The BGS Lexicon of Named Rock Units — Result Details

Western Isles (Albion) Glacigenic Subgroup [Obsolete]

Computer Code: WIAG Preferred Map Code: WIA
Status Code: Full
Age range: Cromerian Stage (QC) — Wolstonian Stage (QO)
Lithological Description: [Obsolete] A suite of glacial, glaciofluvial and glaciolacustrine deposits that contain clasts derived predominantly from Lewisian rocks of the Western Isles, including sandy diamictons (till), sand, gravel, silt and clay. Deposited by ice that mainly radiated outwards from an ice divide positioned along the western seaboard of the Western Isles archipelago. Provisional term listed in McMillan et al. (2005) not required in the present framework.
Definition of Lower Boundary: Sharp, unconformable contact with bedrock.
Definition of Upper Boundary: Planar unconformable contact with units of the Western Isles Glacigenic Subgroup.
Thickness: To 5m
Geographical Limits: The Western Isles archipelago.
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Western Isles archipelago. See also the stratotypes of constituent informal formations documented in Bowen (1999). 
Reference(s):
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. 
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable