The BGS Lexicon of Named Rock Units — Result Details

Peckmill Sand Member

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 (-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, 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). 
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.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable