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 [Obsolete Name and Code: Use HEM]
(-1591)
Sand of the 25 Foot Drift [Obsolete Name and Code: Use HEM] (-1592) Silt and clay of the 25 Foot Drift [Obsolete Name and Code: Use HEM] (-4703) |
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| Alternative Name(s): | Warp |
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| 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): | |||
| 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 drawn in Leeds Office of the Institute of Geological Sciences - Solid and drift 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 | |||