The BGS Lexicon of Named Rock Units — Result Details

Clackmannan Group

Computer Code: CKN Preferred Map Code: CKN
Status Code: Full
Age range: Brigantian Substage (CX) — Langsettian Substage (CA)
Lithological Description: Sequences of sandstones, siltstones, mudstones, limestones, ironstones, coals and seatrocks; commonly cyclic; marine faunas common in lower parts of cycles.
Definition of Lower Boundary: Drawn at base of lowest limestone of the Lower Limestone Formation; normally conformable.
Definition of Upper Boundary: Drawn at conformable upward passage from Passage Formation to Lower Coal Measures.
Thickness: Up to about 1500m.
Geographical Limits: Midland Valley of Scotland.
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  See type sections of component units: Lower Limestone Formation, Limestone Coal Formation, Upper Limestone Formation; other formations in Ayrshire (eg Lower Limestone Formation, TS: Wester Gartshore Borehole NS67SE/99, from 82-293m depth. 
Type Area  Clackmannan Syncline, Scotland. 
Reference(s):
Cameron, I B and Stephenson, D, 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey). 
Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Aidrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S012 S015 S015 S023 S024 S033 S034 S049 S040 S030 S030 S039 S039 S040 E001 E002