The BGS Lexicon of Named Rock Units — Result Details

Alne Glaciolacustrine Formation

Computer Code: ALNE Preferred Map Code: notEntered
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 (-11)
Glacial Lake Deposits (-12)
Glacial Lake Deposits (Including Penecontemporaneous Fluviatile Deposits) (-3163)
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):
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). 
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 maps on which the lithostratigraphical unit is found, and map code used:
E052 E062 E063