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Lexicon spatial scopes
BGS Lexicon of Named Rock Units: Spatial Scope of Definitions
General
Local
Local (definition applies only to part of the outcrop). Local applicability should be used where a definition is provided for a wide-ranging unit on the basis of its first modern mapping in a relatively small area; the definition (based on the modern mapping) is assumed to have only "local" validity when first provided. Further information from eventual more widespread mapping should allow confirmation, augmentation and/or revision of th
Not applicable
Universal
Universal (definition applies to whole formation in the United Kingdom, at outcrop and subcrop, onshore and offshore).
Wider
Wider applicability is used more rarely for definitions recognised as having a wider validity than the UK. Relatively few will be considered for this status, but the option remains available.