The BGS Lexicon of Named Rock Units — Result Details

Warmwell Farm Sand Member

Computer Code: WRMS Preferred Map Code: notEntered
Status Code: Full
Age range: Ypresian Age (GY) — Ypresian Age (GY)
Lithological Description: Very fine to fine-grained, locally clayey, sands. Pebble beds composed of well rounded black flints occur at least at two levels.
Definition of Lower Boundary: Lower boundary is taken at the base of a prominent scarp developed on the underlying clays of the West Park Farm Member. The contact is commonly marked by powerful springs. The contact is at the base of erosional channel sands cutting into the underlying West Park Farm Member.
Definition of Upper Boundary: An upward change from sand to silty and sandy bioturbated, olive-grey clay, interbedded with clayey fine to very fine-grained silty sand (considered as the Tilehurst Member, King, in press).
Thickness: 0-6m but up to 15m known.
Geographical Limits: Wareham Basin, East Dorset.
Parent Unit: London Clay Formation (LC)
Previous Name(s): none recorded or not applicable
Alternative Name(s): Kimbridge Formation
Stratotypes:
Type Area  Warmwell Farm, Lychett Matravers, Dorset. Temporary exposures only. Bristow et al. (1991). 
Reference(s):
Bristow, C R, Freshney, E C and Penn, I E. 1991. Geology of the country around Bournemouth. Memoir for 1:50 000 geological sheet 329 (England and Wales). HMSO, London. 
King, C. In press. A correlation of Tertiary rocks in the British Isle and adjacent areas. Special Report of the Geological Society of London, No.12. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E314 E328 E329 E341 E342 E343