The BGS Lexicon of Named Rock Units — Result Details

Central Grampian Glacigenic Subgroup

Stratotypes:
Computer Code:	CGDR	Preferred Map Code:	CG
Status Code:	Full
Age range:	Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description:	Diamicton, sands, gravels and silts. Clasts mainly derived from Central Highland Migmatite Complex and Caledonian igneous rocks. deposited by ice that (mainly) radiated out from a centre over Rannoch Moor.
Definition of Lower Boundary:	Unconformable on bedrock.
Definition of Upper Boundary:	Generally the ground surface.
Thickness:	Generally 5 - 10 m, but locally 30 m or more.
Geographical Limits:	The Grampian Highlands as far as Strath Spey, the Cairngorm Mountains and Gaick Plateau to the east, Strathmore, Monteith and Loch Lomond to the south, including the Inner Hebrides to the south of Mull.
Parent Unit:	Caledonia Glacigenic Group (CALI)
Previous Name(s):	Central Grampian Glacigenic Group [Obsolete Name and Code: Use CGDR] (-3294) Central Grampian Drift Group [Obsolete Name and Code: Use IAG] (-772)
Alternative Name(s):	none recorded or not applicable
Type Area	Sheet 63E (Dalwhinnie).
Partial Type Section	Sheet 84W (Fortrose). See also type sections of component formations.
Reference(s):
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp.
Merritt, J W, 1999. The Quaternary geology of the Dalwhinnie District. British Geological Survey Technical Report WA/99/14R.
Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland)
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S096 S062 S063 S063 S064 S074 S074 S072 S082 S062

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