The BGS Lexicon of Named Rock Units — Result Details

Shirdley Hill Sand Formation

Computer Code: SSA Preferred Map Code: SSA
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: Moderately to well-sorted, fine-grained sand with peat layers in the lower part. Sand grains are dominated by rounded to sub-rounded quartz grains. The formation is divisible into an upper "white" sand and a lower "brown" sand that is olive grey and brown. The sediments are interpreted as coastal blown sands, possibly a coastal facies of the Seacombe Sand Formation.
Definition of Lower Boundary: Variably overlies sediments of the Caledonia Glacigenic Group.
Definition of Upper Boundary: Either the ground surface or basal surface of overlying peat deposits.
Thickness: <1 to 5m.
Geographical Limits: Discontinuous distribution in Lancashire and Merseyside between Wigan, Liverpool and Southport.
Parent Unit: British Coastal Deposits Group (COAS)
Previous Name(s): Shirdly Hill Formation (-2446)
Shirdly Hill Sand (-2447)
Alternative Name(s): none recorded or not applicable
Type Section  Shirdley Hill. De Rance, 1869. 
De Rance, C E. 1869. Geology of the country between Liverpool and Southport. Memoir of the Geological Survey of the United Kingdom. 
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. 
Wilson, P, Bateman, R M and Catt, J A. 1981. Petrography, origin and environment of the Shirdley Hill Sand of southwest Lancashire, England. Proceedings of the Geologists' Association, Vol.92, No.4, 211-229. 
Jones, R C B, Tonks, L H and Wright, W B, 1938. Wigan District. Memoir of the Geological Survey of Great Britain. England and Wales Sheet 84. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: