The BGS Lexicon of Named Rock Units — Result Details

Ilford Silt Member

Computer Code: ILSI Preferred Map Code: SYMB
Status Code: Full
Age range: Wolstonian Stage (QO) — Wolstonian Stage (QO)
Lithological Description: Sandy clay and silt.
Definition of Lower Boundary: Rests on Taplow Gravel, Hackney Gravel and Boyn Hill Gravel river terrace deposits.
Definition of Upper Boundary: At surface.
Thickness: Typically 1-3m but upto 6m, possibly more.
Geographical Limits: Thames Valley, north shore, from Ilford, possibly as far as Grays.
Parent Unit: Maidenhead Formation (MNHD)
Previous Name(s): Ilford Silt Formation (-978)
Brickearth (BRK)
Grays Brickearth (-4111)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Old brickpits, Ilford to Seven Kings. 
Reference(s):
British Geological Survey, 1993. Sheet TQ48NW (Redbridge), solid and drift edition, 1:10000. [Keyworth, Nottingham, British Geological Survey.] 
Bridgland, D R, 1994. Quaternary of the Thames. [Chapman Hall.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E257