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): Silt And Clay Of The 25 Foot Drift (-4703)
Hemingbrough Glacial Lake Formation (-1591)
Sand Of The 25 Foot Drift (-1592)
Alternative Name(s): Warp
Stratotypes:
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. 
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. 
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). 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E079 E071 E070 E088