironstone (South Staffordshire)
type: Concept
in scheme: NamedRockUnit
alternative label: GABI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: NE

Garva Bridge Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GABR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42966
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42967
has lithology component: GABR PSAMI
has lithology component: GABR PSAMM
has lithology component: GABR SPSCH
has source info: GABR_51248
has obsolete equivalent: GABR mn 1671
broader: Glenshirra Subgroup
narrower: Gairbeinn Pebbly Psammite Member
has lower boundary definition: Not exposed.
has geographical distribution: Central Highlands of Scotland, sheet 73E, 63E, 63W, southern Monadhliath Mountains.
has lithology description: Feldspathic psammite, micaceous psammite and schistose semipelite.
has thickness description: min. 2 km.
has upper boundary definition: Sharp but conformable boundary with overlying Core nan Laogh Semipelite. Contact locally sheared, probably a disconformity.

Glenarm Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KC
has predominant age: KC
has youngest age: KC
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42968
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42970
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42969
has lithology component: GAC CHLK
has lithology component: GAC FLNT
has lithology component: GAC LMST
has source info: GAC_52106
has source info: GAC_52212
has obsolete equivalent: GAC mn 1762
has obsolete equivalent: GAC mn 1763
broader: UWLF
has additional age information: Campanian. Belemnitella mucronata Zone sensu lato
has lower boundary definition: Base delimited by a prominent weathered-out bedding plane immediately above the Altachuile Breccia (Bed) of the Ballintoy Chalk Formation.
has geographical distribution: Maximum development in the East Antrim (Midland Valley) Basin and found over the Highland Border high and well developed in the North Antrim Basin. Becomes attenuated including several non-sequences and overstepped by younger formations across the Londonderry Shelf and in the Southern Uplands Belfast district.
has lithology description: Limestone (chalk), with flints ranging from small nodular at the base through nodular to tabular flints in the middle part of the sequence to massive nodular at the top. The Formation can be divided into four `Beds? (A to D) by subdivision on bedding planes. In the North Antrim Basin the Formation includes two well-developed hardgrounds, the North Antrim Hardgrounds (of member? status) and the sequence is therefore incomplete. In the Midland Valley (East Antrim) Basin only limited wavy bedding and scattered green glauconitised pebbles indicate interrupted sedimentation. This area is regarded as the `standard?.
has thickness description: 8.10m at the type area.
has upper boundary definition: Weathered-out bedding plane below conspicuously shelly wavy-bedded chalk at the base of the conformable Garron Chalk Formation.

Garn Caws Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GACA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42971
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42972
has lithology component: GACA CONG
has lithology component: GACA MDST
has lithology component: GACA SDST
has lithology component: GACA SDSTSI
has lithology component: GACA SEATM
has source info: GACA_48805
has source info: GACA_49156
has source info: GACA_51233
has source info: GACA_51672
has source info: GACA_51840
has obsolete equivalent: GACA mn 1686
has obsolete equivalent: GACA mn 1298
has obsolete equivalent: GACA GWCL
broader: PEMB
has additional age information: ?Arundian.
has lower boundary definition: The base is placed at the base of silica-cemented ("quartzitic") sandstone or conglomerate where it rests with sharp base on an erosion surface cut in the underlying Gilwern Clay Member of the Llanelly Formation.
has geographical distribution: Northeast crop of the South Wales Coalfield, from the area of Cwar yr Hendre [SO 099 149] eastwards to the type area of Garn Caws [SO 120 164], and farther eastwards to the Clydach Valley [c.SO 215 127].
has lithology description: White, silica-cemented ("quartzitic") sandstones and conglomerates with some thin intercalated plant-bearing green-grey mudstones and seatearth.
has thickness description: To 12m (maximum at Blaen Onneu Quarry [SO 155 169].
has upper boundary definition: The top is placed at the top of the silica-cemented ("quartzitic") sandstone, where it is sharply and unconformably overlain by the basal limestone of the Dowlais Limestone Formation.

Glen Achall Psammite And Semipelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GACH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42973
has lithology component: GACH PSAMM
has lithology component: GACH SEMPEL
has source info: GACH_50473
broader: A'Mhoine Psammite Formation
has lower boundary definition: The lower boundary of the Member is defined in Glen Achall as the lowest appearance of a thick (>2m) unit of garnet-bearing semipelite above the Moine Thrust.
has geographical distribution: The Member has so far only been identified in the hills around Glen Achall, east of Ullapool, between the Rappach Water in the north and Glen Douchary in the south. However, continued mapping in the area is likely to result in it being traced for greater distances.
has lithology description: The Glen Achall Psammite and Semipelite Member comprises psammites, with abundant subsidiary semipelite beds that vary in thickness from a few centimetres to tens of metres. The psammites are grey to pink weathering and vary from tabular to cross-bedded, with bedfordms from 10cm to 1m in thickness. Semipelite beds up to a metre thick are common, but the key characteristic of this member is the presence of several garnet-bearing semipeilite units that attain several tens of metres in thickness. The semipelites are typically fine- to medium-grained and strongly foliated, consisting of quartz plus feldspar plus biotite plus muscovite plus garnet. Some of these semipelite units can be traced for several kilometres across moderately exposed ground around Glen Achall, which represents the type area for the Member, however, some of the semipelite units pinch out laterally.
has thickness description: About 200m
has upper boundary definition: The upper boundary of the Member is defined in Glen Achall as the uppermost limit of thick (>2m) garnet-bearing semipelite units. A discontinuous quartzite bed forms the very top of the Member in some outcrops. In this area, the top of the Member also represents the top of the A'Mhoine Psammite Formation.

Gartartan Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: GACO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GCO
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42974
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42975
has lithology component: GACO CONG
has lithology component: GACO PESST
has lithology component: GACO SDST
has source info: GACO_51673
has source info: GACO_52200
broader: RLF
has lower boundary definition: A sharp contact with the purple and reddish-grey, sublithic sandstone of the undivided Ruchill Flagstone Formation.
has geographical distribution: Gartmore to Lochan Balloch, north-east of which it virtually coalesces with Ben Dearg Conglomerate to form A'Chrannach Conglomerate (lower leaf) near Callander.
has lithology description: A poorly sorted, matrix supported, planar bedded, conglomerate with clasts of quartzite, quartz and igneous lithologies.
has thickness description: From 20 - 25 m between Gartmore House and Shannochill, increasing to 100 m thickness at Lochan Balloch [NN 592 043].
has upper boundary definition: A sharp contact with the Cromlix Mudstone Formation, which comprises a poorly sorted silty sandstone around Gartartan, commonly with a thin conglomerate bed 30 - 40 m above the junction. North-eastwards, basal Cromlix beds exhibit a transition to a fine-grained, massive, well-sorted sandstone, eg; at Over Shannochil [NS 5428 9930].

Garburn Dacite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GaD
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42976
has lithology component: GAD DA
has source info: GAD_52532
has obsolete equivalent: GAD mn 1681
has obsolete equivalent: GAD mn 1682
has obsolete equivalent: GAD mn 4460
broader: Borrowdale Volcanic Group
has lower boundary definition: Taken as the base of the dacite overlying volcaniclastic sandstone of the Esk Pike Formation. The two are mostly separated by later syn-BVG andesite intrusions.
has geographical distribution: On the north side of Garburn Pass, from near Limefitt Park [NY 420 033] via Garburn, Buck Crag [NY 440 048] and Piked Howes [NY 446 050] to Goat House Crag, Kentmere [NY 451 046], east of Kentmere from Stile End [NY 469 049] to South of Wray Crag [NY 476 052].
has lithology description: A flow-foliated and brecciated plagioclase-phyric dacite, interpreted as lava.
has thickness description: To 100m
has upper boundary definition: Defined by overlying sedimentary rocks of the Windermere Supergroup.

Garn Dolerite
type: Concept
in scheme: NamedRockUnit
alternative label: GADO
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: SI
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: GADO DOLR
has lithology component: GADO MCGB
has source info: GADO_50909
broader: NA
has lower boundary definition: Transgressive.
has geographical distribution: Not specified.
has lithology description: Coarse amygdaloidal microgabbro.
has thickness description: 80m
has upper boundary definition: Transgressive.

Gaerfawr Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAFA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has obsolete equivalent: GAFA mn 1667
broader: NP

Garth Grit Member
type: Concept
in scheme: NamedRockUnit
alternative label: GAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GaG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42977
has lithology component: GAG CONG
has lithology component: GAG PESST
has lithology component: GAG SDST
has source info: GAG_49435
has source info: GAG_52536
broader: Allt Lwyd Formation
has lower boundary definition: Unconformity on siltstones of Dol-cyn-Afon Formation or mudstones of Dolgellau Formation (both in Mawddach Group): forms the basal unit of the Allt Lwyd Formation.
has geographical distribution: South central Snowdonia.
has lithology description: Quartzose conglomeratic sandstone.
has thickness description: 0 to 70m
has upper boundary definition: At base of siltstones and sandstones of the undivided Allt Lwyd Formation.

Garn-Gofen Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAGO
has current status: CURRENT
has theme: BEDRCK
notation: Gago
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42978
has lithology component: GAGO CONG
has lithology component: GAGO MDST
has lithology component: GAGO SDST
has source info: GAGO_50094
has source info: GAGO_50095
has source info: GAGO_51233
has obsolete equivalent: GAGO mn 3718
broader: QCG
has lower boundary definition: Erosion surface cut in conglomerates of the Craig-y-cwm Formation, overlain by pale yellow to white micaceous sandstone [Lovell, 1978].
has geographical distribution: From Blaen Onneu - Daren Cilau area near Crickhowell, Gwent eastwards and southwards to Pontypool, Gwent, South Wales.
has lithology description: Interbedded sandstones and red-brown mudstones. The sandstones in the basal part are pale grey-green quartzites; those in the upper part are grey-green, soft, friable, richly micaceous and feldspathic.
has thickness description: Up to a maximum of 20 m.
has upper boundary definition: Sharp junction between overlying limestone of the Castell Coch Limestone of the Lower Limestone Shale Group and the topmost sandstones of the Garn-gofen Formation. A thin but persistent conglomerate marks the base of the Castell Coch Limestone.

Garth House Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAHO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SL
broader: NP

Gala Group And Hawick Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GAHW
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SW
has lithology component: GAHW CONG
has lithology component: GAHW MDST
has lithology component: GAHW SDST
has lithology component: GAHW SLMDST
has lithology component: GAHW SLST
has lithology component: GAHW WACKE
broader: NP
has lithology description: See the Lithology descriptions for the component groups.

Gairbeinn Pebbly Psammite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GAIR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42979
has lithology component: GAIR PSAMI
has lithology component: GAIR PSAMM
has lithology component: GAIR PSAP
has lithology component: GAIR PSMM
has lithology component: GAIR PSMPM
has lithology component: GAIR QZITE
has lithology component: GAIR SEMPEL
has source info: GAIR_50926
broader: Garva Bridge Psammite Formation
has lower boundary definition: Transitional, placed where feldspar clasts and pebble bands become abundant within the Garva Bridge Psammite Formation.
has geographical distribution: Western part of Monadhliath Mountains in Central Highlands. Mostly in NW part of sheet 63E [Dalwhinnie] and on sheet 73E [Foyers].
has lithology description: Pink, grey and fawn feldspathic psammite and micaceous psammite with pebbly layers, particularly towards the top of the member.
has thickness description: up to 700 m.
has upper boundary definition: Abrupt and locally transitional over a few metres. Placed where highly strained pebbly psammite, psammite and some quartzite are overlain by schistose to gneissose semipelite.

Garsdale Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CQ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has lithology component: GAL COAL
has lithology component: GAL LMST
has lithology component: GAL MDST
has lithology component: GAL SDST
has lithology component: GAL SLST
has source info: GAL_48662
has source info: GAL_51476
broader: Great Scar Limestone Group
has additional age information: Late Holkerian to early Asbian.

Gala Unit 1
type: Concept
in scheme: NamedRockUnit
alternative label: GAL1
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA1
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: SR
has youngest age: SR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42980
has lithology component: GAL1 SLMDST
has lithology component: GAL1 SLST
has lithology component: GAL1 WACKE
has source info: GAL1_49256
has source info: GAL1_49784
has source info: GAL1_50385
has source info: GAL1_52337
has source info: GAL1_52718
has lateral equivalent: GAL1 KFL
has obsolete equivalent: GAL1 mn 3444
has obsolete equivalent: GAL1 GALA
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Stair Haven Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age).
has geographical distribution: Mapped from the eastern side of Luce Bay (Sheet 4W) to New Galloway (Sheet 9W). Possible correlation with the northern part of the Donaghadee Block of the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites. Rare interbedded mudstones have yielded fauna of the acuminatus Biozone.
has thickness description: c. 2000m of near vertical strata
has upper boundary definition: Northern faulted boundary: Orlock Bridge Fault.

Gala Unit 2
type: Concept
in scheme: NamedRockUnit
alternative label: GAL2
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA2
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: SR
has youngest age: SR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42981
has lithology component: GAL2 MDST
has lithology component: GAL2 SLST
has lithology component: GAL2 WACKE
has source info: GAL2_48953
has source info: GAL2_49256
has source info: GAL2_49784
has source info: GAL2_50385
has source info: GAL2_50573
has source info: GAL2_52337
has source info: GAL2_52773
has obsolete equivalent: GAL2 GALA
has obsolete equivalent: GAL2 mn 3432
has lateral equivalent: GAL2 MDK
has obsolete equivalent: GAL2 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Sandhead Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age).
has geographical distribution: Mapped from the Sandhead on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites. Rare interbedded mudstones have yielded fauna of the acuminatus Biozone.
has thickness description: c. 1000m of near vertical strata
has upper boundary definition: Northern faulted boundary Luce Bay to New Galloway: Stair Haven Fault. East of New Galloway: Orlock Bridge Fault.

Gala Unit 3
type: Concept
in scheme: NamedRockUnit
alternative label: GAL3
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA3
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: SR
has youngest age: SR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42982
has lithology component: GAL3 MDST
has lithology component: GAL3 SLST
has lithology component: GAL3 WACKE
has source info: GAL3_48953
has source info: GAL3_49784
has source info: GAL3_50385
has source info: GAL3_50573
has source info: GAL3_52773
has lateral equivalent: GAL3 MNY
has obsolete equivalent: GAL3 GALA
has obsolete equivalent: GAL3 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Strandfoot Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to the acinaces Biozone).
has geographical distribution: Restricted to the western side around Money Head on the Rhins of Galloway (Sheet 1/3). Possible correlation with the Central Belt Turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites.
has thickness description: c. 900m of near-vertical strata
has upper boundary definition: Northern faulted boundary (Rhins of Galloway): Sandhead Fault.

Gala Unit 4
type: Concept
in scheme: NamedRockUnit
alternative label: GAL4
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA4
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42983
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42985
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42984
has lithology component: GAL4 CONG
has lithology component: GAL4 MDST
has lithology component: GAL4 SLST
has lithology component: GAL4 WACKE
has source info: GAL4_48953
has source info: GAL4_49256
has source info: GAL4_49784
has source info: GAL4_50079
has source info: GAL4_50385
has source info: GAL4_50549
has source info: GAL4_52337
has source info: GAL4_52773
has lateral equivalent: GAL4 st 758
has obsolete equivalent: GAL4 GALA
has obsolete equivalent: GAL4 mn 2110
has obsolete equivalent: GAL4 mn 3444
has lateral equivalent: GAL4 st 759
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Gillespie Burn Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age).
has geographical distribution: Mapped from Float Bay on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24 E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportions, interpreted as turbidites. Conglomeratic beds are a feature of this unit. Siltstone interbeds yielded fauna of the cyphus to triangulatus Biozones.
has thickness description: c. 1500m of near vertical strata.
has upper boundary definition: Northern faulted boundary: Sandhead Fault.

Gala Unit 5
type: Concept
in scheme: NamedRockUnit
alternative label: GAL5
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA5
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42986
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42987
has lithology component: GAL5 CONG
has lithology component: GAL5 MDST
has lithology component: GAL5 SLST
has lithology component: GAL5 WACKE
has source info: GAL5_48953
has source info: GAL5_49256
has source info: GAL5_49784
has source info: GAL5_50385
has source info: GAL5_50549
has source info: GAL5_52337
has source info: GAL5_52773
has obsolete equivalent: GAL5 GALA
has obsolete equivalent: GAL5 mn 2110
has lateral equivalent: GAL5 GAR
has obsolete equivalent: GAL5 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: The Hooies Fault (Rhins of Galloway), Garheugh Fault (Wigtown). Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to magnus Biozone).
has geographical distribution: Mapped from Ardwell Bay on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24 E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites.
has thickness description: c. 900m of near vertical strata.
has upper boundary definition: Northern faulted boundary: Gillespie Burn Fault.

Gala Unit 6
type: Concept
in scheme: NamedRockUnit
alternative label: GAL6
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA6
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42988
has lithology component: GAL6 MDST
has lithology component: GAL6 SLST
has lithology component: GAL6 WACKE
has source info: GAL6_48953
has source info: GAL6_49784
has source info: GAL6_50385
has source info: GAL6_50549
has source info: GAL6_52337
has source info: GAL6_52773
has lateral equivalent: GAL6 st 383
has obsolete equivalent: GAL6 mn 2110
has obsolete equivalent: GAL6 GALA
has obsolete equivalent: GAL6 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: southernmost splay of Drumbreddan Bay Fault (Rhins of Galloway); Pibble Fault (Wigtown). Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to convolutus Biozone).
has geographical distribution: Mapped from Drumbreddan Bay on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24 E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites.
has thickness description: c. 600m of near-vertical strata.
has upper boundary definition: Northern faulted boundary: The Hooies Fault (Rhins of Galloway); Garheugh Fault (Kirkcowan and Wigtown).

Gala Unit 7
type: Concept
in scheme: NamedRockUnit
alternative label: GAL7
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA7
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SA
has predominant age: SA
has youngest age: SA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42990
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42989
has lithology component: GAL7 BREC
has lithology component: GAL7 MDST
has lithology component: GAL7 SLST
has lithology component: GAL7 WACKE
has source info: GAL7_48953
has source info: GAL7_49784
has source info: GAL7_50385
has source info: GAL7_50549
has source info: GAL7_52337
has source info: GAL7_52773
has lateral equivalent: GAL7 st 597
has obsolete equivalent: GAL7 mn 2108
has obsolete equivalent: GAL7 GALA
has obsolete equivalent: GAL7 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Port Logan Fault (Rhins of Galloway); Cambret Fault (Wigtown Peninsula); Laurieston Fault east of Wigtown Bay. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to sedwickii - halli Biozones).
has geographical distribution: Mapped from Port Logan Bay on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet24E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites.
has thickness description: c. 1850m of near vertical strata
has upper boundary definition: Northern faulted boundary southernmost splay of Drumbreddan Fault (Rhins of Galloway); Pibble Fault (Kirkcowan and Wigtown); Garheugh Fault (to the north-east).

Gala Unit 8
type: Concept
in scheme: NamedRockUnit
alternative label: GAL8
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA8
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SA
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42991
has lithology component: GAL8 MDST
has lithology component: GAL8 SLST
has lithology component: GAL8 WACKE
has source info: GAL8_48953
has source info: GAL8_49784
has source info: GAL8_50385
has source info: GAL8_50549
has source info: GAL8_52773
has obsolete equivalent: GAL8 GALA
has obsolete equivalent: GAL8 mn 2108
has lateral equivalent: GAL8 st 659
has obsolete equivalent: GAL8 mn 3444
broader: Gala Group
has lower boundary definition: Southern faulted boundary: Mochrum Fault (Rhins of Galloway and Wigtown Peninsula). Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to sedwickii to possible turriculatus Biozones).
has geographical distribution: Mapped from Port Logan Bay on the Rhins of Galloway (Sheet 1/3) to Wigtown (Sheet 4E). Possible correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites.
has thickness description: c. 800m of near vertical strata (Rhins)
has upper boundary definition: Northern faulted boundary: southernmost splay of Port Logan Fault (Rhins of Galloway); Cambret Fault (Kirkcowan and Wigtown).

Gala Group
type: Concept
in scheme: NamedRockUnit
alternative label: GALA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GALA
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: ST
has lithology component: GALA CONG
has lithology component: GALA MDST
has lithology component: GALA SDST
has lithology component: GALA SLST
has lithology component: GALA WACKE
has source info: GALA_48953
has source info: GALA_49784
has source info: GALA_50081
has source info: GALA_50385
has source info: GALA_50549
has source info: GALA_52337
has source info: GALA_52773
has obsolete equivalent: GALA GALA
has obsolete equivalent: GALA mn 3444
has obsolete equivalent: GALA mn 4029
is obsolete equivalent of: GALA GAL2
is obsolete equivalent of: GALA GAL3
is obsolete equivalent of: GALA GAL4
is obsolete equivalent of: GALA GAL5
is obsolete equivalent of: GALA GAL8
is obsolete equivalent of: GALA GALA
is obsolete equivalent of: GALA GAL1
is obsolete equivalent of: GALA GAL6
is obsolete equivalent of: GALA GAL7
broader: NP
narrower: Gala Unit 4 And Gala Unit 5 (Undifferentiated)
narrower: Gala Unit 1
narrower: Gala Unit 2
narrower: Gala Unit 3
narrower: Gala Unit 4
narrower: Gala Unit 5
narrower: Gala Unit 6
narrower: Gala Unit 7
narrower: Gala Unit 8
narrower: Garheugh Formation
narrower: MLN
narrower: MNY
narrower: PLN
narrower: KFL
narrower: QBY
narrower: Clanyard Formation
narrower: SIN
narrower: MDK
has lower boundary definition: Southern faulted boundary: Laurieston Fault. Stratigraphical lower boundary with underlying Moffat Shale Group [of Ordovician to Silurian (gracilis to sedwickii biozones) age.]
has geographical distribution: Mapped from the Rhins of Galloway (Sheet 1/3) to Eyemouth (Sheet 34). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
has lithology description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportions, interpreted as turbidites. Rare interbedded graptolite-bearing beds.
has thickness description: c. 6000m of near-vertical strata.
has upper boundary definition: Northern faulted boundary: Orlock Bridge Fault.

Gale Seam
type: Concept
in scheme: NamedRockUnit
alternative label: GALE
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Galloway Granitic Suite
type: Concept
in scheme: NamedRockUnit
alternative label: GALGR
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: GALGR DI
has lithology component: GALGR GN
has lithology component: GALGR GNR
broader: Caledonian Supersuite
narrower: Cairngarroch Intrusion
narrower: Carsluith Intrusion
narrower: Criffel-Dalbeattie Pluton
narrower: PCRK
narrower: Culvennan Intrusion
narrower: Ballencleuch Law Granite
narrower: KMBR
narrower: Cairnsmore Of Fleet Pluton
narrower: Glenluce Intrusion
narrower: Cheviot Pluton

Gualdswell Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: GALM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Craighall Conglomerate Formation

Glaslyn Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GALN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OH
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: SR
broader: NE

Gamma Coal (North Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GAMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GAMC COAL
broader: PMCM

Ganister Clay Coal (Northumberland And Durham)
type: Concept
in scheme: NamedRockUnit
alternative label: GANC
has current status: CURRENT
has theme: BEDRCK
notation: GC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GANC COAL
broader: PLCM

Glen App Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: GAPC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GAPC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42993
has lithology component: GAPC CONG
has lithology component: GAPC SDST
has lithology component: GAPC WACKE
has source info: GAPC_50463
has source info: GAPC_52489
broader: Corsewall Formation
has lower boundary definition: Limits are defined by the presence of pebbles, cobbles or boulders.
has geographical distribution: Not defined.
has lithology description: Boulder, cobble and pebble conglomerates with pebbly coarse-grained greywackes.
has thickness description: ~2200 metres - 0 metres.
has upper boundary definition: Limits are defined by the presence of pebbles, cobbles or boulders.

Garve Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAPS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AP
has predominant age: AP
has youngest age: AP
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42994
has lithology component: GAPS PSAMM
has source info: GAPS_48861
has source info: GAPS_50851
has source info: GAPS_52150
has obsolete equivalent: GAPS mn 399
broader: Glenfinnan Group
has lower boundary definition: Located at the Sgurr Beag Thrust Plane, which is commonly interdigitated with Lewisianoid tectonic slices. This formation is structurely the lowest Moine group unit in the Sgurr Beag Nappe.
has geographical distribution: Forms a thin, nearly continuous belt running south-west to north-east from Loch Luichart (NH383602) to Loch Coire (NH525762). South and west of Loch Luichart, it is repeated in a series of folds and thrusts; e.g.Sgurr Beag Thrust, extending to the west at Loch Bhad Ghaineamhaich (NH323590), where it terminates against the Strathconon Fault.
has lithology description: Buff to pale brown and pink, flaggy, siliceous and feldspathic psammite with micaceous partings, some heavy mineral bands and numerous streaky lenticles displaying quartzofeldspathic segregations.
has thickness description: Not recorded.
has upper boundary definition: Defined by the western edge of the Ben Wyvis Pelite Formation, with the appearance of predominantly pelitic rocks to the east. The boundary has probably been significantly tectonically modified.

Garheugh Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAR
has current status: CURRENT
has theme: BEDRCK
notation: GAR
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42995
has lithology component: GAR SDST
has lithology component: GAR WACKE
has source info: GAR_49825
broader: Gala Group
has lower boundary definition: Faulted.
has geographical distribution: Not defined.
has lithology description: Very thickly bedded massive sandstone including units of medium to thick-bedded greywackes (up to 500 metres thick).
has thickness description: Not defined.
has upper boundary definition: Faulted.

Garw Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GARC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GARC COAL
has lateral equivalent: GARC st 227
broader: SWLCM

Garwood Group
type: Concept
in scheme: NamedRockUnit
alternative label: GARD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has source info: GARD_52697
broader: NE

Glen Garry Vein Complex
type: Concept
in scheme: NamedRockUnit
alternative label: GARRY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: GARRY DI
has lithology component: GARRY GD
has lithology component: GARRY GNL
has lithology component: GARRY IBREC
has lithology component: GARRY TUFIST
broader: Argyll And Northern Highlands Granitic Suite

Garrison Sill
type: Concept
in scheme: NamedRockUnit
alternative label: GARS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
broader: NE

Garron Point Tremolitic Flag Member
type: Concept
in scheme: NamedRockUnit
alternative label: GART
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GarT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42996
has lithology component: GART CALSPL
has lithology component: GART MLMST
has lithology component: GART PSAMM
has lithology component: GART SEMPEL
has source info: GART_48670
has source info: GART_49235
has source info: GART_50001
has source info: GART_51142
has obsolete equivalent: GART mn 1691
broader: Cairnfield Calcareous Flag Formation
has lower boundary definition: Transition from dominantly bluish and purplish grey calcareous flaggy semipelite to dominantly greenish grey tremolitic lithologies.
has geographical distribution: From coast at Garron Point [NJ 5525 6700-5550 6700], as far inland as fault at [NJ 532 633], south of which it is covered by Devonian sedimentary rocks.
has lithology description: Semipelite, flaggy, calcareous and minor micaceous psammite, green with tremolitic amphibole porphyroblasts prominent in most exposures. Upper part locally contains thin, lenticular bands of metalimestone.
has thickness description: c.250 to 300m on coast section; not measurable inland.
has upper boundary definition: Sharp change from tremolitic flags to interbedded graphitic pelite, semipelite and metalimestone of Mortlach Graphitic Schist Member.

Garvald Sill
type: Concept
in scheme: NamedRockUnit
alternative label: GARV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: GARV TR
broader: MVFEL

Great Arc Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GAS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42998
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/42999
has lithology component: GAS SDST
has source info: GAS_52618
has obsolete equivalent: GAS mn 679
broader: PLCM
has lower boundary definition: The lower boundary is taken at the base of the first sandstone of a sandstone-dominated unit above the Lower Mountain Coal.
has geographical distribution: Wigan (SD 5805), Manchester (SJ 8398) and Rochdale (SD 8913) areas.
has lithology description: Sandstone, buff-grey, fine-to medium-grained, micaceous, thickly-to thinly-bedded, cross-bedded and ripple-laminated.
has thickness description: 20 m maximum thickness.
has upper boundary definition: The upper boundary is taken at the base of a mudstone-dominated succession overlying the sandstone of the Great Arc Sandstone; often coincident with the base of the seatearth underlying the Upper Foot Coal.

Garantiana Mudstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GASH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JB
has predominant age: JB
has youngest age: JB
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43000
has lithology component: GASH MDST
has source info: GASH_49488
has source info: GASH_49569
has obsolete equivalent: GASH mn 1680
broader: Bearreraig Sandstone Formation
has lower boundary definition: Abrupt lithology change from Druim an Fhurian Sandstone Formation.
has geographical distribution: Sea of the Hebrides Basin.
has lithology description: Dark mudstones and clays with rare calcareous nodules mark the commencement of the Member. North of Skye the mudstones and siltstones pass laterally into calcareous sandstones.
has thickness description: 3m
has upper boundary definition: Basinwide unconformity, overlain by mudstones of the Great Estaurine Group.

Gask Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GASK
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: SSCGR

Glenade Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GAST
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: GAST CONG
has lithology component: GAST SDST
broader: LEG

Gartocharn Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GATI
has current status: CURRENT
has theme: SPRFCL
notation: GATI
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43001
has lithology component: GATI C
has lithology component: GATI CLSH
has lithology component: GATI DMTN
has lithology component: GATI S
has lithology component: GATI V
has lithology component: GATI Z
has source info: GATI_49147
has source info: GATI_49148
has source info: GATI_50296
has source info: GATI_51103
has source info: GATI_51397
has source info: GATI_52131
broader: MVG
has additional age information: Loch Lomond Stadial.
has lower boundary definition: Unconformity or glacial deformation boundary on older Quaternary strata such as the Linwood Clay Member and the Wilderness Till Formation; also on bedrock. Complex relationships laterally with fluvioglacial and deltaic/lacustrine sediments (Drumbeg Sand and Gravel Formation and Blane Water Clay Formation) forming part of the Loch Lomond Stadial Terminal Moraine Complex in the Leven and Endrick valleys in the Loch Lomond Basin.
has geographical distribution: West central Scotland, related to ice streams sourced in the Highlands during the Loch Lomond Stadial; Loch Lomond area including the Leven and Endrick valleys, sea lochs in the northern Firth of Clyde and the Stirling area to the northwest of Callander.
has lithology description: Consists of massive silty clay with isolated pebbles, gravel and boulders, and knots of sand. It is brown or dark brownish grey with many dark sulphide patches and marine shells. It is of stiff to hard consistenct and medium to high plasticity. It contains joints and low angle thrust surfaces, some of which are polished, striated and grooved. Locally rafts and more diffuse patches of bedded clay are present.
has thickness description: Veneer to over 6m
has upper boundary definition: Unconformity below younger Quaternary strata or glacial deformation boundary. Where data are available the Gartocharn Till Formation is overlain by the Drumbeg Sand and Gravel Formation and by the Buchanan Clay Member of the Clydebank Clay Formation in the Loch Lomond area.

Gawber Coal (West Yorkshire)
type: Concept
in scheme: NamedRockUnit
alternative label: GAWC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GAWC COAL
broader: PMCM

Glen Banvie Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: GBANV
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: GBANV DI
has lithology component: GBANV GD
has lithology component: GBANV GN
broader: SSCGR

Glacial Brick Clay
type: Concept
in scheme: NamedRockUnit
alternative label: GBCY
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GBCY CLAY
has lithology component: GBCY SILT
broader: NE
has lithology description: Varies from silt to clay, commonly yellow-brown and massive; of glacial origin. [Generic description].

Garn Bach Dacite
type: Concept
in scheme: NamedRockUnit
alternative label: GBDA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: GBDA DA
has source info: GBDA_50909
broader: Carn Fadryn Suite
has lower boundary definition: Not seen.
has geographical distribution: Not specified.
has lithology description: Porphyritic dacite with phenocrysts of andesine and glomeroporphyritic plagioclase clots, rare microdioritic xenoliths, minor amounts of zircon, apatite and altered mafics in a finely recrystallized felsitic groundmass.
has thickness description: Unknown.
has upper boundary definition: Not seen.

Great Britain Superficial Deposits Supergroup
type: Concept
in scheme: NamedRockUnit
alternative label: GBG
has current status: CURRENT
has theme: BEDRCK
notation: GBG
has revision number: 1
has rock unit rank: SG
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: N1
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: Q1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43002
has lithology component: GBG CLAY
has lithology component: GBG DMTN
has lithology component: GBG GRAV
has lithology component: GBG PEAT
has lithology component: GBG SANDU
has lithology component: GBG SILT
has source info: GBG_49629
has source info: GBG_49636
has source info: GBG_50918
has source info: GBG_50947
has source info: GBG_51617
has source info: GBG_52633
has obsolete equivalent: GBG mn 1312
has obsolete equivalent: GBG mn 1814
broader: NA
narrower: SBRG
narrower: Caledonia Glacigenic Group
narrower: Castle Eden Fissure-Fill Formation
narrower: Dunwich Group
narrower: Crag Group
narrower: Britannia Catchments Group
narrower: British Coastal Deposits Group
narrower: Albion Glacigenic Group
narrower: RESID
has lower boundary definition: Generally sharp but locally gradational unconformable contact with bedrock of Neogene age and older.
has geographical distribution: The whole of Great Britain [England, Scotland and Wales], including the Isle of Man, the Scilly Isles and Scottish islands, together with adjacent offshore areas.
has lithology description: The Great Britain Superficial Deposits Supergroup embraces all natural superficial deposits cropping out in England, Scotland and Wales, and the Isle of Man. Deposits comprise diamicton [including till], sand, gravel, silt and clay.
has thickness description: To 200m in onshore Britain
has upper boundary definition: The ground surface.

Glen Bay Gabbro Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GBGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: GBGB GB
broader: STKI

Glen Bay Granite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GBGN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: GBGN GN
broader: STKI

Garibaldi Blackband Ironstone (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: GBI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GBI FEST
broader: LSC

Gubbin Ironstone [Also Known As Grains Or Chance]
type: Concept
in scheme: NamedRockUnit
alternative label: GBIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
broader: NE

Glenbuck Group
type: Concept
in scheme: NamedRockUnit
alternative label: GBK
has current status: CURRENT
has theme: BEDRCK
notation: GBK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has lithology component: GBK CONG
has lithology component: GBK MDST
has lithology component: GBK SDST
has lithology component: GBK SLST
has source info: GBK_49807
has source info: GBK_50457
has source info: GBK_51072
has source info: GBK_52143
has source info: GBK_52256
has source info: GBK_52677
broader: NE
narrower: Dovestone Redbeds Formation
narrower: PHM
narrower: Gully Redbed Formation
narrower: Fish Bed Formation
narrower: Douglas Water Arenite Formation
has lower boundary definition: Base of Parishholm Conglomerate.
has geographical distribution: Hagshaw Hills Inlier, Lanarkshire. 50k sheets 23W, 23E and 15W.
has lithology description: Conglomerates, red mudstones, grey siltstones and fine-grained sandstones with fish bed. NOTE:For Reference Sections see component formations (Gully Red Beds, Fish Bed Formation, Dovestone Red Beds, Douglas Water Arenite and Parishholm Conglomerate).
has thickness description: c. 340m
has upper boundary definition: Base of overlying Hareshaw Conglomerate.

Grainbeck Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GBKL
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: GBKL LMST
broader: Alston Formation

Grayber Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GBL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
broader: NE

Gleann Beag Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GBLS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GBLS MLMST
broader: Birchwood Semipelite Formation

Golan Burn Member
type: Concept
in scheme: NamedRockUnit
alternative label: GBM
has current status: CURRENT
has theme: BEDRCK
notation: GBM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43003
has lithology component: GBM LMST
has lithology component: GBM PEL
has lithology component: GBM PSAMM
broader: Glenelly Formation
has lower boundary definition: Conformable with normal Glenelly Formation schist below.
has geographical distribution: Owenkillen Valley, County Tyrone, Northern Ireland.
has lithology description: Impure limestone with silvery schistose semipelite and fine-grained slightly calcareous quartz-feldspar psammites.
has thickness description: 10m
has upper boundary definition: Conformably overlain by normal Glenelly Formation schist.

Glenbuck Group And Monks Water Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GBMK
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SW
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: GBMK CONG
has lithology component: GBMK MDST
has lithology component: GBMK SDST
has lithology component: GBMK SLST
broader: NE
has lithology description: See the Lithology descriptions for the component groups.

Glas Bheinn Porphyritic Dolerite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GBPD
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: GBPD DOLFS
has lithology component: GBPD MCGBFP
broader: NE

Garnel Burn Pelite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GBPE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43004
has lithology component: GBPE PEL
has lithology component: GBPE SCH
has source info: GBPE_49798
broader: Clashindarroch Formation
has lower boundary definition: Junction of magnetic biotite-andalusite schist with underlying quartzite of the Grumack Hill Quartzite Member (Blackwater Formation).
has geographical distribution: Watershed ridge on SE side of River Deveron valley between NJ 441 351 and Auchmair NJ 405 312.
has lithology description: Biotite-andalusite schist, grey, coarse-grained, highly magnetic; forms prominent "tombstone-like" outcrops.
has thickness description: To 150m
has upper boundary definition: Upper limit of coarse-grained biotite-andalusite schist outcrops and/or limit of magnetic anomaly at base of semi-pelites of Clashindarroch Formation.

Glenkiln Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GBS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GBS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43005
has lithology component: GBS CHRT
has lithology component: GBS MDST
has lithology component: GBS SLST
has source info: GBS_48841
has source info: GBS_49020
has source info: GBS_49586
has source info: GBS_51479
has source info: GBS_52489
has obsolete equivalent: GBS mn 1775
has obsolete equivalent: GBS mn 1776
broader: MFS
has lower boundary definition: Conformable on Crawford Group.
has geographical distribution: Southern Uplands of Scotland and Longford Down Inlier, Northern Ireland.
has lithology description: Black cherty hemipelagic mudstone and grey mudstone and siltstone.
has thickness description: c.20m +
has upper boundary definition: Conformably overlain by Lower Hartfell Shale Formation

Gleann Beag Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GBSC
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43006
has lithology component: GBSC LMST
has lithology component: GBSC PEL
has lithology component: GBSC PSAMM
has lithology component: GBSC SCH
has source info: GBSC_51786
has source info: GBSC_52164
has obsolete equivalent: GBSC mn 479
has obsolete equivalent: GBSC mn 1752
broader: Blair Atholl Subgroup
narrower: Carn An Daimh Transitional Member
narrower: Glen Taitneach Schist Member
narrower: Glen Lochsie Calcareous Schist Member
has lower boundary definition: Base of dominantly calcareous and graphitic rocks. Stratigraphic boundary with the underlying dominantly semipelitic Tulaichean Schist Formation.
has geographical distribution: Southern part of Sheet 65W (Braemar) and northern part of sheet 56W (Glen Shee).
has lithology description: Mostly dark metacarbonate rock and psammite with some graphitic pelite and garnet calcareous schist passing up into graphitic pelite with thin beds of metacarbonate rock.
has thickness description: To 550m
has upper boundary definition: Top of dominantly graphitic rocks below the overlying dominantly quartzite succession of the Creag Leacach Quartzite Formation.

Gair Burn Coal
type: Concept
in scheme: NamedRockUnit
alternative label: GBUC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: GBUC COAL
broader: Border Group

Glen Buck Pebbly Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GBUCK
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: BU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43007
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43008
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43009
has lithology component: GBUCK DOLMST
has lithology component: GBUCK GN
has lithology component: GBUCK MBA
has lithology component: GBUCK PELGP
has lithology component: GBUCK PSAMM
has lithology component: GBUCK QZITE
has lithology component: GBUCK SEMPEL
has source info: GBUCK_48969
has source info: GBUCK_51925
broader: Glenshirra Subgroup
has lower boundary definition: Not seen - faulted against Moine and Old Red Sandstone rocks.
has geographical distribution: Central Highlands of Scotland - Sheets 73W and 63W.
has lithology description: Quartzofeldspathic psammites (local arkosic) with semipelite, pebbly and microconglomeratic beds.
has thickness description: Up to 800 m.
has upper boundary definition: Not seen - faulted and sheared against Tarff Banded Formation. Contact defined in part by the Eilrig Shear Zone.

Glenburn Volcaniclastic Member
type: Concept
in scheme: NamedRockUnit
alternative label: GBV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GBV
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43010
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43011
has lithology component: GBV MDSLST
has lithology component: GBV SDST
has lithology component: GBV SLMDST
has source info: GBV_51103
has source info: GBV_51228
has obsolete equivalent: GBV st 362
has lateral equivalent: GBV st 362
has obsolete equivalent: GBV mn 1765
broader: Clyde Plateau Volcanic Formation
has additional age information: Mid Visean
has lower boundary definition: Seen in the Glenburn Borehole at 22.85m depth (IGS, 1981). The base is sharp and marked by a lithological change from grey, aphyric, fine-grained mugearite lava of the underlying Clyde Plateau Volcanic Formation, to reddish purple muddy siltstone.
has geographical distribution: Glen Park, Paisley, Scotland.
has lithology description: Interbedded purplish red, medium-grained sandstone, reddish purple silty mudstone and reddish purple muddy siltstone. Some of the sandstone grains are volcaniclastic.
has thickness description: Variable thickness from 5.5m in the Glenburn Borehole, to more than 30m at outcrop in Glenburn Park.
has upper boundary definition: Clearly seen at Craigie Linn Waterfall, in Glen Park, Paisley, Scotland. The top of the member is sharp and marked by a lithological change from well-bedded purple tuffs and volcaniclastic sedimentary rocks to grey plagioclase microphyric basalt lava (Jedburgh type) of the overlying Clyde Plateau Volcanic Formation, that comprises sub-angular clasts of yellowish sandstone and basalt in a fine-grained purplish grey matrix.

Greys Crags
type: Concept
in scheme: NamedRockUnit
alternative label: GC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
broader: NE

Glas Choire Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCAL
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has obsolete equivalent: GCAL mn 1740
broader: Glencoe Volcanic Formation

Glen Caladale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCALA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: GCALA BA
has lithology component: GCALA FPHAW
has lithology component: GCALA HAW
has lithology component: GCALA MUG
broader: SKYL

Gillcambon Till Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCBTI
has current status: CURRENT
has theme: SPRFCL
notation: Gc
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43012
has lithology component: GCBTI DMTN
has lithology component: GCBTI GRAV
has lithology component: GCBTI SANDU
has source info: GCBTI_49009
has source info: GCBTI_49423
has source info: GCBTI_51980
has obsolete equivalent: GCBTI mn 4206
broader: ISCG
narrower: SBPT
narrower: WIGM
has additional age information: Early Devensian.
has lower boundary definition: Uneven, unconformable on bedrock.
has geographical distribution: The Vale of Eden and the southern Solway Lowlands.
has lithology description: Extremely compact, reddish-brown, stony silty sandy clay diamicton containing clasts of red sandstone and Scottish rock types (granodiorite, granite, greywacke) in addition to Lake District volcanoclastic rocks and Carboniferous rocks.
has thickness description: To 5m
has upper boundary definition: Unconformable, planar or uneven. At the Type Section there are rip-up clasts of Gillcambon Till within the overlying grey diamicton of the Greystoke Till Formation.

Gravel Caverns Conglomerate Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GCC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: DR
has predominant age: DR
has youngest age: DR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43013
has lithology component: GCC CONG
has lithology component: GCC MDST
has source info: GCC_48932
has source info: GCC_49492
has source info: GCC_51852
has source info: GCC_51967
has source info: GCC_52642
has obsolete equivalent: GCC mn 1815
broader: Harbour Cove Slate Formation
has additional age information: Mid Frasnian to Late Frasnian.
has lower boundary definition: The relationship of the conglomerate to the enclosing mudrock is complex. Sheets and small channels occur commonly and there is considerable invasion of the enclosing mudrock by pebbles at both upper and lower contacts.
has geographical distribution: Polzeath area.
has lithology description: Greenish grey mudstone with thin black calcareous beds and beds of poorly sorted, matrix-supported conglomerate up to 1.6m thick.
has thickness description: 90m (Gauss, G A and House, M R, 1972).
has upper boundary definition: The relationship of the conglomerate to the enclosing mudrock is complex. Sheets and small channels occur commonly and there is considerable invasion of the enclosing mudrock by pebbles at both upper and lower contacts.

Ganey Coals Bed(S) (Coalbrookdale)
type: Concept
in scheme: NamedRockUnit
alternative label: GCCC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GCCC COAL
broader: PLCM

Gwscwm Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GCCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GCCO COAL
broader: RA

Glacial Channel Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GCD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GCD NATD
broader: NE
has lithology description: Variable lithology. Any infilling, by glacial deposits, of a channel formed by glacial processes. [Generic description].

Grange Crags Andesite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GCg
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43014
has lithology component: GCG AND
has source info: GCG_49452
has source info: GCG_51104
broader: Birker Fell Andesite Formation
has lower boundary definition: Flow banded andesite lava rests sharply on volcaniclastic rocks; in part rests unconformably on the Skiddaw Group (mudstones).
has geographical distribution: North Lake District near Borrowdale. (Ashness Wood to Dale Head).
has lithology description: Aphyric, fine-grained andesite lava, flow banded at base and autobrecciated at top.
has thickness description: Up to 200m
has upper boundary definition: Brecciated andesite lava overlain sharply by volcaniclastic rocks.

Great Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GCGL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/D
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43015
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43016
has lithology component: GCGL BREC
has lithology component: GCGL CONG
has lithology component: GCGL MDST
has lithology component: GCGL PESST
has lithology component: GCGL SDST
has lithology component: GCGL SLST
has source info: GCGL_48966
has source info: GCGL_49416
has source info: GCGL_51673
has source info: GCGL_51962
has source info: GCGL_52023
has source info: GCGL_52709
has lateral equivalent: GCGL st 478
has obsolete equivalent: GCGL mn 1816
has obsolete equivalent: GCGL mn 2638
has obsolete equivalent: GCGL st 478
has obsolete equivalent: GCGL mn 3398
broader: REST
has lower boundary definition: Unconformable on the Silurian and Ordovician rocks of the Southern Uplands terrane.
has geographical distribution: The Southern Uplands Terrane, Scotland, bounded by the Southern Uplands Fault to the north-west in the Dunbar - Lauder - St Abb's area,
has lithology description: Red and purple conglomerates, fine- to coarse-grained, chiefly composed of rounded greywacke pebbles and boulders in a red-brown sandstone matrix with some interbedded pebbly sandstones, thin red-brown siltstones and mudstones.
has thickness description: 120m to greater than 350m
has upper boundary definition: Not generally seen as faulted against the Devono-Carboniferous in the Dunbar area. In the St Abb's area, it is overlain by Eyemouth Volcanic Formation.

Gerrards Cross Gravel Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCGR
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QA
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43017
has lithogenesis: FLUV
has lithology component: GCGR CLAY
has lithology component: GCGR GRAV
has lithology component: GCGR SANDU
has source info: GCGR_51453
has source info: GCGR_52631
broader: Dunwich Group
has lower boundary definition: Rests unconformably on bedrock geology.
has geographical distribution: Ancestral Thames course (Vale of St. Albans).
has lithology description: Sand and gravel, locally with lenses of silt, clay or peat and organic material. [Generic description].
has thickness description: 1-10m, average 4m thick.
has upper boundary definition: At surface.

Glen Clunie Graphitic Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GCGS CALSCH
has lithology component: GCGS MLMST
has lithology component: GCGS MSDDLO
has lithology component: GCGS PEL
has lithology component: GCGS PELGP
has lithology component: GCGS PSAMM
has source info: GCGS_48864
has source info: GCGS_49437
has source info: GCGS_50001
has lateral equivalent: GCGS st 97
has obsolete equivalent: GCGS mn 1753
broader: Ballachulish Subgroup

Ganister Coal (Goyt Trough)
type: Concept
in scheme: NamedRockUnit
alternative label: GCGT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GCGT COAL
has lateral equivalent: GCGT st 525
broader: PLCM

Garibaldi Clayband Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: GCI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GCI FEST
broader: LSC

Galboly Chalk Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCK
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: KS
has predominant age: KS
has youngest age: KS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43018
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43019
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43020
has lithology component: GCK CHLK
has lithology component: GCK CLKM
has lithology component: GCK FLNT
has lithology component: GCK LMST
has source info: GCK_52106
has source info: GCK_52212
has obsolete equivalent: GCK mn 1673
broader: UWLF
has additional age information: Santonian. Uintacrinus socialis Zone (in part).
has lower boundary definition: The exact relationship with the underlying Cloghfin Sponge Formation is not certain (Fletcher, 1978 p. 8 para 2). It is taken a well-developed separation plane above which the beds contain no appreciable arenaceous `contamination?.
has geographical distribution: Known throughout the North Antrim and East Antrim Basins and part of the Southern Upland, Highland Border and northern Londonderry Shelf. Absent elsewhere.
has lithology description: Chalk, with some flint bands and `incipient flints?. Marl partings common to base with some glauconite.
has thickness description: 5.85m at its type section.
has upper boundary definition: At a prominent bedding plane (an erosion surface in part) immediately above a zone of wavy and disturbed bedding. Overlain by the Cloghastucan Chalk Formation.

Gaick Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCKP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43021
has lithology component: GCKP CALSIR
has lithology component: GCKP PSAMI
has lithology component: GCKP PSMF
has lithology component: GCKP PSMQZ
has lithology component: GCKP QZITE
has lithology component: GCKP SEMPEL
has source info: GCKP_51186
has obsolete equivalent: GCKP mn 1326
has obsolete equivalent: GCKP mn 2919
has obsolete equivalent: GCKP BRPS
broader: STEL
has lower boundary definition: Top of the Falls of Phones Semipelite Formation, where the predominant semipelite passes into predominantly feldspathic and quartzose psammites of the GaickPsammite Formation.
has geographical distribution: Strathspey to Glen Tilt and Glen Garry; widespread within the Strathtummel Basin.
has lithology description: Thick sequence of predominantly grey laminated fine-grained quartzose psammite with scattered biotite flakes and laminae. Some darker grey biotitic micaceous psammite interbeds with muscovite on partings. Calc-silicate lenses present and minor quartzite and semipelites near the base of the Formation. Most bedded units are 0.1 to 0.5m thick and some are cross-bedded
has thickness description: 1 to 2km (but difficult to be precise)
has upper boundary definition: Equivalent to the top of the Bruar Psammite Formation (Sheet 55W) i.e. the base of the Tummel Quartzite Formation, where white quartzite units predominate above the predominately psammite succession of the Gaick Psammite Formation.

Green Cleugh Siltstones
type: Concept
in scheme: NamedRockUnit
alternative label: GCL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Glen Clunie Schist Formation [Obsolete Code: Use Gcgs]
type: Concept
in scheme: NamedRockUnit
alternative label: GCLS
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has source info: GCLS_52164
broader: Ballachulish Subgroup

Glen Calcareous Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: NE

Goblin Combe Oolite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43022
has lithology component: GCO LMOOL
has source info: GCO_49355
has source info: GCO_52591
broader: Burrington Oolite Subgroup
has lower boundary definition: In the Bristol area and Broadfield Down it is taken at the incoming of ooidal limestones of the Formation above the dolomite and calcite mudstones and mudstones of the underlying Clifton Down Mudstone Formation. In the Weston-super-Mare area and Steepholm it is taken at the incoming of massive, coarse crinoidal and ooidal limestones of the Formation above the grey to dark grey, medium-bedded skeletal limestones of the High Tor Limestone Formation.
has geographical distribution: Bristol [ST 60 74], Broadfield Down [ST 50 65] and Weston-super-Mare [ST 30 60] areas. Passes northwards into the Clifton Down Mudstone Formation and southwards into the Burrington Oolite Subgroup.
has lithology description: Pale grey to grey, thick-bedded to massive, medium- to coarse-grained oolite and ooidal limestone with lenses of crinoidal limestone. Deposited in a barrier environment.
has thickness description: 15m in the Bristol area [Avon Gorge] thickening to 70m at Weston-super-Mare.
has upper boundary definition: In the Weston-super-Mare area it is taken at the incoming of the calcite mudstones of the Clifton Down Mudstone Formation above the ooidal limestones of the Formation. In the Bristol area it is taken at the incoming of calcite mudstones and skeletal limestones of the Clifton Down Limestone Formation above the ooidal limestones of the Formation.

Greenscoe Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GCOE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GSC
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43023
has lithology component: GCOE BREC
has lithology component: GCOE LPTUF
has lithology component: GCOE SLMDST
has lithology component: GCOE TUF
has source info: GCOE_48699
has source info: GCOE_49785
has source info: GCOE_49988
has source info: GCOE_51902
has obsolete equivalent: GCOE mn 2951
has obsolete equivalent: GCOE mn 2953
broader: Borrowdale Volcanic Group
has lower boundary definition: Unconformity. Erosion surface cut in Skiddaw Group.
has geographical distribution: East side of Duddon Estuary (Furness Inlier) between Green Haume (SD 221 751) and Soutergate (SD 227 813), Askam in Furness, Cumbria.
has lithology description: Interbedded sucession of silty mudstone, andesitic lapilli-tuff and tuff-breccia with andesite intrusions. The volcanic component increases up the succession.
has upper boundary definition: Unconformity. Overlain by clastic/carbonate succession of the Dent Group.

Glen Coe Quartzite Member [Redundant Code: Use Dagq]
type: Concept
in scheme: NamedRockUnit
alternative label: GCOEQ
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GCOEQ MQAREN
has obsolete equivalent: GCOEQ mn 1770
broader: LTSQ

Greenan Castle Pyroclastic Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GCP
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CI
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43024
has lithology component: GCP PYRR
has lithology component: GCP VCSR
has source info: GCP_49576
has source info: GCP_49637
has source info: GCP_51445
has source info: GCP_52049
has source info: GCP_52081
has obsolete equivalent: GCP mn 347
has obsolete equivalent: GCP mn 1838
broader: Clyde Plateau Volcanic Formation
has lower boundary definition: Where seen overlying sandstones, mudstones and cementstones of the underlying Ballagan Formation on the shore at Greenan Castle, possibly disconformable on (lithified) Ballagan Formation.
has geographical distribution: A local unit on the shore and around Greenan Castle (south of Ayr, Scotland), which dies out approximately 1km inland.
has lithology description: Bedded pyroclastic rocks and volcaniclastic sedimentary rocks comprising lithic lapilli tuffs and tuffs.
has thickness description: Thickness of 23 m at Greenan Castle in the Ayr district, yet dies out laterally.
has upper boundary definition: Unconformably overlain by mudstones and sandstones of the Lawmuir Formation on the shore at Greenan Castle.

Gwscwm Rider Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GCRC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GCRC COAL
broader: RA

Glencoe Ring Intrusions
type: Concept
in scheme: NamedRockUnit
alternative label: GCRI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
broader: Argyll And Northern Highlands Granitic Suite
narrower: Glencoe Ring Intrusions, Early Fault Intrusion
narrower: Glencoe Ring Intrusions, Main Fault Intrusion

Glencoe Ring Intrusions, Early Fault Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GCRIE
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: GCRIE DI
has lithology component: GCRIE GNR
has lithology component: GCRIE MCGDP
broader: Glencoe Ring Intrusions

Glencoe Ring Intrusions, Main Fault Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GCRIM
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has lithology component: GCRIM GN
has lithology component: GCRIM GNR
has lithology component: GCRIM MCGDP
has lithology component: GCRIM QDI
broader: Glencoe Ring Intrusions

Gisburn Cotes Beds
type: Concept
in scheme: NamedRockUnit
alternative label: GCT
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
has lithology component: GCT LMST
has lithology component: GCT MDST
broader: Chatburn Limestone Formation

Green Croft Till Member
type: Concept
in scheme: NamedRockUnit
alternative label: GCTI
has current status: CURRENT
has theme: SPRFCL
notation: GCT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43026
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43025
has lithology component: GCTI CLAY
has lithology component: GCTI DMTN
has lithology component: GCTI GRAV
has lithology component: GCTI SILT
has source info: GCTI_48926
has source info: GCTI_49633
has source info: GCTI_50151
has source info: GCTI_51310
broader: Aikbank Farm Glacigenic Formation
has lower boundary definition: Generally sharp, planar, glacitectonic, unconformable contact with dark brown clay of the Whinneyhill Coppice Clay Member of the Aikbank Farm Glacigenic Formation.
has geographical distribution: Lower Wasdale, West Cumbria, inland of the limit of ice of the Irish Sea Ice Stream during the "Gosforth Oscillation".
has lithology description: Mainly dark reddish brown (Munsell Soil) pebbly silt diamicton with interbeds of subglacially sheared pebbly sand, silt and clay. The diamicton contains clasts of igneous and metamorphic rock types from the Lake District together with some red sandstone and coal.
has thickness description: To 10m
has upper boundary definition: Sharp, unconformable contact with overlying reddish brown clay and silt of the Holmeside Clay Member of the Aikbank Farm Glacigenic Formation. Taken at the top of the uppermost bed of diamicton in the sequence.

Glencoe Caldera-Volcano Complex
type: Concept
in scheme: NamedRockUnit
alternative label: GCVC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/C
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
broader: Caledonian Supersuite
narrower: Basal Andesite Sill-Complex

Grovesend Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43027
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43028
has lithology component: GDB COAL
has lithology component: GDB LAREN
has lithology component: GDB MDST
has lithology component: GDB SDST
has lithology component: GDB SEATM
has lithology component: GDB SLST
has source info: GDB_48768
has source info: GDB_49157
has source info: GDB_49279
has source info: GDB_49693
has source info: GDB_51233
has source info: GDB_52565
has source info: GDB_52938
has obsolete equivalent: GDB mn 1868
has obsolete equivalent: GDB st 804
has obsolete equivalent: GDB mn 4070
has obsolete equivalent: GDB mn 4069
has obsolete equivalent: GDB mn 1869
broader: WAWK
narrower: MYNC
narrower: N1LC
narrower: N2LC
narrower: N3LC
narrower: Drews Coal (South Wales)
narrower: Farrington Member
narrower: MGDC
narrower: SMLR
narrower: Crawley Member
narrower: PENC
narrower: WNR
narrower: WTC
narrower: UGDC
narrower: LGDC
narrower: PRCO
narrower: PUB
narrower: RAD
narrower: LRLC
narrower: Cinderford Member
narrower: Farrington Member, Barren Red Member, Radstock Member And Publow Member (Undifferentiated)
narrower: S4FC
narrower: Burford Coal Member
narrower: Barren Red Member (Somerset)
narrower: Bryncoch Coal (South Wales)
narrower: Big Rider Coal (South Wales)
narrower: Gelli Coals (South Wales)
has lower boundary definition: The base is placed at the base of the Swansea Four-Feet Coal of the Swansea district (equivalent of the Llantwit No.3 Seam in the Pontypridd district and the Mynyddislwyn Seam east of the Taff valley), where it overlies mudstone seatearth at the top of the predominantly arenaceous Swansea Member in the Swansea district and the similar Hughes Member in the east of the coalfield. It is a conformable boundary in the west, but is assumed to be an unconformable one in the east (Woodland et al., 1957; Squirrell and Downing, 1969; Barclay, 1989). Also taken at the base of the laterally correlatable Rudge Coal in the Radstack part of the Somerset Coalfield, the High Coal of the Bristol Coalfield and the Avonmouth No.1 Coal of the Severn Coal Basin.
has geographical distribution: Small areas in the South Wales Coalfield, the Formation being preserved in the cores of synclines and fault troughs from Llanelli [SN 50 00] to Llanhilleth [SO 25 05]. Also in the Somerset, Bristol, Forest of Dean and Oxfordshire coalfields.
has lithology description: Predominantly argillaceous, comprising mudstones and siltstones, with well developed coals; minor lithic ("Pennant") sandstones; locally developed red mudstones in the type area.
has thickness description: To 426m in the South Wales Coalfield; 700m in the Oxfordshire-Berkshire coalfields.
has upper boundary definition: The Grovesend Formation is the youngest unit found in the South Wales and Forest of Dean coalfields. It is overlain unconformably by sandstones of the Sherwood Sandstone Group in the Newent Coalfield, by mudstones of the of the Mercia Mudstone Group in the Oxfordshire Coalfield and either the Sherwood Sandstone or Mercia Mudstone groups in the Bristol/Somerset Coalfields.

Gardenstown Conglomerate Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GDC
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43029
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43030
has lithology component: GDC BREC
has lithology component: GDC CONG
has lithology component: GDC SDST
has lithology component: GDC SLMDST
has source info: GDC_49235
has source info: GDC_52261
has obsolete equivalent: GDC mn 363
has obsolete equivalent: GDC FINF
has obsolete equivalent: GDC mn 4327
broader: INS
narrower: Findon Fish Bed
has lower boundary definition: Unconformity on various formations of the Early Devonian Crovie Group.
has geographical distribution: Afforck, Gamrie Bay, Quaynane, Turriff to east of Banff.
has lithology description: Conglomerate with thin lenticular sandstone and rare fish-bearing silty mudstone, e.g. Findon Fish Bed.
has thickness description: 300m+
has upper boundary definition: Top of Orcadian Old Red Sandstone sequence on the southern side of the Moray Firth east of Banff.

Gellideg Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GDCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GDCO COAL
has lateral equivalent: GDCO st 228
broader: SWLCM

Glen Doll Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: GDDI
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: GDDI DIR
has lithology component: GDDI GB
has lithology component: GDDI MZDI
has lithology component: GDDI QDI
broader: SSCGR

Glendearg Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GDE
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43031
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43032
has lithology component: GDE MDST
has lithology component: GDE SDST
has lithology component: GDE SLST
has source info: GDE_49020
has source info: GDE_49071
has source info: GDE_49784
has source info: GDE_51458
has obsolete equivalent: GDE mn 1947
has obsolete equivalent: GDE mn 3444
has obsolete equivalent: GDE mn 3448
has obsolete equivalent: GDE HWK
broader: Ettrick Group
has additional age information: Silurian, Llandovery, guerichi Biozone to spiralis Biozone.
has lower boundary definition: Faulted; no stratigraphical contact preserved.
has geographical distribution: Southern Scotland.
has lithology description: Sandstone, typically fine- to medium-grained but ranging from very fine- to coarse-grained. Generally medium- to thick-bedded over thicknesses of tens of metres interspersed with units up to few metres very thin to thin-bedded. Scattered very thick beds in some cases parallel laminated throughout. Interbedded siltstone or silty mudstone generally in thin beds. Sandstone and siltstone typically greenish grey when fresh, pale brown weathering. Distinguished from the Selcoth Formation by the occurrence of very thick beds of parallel laminated sandstone. Other distinguishing factors include the wider age range (although overlapping in lowersmost part) and no evidence of a basal stratigraphical relationship with the Moffat Shale Group. Distinguished from Eskdalemuir Formation by the occurrence of very thick beds of parallel laminated sandstone and paler, less pervasive weathering reflecting lower carbonate content of the sandstone.
has thickness description: Uncertain, may be few hundred metres to 2000m
has upper boundary definition: Faulted; no stratigraphical contact preserved.

Glen Dessary Syenite S1
type: Concept
in scheme: NamedRockUnit
alternative label: GDES1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Glen Dessary Syenite S2
type: Concept
in scheme: NamedRockUnit
alternative label: GDES2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
broader: NE

Glen Dessary Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: GDESY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: GDESY MSYL
has lithology component: GDESY MSYM
has obsolete equivalent: GDESY mn 1754
broader: NWHAP

Galdenoch Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GDF
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43033
has lithology component: GDF SLST
has lithology component: GDF WACKE
has source info: GDF_48843
has source info: GDF_49413
has source info: GDF_50582
has obsolete equivalent: GDF mn 1674
has obsolete equivalent: GDF mn 742
broader: Barrhill Group
has lower boundary definition: Interfingers with Kirkcolm Formation.
has geographical distribution: Southern Uplands of Scotland.
has lithology description: Massive wacke and siltstone turbidite sequence.
has thickness description: c.500m
has upper boundary definition: Interfingers with Kirkcolm Formation.

Danian To Ypresian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GDGY
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GD
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GY
broader: NE

Glacial Deposits, Heterogeneous
type: Concept
in scheme: NamedRockUnit
alternative label: GDH
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: NE

Glacial Deposits, Heterogeneous (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GDHI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GDHI DMTN
has lithology component: GDHI VC
broader: NE

Gordale Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GDLL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43035
has lithology component: GDLL CLAY
has lithology component: GDLL CONG
has lithology component: GDLL LMST
has source info: GDLL_50498
has source info: GDLL_52333
has obsolete equivalent: GDLL mn 2231
broader: MALM
has lower boundary definition: Taken at a conspicuous bedding plane at the base of the scar-forming pale grey, well-bedded limestone of the Gordale Limestone Member above the pale grey massive limestone of the Cove Limestone Member.
has geographical distribution: Southern part of the Askrigg Block, north of Settle, Yorkshire.
has lithology description: Scar-forming, mid to pale grey limestone, well bedded, varying from thick to very thick-bedded. Variations include fine- and medium-grained (more rarely coarse-grained) bioclastic calcarenite packstones, wackestones and subordinate grainstones, with thin conglomerates adjacent to the Middle Craven Fault. The wackestones and packstones commonly show pseudobrecciation and the grainstones are cross-bedded. Undulating palaeokarstic surfaces are present, commonly overlain by thin mudstone "clays" (bentonites). Topographically, the member forms conspicuous stepped scar features and prominent limestone pavements.
has thickness description: 94m thick in its type section at Gordale Scar, elsewhere a thickness of 70-75m is typical.
has upper boundary definition: The conformable upper boundary is drawn at the upward passage from pale grey limestones of the Gordale Limestone Member to darker grey limestone of the Lower Hawes Limestone at the base of the Alston Formation, Yoredale Group.

Gastropod Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GDLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: GDLS LMST
broader: Alston Formation
has geographical distribution: Archerbeck Borehole and adjacent area. Correlared with Scar Limestone of Cumbria.

Grigadale Microgranite Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GDMGR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: GDMGR GN
has lithology component: GDMGR MCGN
broader: Ardnamurchan Centre 2

Glendouran Breccia Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43036
has lithology component: GDN BREC
has lithology component: GDN CONG
has lithology component: GDN PESST
has lithology component: GDN SDST
has source info: GDN_49784
has obsolete equivalent: GDN mn 3898
has obsolete equivalent: GDN mn 3899
broader: Appleby Group
has lower boundary definition: Unconformity at the base of the formation overlying the Ordovician Kirkcolm Formation in Holmhead Burn [NS 8820 2082].
has geographical distribution: Small outlier, c.2-4km southsouthwest of Crawfordjohn, south Lanarkshire.
has lithology description: Mainly poorly sorted breccio-conglomerates containing clasts mainly of greywacke sandstone and siltstone. Some pebbly and gravelly sandstone interbeds.
has thickness description: c.700m
has upper boundary definition: Faulted off and not exposed, but lies towards the northeast in this local basin.

Glen Doe Psammite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDOE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: D
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43037
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43038
has lithology component: GDOE CALSIR
has lithology component: GDOE PSAMI
has lithology component: GDOE PSAMM
has lithology component: GDOE SEMPEL
has source info: GDOE_48969
has source info: GDOE_51925
has lateral equivalent: GDOE st 502
is obsolete equivalent of: GDOE LLGN
broader: Corrieyairack Subgroup
has lower boundary definition: Transitional with underlying Coire nan Laogh Semipelite Formation, contact taken at decrease of semipelite to <20% of the succession.
has geographical distribution: Northwestern part of Monadhliath Mountains, particularly in Glen Doe, Corrieyairack Pass and forest areas, and River Fechlin section and surrounding mountains.
has lithology description: Uniform turbiditic, feldspathic and micaceous psammite with thin semipelite interbeds and calc-silicate rock lenses.
has thickness description: 2500m +
has upper boundary definition: Normal conformable contact with Tarff Banded or Monadhliath Semipelite formations, taken at incoming of semipelite to >20% of the succession.

Garbh-Dhail Quartz-Gabbro Ring-Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GDQGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: RI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: GDQGB QGB
broader: Ardnamurchan Centre 2

Goodrington Member
type: Concept
in scheme: NamedRockUnit
alternative label: GDRN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DV
has predominant age: DV
has youngest age: DV
has lithology component: GDRN LMST
broader: Brixham Limestone Formation

Danian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GDRU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GD
has predominant age: GD
has youngest age: GD
broader: NE

Glen Derry Diorite
type: Concept
in scheme: NamedRockUnit
alternative label: GDRY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: GDRY DI
broader: SSCGR

Grindslow Siltstones
type: Concept
in scheme: NamedRockUnit
alternative label: GDS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CK
has predominant age: CK
has youngest age: CK
has lithology component: GDS MDST
has lithology component: GDS SLST
has obsolete equivalent: GDS mn 1860
broader: Hebden Formation

Glen Dubh Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/T
broader: NE

Glen Dye Silts Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDSI
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43039
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43041
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43040
has lithogenesis: GLACI
has lithology component: GDSI CLAY
has lithology component: GDSI SANDU
has lithology component: GDSI SILT
has source info: GDSI_50626
broader: East Grampian Glacigenic Subgroup
has lower boundary definition: Generally conformable on the Banchory Till Formation.
has geographical distribution: The East Grampian Highlands.
has lithology description: Laminated brown to olive grey silt and clay.
has thickness description: Generally 2 to 3m; 5m proved in boreholes
has upper boundary definition: Generally overlain conformably by the Lochton Sand and Gravel Formation.

Glacial Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GDU
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: GDU CLAY
has lithology component: GDU DMTN
has lithology component: GDU GRAV
has lithology component: GDU NATD
has lithology component: GDU SANDU
has lithology component: GDU SILT
has obsolete equivalent: GDU mn 1719
broader: SUPD
narrower: TEC
narrower: THN
narrower: Glacially Over-Ridden Terrain (By Readvance Ice) [See Descriptions For Limitations Of Use]
has lithology description: Variable lithology. Heterogeneous glacial deposits lacking constructional form. [Generic description: 'TMOS' Procedures].

Glacial Deposits, 1
type: Concept
in scheme: NamedRockUnit
alternative label: GDU1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GDU1 NATD
broader: NE
has lithology description: Variable lithology. Heterogeneous glacial deposits lacking constructional form; older than 'Glacial Deposits' in the same map area. [Generic description: 'TMOS' Procedures].

Glacial Deposits (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GDUI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: GDUI CLAY
has lithology component: GDUI SANDU
has lithology component: GDUI SILT
broader: NE

Goodwick Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GDV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GdV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43042
has lithology component: GDV RY
has lithology component: GDV TUF
has source info: GDV_50826
has source info: GDV_51592
has obsolete equivalent: GDV mn 4459
broader: Fishguard Volcanic Group
has lower boundary definition: Drawn at base of rhyolitic lavas and tuffs of the Goodwick Volcanic Formation where it rests conformably on pillow lavas of the Strumble Head Volcanic Formation.
has geographical distribution: 1:50,000 Sheet 209 (St.David's) and adjacent Sheet 210.
has lithology description: Rhyolite lavas and rhyolitic tuffs.
has thickness description: Up to 160 metres.
has upper boundary definition: Drawn at conformable upward passage from rhyolitic lavas and tuffs of the Goodwick Volcanic Formation to calcareous flags.

Glasgow Ell Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: GE
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GE COAL
broader: MCMS

Glas Eilean Basaltic Vent
type: Concept
in scheme: NamedRockUnit
alternative label: GEB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: GEB PYBRB
broader: Ardnamurchan Centre 2

Great Easby Clay Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GECL
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
notation: GE
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43043
has lithology component: GECL C
has lithology component: GECL S
has lithology component: GECL V
has lithology component: GECL Z
has source info: GECL_49092
has source info: GECL_50881
has source info: GECL_50918
has source info: GECL_52365
has obsolete equivalent: GECL GLLD
has lateral equivalent: GECL st 376
broader: ISCG
has additional age information: Late Devensian.
has lower boundary definition: Unconformable boundary with red diamicton of the underlying Gillcambon Till Formation, or on bedrock.
has geographical distribution: The Solway Lowlands around Carlisle.
has lithology description: Dark reddish brown clay, silt and very fine-grained sand, generally thinly laminated and locally varved. Sparse dropstones.
has thickness description: 10m or more.
has upper boundary definition: Generally a sharp, planar, or gradational glacitectonic boundary with red diamicton correlated with the Plumpe Bridge Till Member of the Gretna Till Formation.

Geordie Coal
type: Concept
in scheme: NamedRockUnit
alternative label: GECO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GECO COAL
broader: NE

Gedden Coal
type: Concept
in scheme: NamedRockUnit
alternative label: GED
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GED COAL
broader: NE

Gelli Dolerite
type: Concept
in scheme: NamedRockUnit
alternative label: GEDO
has current status: CURRENT
has theme: BEDRCK
notation: symb
has revision number: 0
has rock unit rank: SI
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has lithology component: GEDO DOLR
has lithology component: GEDO MCGB
has source info: GEDO_50909
broader: NA
has lower boundary definition: Not seen.
has geographical distribution: Not specified.
has lithology description: Amygdaloidal microgabbro.
has thickness description: To 235m
has upper boundary definition: Not seen.

Gees Coal (South Lancashire)
type: Concept
in scheme: NamedRockUnit
alternative label: GEES
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GEES COAL
broader: PLCM

Glenvale Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GEF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: DU
has predominant age: DU
has youngest age: DU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43044
has lithology component: GEF SDST
has lithology component: GEF SLMDST
has lithology component: GEF SLST
has source info: GEF_49845
has source info: GEF_50587
has source info: GEF_50815
has source info: GEF_51673
has obsolete equivalent: GEF mn 928
has lateral equivalent: GEF KBS
has obsolete equivalent: GEF mn 1780
broader: SAG
narrower: Dura Den Member
has lower boundary definition: The boundary is gradational, and is drawn at the base of the brown, yellow, red, purple or cream sandstones of the Glenvale Sandstone Formation, where it rests conformably on the red or purple pebbly sandstones of the Burnside Sandstone Formation.
has geographical distribution: The Fife and Kinross area of the Midland Valley of Scotland, sheets 40, 48 and 49.
has lithology description: Brown, red, purple, yellow and cream coloured feldspathic sandstone, commonly containing bands of red siltstone and pebbles of silty mudstone, but no siliceous pebbles.
has thickness description: Up to 350 m thick in the Lomond Hills area.
has upper boundary definition: Drawn at the probable conformable upward passage from brown, yellow, red, purple or cream sandstones of the Glenvale Formation to the white or cream sandstones of the Knox Pulpit Sandstone Formation. In the Cupar area, the Dura Den Member intervenes.

Eocene And Oligocene Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GEGO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GO
broader: NE

Glasgow Ell Index Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: GEI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GEI COAL
broader: MCMS

Glas Eilean Lava Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GEIL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GEIL
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43045
has lithology component: GEIL BA
has lithology component: GEIL LMST
has lithology component: GEIL PESST
has lithology component: GEIL SDST
has source info: GEIL_50207
has source info: GEIL_50485
has source info: GEIL_52635
has source info: GEIL_52968
has obsolete equivalent: GEIL mn 777
has obsolete equivalent: GEIL mn 2637
broader: STEW
has additional age information: K/Ar dating of the lavas gives an age of 285+/- 5Ma, approximating to the Sakmarine-Asselian stage boundary within the Lower Permian [Jin et al., 1997].
has lower boundary definition: Conglomeratic sandstone at the base of the Formation, approximately 7m thick [Pringle and Bailey, 1944], is inferred to overlie Dalradian rocks unconformably [Upton et al., 1987].
has geographical distribution: Onshore exposures on the islet of Glas Eilean and the Black Rock Skerries, and underlying the Sound of Islay between the islands of Islay and Jura, Argyll, Scotland.
has lithology description: Alkali olivine-basalt intercalated with sedimentary rocks. A basal reddish-brown conglomeratic sandstone, with clasts up to about cobble size, and red to reddish-brown fine-grained sandstone is overlain by a sequence of basalt lavas [Pringle and Bailey, 1944]. Each lave flow is less than 2m thick [Upton et al., 1987] and amygdaloidal; some flows have slaggy tops. Reddish sandstone is present as isolated lenses. Sandstone, calcareous sandstone and sandy limestone may overlie and infill fissures within the lavas [Pringle and Bailey, 1944]. The thicker lava flows occur towards the base of the succession, average flow thickness decreases upwards with increasing amount of sedimentary intercalations. The basalts are sparsely microphyric with phenocrysts mostly of olivine, plagioclase and augite [Upton et al., 1987].
has thickness description: >120m
has upper boundary definition: Overlying rocks no longer preserved.

Gelli-Grin Calcareous Ash Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GEL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: OL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43046
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43047
has lithology component: GEL TUF
has lithology component: GEL TUFT
has lithology component: GEL VCSST
has source info: GEL_49058
has source info: GEL_49215
has source info: GEL_50546
has source info: GEL_50598
has source info: GEL_51715
has obsolete equivalent: GEL mn 1703
has obsolete equivalent: GEL mn 1704
broader: OGW
narrower: PCE
narrower: Cymerig Limestone Member
has lower boundary definition: Conformably overlies the upper part of the Ceiswyn Formation in the Bala district, but might pass into the latter formation in the Cadair Idris district, where its correlative is the Craig Hen-gae Member (of the Ceiswyn Formation).
has geographical distribution: Bala and Corwen districts, North Wales.
has lithology description: Calcareous volcanaclastic sandstone, tuffs and tiffites.
has thickness description: 60m
has upper boundary definition: Conformably overlain by the black mudstones of the Nod Glas Formation, but also passes laterally into its lower part (Lockley, 1980). Also overlain unconformably by the Rhiwlas Limestone Formation.

Gelli Coals (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GELI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CD
has predominant age: CD
has youngest age: CD
has lithology component: GELI COAL
broader: Grovesend Formation

Goose Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GEM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43048
has lithology component: GEM SDST
broader: RDF
has lower boundary definition: Conformable lower contact on Drumderfit Conglomerate Member.
has geographical distribution: Not defined.
has lithology description: Red sandstone, largely of fluvial origin.
has thickness description: c. 200 metres.
has upper boundary definition: Conformable upper contact with Kellen Burn Mudstone Member.

General's Rock Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GENR
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: GENR SDST
broader: Gullane Formation

Geordie's Coal
type: Concept
in scheme: NamedRockUnit
alternative label: GEOC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GEOC COAL
broader: LSC

Eocene Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GERU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: BOTH
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GE
has predominant age: GE
has youngest age: GE
broader: NE

Glen Effock Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GES
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43050
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43049
has lithology component: GES CALSIR
has lithology component: GES PEL
has lithology component: GES PSAMG
has lithology component: GES PSAMM
has lithology component: GES QZITE
has lithology component: GES SEMPEL
has source info: GES_48815
has source info: GES_49842
has obsolete equivalent: GES mn 1755
broader: NE
has lower boundary definition: First incoming of dark, greenish, biotitic and feldspathic semipelite with layers showing high magnetic susceptibility at top of Tarfside Psammite Formation.
has geographical distribution: Arcuate belt 4-5km wide in the southern parts of Sheets 65E and 66W from c. NO 3876 to NO 6280.
has lithology description: Dominant semipelite, but with considerable psammite and pelite. Psammites micaceous but fairly massive, rarely gritty. Greenish feldspathic semipelite with high magnetic susceptibility and associated micaceous psammites locally abundant near the base of the Formation. Beds of white quartzite with specks of green mica occur, particularly near the top of the Formation. Calc-silicate rocks are extremely rare.
has thickness description: Apparently 2500m thick in Greenburn - Colmeallie area (NO5578 to NO5977), but this figure is probably inflated by tectonic thickening.
has upper boundary definition: Gradational transition with incoming of muscovite-staurolite-schist and increase in proportion of gritty psammite and decrease in proportion of greenish feldpathic semipelite at base of overlying Glen Lethnot Grit Formation.

Gortnaree Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GESM
has current status: CURRENT
has theme: BEDRCK
notation: GESM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CI
has predominant age: CI
has youngest age: CI
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43051
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43052
has lithology component: GESM LMST
has lithology component: GESM SDST
has source info: GESM_49803
broader: Ballyshannon Limestone Formation
has lower boundary definition: Conformable and abrupt; calcareous sandstones and very sandy limestones at base of member rest on 0.16m of calcareous silty shale and argillaceous limestone at top of Termon River Limestone Formation.
has geographical distribution: Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
has lithology description: Sandstone, medium grey, weathering to brown rottenstone, fine- to medium-grained, calcareous, interbedded with pale blue-grey, variably arenaceous, bioclastic, crinoidal packstone with pellets.
has thickness description: 5.3m
has upper boundary definition: Conformable and gradational; decreasing arenaceous content upwards into normal Ballyshannon Limestone Formation. Boundary located at base of blue-grey bioclastic packstones.

Great Estuarine Group
type: Concept
in scheme: NamedRockUnit
alternative label: GEST
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JB
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: JN
has lithology component: GEST LMST
has lithology component: GEST MDST
has lithology component: GEST SDST
has lithology component: GEST SLST
has source info: GEST_52637
has obsolete equivalent: GEST mn 1818
broader: NA
narrower: Elgol Sandstone Formation
narrower: LASH
narrower: Duntulm Formation
narrower: SKU
narrower: Cullaidh Shale Formation
narrower: KML
narrower: VTS

Gelli Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: GETU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
broader: Camnant Mudstone Formation

Glen Ea's Vein
type: Concept
in scheme: NamedRockUnit
alternative label: GEV
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 1
has rock unit rank: VE
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43053
has source info: GEV_49245
broader: NA
has lower boundary definition: Not defined.
has geographical distribution: Leadhills-Wanlockhead mining district.
has lithology description: Lead-zinc vein cutting Ordovician greywacke.
has thickness description: 0 - 3m
has upper boundary definition: Not defined.

Gilfach Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GFACH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GFACH COAL
broader: SWUCM

Gutterford Burn Flagstones
type: Concept
in scheme: NamedRockUnit
alternative label: GFB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
broader: NE

Glaciofluvial Ice Contact Deposits, Devensian (Welsh Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFCDW
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFCDW S
has lithology component: GFCDW V
broader: Glaciofluvial Ice Contact Deposits, Devensian

Gorllwyn-Fach Member
type: Concept
in scheme: NamedRockUnit
alternative label: GFCH
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
broader: Cerig Formation

Gosford Bay Sill
type: Concept
in scheme: NamedRockUnit
alternative label: GFDBY
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: SI
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CW
has lithology component: GFDBY GBAN
broader: LAFAS

Glaciofluvial Deltaic (And/Or Subaqueous Fan) Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFDD S
has lithology component: GFDD V
broader: Glaciofluvial Deposits
narrower: Glaciofluvial Deltaic Deposits, Devensian (Irish Sea Ice)
has lithology description: Variable lithology, typically sand and gravel; formed as glaciofluvial deltas and/or subaqueous fans. [Generic description].

Glaciofluvial Deltaic Deposits, Devensian (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFDDI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Glaciofluvial Deltaic (And/Or Subaqueous Fan) Deposits

Glaciofluvial Deposits, Devensian (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFDIS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Glaciofluvial Deposits, Mid Pleistocene
type: Concept
in scheme: NamedRockUnit
alternative label: GFDMP
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
has obsolete equivalent: GFDMP mn 1729
broader: Glaciofluvial Deposits
has additional age information: Cromerian to Oxygen Isotope Stage 6.

Glaciofluvial Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFDU
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFDU C
has lithology component: GFDU P
has lithology component: GFDU S
has lithology component: GFDU V
has lithology component: GFDU Z
has obsolete equivalent: GFDU mn 1726
broader: PGDEP
narrower: OGFD
narrower: KAMET
narrower: KAMKE
narrower: Glaciofluvial Deltaic (And/Or Subaqueous Fan) Deposits
narrower: Glaciofluvial Deposits, Mid Pleistocene
narrower: Glaciofluvial Deposits, 1
narrower: Glaciofluvial Deposits, Anglian
narrower: Glaciofluvial Deposits, Devensian
narrower: Glaciofluvial Deposits (Irish Sea Ice)
narrower: Glaciofluvial Ice Contact Deposits
narrower: Glaciofluvial Fan Deposits
narrower: Glaciofluvial Sheet And Channel Deposits
narrower: Glaciofluvial Sheet Deposits
narrower: Glaciofluvial Sand And Gravel
narrower: Glaciofluvial Sub-Glacial Deposits
narrower: Glaciofluvial Terrace Deposits
narrower: Glaciofluvial Deposits, Devensian (Welsh Ice)
has lithology description: Sand and gravel, locally with lenses of silt, clay or organic material; of glaciofluvial origin. [Generic description].

Glaciofluvial Deposits, 1
type: Concept
in scheme: NamedRockUnit
alternative label: GFDU1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFDU1 GRAV
has lithology component: GFDU1 SANDU
has obsolete equivalent: GFDU1 mn 1727
broader: Glaciofluvial Deposits
has lithology description: Sand and gravel, locally with lenses of silt, clay or organic material; of glaciofluvial origin; older than "Glaciofluvial Deposits [undifferentiated]" in the same map area. [Generic description].

Glaciofluvial Deposits, Anglian
type: Concept
in scheme: NamedRockUnit
alternative label: GFDUA
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: GFDUA GRAV
has lithology component: GFDUA SANDU
has obsolete equivalent: GFDUA mn 1730
broader: Glaciofluvial Deposits

Glaciofluvial Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFDUD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has obsolete equivalent: GFDUD mn 1731
broader: Glaciofluvial Deposits

Glaciofluvial Deposits (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFDUI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFDUI S
has lithology component: GFDUI V
has obsolete equivalent: GFDUI mn 1728
broader: Glaciofluvial Deposits

Gruney And Fethaland Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GFF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DM
has predominant age: DM
has youngest age: DM
has lithology component: GFF BREC
has lithology component: GFF CONG
has lithology component: GFF SDST
broader: SUMH

Glaciofluvial Ice Contact Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFIC
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFIC C
has lithology component: GFIC P
has lithology component: GFIC S
has lithology component: GFIC V
has lithology component: GFIC Z
broader: Glaciofluvial Deposits
broader: ICD
narrower: Glaciofluvial Ice Contact Deposits, Anglian
narrower: Glaciofluvial Ice Contact Deposits, Devensian
narrower: Glaciofluvial Ice Contact Deposits, Mid Pleistocene
has lithology description: Sand and gravel, locally with lenses of silt, clay and organic material. Moundy topography is characteristic, but flat-topped mounds are common. Glaciofluvial deposits laid down on, under or against a glacier or ice-sheet. [Generic description: 'TMOS' Procedures].

Glaciofluvial Ice Contact Deposits, Anglian
type: Concept
in scheme: NamedRockUnit
alternative label: GFICA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
has lithology component: GFICA GRAV
has lithology component: GFICA SANDU
broader: Glaciofluvial Ice Contact Deposits
has lower boundary definition: Generally unconformable on older strata.
has geographical distribution: Great Britain north of the Anglian ice limit.
has lithology description: Sand and gravel.
has thickness description: Variable.
has upper boundary definition: Variable younger strata including Anglian Till and younger deposits, through to present day, or upper surface exposed.

Glaciofluvial Ice Contact Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFICD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 1
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFICD GRAV
has lithology component: GFICD SANDU
broader: Glaciofluvial Ice Contact Deposits
narrower: Glaciofluvial Ice Contact Deposits, Devensian (Welsh Ice)
narrower: Glaciofluvial Ice Contact Deposits, Devensian (Irish Sea Ice)

Glaciofluvial Ice Contact Deposits, Devensian (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFICI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Glaciofluvial Ice Contact Deposits, Devensian

Glaciofluvial Ice Contact Deposits, Mid Pleistocene
type: Concept
in scheme: NamedRockUnit
alternative label: GFIMP
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
broader: Glaciofluvial Ice Contact Deposits
has additional age information: Cromerian to Oxygen Isotope Stage 6

Gwern Feifod Lava Member
type: Concept
in scheme: NamedRockUnit
alternative label: GFL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OG
has lithology component: GFL FELS
has source info: GFL_48748
broader: LGF
has lower boundary definition: Conformably overlies volcaniclastic blue-grey mudstone of the Llangynog Formation.
has lithology description: Flow-foliated and brecciated, vesicular felsic lava.
has thickness description: 18m
has upper boundary definition: Overlain by volcaniclastic mudstones and tuff [Gwern Feifod Tuff].

Graig Fawr Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GFLS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43054
has lithology component: GFLS DOLO
has lithology component: GFLS LMST
has source info: GFLS_49279
has source info: GFLS_52509
has obsolete equivalent: GFLS mn 2294
has obsolete equivalent: GFLS mn 3526
broader: LGHL
has additional age information: Late Asbian.
has lower boundary definition: Entry of massive "reef" limestones above well bedded Loggerheads Limestone; also passes laterally southwards into the Loggerheads Limestone, and passes laterally northwards into the Prestatyn Limestone Formation (Craven Group).
has geographical distribution: Dyserth area (SJ 06 80), North Wales.
has lithology description: Knoll reef limestones comprising highly fossiliferous, massive, pale, fine-grained, recrystallised and locally dolomitised limestones with abundant calcite-lined former cavities with internal geopetal sediment (stromatactis). Contains a rich brachiopod and goniatite fauna. During the time of late Asbian carbonate platform development in North Wales a series of knoll reefs formed along, and serve to define, the platform margin. The knoll reef facies interdigitate with platformal facies on one side, and resedimented basinal facies of the Craven Group on the other.
has thickness description: c.100m
has upper boundary definition: Massive "reef" limestones overlain by dark grey mudstones and thin argillaceous limestones of the Teilia Formation.

Glaciofluvial Fan Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFN
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Glaciofluvial Deposits
narrower: Glaciofluvial Fan Deposits, Devensian

Glaciofluvial Fan Deposits 1, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFND1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFND1 S
has lithology component: GFND1 V
broader: NE
has additional age information: Late Devensian.

Glaciofluvial Fan Deposits 2, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFND2
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFND2 S
has lithology component: GFND2 V
broader: NE
has additional age information: Late Devensian.

Glaciofluvial Fan Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFNQD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Glaciofluvial Fan Deposits

Giffnock Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GFNS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GFNS SDST
broader: ULGS
has geographical distribution: Glasgow district south of the Clyde; impersistent elsewhere. Originally named after Giffnock, 4.5 miles southsouthwest of Glasgow.

Gyfenni Wood Shale Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GFS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GFS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: SG
has predominant age: SG
has youngest age: SG
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43055
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43056
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43057
has lithology component: GFS MDST
has obsolete equivalent: GFS mn 2619
broader: NA
has lower boundary definition: Passage into undifferentiated Nantglyn Flags.
has geographical distribution: Western parts 1:50,000 map sheet 165 (Montgomery).
has lithology description: Mudstones, bedding-fissile, silty, grey-brown (when weathered); largely graptolitic hemipelagite.
has thickness description: <100m
has upper boundary definition: (SO 2135 9014) Overlain by Bailey Hill Formation which in places includes the Dingle Mudstone Member at its base.

Glaciofluvial Sheet Deposits, 1, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFS1D
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Glaciofluvial Sheet Deposits, 2, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFS2D
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Glaciofluvial Sheet Deposits, 3, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFS3D
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Glaciofluvial Sheet Deposits, 4, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFS4D
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: NE

Gutterfoot Sand Member
type: Concept
in scheme: NamedRockUnit
alternative label: GFSA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43059
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43058
has lithology component: GFSA C
has lithology component: GFSA S
has lithology component: GFSA Z
has source info: GFSA_49633
has source info: GFSA_49654
has source info: GFSA_50388
has source info: GFSA_51310
has source info: GFSA_51342
has obsolete equivalent: GFSA mn 3962
has obsolete equivalent: GFSA mn 2883
broader: Gosforth Glacigenic Formation
has additional age information: Late Devensian.
has lower boundary definition: Gradational on underlying St Bees Till Member.
has geographical distribution: 1:50k Sheets 37 Gosforth and 38 Whitehaven, western Cumbria.
has lithology description: A coarsening-upwards sequence of yellowish brown clayey silt ad silty clay, passing upwards into silty fine-grained sand and finally into fine- and medium-grained sand.
has thickness description: About 8 to 12m thick
has upper boundary definition: Unconformabley overlain by younger deposits including the reddish-brown thinly nterbedded sand, sandy silt and diamicton of the Peckmill Sand Member, How Man Till Member, and the trough cross-bedded sand and gravel of the Peel Place Sands and Gravel Member (of the Gosforth Glacigrnic Formation).

Glaciofluvial Sheet And Channel Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFSCD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSCD GRAV
has lithology component: GFSCD SANDU
has lithology component: GFSCD SILT
broader: Glaciofluvial Deposits

Glaciofluvial Sheet Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFSD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSD B
has lithology component: GFSD C
has lithology component: GFSD S
has lithology component: GFSD V
has lithology component: GFSD Z
is obsolete equivalent of: GFSD MTNSG
broader: Glaciofluvial Deposits
narrower: Glaciofluvial Sheet Deposits, 1
narrower: Glaciofluvial Sheet Deposits, 2
narrower: Glaciofluvial Sheet Deposits, 3
narrower: Glaciofluvial Sheet Deposits, Anglian
narrower: Glaciofluvial Sheet Deposits, Devensian
narrower: Glaciofluvial Sheet Deposits, Devensian (Irish Sea Ice)
narrower: Glaciofluvial Sheet Deposits, Devensian (Welsh Ice)
narrower: Glaciofluvial Sheet Deposits, Mid Pleistocene
has lithology description: Sand and gravel, locally with lenses of silt, clay or organic material; characteristic 'sandur' (sheet) and valley train form; of glaciofluvial origin. [Generic description: 'TMOS' Procedures].

Glaciofluvial Sheet Deposits, 1
type: Concept
in scheme: NamedRockUnit
alternative label: GFSD1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSD1 GRAV
has lithology component: GFSD1 SANDU
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, 2
type: Concept
in scheme: NamedRockUnit
alternative label: GFSD2
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSD2 GRAV
has lithology component: GFSD2 SANDU
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, 3
type: Concept
in scheme: NamedRockUnit
alternative label: GFSD3
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, Anglian
type: Concept
in scheme: NamedRockUnit
alternative label: GFSDA
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFSDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFSDD GRAV
has lithology component: GFSDD SANDU
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, Devensian (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFSDI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFSDI GRAV
has lithology component: GFSDI SANDU
broader: Glaciofluvial Sheet Deposits

Glaciofluvial Sheet Deposits, Devensian (Welsh Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFSDW
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFSDW S
has lithology component: GFSDW V
broader: Glaciofluvial Sheet Deposits

Great Farlow Sandstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GFSF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DA
has predominant age: DA
has youngest age: DA
broader: NE

Glaciofluvial Sand And Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: GFSG
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSG GRAV
has lithology component: GFSG SANDU
has obsolete equivalent: GFSG mn 1603
is obsolete equivalent of: GFSG BWSG
is obsolete equivalent of: GFSG KHLCH
broader: Glaciofluvial Deposits
has lithology description: Sand and gravel, locally with lenses of silt, clay and organic material; of glaciofluvial origin. [Generic description: from East Anglian data].

Glaciofluvial Sheet Deposits, Mid Pleistocene
type: Concept
in scheme: NamedRockUnit
alternative label: GFSMP
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
broader: Glaciofluvial Sheet Deposits
has additional age information: Cromerian to Oxygen Isotope Stage 6

Glen Fintaig Semipelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GFSP
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GFSP PSAMM
has lithology component: GFSP QZF
has lithology component: GFSP SEMPEL
broader: Glen Spean Subgroup

Glaciofluvial Sub-Glacial Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFSU
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFSU GRAV
has lithology component: GFSU SANDU
has obsolete equivalent: GFSU mn 1733
broader: Glaciofluvial Deposits
has lithology description: Sand and gravel, locally with lenses of silt, clay or organic material; deposited by subglacial streams. [Generic description].

Gwern Feifod Tuff Member
type: Concept
in scheme: NamedRockUnit
alternative label: GFT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OO
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: OG
has lithology component: GFT TUF
has source info: GFT_48748
broader: LGF
has lower boundary definition: Conformably overlies the felsic Gwern Feifod Lava Member [Llangynog Formation].
has lithology description: Coarse- to fine-grained welded felsic crystal lapilli tuff.
has thickness description: About 10m
has upper boundary definition: Conformably and gradationally overlain by volcaniclastic mudstones of the main part of the Llangynog Formation.

Glaciofluvial Terrace Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GFTD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFTD GRAV
has lithology component: GFTD SANDU
broader: Glaciofluvial Deposits
narrower: Glaciofluvial Terrace Deposits, 1
narrower: Glaciofluvial Terrace Deposits, 2
narrower: Glaciofluvial Terrace Deposits, 3
narrower: Glaciofluvial Terrace Deposits, 4
narrower: Glaciofluvial Terrace Deposits, Devensian
narrower: Glaciofluvial Terrace Deposits, Mid Pleistocene
has lithology description: Sand and gravel, locally with lenses of silt, clay or organic material; of glaciofluvial origin; terrace-like landform. [Generic description].

Glaciofluvial Terrace Deposits, 1
type: Concept
in scheme: NamedRockUnit
alternative label: GFTD1
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFTD1 GRAV
has lithology component: GFTD1 SANDU
broader: Glaciofluvial Terrace Deposits

Glaciofluvial Terrace Deposits, 2
type: Concept
in scheme: NamedRockUnit
alternative label: GFTD2
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GFTD2 GRAV
has lithology component: GFTD2 SANDU
broader: Glaciofluvial Terrace Deposits

Glaciofluvial Terrace Deposits, 3
type: Concept
in scheme: NamedRockUnit
alternative label: GFTD3
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43060
has lithology component: GFTD3 S
has lithology component: GFTD3 V
broader: Glaciofluvial Terrace Deposits
has supplementary information: Geomorphological terrace (3) fromed of glaciofluvial deposits. May occure in valley-floor or valley-side settings. Where flights of terraces are identified these are numbered informally (1, 2, 3, etc) in order of increasing age. Terrace 3 occurs at higher elevation, and is therefore probably older, than glaciofluvial terrace 2 (GFTD2).
has thickness description: Variable.

Glaciofluvial Terrace Deposits, 4
type: Concept
in scheme: NamedRockUnit
alternative label: GFTD4
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43061
has lithology component: GFTD4 S
has lithology component: GFTD4 V
broader: Glaciofluvial Terrace Deposits
has supplementary information: Geomorphological terrace (4) fromed of glaciofluvial deposits. May occure in valley-floor or valley-side settings. Where flights of terraces are identified these are numbered informally (1, 2, 3, etc) in order of increasing age. Terrace 4 occurs at higher elevation, and is therefore probably older, than glaciofluvial terrace 3 (GFTD3).
has thickness description: Variable.

Glaciofluvial Terrace Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GFTDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFTDD GRAV
has lithology component: GFTDD SANDU
broader: Glaciofluvial Terrace Deposits

Glaciofluvial Terrace Deposits, Mid Pleistocene
type: Concept
in scheme: NamedRockUnit
alternative label: GFTMP
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
broader: Glaciofluvial Terrace Deposits
has additional age information: Cromerian to Oxygen Isotope Stage 6.

Glaciofluvial Deposits, Devensian (Welsh Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GFUDW
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has lithology component: GFUDW S
has lithology component: GFUDW V
has obsolete equivalent: GFUDW mn 1732
broader: Glaciofluvial Deposits

Glasallt-Fawr Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GFWR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OA
has predominant age: OA
has youngest age: OA
broader: NA

Gwastaden Group
type: Concept
in scheme: NamedRockUnit
alternative label: GG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: FULLPR
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SL
has predominant age: SL
has youngest age: SL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43062
has lithology component: GG CSSST
has lithology component: GG MDST
has lithology component: GG SDST
has source info: GG_50976
has source info: GG_51082
has source info: GG_52077
broader: NE
narrower: UGG
narrower: LGG
has lower boundary definition: Drawn at the base of the Gwastaden Group where mudstones rest conformably upon shales of the Blue Black Shales Formation.
has geographical distribution: Rhayader district, Radnorshire and Breconshire.
has lithology description: Mudstones, shales, flags and grits.
has thickness description: 552 metres approximately.
has upper boundary definition: Drawn at the conformable upward passage of grits of the Gwastaden Group where it is unconformably overlain by the Caban Group.

Glen Girnock Calcareous Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GGC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GGC CALSIR
has lithology component: GGC MLMST
has lithology component: GGC PSAMM
has source info: GGC_49438
has source info: GGC_50001
has lateral equivalent: GGC st 101
broader: Easdale Subgroup
narrower: Creag Liath Pelite Member
narrower: KNSP

Gorge Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GGES
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has lithology component: GGES SDST
broader: NE

Grassington Grit
type: Concept
in scheme: NamedRockUnit
alternative label: GGF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GG
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43063
has lithology component: GGF COAL
has lithology component: GGF PESST
has lithology component: GGF SDST
has lithology component: GGF SLST
has source info: GGF_50166
has source info: GGF_50338
has source info: GGF_50498
has source info: GGF_51370
has lateral equivalent: GGF BGRT
has lateral equivalent: GGF BRNG
has obsolete equivalent: GGF mn 1811
has lateral equivalent: GGF WWG
broader: PENDL
has lower boundary definition: A sharp upward change in a conformable succession from the predominantly grey mudstone to sandstone-base of first pebbly sandstone bed above the Pendle Grit Member.
has geographical distribution: The Yorkshire Pennines to the east of the River Ribble.
has lithology description: A medium- to thickly-bedded, brownish grey, medium- to coarse-grained sandstone and pebbly sandstone, which is massive to coarse bedded; beds of siltstone can occur throughout and locally coals are developed. The unit is interpreted as a delta top sandstone.
has thickness description: From 75 to 100m
has upper boundary definition: A sharp upward change in a conformable succession from sandstone to predominantly mudstone - top of the last coarse-grained or pebbly sandstone below the synsedimentary slumped siltstones and sandstones of the Roeburndale Member.

Great Glen Fault Zone
type: Concept
in scheme: NamedRockUnit
alternative label: GGFZ
has current status: CURRENT
has theme: BEDRCK
has unit class: LDTM
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: MZ
has lithology component: GGFZ BREC
has lithology component: GGFZ CAT
has lithology component: GGFZ FGOUGE
has lithology component: GGFZ MYLO
broader: NA

Gallagh Bridge Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GGH
has current status: CURRENT
has theme: BEDRCK
notation: GGH
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: PU
has predominant age: PU
has youngest age: PU
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43064
has lithology component: GGH MDST
has lithology component: GGH SDST
has lithology component: GGH SLST
has source info: GGH_50816
has obsolete equivalent: GGH mn 3298
broader: Belfast Group
has lower boundary definition: Sharp contact with white dolomitic limestone of the underlying Magnesian Limestone Formation.
has geographical distribution: Sub-surface on northwest shore of Lough Neagh.
has lithology description: Sandstone, red, fine-to-medium-grained, dolomite cement; thin layers of red siltstone and mudstone, brown mudstone up to 15%.
has thickness description: 26.9 - 50.3m [88 - 165ft]
has upper boundary definition: Gradational but rapid decrease in cemented sandstone and increase of red mudstone and siltstones in the overlying Drumderg House Formation [formerly known as Permian Upper Marls].

Greengate Well Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GGL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: GGL CAMDST
has lithology component: GGL LMST
has source info: GGL_51867
has lateral equivalent: GGL st 736
has lateral equivalent: GGL PNLS
broader: Alston Formation
has lithology description: Pale grey compact even-bedded limestone and subordinate shaly calcareous mudstone.
has thickness description: c.10m maximum, thinning eastwards to about 5m; locally split by c.1.5m of calcareous shaly mudstone.

Goat Gills Member
type: Concept
in scheme: NamedRockUnit
alternative label: GGM
has current status: CURRENT
has theme: BEDRCK
notation: GGM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43065
has lithology component: GGM BREC
has source info: GGM_50420
broader: Buttermere Formation
has lower boundary definition: Base not seen.
has geographical distribution: Not defined.
has lithology description: Breccia, mainly of siltstone in a siltstone matrix.
has thickness description: Approx. 100 metres.
has upper boundary definition: Top sharp with overlying (inverted sequence) Robinson Member.

Gun Gardens Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: GGMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: Holywell Nodular Chalk Formation

Gun Gardens Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: GGMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: Holywell Nodular Chalk Formation

Gun Gardens Marls (Three)
type: Concept
in scheme: NamedRockUnit
alternative label: GGMA3
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: Holywell Nodular Chalk Formation

Glyngwilym Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GGMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GGMC COAL
broader: Brithdir Member

Gun Gardens Main Marl
type: Concept
in scheme: NamedRockUnit
alternative label: GGMM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: NPCH

Glen Gairn Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: GGN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: SU
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: DL
has lithology component: GGN GN
broader: Cairngorm Granitic Suite
has additional age information: From Rb-Sr whole rock isochron ages: 404 +/- 6Ma, equivalent to Pridoli to Lochkovian (Harland et al, 1990), or Praghian to Emsian (Gradstein and Ogg). Taken as Ludlow to Early Devonian for convenience.

Glen Gour Quartzite And Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GGQP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GGQP HBSCH
has lithology component: GGQP PELGN
has lithology component: GGQP QZITE
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M

Glen Gloy Quartzite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GGQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GGQU QZF
broader: Glen Spean Subgroup

Green Grove Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: GGS SDST
broader: Border Group

Gorpley Grit
type: Concept
in scheme: NamedRockUnit
alternative label: GGT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CZ
has predominant age: CZ
has youngest age: CZ
has lithology component: GGT SDST
is obsolete equivalent of: GGT FLB
broader: MARSD

Gwern Gof Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GGTU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GGT
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O4
has predominant age: O4
has youngest age: O4
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/43067
has lithology component: GGTU TUF
has lithology component: GGTU VCSST
has source info: GGTU_49974
has source info: GGTU_50521
broader: LLV
has lower boundary definition: Rests on sandstones and mudstones intercalated in the Llewelyn Volcanic Group above the Foel Fras Volcanic Complex.
has geographical distribution: East of Carnedd Dafydd to east of Tryfan.
has lithology description: Non- to weakly-welded acidic ash-flow tuffs with cross-laminated, well-bedded tuffaceous sandstone derived from the tuffs.
has thickness description: About 30m
has upper boundary definition: Underlies sandstone and siltstone in the Llewelyn Volcanic Group that underlies the Capel Curig Volcanic Formation..

Glass Houghton Rock
type: Concept
in scheme: NamedRockUnit
alternative label: GH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GH SDST
has lithology component: GH SLST
has obsolete equivalent: GH mn 2039
broader: PMCM
has geographical distribution: West/south Yorkshire, especially between Castleford and Sharlston [Glass Houghton, near Castleford, Yorkshire].
has lithology description: Brown and grey micaceous sandstone.
has thickness description: 30m in Glass Houghton area; known to 42m in borehole cores.

Great House Agglomerate
type: Concept
in scheme: NamedRockUnit
alternative label: GHAG
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/V
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: GHAG AGG
has source info: GHAG_49871
has source info: GHAG_51890
has source info: GHAG_52795
broader: NA
has additional age information: Unconfirmed, but deduced as "Early Carboniferous" (Welch and Trotter, 1960).

Garth Hill Beds
type: Concept
in scheme: NamedRockUnit
alternative label: GHB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
broader: NE

Gibbet Hill Conglomerate Bed
type: Concept
in scheme: NamedRockUnit
alternative label: GHC
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: PL
has predominant age: PL
has youngest age: PL
has lithology component: GHC CONG
has source info: GHC_49789
has obsolete equivalent: GHC mn 1707
broader: KHS

Grain Heads Siltstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GHD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GHD
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: ST
has predominant age: ST
has youngest age: ST
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40696
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40697
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40698
has lithology component: GHD CLAY
has lithology component: GHD SDST
has lithology component: GHD SLMDST
has lithology component: GHD SLST
has source info: GHD_48654
has source info: GHD_49222
has source info: GHD_49223
has source info: GHD_49784
has source info: GHD_50454
has source info: GHD_51092
has source info: GHD_51262
has source info: GHD_51491
has obsolete equivalent: GHD mn 353
has obsolete equivalent: GHD mn 359
has obsolete equivalent: GHD mn 2627
has obsolete equivalent: GHD mn 4319
has obsolete equivalent: GHD mn 2643
has obsolete equivalent: GHD mn 2641
broader: WLN
has lower boundary definition: Conformable: green-grey bioturbated mudstones immediately overlying medium- to coarse-grained sandstones of the Cock Rig Formation.
has geographical distribution: Pentland Hills, Midland Valley.
has lithology description: Highly fossiliferous silty mudstones, siltstones and fine-grained sandstones.
has thickness description: 30-55m
has upper boundary definition: Conformable: highest laminated sandy siltstones and fine-grained sandstones with abundant bioclasts on bedding planes, below Lamb Rig Siltstone Member.

Garabal Hill - Glen Fyne Pluton
type: Concept
in scheme: NamedRockUnit
alternative label: GHGFP
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/P
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/S
has lithology component: GHGFP GD
has lithology component: GHGFP GN
broader: SSCGR

Great House Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GHIN
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: GHIN MONCHQ
has source info: GHIN_49871
has source info: GHIN_52527
has source info: GHIN_52795
broader: NA
has additional age information: Unconfirmed, but deduced as "Early Carboniferous" (Welch and Trotter, 1960).

Grumack Hill Quartzite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GHQU
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40699
has lithology component: GHQU PSAMM
has lithology component: GHQU QZITE
has source info: GHQU_49798
broader: Blackwater Formation
has lower boundary definition: Junction with underlying pelites (Corinacy Pelite Member).
has geographical distribution: NW flank of watershed ridge (including Grumack Hill) on the SE side of the River Deveron Valley, between NJ 448 355 and Hill of Bank (NJ 388 290) NB The outcrop does not include the actual summit of Grumack Hill.
has lithology description: Quartzite, buff, grey to off-white and gritty psammite.
has thickness description: c. 400m
has upper boundary definition: Junction with overlying, highly magnetic biotite-andalusite-schist (Garnel Burn Pelite Member of the Clashindarroch Formation).

Gorse Hall Rock
type: Concept
in scheme: NamedRockUnit
alternative label: GHR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
broader: PLCM

Grinshill Sandstone
type: Concept
in scheme: NamedRockUnit
alternative label: GHSA
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: NE

Garleton Hills Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GHV
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GHV
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CV
has predominant age: CV
has youngest age: CV
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40700
has lithology component: GHV BALAVA
has lithology component: GHV BAPOCM
has lithology component: GHV BAROCM
has lithology component: GHV BARPMA
has lithology component: GHV BATUF
has lithology component: GHV BRPOCM
has lithology component: GHV LAVA
has lithology component: GHV LMST
has lithology component: GHV MUG
has lithology component: GHV SR
has lithology component: GHV TRBA
has lithology component: GHV TRTUF
has lithology component: GHV VLSS
has source info: GHV_49416
has source info: GHV_51455
has obsolete equivalent: GHV mn 1685
broader: SYG
narrower: East Linton Lava Member
narrower: Bangley Trachytic Member
narrower: NBPY
narrower: HSLA
has additional age information: Early Visean.
has lower boundary definition: Base of volcanic rocks resting on sedimentary rocks of Inverclyde Group (Ballagan Formation).
has geographical distribution: Little known; thins in all directions.
has lithology description: Basaltic and trachytic lavas and tuffs predominate; but subordinate volcanic-derived sedimentary rocks also occur.
has thickness description: 380m in Garleton Hills (240m at North Berwick; 257m in Spilmersford Borehole).
has upper boundary definition: Top of volcanic rocks below sedimentary rocks of Gullane Formation.

Glur-Bheinn Member
type: Concept
in scheme: NamedRockUnit
alternative label: GIBH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GIBH QZITE
broader: Bonahaven (Bunnahabhain) Dolomite Formation

Garibaldi Coal (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: GIC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GIC COAL
broader: LSC

Gillers Inn Coal (Bristol Area)
type: Concept
in scheme: NamedRockUnit
alternative label: GICO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GICO COAL
broader: SWMCM

Gillis Field Microporphyroblast Gneiss Member
type: Concept
in scheme: NamedRockUnit
alternative label: GIFG
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GIFG CALSIR
has lithology component: GIFG PSMGN
broader: Burra Firth Formation

Gilmerton Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: GIIR
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has lithology component: GIIR FEST
has source info: GIIR_51867
broader: LLGS
has geographical distribution: The Midlothian "basin" - specifically around Gilmerton.
has lithology description: A "blackband" ironstone, lov=cally containing fish remains.
has supplementary information: The bed, which is in the sequence above the Gilmerton (Hurlet) and below the North Greens limestones, was formerly worked.
has thickness description: 0.3m

Gillespie Coal (Lothian)
type: Concept
in scheme: NamedRockUnit
alternative label: GILC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GILC COAL
broader: LSC

Gill Coal (Douglas)
type: Concept
in scheme: NamedRockUnit
alternative label: GILL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: GILL COAL
broader: ULGS

Gilnahirk Group
type: Concept
in scheme: NamedRockUnit
alternative label: GILN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has obsolete equivalent: GILN mn 1711
broader: NE
narrower: Helen's Bay Formation

Gin Head Vent
type: Concept
in scheme: NamedRockUnit
alternative label: GINH
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: WT
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: GINH AGG
has lithology component: GINH TUF
broader: SSDLO

Ginstane Ironstone
type: Concept
in scheme: NamedRockUnit
alternative label: GINI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: GINI FEST
broader: PGP

Gin Head (Older) Vent
type: Concept
in scheme: NamedRockUnit
alternative label: GINO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has lithology component: GINO AGG
has lithology component: GINO TUF
broader: NE

Girlsta Limestone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GIRL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GIRL MLMST
broader: Whiteness 'Division'

Gras Isaf Coal (South Wales)
type: Concept
in scheme: NamedRockUnit
alternative label: GISC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GISC COAL
broader: SWMCM

Gillfoot Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GISD
has current status: CURRENT
has theme: BEDRCK
notation: GISD
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CJ
has predominant age: CJ
has youngest age: CJ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40701
has lithology component: GISD CONG
has lithology component: GISD LMST
has lithology component: GISD SDST
has lithology component: GISD SLST
has source info: GISD_49410
has source info: GISD_53020
has obsolete equivalent: GISD mn 1708
has obsolete equivalent: GISD mn 1710
has obsolete equivalent: GISD mn 1709
broader: Fell Sandstone Formation
has lower boundary definition: Gradational contact with strata of the Southerness Limestone Formation.
has geographical distribution: Gillfoot Bay, Southerness, Kirkudbrightshire, south-western Scotland (Southern Uplands).
has lithology description: Interbedded medium- to coarse-grained sandstone and conglomerate.
has thickness description: 120 to 150m
has upper boundary definition: Gradational with the Powillimount Sandstone Formation, taken as the top of the uppermost conglomerate associated with reddened strata.

Georges Island Till
type: Concept
in scheme: NamedRockUnit
alternative label: GIT
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GIT DMTN
broader: NE

Gilwern Volcanic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GIVO
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: O2
has predominant age: O2
has youngest age: O2
broader: Builth Volcanic Group

Giffnock Jewel Coal (Glasgow)
type: Concept
in scheme: NamedRockUnit
alternative label: GJC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GJC COAL
has lateral equivalent: GJC st 220
broader: LSC

Gourock Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GKA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GKA
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CL
has predominant age: CL
has youngest age: CL
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40702
has lithology component: GKA LMST
has lithology component: GKA SDST
has lithology component: GKA SLMDST
has source info: GKA_49086
has source info: GKA_50587
has source info: GKA_52917
has obsolete equivalent: GKA GUF
broader: Clyde Sandstone Formation
has lower boundary definition: Although the boundary is not exposed it has been mapped in the vicinity of Gourock Golf Course [NS 2230 7630] on the basis of the presence of thick beds of white, cross-bedded pebbly sandstone belonging to the Gourock Sandstone Member overlying the more thinly bedded rocks of the Knocknairshill Member.
has geographical distribution: Greenock district south of the River Clyde, also west of the Largs Fault Zone, Strathclyde, Scotland.
has lithology description: White, cross-bedded sandstone with thin beds of red-brown silty mudstone; nodules and thin beds of pedogenic carbonate. This unit is distinguished from other units of the Clyde Sandstone Formation by the presence of thicker beds of sandstone, a lesser proportion of mudstone and less abundant calcareous nodules (Paterson and Hall, 1986; BGS, 1990). The sandstone is described as thick multi-storey bodies of white pebbly sandstone by Paterson et al. (1990).
has thickness description: c.300m
has upper boundary definition: Top not seen, but is presumed to be overlain by sandstone and mudstone strata of the Broadlee Glen Sandstone Member (Paterson and Hall, 1986) that include distinct plant debris and beds of grey mudstone (BGS, 1990).

Gortnaskea Coal (Dungannon)
type: Concept
in scheme: NamedRockUnit
alternative label: GKC
has current status: CURRENT
has theme: BEDRCK
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CB
has predominant age: CB
has youngest age: CB
has lithology component: GKC COAL
broader: Coal Measures Group [Obsolete Except In Northern Ireland: Use Pcm, Swcm, Cmsc]

Garnkirk Main Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: GKFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
broader: PGP
has geographical distribution: Glasgow area.

Garnkirk Lower Fireclay
type: Concept
in scheme: NamedRockUnit
alternative label: GKLF
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CY
has predominant age: CY
has youngest age: CY
broader: PGP

Gledstone Kennels Beds
type: Concept
in scheme: NamedRockUnit
alternative label: GKN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CF
has predominant age: CF
has youngest age: CF
broader: NE

Glenshesk Tuff Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GKTU
has current status: CURRENT
has theme: BEDRCK
notation: GKTU
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: CX
has predominant age: CX
has youngest age: CX
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40706
has lithology component: GKTU MDST
has lithology component: GKTU SDST
has lithology component: GKTU TUF
has source info: GKTU_50458
broader: Ballycastle Sandstone Group
has lower boundary definition: Lowest tuff layer resting on highest basalt lava flow of Carey River Basalt Formation.
has lithology description: Interbedded purplish brown, grey, tuffaceous mudstone; pale grey, tuffaceous sandstone; green, vitric and lithic, coarse tuffs.
has thickness description: 61 m.
has upper boundary definition: Lowest coal seam (H) of the Murlough Bay Coals overlying mudstone.

Glen Kyllachy Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GKYL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/O
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/O
broader: NWGRA

Great Limestone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GL
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40707
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40708
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40709
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40711
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40712
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40710
has lithology component: GL LMST
has lithology component: GL MDST
has source info: GL_48851
has source info: GL_49231
has source info: GL_49423
has source info: GL_49664
has source info: GL_49665
has source info: GL_49666
has source info: GL_50133
has source info: GL_50250
has source info: GL_50428
has source info: GL_50534
has source info: GL_50763
has source info: GL_51518
has source info: GL_52495
has source info: GL_52689
has obsolete equivalent: GL mn 1329
has obsolete equivalent: GL mn 1820
has obsolete equivalent: GL mn 827
has obsolete equivalent: GL mn 1568
has obsolete equivalent: GL ML
broader: Alston Formation
has lower boundary definition: Taken at the generally conformable, sharp base of the first bed of limestone that overlies measures of the Alston Formation; in most localities the limestone directly overlies the Tuft Sandstone, a brown, micaceous fine-grained sandstone that has a rooty upper part and which locally may be overlain by a thin carbonaceous smear or a coal.
has geographical distribution: Occurs throughout northern England at the top of the Alston Formation
has lithology description: Limestone (bioclastic packstone), medium to dark blue-grey, thickly bedded with thin shaly mudstone partings along uneven or wavy bedding planes. There is much crinoid debris throughout and there are many other beds rich in brachiopods and/or corals. The internal stratigraphy of the member is, in parts, remarkably consistent throughout the region and four informal divisions are recognised (Fairbairn, 1980), and referred to from the base upwards as the Bench, Main and Transitional posts and the Tumbler Beds. Beds rich in fossils are widespread. Most noteable and widespread are: the Chaetetes Band (Johnson, 1958) which occurs near the base; this comprises a sponge biostrome along with locally abundant brachiopods, corals and ostracods; within the Main Posts are the Brunton Band comprising the rare alga Calcifolium (Johnson, 1958; Cossey, et al, 2004), and the Frosterly Marble (Johnson, 1958). At the top, the Tumbler Beds, typically 2-5m thich, comprise thick beds of limestone interbedded with persistent mudstone units.
has thickness description: 14-18m north of the Lake District; c 12m in the Vale of Eden; 16-22m on the Alston Block; 22-24m with a maximum of 40m on the Askrigg Block and 8-15m in the Northumberland Trough; c 22m in the Langholm area and Archerbeck Borehole.
has upper boundary definition: Taken at the top of the uppermost limestone beds that is overlain by a sequence of dark grey siltstones and mudstones at the base of the Stainmore Formation.

Glass Coal (Midlothian)
type: Concept
in scheme: NamedRockUnit
alternative label: GLA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GLA COAL
broader: NE

Glacigenic Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GLACI
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: SUPD
narrower: MORD
narrower: ICD
narrower: TILL

Glenga Amphibolite Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLAM
has current status: CURRENT
has theme: BEDRCK
notation: GAM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40713
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40714
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40715
has lithology component: GLAM LMST
has lithology component: GLAM SCH
broader: Dart Formation
has lower boundary definition: Conformable on Dungiven Limestone Formation.
has geographical distribution: Glenga and Oughtnager Townlands, County Londonderry, Northern Ireland.
has lithology description: Pale to dark green amphibole schist with local thin lenticles of impure limestone.
has thickness description: Maximum 700m
has upper boundary definition: Chloritic greenbeds passing upwards into Dart Formation clastic lithologies.

Glassee Coal (Fife)
type: Concept
in scheme: NamedRockUnit
alternative label: GLAS
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CE
has predominant age: CE
has youngest age: CE
has lithology component: GLAS COAL
broader: LSC

Gunnscroft Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GLB
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: DL
has predominant age: DL
has youngest age: DL
has obsolete equivalent: GLB mn 425
broader: RBSM

Glen Banchor Succession
type: Concept
in scheme: NamedRockUnit
alternative label: GLBA
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40716
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40717
has lithology component: GLBA AMPHB
has lithology component: GLBA CALSIR
has lithology component: GLBA MGB
has lithology component: GLBA PSAMI
has lithology component: GLBA PSAMM
has lithology component: GLBA PSMGN
has lithology component: GLBA QZITE
has lithology component: GLBA SEMPEL
has lithology component: GLBA SPELGN
has lithology component: GLBA SPSCH
has source info: GLBA_50640
has source info: GLBA_51188
has obsolete equivalent: GLBA mn 852
broader: NP
narrower: Creag Liath Psammite
narrower: Creag An Loin Psammite Formation
narrower: An Stac Semipelite And Psammite Formation
has lower boundary definition: Not exposed.
has geographical distribution: Central Highlands of Scotland. Newtonmore - Kincraig areas and possibly with representatives in the Aviemore - Fortrose and Nairn districts.
has lithology description: Strongly gneissose heterolithic association - dominantly of psammite, striped psammite and semipelite quartzite. Locally migmatitic with minor pods and lenses of amphibolitic metabasic rock.
has thickness description: 1 - 1.5 km estimated.
has upper boundary definition: Unconformity interpreted with overlying Grampian and Appin Group metasediments.

Glaciolacustrine Beach Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GLBD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Glaciolacustrine Deposits

Glebe Farm Bed
type: Concept
in scheme: NamedRockUnit
alternative label: GLBF
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GF
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: JS
has predominant age: JS
has youngest age: JS
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40718
has lithology component: GLBF FEOOL
has lithology component: GLBF LMST
has source info: GLBF_49323
has source info: GLBF_50409
has source info: GLBF_52817
broader: Charmouth Mudstone Formation
has lower boundary definition: Sharp change up (probably an erosive non-sequence) from mudstone with argillaceous limestone nodules of undifferentiated Foston Member into limestone with pebbles as above; at 182.60m depth in type section Copper Hill Borehole (SK94SE/56). Base of Glebe Farm Bed marks base of Charmouth Mudstone Formation in this area.
has geographical distribution: East Midlands: north Leicestershire to Linclonshire. Not recognised in the Charmouth Mudstone Formation of north Lincolnshire, or south Leicestershire, where it passes south into mudstone-dominated Charmouth Mudstone formation.
has lithology description: Grey, brown weathering, bioclastic limestone bed up to 0.1m thick, with abundant bivalve fragments and limestone pebbles, overlain by brownish grey, weathering to reddish, ferru-ooidal limestone/calcareous ooidal ironstone bed up to 0.3m thick. Fauna includes gastropods, bivalves, forams, ammonites, belemnites and crinoids.
has thickness description: 0.2 to 0.5m; 0.20m in type section.
has upper boundary definition: Change up from limestone/ironstone as above into grey mudstone of Charmouth Mudstone Formation; at 182.40m depth in type section Copper Hill Borehole (SK94SE/56).

Glass Coal (Musselburgh, Midlothian)
type: Concept
in scheme: NamedRockUnit
alternative label: GLC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GLC COAL
broader: LCMS

Globe Coal (Somerset)
type: Concept
in scheme: NamedRockUnit
alternative label: GLCO
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CC
has predominant age: CC
has youngest age: CC
has lithology component: GLCO COAL
broader: Downend Member

Glen Lochsie Calcareous Schist Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLCS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: symb
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40719
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40720
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40721
has lithology component: GLCS CALPL
has lithology component: GLCS CALSIR
has lithology component: GLCS LMST
has lithology component: GLCS MLMST
has lithology component: GLCS PEL
has lithology component: GLCS PELGP
has lithology component: GLCS PSAMM
has lithology component: GLCS SCH
has source info: GLCS_51786
has source info: GLCS_52164
has obsolete equivalent: GLCS mn 1747
broader: Gleann Beag Schist Formation
has lower boundary definition: Stratigraphical boundary with the underlying Tulaichean Schist Formation. Boundary placed at a massive weathering, dark, garnet-biotite rock, where developed.
has geographical distribution: Northern part of Glen Shee district.
has lithology description: Dark metacarbonate rock and psammite with graphitic pelite and some garnet calcareous schist; crystalline metacarbonate rock locally developed at top of member.
has thickness description: 250m
has upper boundary definition: Top of prominent blue-grey coarsely crystalline metacarbonate rock below the overlying dominantly graphitic Glen Taitneach Schist Member.

Glauconitic Sandstone Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLCSA
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: JC
has predominant age: JC
has youngest age: JC
broader: Brora Argillaceous Formation

Glaciolacustrine Deposits [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
broader: Glaciolacustrine Deposits
narrower: Glaciolacustrine Deposits, Mostly Fines [See Descriptions For Limitations Of Use]
narrower: Glaciolacustrine Deposits, Mostly Gravels [See Descriptions For Limitations Of Use]
has supplementary information: This was originally used as part of the Sellafield Quaternary Domains Map. To avoid potential confusion it should be used only for similar purposes in future. See also GLDF, GLDG and GLDS. The full description on the original map was "GLACIOLACUSTRINE DEPOSITS (mainly beyond Scottish Readvance)".

Glaciolacustrine Deltaic Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GLDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: GLDD CLAY
has lithology component: GLDD GRAV
has lithology component: GLDD SANDU
has lithology component: GLDD SILT
broader: NE
narrower: Glaciolacustrine Deltaic Deposits, Devensian
has lithology description: Sand, gravel and clay; formed during the melting of glacier ice. [Generic description: 1:50 k map margins].

Glaciolacustrine Deltaic Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GLDDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Glaciolacustrine Deltaic Deposits

Glaciolacustrine Deposits, Mostly Fines [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLDF
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/
broader: Glaciolacustrine Deposits [See Descriptions For Limitations Of Use]
has supplementary information: This was originally used as part of the Sellafield Quaternary Domains Map. To avoid potential confusion it should be used only for similar purposes in future. See also GLD, GLDG and GLDS. The full description on the original map was "GLACIOLACUSTRINE DEPOSITS (mainly beyond Scottish Readvance), Mostly fines.

Glaciolacustrine Deposits, Mostly Gravels [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLDG
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/-
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GLDG GRAV
broader: Glaciolacustrine Deposits [See Descriptions For Limitations Of Use]
has supplementary information: This was originally used as part of the Sellafield Quaternary Domains Map. To avoid potential confusion it should be used only for similar purposes in future. See also GLDF, GLDS and GLD. The full description on the original map was "GLACIOLACUSTRINE DEPOSITS (mainly beyond Scottish Readvance), Mostly gravels"..

Glen Dhoo Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLDH
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: O1
has predominant age: O1
has youngest age: O1
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40722
has lithology component: GLDH MDST
has lithology component: GLDH SDST
has lithology component: GLDH SLST
has source info: GLDH_50459
has source info: GLDH_50554
has source info: GLDH_51128
has source info: GLDH_51179
has source info: GLDH_52552
has obsolete equivalent: GLDH mn 1782
has obsolete equivalent: GLDH mn 2478
has obsolete equivalent: GLDH mn 2477
broader: MANX
has lower boundary definition: Faulted.
has geographical distribution: Isle of Man.
has lithology description: A pale grey mudstone, with a variable proportion of siltstone laminae and sandstone dispersed in thin; sandstone locally predominant in thin to thick-bedded packets; siltstone, massive, dominant locally; minor occurences of andesitic tuff and volcanic breccia
has thickness description: About 300 m thick.
has upper boundary definition: Faulted contact only with the Ladyport Formation, which is distinguished by a change from a siltstone/sandstone-dominated facies to a mudstone-dominated facies in the Ladyport.

Glaciolacustrine Deposits, Mostly Sands [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLDS
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GLDS SANDU
broader: NE
has supplementary information: This was originally used as part of the Sellafield Quaternary Domains Map. To avoid potential confusion it should be used only for similar purposes in future. See also GLDF, GLDG and GLD. The full description on the original map was "GLACIOLACUSTRINE DEPOSITS (mainly beyond Scottish Readvance), Mostly sands".

Glen Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLE
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: PNDUPG
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: CR
has youngest age: CR
has lithology component: GLE BREC
has lithology component: GLE SDST
broader: MEF
has lower boundary definition: Abrupt changes at top and bottom of member to interbedded shale and micrites of Meenymore Formation.
has geographical distribution: Not defined.
has lithology description: Grey-buff coloured gritty-coarse grained compact sandstone interbedded with thin horizons of mudflake breccia containing fragments of shale and laminate micrite from underlying Meenymor Formation.
has thickness description: c 20 metres (estimated).
has upper boundary definition: Abrupt changes at top and bottom of member to interbedded shale and micrites of Meenymore Formation.

Glenfinnan Group And Loch Eil Group (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GLEIL
has current status: CURRENT
has theme: BEDRCK
has unit class: CMP
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GLEIL MLMST
has lithology component: GLEIL PEL
has lithology component: GLEIL PSAMI
has lithology component: GLEIL PSAMM
has lithology component: GLEIL QZITE
has lithology component: GLEIL SCHQZ
has lithology component: GLEIL SEMPEL
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M
narrower: PORK
narrower: QUIO

Glenboig Limestone
type: Concept
in scheme: NamedRockUnit
alternative label: GLEL
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: GLEL LMST
broader: ULGS
has geographical distribution: Central Coalfield area, Midland Valley of Scotland.

Glenfinnan Group
type: Concept
in scheme: NamedRockUnit
alternative label: GLEN
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/G
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has lithology component: GLEN PEL
has lithology component: GLEN PELGN
has lithology component: GLEN PSAMI
has lithology component: GLEN PSAMM
has lithology component: GLEN PSMGN
has lithology component: GLEN QZITE
has lithology component: GLEN SEMPEL
has lithology component: GLEN SPMM
has obsolete equivalent: GLEN mn 1773
broader: http://data.bgs.ac.uk/id/Lexicon/NamedRockUnit/M
narrower: Achnaconeran Striped Formation
narrower: Achnacarry Striped Formation
narrower: SALP
narrower: SCPE
narrower: Ben Wyvis Pelite Formation
narrower: Druim Na Saille Pelite Formation
narrower: Garve Psammite Formation
narrower: LAMO
narrower: SGMC
narrower: MBLA
narrower: LOCE
narrower: Beinn Gaire Psammite Formation
narrower: Ardalanish Striped Formation
narrower: REP
narrower: RESI
narrower: Beinn An Tuim Striped Formation

Glencolumbkille Pelite Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLEP
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
broader: Blair Atholl Subgroup
has geographical distribution: Recognised in the Republic of Ireland.

Gwent Levels Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLEV
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QH
has predominant age: QH
has youngest age: QH
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40723
has lithology component: GLEV C
has lithology component: GLEV P
has lithology component: GLEV S
has lithology component: GLEV V
has lithology component: GLEV Z
has source info: GLEV_48768
has source info: GLEV_50624
has source info: GLEV_50800
has source info: GLEV_52620
has obsolete equivalent: GLEV mn 1480
broader: British Coastal Deposits Group
has lower boundary definition: Rests unconformably of Triassic bedrock.
has geographical distribution: The Gwent Levels. From Caldicot, Monmouthshire, to Cardiff.
has lithology description: Formation encompasses marine, estuarine and terrestrial deposits that were formed in the Gwent Levels area during the Holocene transgression. The deposits are dark blue-grey silty clays and silts with subordinate sands and beds of peat, submerged forests and gravel. The deposits rest on a rockhead platform at -5 to -7.5m OD, intricately dissected by river valleys, and their upper surface is approximately level at c 4.5 to 7m OD. The river valleys are infilled with gravels and sands that become shelly upwards. Typically two beds of peat are included, up to 0.6m thick. The lower of these forms the lowest unit in the formation, except where it rests upon the valley-fill sands and gravels, and was formed c 8500-8000 years BP when a birch forest was inundated by the rising sea. The other formed c.5000-4500 years BP during a slowing down of the rising sea level, and is now found resting horizontally at OD.
has thickness description: 10 to 15m, increasing to 35m in buried channels.
has upper boundary definition: Surface.

Glenboig Lower Fireclay (Central Coalfield)
type: Concept
in scheme: NamedRockUnit
alternative label: GLFC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CN
has predominant age: CN
has youngest age: CN
has lithology component: GLFC SEATM
broader: PGP
has additional age information: ? Arnsbergian.

Glenfuir Coal [Central Coalfield]
type: Concept
in scheme: NamedRockUnit
alternative label: GLFU
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CA
has predominant age: CA
has youngest age: CA
has lithology component: GLFU COAL
has lateral equivalent: GLFU st 48
broader: LCMS

Lutetian And Bartonian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GLGB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GB
broader: NE

Lutetian To Priabonian Rocks (Undifferentiated)
type: Concept
in scheme: NamedRockUnit
alternative label: GLGI
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: OFFSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GL
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: GI
broader: NE

Glamorgan Glacigenic Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLGL
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: WALES

Glacial Gravel
type: Concept
in scheme: NamedRockUnit
alternative label: GLGR
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GLGR GRAV
has lithology component: GLGR SANDU
broader: NE
has lithology description: Sand and gravel, locally with interbeds of silt and clay; of glacial origin. [Generic description].

Glenbuchat Graphitic Schist Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLGS
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: SYMB
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40724
has lithology component: GLGS LMST
has lithology component: GLGS PELGP
has lithology component: GLGS PSAMM
has lithology component: GLGS SEMPEL
has source info: GLGS_49233
broader: Easdale Subgroup
narrower: Delnadamph Volcanic Member
has lower boundary definition: Lower limit of graphitic pelites above striped phyllitic semipelites and psammites of the Culchavie Striped Formation.
has geographical distribution: Elongate, N-S trending outcrop, up to 750m wide, extending from area of Scors Burn [NJ 322 229] to Glen More [NJ 328 044]. Also in Lecht area, Gordon District. 1: 50 000 Sheet 75E.
has lithology description: Graphitic pelites and semipelites, slaty to schistose with minor psammite and rare banded limestone.
has thickness description: To 500m.
has upper boundary definition: Upper limit of graphitic pelites at the base of schistose semipelites of the Badenyon Schist and Limestone Formation.

Glen Lethnot Grit Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLGT
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: litho
has revision number: 2
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40725
has lithology component: GLGT PEL
has lithology component: GLGT PSAMG
has lithology component: GLGT PSAMM
has lithology component: GLGT QZITE
has lithology component: GLGT SCH
has lithology component: GLGT SCHM
has lithology component: GLGT SEMPEL
has source info: GLGT_49842
has source info: GLGT_49851
has obsolete equivalent: GLGT mn 1757
broader: NE
has lower boundary definition: Gradational transition from Glen Effock Schist Formation marked by incoming of silvery muscovite-rich pelite, increase in proportion of gritty psammite and decrease in proportion of green feldspathic semipelite.
has geographical distribution: Occurs in the southeast corner of Sheet 65E and the southern border of Sheet 66W from White Hill (NO 402 731) to Bannock Hill (NO 610 760).
has lithology description: Mixed psammite, semipelite and pelite. Psammites typically gritty. Pelites include types rich in staurolite and muscovite, and some are also kyanite-bearing. Schists rich in iron-ore minerals form mappable units in places. Beds of quartzite with specks of green mica occur rarely near the base of the Formation.
has thickness description: At least 3000m indicated in Glen Esk; tectonic thickening probably less than in Glen Effock Schist Formation.
has upper boundary definition: Not seen: faulted against Highland Border Complex.

Glynbourne Hardgrounds
type: Concept
in scheme: NamedRockUnit
alternative label: GLHG
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: NPCH

Glaciolacustrine Deposits
type: Concept
in scheme: NamedRockUnit
alternative label: GLLD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
has lithology component: GLLD C
has lithology component: GLLD CZ
has lithology component: GLLD P
has lithology component: GLLD S
has lithology component: GLLD Z
has obsolete equivalent: GLLD mn 1720
is obsolete equivalent of: GLLD TFICL
is obsolete equivalent of: GLLD GECL
broader: NE
narrower: Glaciolacustrine Subaqueous Fan Deposits
narrower: Glaciolacustrine Beach Deposits
narrower: Glaciolacustrine Deposits [See Descriptions For Limitations Of Use]
narrower: Glaciolacustrine Deposits, Devensian
has lithology description: Silt and clay, laminated, commonly rich in organic matter, locally with interbedded peat; of glaciolacustrine origin. [Generic description: academic papers and BGS Memoirs].

Glaciolacustrine Deposits, 1
type: Concept
in scheme: NamedRockUnit
alternative label: GLLD1
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q1
has predominant age: Q1
has youngest age: Q1
has lithology component: GLLD1 CLAY
has lithology component: GLLD1 SANDU
has lithology component: GLLD1 SILT
broader: NE

Glaciolacustrine Deposits (Anglian)
type: Concept
in scheme: NamedRockUnit
alternative label: GLLDA
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QA
has predominant age: QA
has youngest age: QA
broader: NE

Glaciolacustrine Deposits, Devensian
type: Concept
in scheme: NamedRockUnit
alternative label: GLLDD
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
broader: Glaciolacustrine Deposits

Glaciolacustrine Deposits (Irish Sea Ice)
type: Concept
in scheme: NamedRockUnit
alternative label: GLLDI
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/U
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: NE

Glaciolacustrine Deposits (Age Unknown)
type: Concept
in scheme: NamedRockUnit
alternative label: GLLDU
has current status: CURRENT
has theme: http://data.bgs.ac.uk/id/Lexicon/Theme/
has revision number: 0
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/!
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/!
broader: NE

Glaciolacustrine Deposits, Mid Pleistocene
type: Concept
in scheme: NamedRockUnit
alternative label: GLLMP
has current status: CURRENT
has theme: SPRFCL
has unit class: LMG
has revision number: 0
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: QC
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: QI
broader: NE
has additional age information: Cromerian to Oxygen Isotope Stage 6.

Glenelly Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLLY
has current status: CURRENT
has theme: BEDRCK
notation: GY
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: AZ
has predominant age: AZ
has youngest age: AZ
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40726
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40727
has lithology component: GLLY PEL
has lithology component: GLLY PSAMM
has lithology component: GLLY PSAP
has lithology component: GLLY PSCHAC
has lithology component: GLLY SCH
has lithology component: GLLY SEMPEL
has source info: GLLY_48834
has source info: GLLY_49400
has obsolete equivalent: GLLY mn 1771
has obsolete equivalent: GLLY mn 4231
broader: SOHI
narrower: Clogherny Member
narrower: OUB
narrower: Garvagh Bridge Member
narrower: Clogherny Member [Duplicate Code: Use Cghy]
narrower: Golan Burn Member
has lower boundary definition: Conformable with Dart Formation.
has geographical distribution: Sperrin Mountains, counties Tyrone and south Londonderry, Northern Ireland.
has lithology description: Mixed series of quartz feldspar psammites and semi pelitic biotite schists with tourmaline.
has thickness description: at least 2.7km
has upper boundary definition: Conformable with Glengawna Formation.

Glenkeel Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CR
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/
has youngest age: CX
has lithology component: GLM LMST
has lithology component: GLM MDST
has lithology component: GLM SLST
broader: Bellavally Formation

Glynde Marls (One)
type: Concept
in scheme: NamedRockUnit
alternative label: GLMA1
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Glynde Marls (Two)
type: Concept
in scheme: NamedRockUnit
alternative label: GLMA2
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KT
has predominant age: KT
has youngest age: KT
broader: LECH

Glenboig Marine Band
type: Concept
in scheme: NamedRockUnit
alternative label: GLMB
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/B
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: CG
has predominant age: CG
has youngest age: CG
has lithology component: GLMB SHMDST
broader: ULGS
has additional age information: ? Arnsbergian.

Glion Cam Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLMC
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: OR
has predominant age: OR
has youngest age: OR
broader: MANX

Glascoed Mudstone Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLMD
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
has revision number: 1
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: LOCAL
has shape type: NotEntered
has oldest age: SW
has predominant age: SW
has youngest age: SW
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40728
has lithology component: GLMD CLAY
has lithology component: GLMD LMST
has lithology component: GLMD MDST
has lithology component: GLMD SLST
has source info: GLMD_50136
has source info: GLMD_51233
has obsolete equivalent: GLMD mn 4567
has lateral equivalent: GLMD st 639
broader: NP
has lower boundary definition: Not seen.
has geographical distribution: The central part of the (Silurian) Usk Inlier, South Wales.
has lithology description: Calcareous silty mudstones and siltstones, with limestone nodules, localised thin bentonitic clays, and very fossiliferous containing a diverse shelly fauna, mainly of brachiopods.
has thickness description: At least 220 m thick.
has upper boundary definition: At the base of sandstone-dominated beds of the Ton Siltstone Formation.

Glauconitic Marl Member
type: Concept
in scheme: NamedRockUnit
alternative label: GLML
has current status: CURRENT
has theme: BEDRCK
has unit class: LS
notation: GM
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/M
has definition status: INDEX
has formality: INFORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: KE
has predominant age: KE
has youngest age: KE
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40729
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40730
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40731
has lithology component: GLML CAMDST
has lithology component: GLML GLSST
has lithology component: GLML LMST
has lithology component: GLML SANDU
has lithology component: GLML SDST
has lithology component: GLML SLST
has source info: GLML_49406
has source info: GLML_50353
has source info: GLML_51916
has source info: GLML_52144
has source info: GLML_52814
has obsolete equivalent: GLML mn 917
has obsolete equivalent: GLML mn 2539
has obsolete equivalent: GLML mn 303
has obsolete equivalent: GLML GLML
is obsolete equivalent of: GLML GLML
broader: WMCH
has additional age information: Upper Cretaceous, Cenomanian. Mantelliceras mantelli Zone, Neostlingoceras carcitanense Subzone. (Note: over synsedimentary highs such as the Mid Dorset Swell the age range may well included zones up to Acanthoceras rhotomagense).
has lower boundary definition: Base of glauconite-rich sand or clay resting disconformably, at a strongly burrowed surface, on pale grey siltstones of the Upper Greensand (or grey mudstones of the Gault), which contain only a trace of glauconite at most. [Note: bioturbation may carry glauconitic sediment down into underlying formation].
has geographical distribution: Known throughout much of the Southern Province in Kent, Surrey, Sussex, Hampshire and Berkshire.
has lithology description: Calcareous glauconitic sand and glauconitic sandy silty chalk with phosphatic nodules.
has thickness description: 2-4m throughout much of Southern Province, may be only a few tenths of a metre elsewhere over synsedimentary structural highs. Up to 5m in Kent and at Eastbourne, East Sussex.
has upper boundary definition: Upwards cessation of sand and/or abundant glauconitic grains (and phosphatic pebbles)(can occur as a rapid transition over 10cm or less) into grey, sparsely glauconitic chalky marl or marly chalk, comprising the rest of the West Melbury Marly Chalk Formation and part of the Zig Zag Chalk Formation (broadly equivalent to the traditional scheme 'Chalk Marl').

Glen More (Centre 1) Suite
type: Concept
in scheme: NamedRockUnit
alternative label: GLMO
has current status: CURRENT
has theme: BEDRCK
has unit class: LDIN
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/S
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/G
has lithology component: GLMO AGG
has lithology component: GLMO AND
has lithology component: GLMO BA
has lithology component: GLMO DOLR
has lithology component: GLMO FELS
has lithology component: GLMO GB
has lithology component: GLMO GNGP
has lithology component: GLMO MCDI
has lithology component: GLMO MCGB
has lithology component: GLMO MCGD
has lithology component: GLMO MCOLGB
has lithology component: GLMO MFIR
has lithology component: GLMO OLGB
has lithology component: GLMO RY
has lithology component: GLMO TROCT
has lithology component: GLMO TUFIST
broader: MUCC

Glen Balleira Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLNBA
has current status: CURRENT
has theme: SPRFCL
has unit class: LS
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: FULL
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: GENRAL
has shape type: NotEntered
has oldest age: QD
has predominant age: QD
has youngest age: QD
has stratotype: http://data.bgs.ac.uk/id/Lexicon/Stratotype/40732
has lithology component: GLNBA CSIMD
has lithology component: GLNBA ORMUD
has lithology component: GLNBA PEAT
has source info: GLNBA_50273
has source info: GLNBA_50596
has source info: GLNBA_51128
broader: IMCA
has additional age information: Late Devensian (Lateglacial 18.5 to 12.5 ka PB).
has lower boundary definition: Unconformably overlies glacigenic deposits (diamictons, laminated muds, sands and gravels) of the Jurby and Orrisdale formations.
has geographical distribution: Northern part of the Isle of Man. (50k sheets 36 and possibly 46).
has lithology description: Peat, organic mud and calcareous marl that infills kettlehole basins.
has thickness description: 2m of calcareous marl, capped by peaty clay, is recorded in a kettlehole infill at Glen Wyllin.
has upper boundary definition: Usually the ground surface, but may be overlain by Holocene sediments (such as peat, with Holocene plant and insect remains, or brown sand).

Glacan Mor Basic Magmatic Breccia Intrusion
type: Concept
in scheme: NamedRockUnit
alternative label: GLNM
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/I
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: GP
has predominant age: GP
has youngest age: GP
has lithology component: GLNM GB
has lithology component: GLNM MCGB
broader: STKI

Glendowran Formation
type: Concept
in scheme: NamedRockUnit
alternative label: GLNN
has current status: CURRENT
has theme: BEDRCK
has revision number: 0
has rock unit rank: http://data.bgs.ac.uk/id/Lexicon/RockUnitRank/F
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has predominant age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has youngest age: http://data.bgs.ac.uk/id/Geochronology/Division/P
has lithology component: GLNN SDST
broader: NE

Glacially Over-Ridden Terrain (By Readvance Ice) [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLO
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: Glacial Deposits
narrower: Glacially Over-Ridden Terrain (By Readvance Ice), Mostly Till [See Descriptions For Limitations Of Use]
narrower: Glacially Over-Ridden Terrain (By Readvance Ice), Mostly Fines [See Descriptions For Limitations Of Use]
narrower: Glacially Over-Ridden Terrain (By Readvance Ice), Mostly Gravels [See Descriptions For Limitations Of Use]
narrower: Glacially Over-Ridden Terrain (By Readvance Ice), Mostly Sand [See Descriptions For Limitations Of Use]
has supplementary information: The code was originated for use in describing Quaternary Domains in the Sellafield (Cumbria) area. To avoid potential confusion it should be used only for similar purposes in future. See also GLOD, GLOF, GLOG and GLOS. Note that on the related Quaternary Domains map, this category was described as: "GLACIALLY OVER-RIDDEN TERRAIN (by Readvance Ice) (recognised by scattered hill-hole pairs, extensional normal faulting dying out at depth, surficial Scottish Readvance diamicton and associated subglacial shearing)".

Glacially Over-Ridden Terrain (By Readvance Ice), Mostly Till [See Descriptions For Limitations Of Use]
type: Concept
in scheme: NamedRockUnit
alternative label: GLOD
has current status: CURRENT
has theme: SPRFCL
has revision number: 0
has rock unit rank: LU
has definition status: INDEX
has formality: FORMAL
is onshore offshore: ONSHORE
has spatial scope of definition: NotApplicable
has shape type: NotEntered
has oldest age: Q2
has predominant age: Q2
has youngest age: Q2
broader: Glacially Over-Ridden Terrain (By Readvance Ice) [See Descriptions For Limitations Of Use]
has supplementary information: The code was originated for use in describing Quaternary Domains in the Sellafield (Cumbria) area. To avoid potential confusion it should be used only for similar purposes in future. See also GLO, GLOF, GLOG and GLOS. Note that on the related Quaternary Domains map, this category was described as: "GLACIALLY OVER-RIDDEN TERRAIN (by Readvance Ice) (recognised by scattered hill-hole pairs, extensional normal faulting dying out at depth, surficial Scottish Readvance diamicton and associated subglacial shearing), Mostly till".