The BGS Lexicon of Named Rock Units — Result Details

Pulborough Sandrock Member

Computer Code: PBS Preferred Map Code: PSk
Status Code: Full
Age range: Aptian Age (KP) — Aptian Age (KP)
Lithological Description: Uniformly fine-grained, friable, well-sorted, fossiliferous sandstone; rarely cross-bedded, grey when fresh, yellowish-brown when weathered. Sparse coarse grains can be present near base. Coarse ferruginous sand locally present at top. Thin clay beds in places.
Definition of Lower Boundary: The lower boundary is identified at the upward change from poorly sorted sands, typically pebbly, limonitic and/or clayey (locally at a pebbly sandy clay), of the Fittleworth Member, Selham Ironshot Sands Member or the Rogate Member, to dominantly fine-grained, well-sorted sands.
Definition of Upper Boundary: In the type area, the upper boundary is taken at the top of a thin cemented ironstone beneath the clays and silts of the Marehill Clay Member; around Petersfield it is at the change from mainly sand to mainly grey silty clay in a short gradational sequence.
Thickness: 0 to 35m.
Geographical Limits: Southwest Weald; eastern limit is Storrington, West Sussex [TQ 07 14]; northern limit not yet known.
Parent Unit: Sandgate Formation (SAB)
Previous Name(s): Sandgate Beds (-443)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Railway cutting on north side of Pulborough, West Sussex. The whole of the member traversed by the cutting but access is difficult and the section is vegetated. 
Partial Type Section  Road cuttings on north side of Pulborough, West Sussex. Numerous cuttings up to 3m high display parts of the member. 
Reference(s):
Woolridge, S W. 1928. Report of the Weald Research Committee. Proceedings of the Geologists' Association, Vol.39, 223-237. 
Bristow, C R. 1991. Geology of the Petersfield District, Hampshire. Explanation of 1:10,000 Geological sheets SU72NW, 72NE, 72SW, 72SE, 82NW and 82SW. British Geological Survey Technical Report, WA/91/24. 
Kirkaldy, J F. 1933. The Sandgate Beds of the Western Weald. Proceedings of the Geologists' Association, Vol.44, 270-311. 
Bristow, C R and Wyatt, R J. 1983. Geological notes and local details for 1:10 000 sheets TQ01NW, NE, SW and SE (Pulborough and Storrington). British Geological Survey Technical Report, WA/VG/83/03. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E300 E317 E332