The BGS Lexicon of Named Rock Units — Result Details

Hackney Gravel Member

Computer Code: HAGR Preferred Map Code: notEntered
Status Code: Full
Age range: Wolstonian Stage (QO) — Wolstonian Stage (QO)
Lithological Description: Sand and gravel, locally with lenses of silt, clay or peat. [Generic description].
Definition of Lower Boundary: Rests with unconformity on bedrock geology (eg London Clay).
Definition of Upper Boundary: At surface.
Thickness: Average 6m, range to 10m.
Geographical Limits: Thames Valley and associated tributaries.
Parent Unit: Maidenhead Formation (MNHD)
Previous Name(s): Hackney Gravel Formation (-303)
Terrace 3a (-3452)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Hackney Downs. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E256 E257