The BGS Lexicon of Named Rock Units — Result Details

Langley Silt Member

Computer Code: LASI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Varies from silt to clay, commonly yellow-brown and massively bedded. [Generic description].
Definition of Lower Boundary: Rests on sand and gravel River Terrace Deposits, with sharp base.
Definition of Upper Boundary: At surface.
Thickness: 1-5m, average 3m.
Geographical Limits: Thames Valley from Goring to Thames Estuary.
Parent Unit: Maidenhead Formation (MNHD)
Previous Name(s): Langley Silt Formation (-2889)
Brickearth (BRK)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Gravel pit at Langley, Berks. 
Reference(s):
Strange, P J, 1992. A new nomenclature for the River Terrace Deposits of North London. British Geological Survey Technical Report, WA/92/52. 
Gibbard, P L, 1985. Pleistocene history of the Middle Thames Valley. (London: Cambridge University Press.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E256 E268 E269