| Computer Code: |
CCGL |
Preferred Map Code: |
CCG |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Diamicton, gravel, sand, silt and clay, typically yellowish or greyish brown and containing clasts derived from the Lake District, Shap Fell and the Howgill Fells, including welded tuff (Borrowdale Volcanic Group), slate, granite, granophyre, limestone and sandstone. |
| Definition of Lower Boundary: |
Generally unconformable on bedrock, but locally unconformable on older deposits of diamicton, gravel, sand, silt and clay assigned to the Central Cumbria (Albion) Glacigenic Subgroup. |
| Definition of Upper Boundary: |
Generally the ground surface, but commonly overlain unconformably by deposits of gravel, sand, silt, clay and peat of the Solway or Cumbria-Lancashire Catchments subgroups. |
| Thickness: |
Up to 40 m. |
| Geographical Limits: |
The central Lake District, Shap Fell and the Howgill Fells. |
| Parent Unit: |
Caledonia Glacigenic Group (CALI)
|
| Previous Name(s): |
Central Cumbria Drift Group [Obsolete Name And Code: Use CCGL Or CCAG]
(CCDR)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The central Lake District, Shap Fell and the Howgill Fells. Merritt and Auton, 2000. For type sections see details of individual formations and members, including Blengdale Glacigenic Formation, Holmrook Till Member, Threlkeld Till Formation, Lobbs Sand and Gravel Formation and Mosedale Beck Peat Bed. |
| Reference(s): |
| Trotter, F M and Hollingworth, S E, 1932. The glacial sequence in the North of England. Geological Magazine, Vol.69, 374-380. |
| McMillan, A A and Hamblin, R J O, 2000. A mapping-related lithostratigraphical framework for the Quaternary of the UK, Quaternary Newsletter, 92, 21-34. |
| Merrit, J W and Auton, C A. 2000. An outline of the lithostratigraphy and depositional history of Quaternary deposits in the Sellafield district, west Cumbria. Proceedings of the Yorkshire Geological Society, Vol.53, 129-154 |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
