The BGS Lexicon of Named Rock Units — Result Details

Gerrards Cross Gravel

Computer Code: GCGR Preferred Map Code: notEntered
Status Code: Full
Age range: Cromerian Stage (QC) — Anglian Stage (QA)
Lithological Description: Sand and gravel, locally with lenses of silt, clay or peat and organic material. [Generic description].
Definition of Lower Boundary: Rests unconformably on bedrock geology.
Definition of Upper Boundary: At surface.
Thickness: 1-10m, average 4m thick.
Geographical Limits: Ancestral Thames course (Vale of St. Albans).
Parent Unit: Sudbury Formation (SBRY)
Previous Name(s): Gerrards Cross Gravel Formation (-4058)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Quarry face at Gerrards Cross Quarry. 
Reference(s):
Gibbard, P L, 1985. Pleistocene history of the Middle Thames Valley. (London: Cambridge University Press.) 
Strange, P J, 1992. A new nomenclature for the River Terrace Deposits of North London. British Geological Survey Technical Report, WA/92/52. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E256 E268