| Computer Code: |
PKSA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Thinly interbedded sand, sandy silt, pebbly silty sandy clay, diamicton and gravel, typically red-brown in colour. The member typically drapes older glacial and glaciofluvial deposits, and thickens into hollows and kettleholes in their surface. Synsedimentary small-scale normal faulting and collapse structures are common within the unit. |
| Definition of Lower Boundary: |
Unconformable on older-Quaternary deposits, including the more thickly bedded Gutterfoot Sand and Gravel Member of the Gosforth Glacigenic Formation (in the St Bees Moraine), the coarse-grained, cross-bedded Peel Place Sand and Gravel Member of the Gosforth Glacigenic Formation, at Seascale, and the Fishgarth Wood Till Member of the Gosforth Glacigenic Formation, at Ravenglass. |
| Definition of Upper Boundary: |
Overlain by Holocene deposits such as peat and blown sand. |
| Thickness: |
Typically between 1.0 and 3.0m |
| Geographical Limits: |
Coastal cliff sections between St Bees and Ravenglass on 50k sheets 28 (Whitehaven) and 37 (Gosforth). |
| Parent Unit: |
Gosforth Glacigenic Formation (GOGL)
|
| Previous Name(s): |
Upper Boulder Clay [Obsolete Name and Code: Use FWTI, GOGL, HMTI, PKSA, PLBT, RSTI, STPTG]
(-4662)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Sea cliff sections between 220-950m southeast of southernmost groyne on St Bees beach, c.100-300m southwest of St Bees village, west Cumbria. BGS/Nirex logged sections NX91SE ME4, ME7 anf ME 11: Fig.15 and appendix, Nirex Science Report SA/97/045 (Issue 2.0) 1997. |
| Reference(s): |
| Merritt, J W and Auton, C A. 1997. Quaternary lithostratigraphy of the Sellafield district. Nirex Science Report SA/97/045 (Issue 2.0). [Report prepared for UK Nirex Ltd. 69pp, 5 tables, 20 figures, 14 enclosures and one appendix.] |
| Merritt, J W, Auton, C A, Browne, M A E, Neilson, G and McMillan, A A. 1995. Characterisation of the onshore Quaternary deposits around Sellafield, Cumbria, Phase II. Nirex Science Report 768. |
| Eastwood T, and others. 1968. Geology of the country around Whitehaven. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
