The BGS Lexicon of Named Rock Units — Result Details

Shetland (Albion) Glacigenic Subgroup

Computer Code: SDAG Preferred Map Code: SHTA
Status Code: Full
Age range: Mid Pleistocene (QPM) — Mid Pleistocene (QPM)
Lithological Description: Sandy diamicton (till), sand, gravel, silt and clay. Clasts are derived predominantly from rocks cropping out on the Shetland archipelago. A suite of glacial, glaciofluvial, glaciolacustrine and organic sediments deposited by ice that radiated from an ice divide positioned along the axis of the archipelago. Mid-Pleistocene (MIS 13-6).
Definition of Lower Boundary: Sharp, unconformable contact with bedrock.
Definition of Upper Boundary: Unconformably overlain by units of the Shetland Glacigenic Subgroup or Holocene deposits, predominantly peat.
Thickness: Up to 10 m.
Geographical Limits: The Shetland archipelago, Foula and Fair Isle.
Parent Unit: Albion Glacigenic Group (ALBI)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Shetland archipelago, Foula and Fair Isle. See also the stratotypes of constituent informal formations documented in Bowen (1999). 
Reference(s):
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
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. 
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