The BGS Lexicon of Named Rock Units — Result Details
Downton Farm Gravel Member
| Computer Code: | DOWNF | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Pleistocene Epoch (QP) — Pleistocene Epoch (QP) | ||
| Lithological Description: | Generally clayey sandy gravel with sand beds of limited lateral extent. Is known to include peat and macrofaunal debris. | ||
| Definition of Lower Boundary: | Erosional base on bedrock. | ||
| Definition of Upper Boundary: | Current land surface. | ||
| Thickness: | Generally between 2 and 5m thick. | ||
| Geographical Limits: | The member is mapped in the unnamed tributary valley between Shippards Chine and Brighstone that parallels the south-western cliffs of the Isle of Wight. The confluent area with the major Western Yar Valley is absent due to coastal erosion. | ||
| Parent Unit: | Western Yar River Formation (WYAR) | ||
| Previous Name(s): | Valley Brickearth
(-5114)
Gravel terrace [Obsolete Name and Code: Use KINGM, DOWNF, BACKC] (-217) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Member mapped within small valley parallel to the south-west coast of the Isle of Wight between Shippards Chine and Brighstone. This headwater stream disassociated from the main Western Yar stream due to coastal erosion. | ||
| Reference(s): | |||
| British Geological Survey. 1976. Isle of Wight. England and Wales Special Sheet incorporating parts of sheets 330, 331, 344, 345. Bedrock and Drift 1:50 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| White, H J O. 1921. A short account of the geology of the Isle of Wight. Memoir of the Geological Survey of Great Britain, (1994 reprint). | |||
| British Geological Survey. 2013. Isle of Wight. England and Wales Special Sheet incorporating parts of sheets 330, 331, 344, 345. Bedrock and Superficial Deposits. 1:50 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| Hopson, P M, and Farrant A R. 2014. Geology of the Isle of Wight - a brief explanation of the Isle of Wight Special Geological Map Sheet. Sheet Explanation of the British Geological Survey. Parts of 1:50 0000 Sheets 330 (Lymington), 331 (Portsmouth), 344 (Chale) and 345 (Ventnor) (England and Wales) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||