The BGS Lexicon of Named Rock Units — Result Details

Dollis Hill Gravel Member

Stratotypes:
Computer Code:	DHGR	Preferred Map Code:	notEntered
Status Code:	Full
Age range:	Cromerian Stage (QC) — Anglian Stage (QA)
Lithological Description:	Gravel, sandy and clayey in part, with laminated beds of silty clay, peat and organic material.
Definition of Lower Boundary:	Rests unconformably on bedrock geology.
Definition of Upper Boundary:	Overlain by Anglian Till in many places; otherwise at surface.
Thickness:	1-15 m.
Geographical Limits:	Tributary of ancestral River Thames in the Finchley - Hoddesdon area of North London.
Parent Unit:	Sudbury Formation (SBRY)
Previous Name(s):	Dollis Hill Gravel Formation [Obsolete Name and Code: Use DHGR] (-3359) Glacial sand and gravel [Obsolete Name and Code] (GSG)
Alternative Name(s):	none recorded or not applicable
Type Section	Temporary exposure on Dollis Hill [TQ 2353 8825] near Hendon (Gibbard, 1979).
Reference(s):
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp.
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. 1979. Middle Pleistocene drainage in the Thames Valley. Geological Magazine, Vol. 116, 35-44.
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E256