The BGS Lexicon of Named Rock Units — Result Details

Britannia Catchments Group

Computer Code: BCAT Preferred Map Code: CAT
Status Code: Full
Age range: Mid Pleistocene Epoch (QPM) — Holocene Epoch (QH)
Lithological Description: Clays, silt, sands, gravels and peat. Gravels are composed of clasts derived from rocks cropping out throughout Great Britain and the Isle of Man.
Definition of Lower Boundary: Unconformable contact with units of the Albion Glacigenic Group, the Caledonia Glacigenic Group, the Dunwich Group, the Crag Group or bedrock.
Definition of Upper Boundary: Generally the ground surface, but locally units of this group interfinger with units of the British Coastal Deposits Group.
Thickness: Up to 100 m.
Geographical Limits: Great Britain and the Isle of Man.
Parent Unit: Great Britain Superficial Deposits Supergroup (GBG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Great Britain. 
Reference(s):
McMillan, A A, Hamblin, R J O and Merritt, J W. 2004. An overview of the lithostratigraphical framework for Quaternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report. RR/04/04. 
Bowen, D Q (Editor). 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society of London Special Report, No.23. 
Boulton, G S. 1992. Quaternary. 413-444 in Duff, P M D and Smith, A J (eds) Geology of England and Wales. [London: The Geological Society.] 
Boulton, G S, Peacock, J D and Sutherland, D G. 2002. Quaternary. 409-430 in Trewin, N H [editor], Geology of Scotland. [4th edition]. [London: The Geological Society.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable