| 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 [Obsolete Name and Code: Use PBS, SAB]
(-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
|
