The BGS Lexicon of Named Rock Units — Result Details

Roding Silt Member

Computer Code: ROSI Preferred Map Code: SYMB
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: Varies from silt to clay, commonly yellow-brown and massively bedded. [Generic description].
Definition of Lower Boundary: Rests on Kempton Park Gravel river terrace deposit and older bedrock strata.
Definition of Upper Boundary: At surface, and may be overlain by alluvium.
Thickness: Typically 2-3m
Geographical Limits: Thames Valley, restricted to River Roding tributary valley from South Woodford, upstream to Passingford Bridge. May be present farther upstream but none mapped; lateral limits are limits of deposition.
Parent Unit: Maidenhead Formation (MNHD)
Previous Name(s): Roding Silt Formation (-501)
Brickearth (BRK)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Road cutting alongside North Circular Road (Southend Road). 
Reference(s):
British Geological Survey, 1992. Sheet TQ49SW (Woodford Green) Solid and Drift Edition, 1:10000. [Keyworth, Nottingham: British Geological Survey.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E257