The dataset is made freely available for access, e.g. via the Internet. Either no third party data / information is contained in the dataset or BGS has secured written permission from the owner(s) of any third party data / information contained in the dataset to make the dataset freely accessible.
This schema defines named divisions of geological time.
BGS Geological Time Divisions
Geological time is divided into useful segments that are then further sub-divided. A well known example is the Jurassic, which is a Period, part of the (much longer) Mezosoic Era. The Jurassic Period is sub-divided into the Early, Mid and Late Jurassic Epochs. Some Eras are divided into sub-eras, similarly, Periods, Epochs and Ages can have sub-divisions.
Hadean
HADEAN
Informal name.
Neoproterozoic III Period [Obsolete age term]
NEOPROTEROZOIC III [OBSOLETE AGE TERM: USE EDIACARAN]
Not on 2009 BGS Geological Time Chart; use AD Ediacaran Period.
Palaeoarchaean Era
PALAEOARCHAEAN
Ectasian Period
ECTASIAN
Cryogenian Period
CRYOGENIAN
Ediacaran Period
EDIACARAN
Eoarchaean Era
EOARCHAEAN
Rhyacian Period
RHYACIAN
Stenian Period
STENIAN
Palaeoproterozoic Era
PALAEOPROTEROZOIC
Mesoarchaean Era
MESOARCHAEAN
Neoarchaean Era
NEOARCHAEAN
Orosirian Period
OROSIRIAN
Proterozoic Eon
PROTEROZOIC
Stratherian Period
STRATHERIAN
Archaean Eon
ARCHAEAN
Siderian Period
SIDERIAN
Tonian Period
TONIAN
Mesoproterozoic Era
MESOPROTEROZOIC
Calymmian Period
CALYMMIAN
Neoproterozoic Era
NEOPROTEROZOIC
Bavelian Age
BAVELIAN
See RR/04/04.
Cromerian Complex Age
CROMERIAN COMPLEX
Contemporaneous with Cromerian; MIS 13-21; RR/04/04.
Weichselian Age
WEICHSELIAN
Contemporaneous with Devensian; see RR/04/04.
Eburonian Age
EBURONIAN
Holsteinian Age
HOLSTEINIAN
Contemporaneous with Hoxnian; MIS 11; see RR/04/04.
Eemian Age
EEMIAN
Contemporaneous with Ipswichian; MIS 5e; see RR/04/04.
Elsterian Age
ELSTERIAN
Contemporaneous with Anglian; MIS 12; see RR/04/04.
Menapian Age
MENAPIAN
Praetiglian Age
PRAETIGLIAN
MIS 96-100; see RR/04/04.
Reuverian Age
REUVERIAN
Reuverian C Sub-age
REUVERIAN C
MIS 103; see RR/04/04.
Saalian Age
SAALIAN
Contemporaneous with Wolstonian; MIS 6-10; see RR/04/04.
Tiglian Age
TIGLIAN
Tiglian A Sub-age
TIGLIAN A
Contemporaneous with Ludhamian; see RR/04/04.
Tiglian B Sub-age
TIGLIAN B
Contemporaneous with Thurnian; see RR/04/04.
Tiglian C Sub-age
TIGLIAN C
Waalian Age
WAALIAN
Carboniferous Period
CARBONIFEROUS
Langsettian Sub-age
LANGSETTIAN
British regional sub-age; also known as Westphalian A.
Westphalian A Sub-age
WESTPHALIAN A
Not on 2009 BGS Geological Time Chart; British regional sub-age; use CA Langsettian.
Duckmantian Sub-age
DUCKMANTIAN
British regional sub-age; also known as Westphalian B.
Westphalian B Sub-age
WESTPHALIAN B
Not on 2009 BGS Geological Time Chart; British regional sub-age; use CB Duckmantian.
Bashkirian Age
BASHKIRIAN
Bolsovian Sub-age
BOLSOVIAN
British regional sub-age; also known as Westphalian C.
Westphalian C Sub-age
WESTPHALIAN C
Not on 2009 BGS Geological Time Chart; British regional sub-age; use CC Bolsovian.
Westphalian D Sub-age
WESTPHALIAN D
British regional sub-age.
Pendleian Sub-age
PENDLEIAN
Courceyan Age
COURCEYAN
British regional age.
Arnsbergian Sub-age
ARNSBERGIAN
Gzhelian Age
GZHELIAN
Chokierian Sub-age
CHOKIERIAN
Chadian Age
CHADIAN
Arundian Age
ARUNDIAN
Kinderscoutian Sub-age
KINDERSCOUTIAN
Kasimovian Age
KASIMOVIAN
Dinantian Sub-period [Obsolete age term]
DINANTIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS MISSISSIPPIAN]
Not on 2009 BGS Geological Time Chart; no direct replacement term.
Mississippian Sub-period
MISSISSIPPIAN
Early Mississippian Epoch
EARLY MISSISSIPPIAN
Late Mississippian Epoch
LATE MISSISSIPPIAN
Mid Mississippian Epoch
MID MISSISSIPPIAN
Moscovian Age
MOSCOVIAN
Namurian Age
NAMURIAN
Alportian Sub-age
ALPORTIAN
Pennsylvanian Sub-period
PENNSYLVANIAN
Early Pennsylvanian Epoch
EARLY PENNSYLVANIAN
Late Pennsylvanian Epoch
LATE PENNSYLVANIAN
Mid Pennsylvanian Epoch
MID PENNSYLVANIAN
Holkerian Age
HOLKERIAN
Asbian Age
ASBIAN
Stephanian Age
STEPHANIAN
Serpukhovian Age
SERPUKHOVIAN
Tournaisian Age
TOURNAISIAN
Silesian Sub-period [Obsolete age term]
SILESIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS PENNSYLVANIAN]
Visean Age
VISEAN
Westphalian Age
WESTPHALIAN
Brigantian Age
BRIGANTIAN
Yeadonian Sub-age
YEADONIAN
Marsdenian Sub-age
MARSDENIAN
Devonian Period
DEVONIAN
Famennian Age
FAMENNIAN
Emsian Age
EMSIAN
Eifelian Age
EIFELIAN
Early Devonian Epoch
EARLY DEVONIAN
Mid Devonian Epoch
MID DEVONIAN
Lochkovian Age
LOCHKOVIAN
Pragian Age
PRAGIAN
Frasnian Age
FRASNIAN
Late Devonian Epoch
LATE DEVONIAN
Givetian Age
GIVETIAN
Cambrian Period
CAMBRIAN
Cambrian Stage 2
CAMBRIAN STAGE 2
Cambrian Stage 3
CAMBRIAN STAGE 3
Cambrian Stage 4
CAMBRIAN STAGE 4
Cambrian Stage 5
CAMBRIAN STAGE 5
Paibian Age
PAIBIAN
Cambrian Stage 9
CAMBRIAN STAGE 9
Cambrian Stage 10
CAMBRIAN STAGE 10
Cambrian Series 2
CAMBRIAN SERIES 2
Cambrian Series 3
CAMBRIAN SERIES 3
Comley Epoch
COMLEY
British regional epoch.
St David's Epoch
ST DAVID'S
Drumian Age
DRUMIAN
Furongian Epoch
FURONGIAN
Fortunian Age
FORTUNIAN
Guzhangian Age
GUZHANGIAN
Merioneth Epoch
MERIONETH
Terreneuvian Epoch
TERRENEUVIAN
Tremadoc Epoch [Obsolete age code]
TREMADOC [OBSOLETE AGE CODE]
Code not suitable for use within Ordovician; use OTR Tremadocian or O1 Tremadoc.
Phanerozoic Eon
PHANEROZOIC
Palaeogene Period
PALAEOGENE
Bartonian Age
BARTONIAN
Chattian Age
CHATTIAN
Danian Age
DANIAN
Eocene Epoch
EOCENE
Early Eocene Sub-epoch
EARLY EOCENE
Late Eocene Sub-epoch
LATE EOCENE
Mid Eocene Sub-epoch
MID EOCENE
Priabonian Age
PRIABONIAN
Lutetian Age
LUTETIAN
Oligocene Epoch
OLIGOCENE
Early Oligocene Sub-epoch
EARLY OLIGOCENE
Late Oligocene Sub-epoch
LATE OLIGOCENE
Paleocene Epoch
PALEOCENE
Early Paleocene Sub-epoch
EARLY PALEOCENE
Late Paleocene Sub-epoch
LATE PALEOCENE
Mid Paleocene Sub-epoch
MID PALEOCENE
Rupelian Age
RUPELIAN
Selandian Age
SELANDIAN
Thanetian Age
THANETIAN
Ypresian Age
YPRESIAN
Cenozoic Era
CENOZOIC
Tertiary Sub-era
TERTIARY
Jurassic Period
JURASSIC
Aalenian Age
AALENIAN
Bajocian Age
BAJOCIAN
Callovian Age
CALLOVIAN
Kimmeridgian Age
KIMMERIDGIAN
Pliensbachian Age
PLIENSBACHIAN
Hettangian Age
HETTANGIAN
Tithonian Age
TITHONIAN
Early Jurassic Epoch
EARLY JURASSIC
Mid Jurassic Epoch
MID JURASSIC
Bathonian Age
BATHONIAN
Oxfordian Age
OXFORDIAN
Portlandian Age [Obsolete age term]
PORTLANDIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS TITHONIAN]
Sinemurian Age
SINEMURIAN
Toarcian Age
TOARCIAN
Late Jurassic Epoch
LATE JURASSIC
Volgian Age [Obsolete age term]
VOLGIAN [OBSOLETE AGE TERM: USE TITHONIAN]
Not on 2009 BGS Geological Time Chart; use JI Tithonian.
Cretaceous Period
CRETACEOUS
Albian Age
ALBIAN
Barremian Age
BARREMIAN
Campanian Age
CAMPANIAN
Cenomanian Age
CENOMANIAN
Hauterivian Age
HAUTERIVIAN
Early Cretaceous Epoch
EARLY CRETACEOUS
Maastrichtian Age
MAASTRICHTIAN
Coniacian Age
CONIACIAN
Aptian Age
APTIAN
Berriasian Age
BERRIASIAN
Santonian Age
SANTONIAN
Turonian Age
TURONIAN
Late Cretaceous Epoch
LATE CRETACEOUS
Valanginian Age
VALANGINIAN
Ryazanian Age [Obsolete age term]
RYAZANIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS BERRIASIAN]
Mesozoic Era
MESOZOIC
Neogene Period
NEOGENE
Neogene Period [Obsolete concept for period]
NEOGENE [OBSOLETE CONCEPT FOR THIS PERIOD]
Used when Plio-Pleistocene boundary was placed at 1.806 MA, no longer the accepted BGS definition; use N Neogene.
Aquitanian Age
AQUITANIAN
Burdigalian Age
BURDIGALIAN
Piacenzian Age
PIACENZIAN
Also known as Waltonian Age.
Messinian Age
MESSINIAN
Piacenzian Age [Obsolete concept for age]
PIACENZIAN [OBSOLETE CONCEPT FOR THIS AGE]
Used when Plio-Pleistocene boundary was placed at 1.806 MA, no longer the accepted BGS definition; use NC Piacenzian.
Langhian Age
LANGHIAN
Miocene Epoch
MIOCENE
Early Miocene Sub-epoch
EARLY MIOCENE
Late Miocene Sub-epoch
LATE MIOCENE
Mid Miocene Sub-epoch
MID MIOCENE
Pliocene Epoch [Obsolete concept for epoch]
PLIOCENE [OBSOLETE CONCEPT FOR THIS EPOCH]
Used when Plio-Pleistocene boundary was placed at 1.806 MA, no longer the accepted BGS definition; use NP Pliocene.
Early Pliocene Sub-epoch
EARLY PLIOCENE
Late Pliocene Sub-epoch
LATE PLIOCENE
Pliocene Epoch
PLIOCENE
Serravallian Age
SERRAVALLIAN
Tortonian Age
TORTONIAN
Waltonian Age
WALTONIAN
Not on 2009 BGS Geological Time Chart; use NC Piacenzian.
Zanclean Age
ZANCLEAN
Ordovician Period
ORDOVICIAN
Tremadoc Epoch
TREMADOC
Abereiddian Age
ABEREIDDIAN
Not on 2009 BGS Geological Time Chart but retained for use.
Llandeilian Age
LLANDEILIAN
Caradoc Epoch
CARADOC
Ashgill Epoch
ASHGILL
Moridunian Age
MORIDUNIAN
Caradoc Epoch [Obsolete concept for epoch]
CARADOC [OBSOLETE CONCEPT FOR THIS EPOCH]
Used when base was placed at base of Costonian, no longer the accepted BGS definition; use O4 Caradoc.
Llandeilo Epoch [Obsolete age term]
LLANDEILO [OBSOLETE AGE TERM: USE LLANDEILIAN]
Not on 2009 BGS Geological Time Chart; use O3 Llandeilian.
Dapingian Age
DAPINGIAN
Darriwilian Age
DARRIWILIAN
Llanvirn Epoch
LLANVIRN
Early Ordovician Epoch
EARLY ORDOVICIAN
Fennian Age
FENNIAN
Floian Age
FLOIAN
Harnagian Sub-age
HARNAGIAN
Hirnantian Age
HIRNANTIAN
Whitlandian Age
WHITLANDIAN
Aurelucian Age
AURELUCIAN
Burrellian Age
BURRELLIAN
Katian Age
KATIAN
Longvillian Sub-age
LONGVILLIAN
Late Ordovician Epoch
LATE ORDOVICIAN
Marshbrookian Sub-age
MARSHBROOKIAN
Mid Ordovician Epoch
MID ORDOVICIAN
Onnian Sub-age
ONNIAN
Costonian Sub-age
COSTONIAN
Pusgillian Age
PUSGILLIAN
Cheneyan Age
CHENEYAN
Arenig Epoch
ARENIG
Woolstonian Sub-age
WOOLSTONIAN
Sandbian Age
SANDBIAN
Actonian Sub-age
ACTONIAN
Tremadocian Age
TREMADOCIAN
Cautleyan Age
CAUTLEYAN
Llanvirn Epoch [Obsolete concept for epoch]
LLANVIRN [OBSOLETE CONCEPT FOR THIS EPOCH: USE ABEREIDDIAN]
Used when Llanvirn epoch was defined as preceeding the Llandeilo, no longer the accepted BGS definition; use O2 Abereiddian.
Rawtheyan Age
RAWTHEYAN
Streffordian Age
STREFFORDIAN
Soudleyan Sub-age
SOUDLEYAN
Velfreyan Sub-age
VELFREYAN
Permian Period
PERMIAN
Asselian Age
ASSELIAN
Ufimian-Kazanian Age [Obsolete age term]
UFIMIAN-KAZANIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS GUADALUPIAN]
Artinskian Age
ARTINSKIAN
Kungurian Age
KUNGURIAN
Early Permian Epoch [Obsolete age term]
EARLY PERMIAN [OBSOLETE AGE TERM: USE CISURALIAN]
Not on 2009 BGS Geological Time Chart; use PLC Cisuralian.
Cisuralian Epoch
CISURALIAN
Also known as Early Permian Epoch.
Sakmarian Age
SAKMARIAN
Tatarian Age [Obsolete age term]
TATARIAN [OBSOLETE AGE TERM: CLOSEST CURRENT TERM IS LOPINGIAN]
Late Permian Epoch [Obsolete age term]
LATE PERMIAN [OBSOLETE AGE TERM: NO CURRENT DIRECT EQUIVALENT]
Capitanian Age
CAPITANIAN
Wordian Age
WORDIAN
Guadalupian Epoch
GUADALUPIAN
Changhsingian Age
CHANGHSINGIAN
Lopingian Epoch
LOPINGIAN
Roadian Age
ROADIAN
Wuchiapingian Age
WUCHIAPINGIAN
Quaternary Period
QUATERNARY
Quaternary Period [Obsolete concept for period]
QUATERNARY [OBSOLETE CONCEPT FOR THIS PERIOD]
Used when Plio-Pleistocene boundary was placed at 1.806 MA, no longer the accepted BGS definition; use Q Quaternary.
Pleistocene Epoch [Obsolete concept for epoch]
PLEISTOCENE [OBSOLETE CONCEPT FOR THIS EPOCH]
Used when Plio-Pleistocene boundary was placed at 1.806 MA, no longer the accepted BGS definition; use QP Pleistocene.
Calabrian Age
CALABRIAN
Gelasian Age
GELASIAN
Ionian Age
IONIAN
Tarantian Age
TARANTIAN
Anglian Age
ANGLIAN
Contemporaneous with Elsterian; MIS 12; see RR/04/04.
Beestonian Age
BEESTONIAN
Cromerian Age
CROMERIAN
Contemporaneous with Cromerian Complex; MIS 13-21; RR/04/04.
Devensian Age
DEVENSIAN
Contemporaneous with Weichselian; see RR/04/04.
Dimlington Stadial
DIMLINGTON STADIAL
Loch Lomond Stadial (Younger Dryas)
LOCH LOMOND STADIAL (YOUNGER DRYAS)
Windermere Interstadial
WINDERMERE INTERSTADIAL
Baventian Age
BAVENTIAN
Flandrian Age
FLANDRIAN
Holocene Epoch
HOLOCENE
Ipswichian Age
IPSWICHIAN
Contemporaneous with Eemian; MIS 5e; see RR/04/04.
Ludhamian Age
LUDHAMIAN
Contemporaneous with Tiglian A; see RR/04/04.
Marine Isotope Stage 1
MARINE ISOTOPE STAGE 1
Marine Isotope Stage 2
MARINE ISOTOPE STAGE 2
Marine Isotope Stage 3
MARINE ISOTOPE STAGE 3
Marine Isotope Stage 4
MARINE ISOTOPE STAGE 4
Marine Isotope Stage 5a
MARINE ISOTOPE STAGE 5A
Marine Isotope Stage 5b
MARINE ISOTOPE STAGE 5B
Marine Isotope Stage 5c
MARINE ISOTOPE STAGE 5C
Marine Isotope Stage 5d
MARINE ISOTOPE STAGE 5D
Marine Isotope Stage 5e
MARINE ISOTOPE STAGE 5E
Marine Isotope Stage 6
MARINE ISOTOPE STAGE 6
Marine Isotope Stage 7
MARINE ISOTOPE STAGE 7
Marine Isotope Stage 8
MARINE ISOTOPE STAGE 8
Marine Isotope Stage 9
MARINE ISOTOPE STAGE 9
Marine Isotope Stage 10
MARINE ISOTOPE STAGE 10
Marine Isotope Stage 11
MARINE ISOTOPE STAGE 11
Marine Isotope Stage 12
MARINE ISOTOPE STAGE 12
Marine Isotope Stage 13
MARINE ISOTOPE STAGE 13
Marine Isotope Stage 14
MARINE ISOTOPE STAGE 14
Marine Isotope Stage 15
MARINE ISOTOPE STAGE 15
Marine Isotope Stage 16
MARINE ISOTOPE STAGE 16
Marine Isotope Stage 17
MARINE ISOTOPE STAGE 17
Marine Isotope Stage 18
MARINE ISOTOPE STAGE 18
Marine Isotope Stage 19
MARINE ISOTOPE STAGE 19
Marine Isotope Stage 20
MARINE ISOTOPE STAGE 20
Marine Isotope Stage 21
MARINE ISOTOPE STAGE 21
Marine Isotope Stage 22
MARINE ISOTOPE STAGE 22
Marine Isotope Stage 23
MARINE ISOTOPE STAGE 23
Marine Isotope Stage 24
MARINE ISOTOPE STAGE 24
Marine Isotope Stage 25
MARINE ISOTOPE STAGE 25
Marine Isotope Stage 26
MARINE ISOTOPE STAGE 26
Marine Isotope Stage 27
MARINE ISOTOPE STAGE 27
Marine Isotope Stage 28
MARINE ISOTOPE STAGE 28
Marine Isotope Stage 29
MARINE ISOTOPE STAGE 29
Marine Isotope Stage 30
MARINE ISOTOPE STAGE 30
Marine Isotope Stage 31
MARINE ISOTOPE STAGE 31
Marine Isotope Stage 32
MARINE ISOTOPE STAGE 32
Marine Isotope Stage 33
MARINE ISOTOPE STAGE 33
Marine Isotope Stage 34
MARINE ISOTOPE STAGE 34
Marine Isotope Stage 35
MARINE ISOTOPE STAGE 35
Marine Isotope Stage 36
MARINE ISOTOPE STAGE 36
Marine Isotope Stage 37
MARINE ISOTOPE STAGE 37
Marine Isotope Stage 38
MARINE ISOTOPE STAGE 38
Marine Isotope Stage 39
MARINE ISOTOPE STAGE 39
Marine Isotope Stage 40
MARINE ISOTOPE STAGE 40
Marine Isotope Stage 41
MARINE ISOTOPE STAGE 41
Marine Isotope Stage 42
MARINE ISOTOPE STAGE 42
Marine Isotope Stage 43
MARINE ISOTOPE STAGE 43
Marine Isotope Stage 44
MARINE ISOTOPE STAGE 44
Marine Isotope Stage 45
MARINE ISOTOPE STAGE 45
Marine Isotope Stage 46
MARINE ISOTOPE STAGE 46
Marine Isotope Stage 47
MARINE ISOTOPE STAGE 47
Marine Isotope Stage 48
MARINE ISOTOPE STAGE 48
Marine Isotope Stage 49
MARINE ISOTOPE STAGE 49
Marine Isotope Stage 50
MARINE ISOTOPE STAGE 50
Marine Isotope Stage 51
MARINE ISOTOPE STAGE 51
Marine Isotope Stage 52
MARINE ISOTOPE STAGE 52
Marine Isotope Stage 53
MARINE ISOTOPE STAGE 53
Marine Isotope Stage 54
MARINE ISOTOPE STAGE 54
Marine Isotope Stage 55
MARINE ISOTOPE STAGE 55
Marine Isotope Stage 56
MARINE ISOTOPE STAGE 56
Marine Isotope Stage 57
MARINE ISOTOPE STAGE 57
Marine Isotope Stage 58
MARINE ISOTOPE STAGE 58
Marine Isotope Stage 59
MARINE ISOTOPE STAGE 59
Marine Isotope Stage 60
MARINE ISOTOPE STAGE 60
Marine Isotope Stage 61
MARINE ISOTOPE STAGE 61
Marine Isotope Stage 62
MARINE ISOTOPE STAGE 62
Marine Isotope Stage 63
MARINE ISOTOPE STAGE 63
Marine Isotope Stage 64
MARINE ISOTOPE STAGE 64
Marine Isotope Stage 65
MARINE ISOTOPE STAGE 65
Marine Isotope Stage 66
MARINE ISOTOPE STAGE 66
Marine Isotope Stage 67
MARINE ISOTOPE STAGE 67
Marine Isotope Stage 68
MARINE ISOTOPE STAGE 68
Marine Isotope Stage 69
MARINE ISOTOPE STAGE 69
Marine Isotope Stage 70
MARINE ISOTOPE STAGE 70
Marine Isotope Stage 71
MARINE ISOTOPE STAGE 71
Marine Isotope Stage 72
MARINE ISOTOPE STAGE 72
Marine Isotope Stage 73
MARINE ISOTOPE STAGE 73
Marine Isotope Stage 74
MARINE ISOTOPE STAGE 74
Marine Isotope Stage 75
MARINE ISOTOPE STAGE 75
Marine Isotope Stage 76
MARINE ISOTOPE STAGE 76
Marine Isotope Stage 77
MARINE ISOTOPE STAGE 77
Marine Isotope Stage 78
MARINE ISOTOPE STAGE 78
Marine Isotope Stage 79
MARINE ISOTOPE STAGE 79
Marine Isotope Stage 80
MARINE ISOTOPE STAGE 80
Marine Isotope Stage 81
MARINE ISOTOPE STAGE 81
Marine Isotope Stage 82
MARINE ISOTOPE STAGE 82
Marine Isotope Stage 83
MARINE ISOTOPE STAGE 83
Marine Isotope Stage 84
MARINE ISOTOPE STAGE 84
Marine Isotope Stage 85
MARINE ISOTOPE STAGE 85
Marine Isotope Stage 86
MARINE ISOTOPE STAGE 86
Marine Isotope Stage 87
MARINE ISOTOPE STAGE 87
Marine Isotope Stage 88
MARINE ISOTOPE STAGE 88
Marine Isotope Stage 89
MARINE ISOTOPE STAGE 89
Marine Isotope Stage 90
MARINE ISOTOPE STAGE 90
Marine Isotope Stage 91
MARINE ISOTOPE STAGE 91
Marine Isotope Stage 92
MARINE ISOTOPE STAGE 92
Marine Isotope Stage 93
MARINE ISOTOPE STAGE 93
Marine Isotope Stage 94
MARINE ISOTOPE STAGE 94
Marine Isotope Stage 95
MARINE ISOTOPE STAGE 95
Marine Isotope Stage 96
MARINE ISOTOPE STAGE 96
Marine Isotope Stage 97
MARINE ISOTOPE STAGE 97
Marine Isotope Stage 98
MARINE ISOTOPE STAGE 98
Marine Isotope Stage 99
MARINE ISOTOPE STAGE 99
Marine Isotope Stage 100
MARINE ISOTOPE STAGE 100
Marine Isotope Stage 101
MARINE ISOTOPE STAGE 101
Marine Isotope Stage 102
MARINE ISOTOPE STAGE 102
Marine Isotope Stage 103
MARINE ISOTOPE STAGE 103
Antian/Bramertonian Age
ANTIAN/BRAMERTONIAN
Contemporaneous with Tiglian C1-4b; see RR/04/04.
Wolstonian Age
WOLSTONIAN
Contemporaneous with Saalian; MIS 6-10; see RR/04/04.
Pleistocene Epoch
PLEISTOCENE
Pre-Ludhamian Age
PRE-LUDHAMIAN
Pastonian Age
PASTONIAN
Contemporaneous with Tiglian C5-6; see RR/04/04.
Thurnian Age
THURNIAN
Contemporaneous with Tiglian B; see RR/04/04.
Pre-Pastonian Age
PRE-PASTONIAN
Hoxnian Age
HOXNIAN
Contemporaneous with Holsteinian; MIS 11; see RR/04/04.
Early Palaeozoic Sub-era
EARLY PALAEOZOIC
Late Palaeozoic Sub-era
LATE PALAEOZOIC
Palaeozoic Era
PALAEOZOIC
Silurian Period
SILURIAN
Aeronian Age
AERONIAN
Ludfordian Age
LUDFORDIAN
Gorstian Age
GORSTIAN
Homerian Age
HOMERIAN
Llandovery Epoch
LLANDOVERY
Pridoli Epoch
PRIDOLI
Rhuddanian Age
RHUDDANIAN
Sheinwoodian Age
SHEINWOODIAN
Telychian Age
TELYCHIAN
Ludlow Epoch
LUDLOW
Wenlock Epoch
WENLOCK
Triassic Period
TRIASSIC
Anisian Age
ANISIAN
Carnian Age
CARNIAN
Ladinian Age
LADINIAN
Early Triassic Epoch
EARLY TRIASSIC
Induan Age
INDUAN
Scythian Age [Obsolete age term]
SCYTHIAN [OBSOLETE AGE TERM: USE EARLY TRIASSIC]
Not on 2009 BGS Geological Time Chart; use TE Early Triassic.
Mid Triassic Epoch
MID TRIASSIC
Norian Age
NORIAN
Olenekian Age
OLENEKIAN
Rhaetian Age
RHAETIAN
Late Triassic Epoch
LATE TRIASSIC
Geological Time
GEOLOGICAL TIME