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 |