The BGS Lexicon of Named Rock Units — Result Details

Grampian Catchments Subgroup

Computer Code: GRCA Preferred Map Code: GRC
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: A suite of fluvial, lacustrine, mass movement, periglacial and aeolian deposits that contain clasts derived from rocks cropping out in the eastern Grampian Mountains and Buchan, including alluvium, river terrace deposits, peat, head and blown sand.
Definition of Lower Boundary: Unconformable contact with units of the Central Grampian, East Grampian, Inverness, Banffshire Coast and Caithness, and Logie-Buchan Glacigenic subgroups, and with bedrock.
Definition of Upper Boundary: Generally the ground surface, but units of this Subgroup locally interfinger with units of the British Coastal Deposits Group.
Thickness: To 25m
Geographical Limits: The Eastern Grampian Highlands and Buchan.
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Eastern Grampian Highlands and Buchan. Bowen, 1999. See also the stratotypes of constituent formations. 
Reference(s):
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
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.] 
McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable