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 [Obsolete Name and Code: Use ILSI] (-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, 1:10 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| Bridgland, D R (editor). 1994. Quaternary of the Thames. (London: Chapman Hall.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E257 | |||