British Geological Survey (BGS) Lexicon
The British Geological Survey (BGS) Lexicon of Named Rock Units, or BGS Lexicon, provides our definitions of the lithostratigraphic, lithodemic and lithomorphogenetic geological units of the UK and its continental shelf. The lexicon focuses mainly on geological units of member, formation and group rank (and equivalent) but it also includes information on some units of lesser rank, notably economically important coal seams and laterally extensive marine bands. It includes superficial and bedrock units, plus synonyms and other names that are not currently recognised by the BGS or regarded as obsolete. The BGS lexicon is an authoritative source for names of and information about lithostratigraphic units in the United Kingdom.
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Coverage and gaps
Lithostratigraphy of the UK and surrounding continental shelf