| Computer Code: |
LTHM |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Holocene Epoch (QH)
— Holocene Epoch (QH) |
| Lithological Description: |
Sand, clay and silt with gravel and peat. Gravel becomes dominant in the outer parts of the Mersey Estuary. |
| Definition of Lower Boundary: |
Probably variably underlain by bedrock or deposits of the Caledonia Glacigenic Group. |
| Definition of Upper Boundary: |
At the ground surface. |
| Thickness: |
5 to 25m |
| Geographical Limits: |
Cumbria, Lancashire and north Cheshire. It includes all estuarine deposits of the rivers Lune, Ribble and Mersey. |
| Parent Unit: |
British Coastal Deposits Group (COAS)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Marine and estuarine sediments of the Mersey, Ribble and Lune valleys and the low coast between. Includes the Scrobicularia and Lower Cyclas Clays, Leasowe Marine Bed, Preesall Shingle and coastal peat beds (Thomas in Bowen, 1999). |
| Reference(s): |
| Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene deposits in the British Isles. Geological Society Special Report No.23. |
| 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 |
