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 (-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