The BGS Lexicon of Named Rock Units — Result Details

Hemingbrough Glaciolacustrine Formation

Computer Code: HEM Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Unfossiliferous laminated clays, silts and sands with rare dropstones (typically fine-grained pale coloured sandstone, grey limestone and dark mudstone).
Definition of Lower Boundary: Unconformable, resting directly on bedrock or underlain by basal glaciofluvial deposits.
Definition of Upper Boundary: Either the present land surface or overlain by later superficial deposits, commonly represented by sand deposits of the Breighton Sand Formation or its constituent members.
Thickness: To 30m
Geographical Limits: Present at or near the surface in the Vale of York, from the Escrick Moraine in the north to Doncaster in the south, extending as a concealed unit beneath till deposits to the north of the Escrick Moraine beyond York to approximately 2km east of Knaresbrough.
Parent Unit: North Pennine Glacigenic Subgroup (NPEG)
Previous Name(s): Hemingbrough Glacial Lake Formation (-1591)
Sand Of The 25 Foot Drift (-1592)
Silt And Clay Of The 25 Foot Drift (-4703)
Alternative Name(s): Warp
Type Area  Working clay pit at Hemingbrough [SE 675 316]. Unfossiliferous laminated clays and sands, with dropstones, dposited in an extensive Lake Humber. Thomas, G S P, 1999. 
Cooper, A H and Burgess, I C. 1993. Geology of the country around Harrogate. Memoir for 1:50000 geological sheet 62 (England and Wales). London: HMSO for the British Geological Survey. 
1:50k geological map of Selby (Sheet 71) (in prep): Selby Sheet Explantion (in prep). 
Gaunt, G D. 1994. Geology of the country around Goole, Doncaster and the Isle of Axholme. Memoir of the British Geological Survey, sheets 79 and 88 (England and Wales). 
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. 
British Geological Survey, 1973. Sheet 71 Selby solid and drift/compiled and draw in Leeds Office of the Institute of Geological Sciences - Solid and drft ed. Provisional ed. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E079 E071 E070 E088