The BGS Lexicon of Named Rock Units — Result Details
Alne Glaciolacustrine Formation
Computer Code: | ALNE | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Devensian Stage (QD) — Devensian Stage (QD) | ||
Lithological Description: | Laminated clay with silt (varved) and subordinate fine-grained sand beds, plus a little marginal sand and gravel. | ||
Definition of Lower Boundary: | Unconformable on the Vale of York Formation and locally on bedrock. | ||
Definition of Upper Boundary: | The present land surface or the base of the Sutton Sand Formation, or other "cover" sand deposits. | ||
Thickness: | To 22m | ||
Geographical Limits: | Vale of York north of York Moraine as far north as Thirsk, west to Littlethorpe and Hunsingore, east to Stockton on the Forest. Lake deposits generally below +30m AOD, down to +14m AOD in the lowest area near York. | ||
Parent Unit: | North Pennine Glacigenic Subgroup (NPEG) | ||
Previous Name(s): | Alne Glacial Lake Formation [Obsolete Name and Code: Use ALNE]
(-11)
Glacial lake deposits [Obsolete Name and Code: Use GLLD] (-12) Glacial lake deposits (including penecontemporaneous fluviatile deposits) [Obsolete Name and Code: Use ALNE] (-3163) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Alne Clay Pit, about 3.5km southsouthwest of Easingwold, North Yorkshire. Section exposing: Soil and sandy clay up to 0.9m depth. Brown to greenish grey, well laminated, stone-free clay 5.5m depth on dark brown laminated, stone-free clay with thin brown silt laminae to 8.5m. Cooper and Burgess, 1993. | ||
Reference(s): | |||
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. | |||
Powell, J H, Cooper, A H C and Benfield, A C. 1992. Geology of the country around Thirsk. Memoir of the British Geological Survey, Sheet 52 (England and Wales). | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E052 E062 E063 |