| Computer Code: |
SHWK |
Preferred Map Code: |
Shap |
| Status Code: |
Index Level |
| Age range: |
Albian Age (KA)
— Albian Age (KA) |
| Lithological Description: |
[Obsolete: use BDNS] Calcareous sandstones and calcarenites with several chert horizons in the lower part; glauconitic at most levels. |
| Definition of Lower Boundary: |
Top of mineralised surface (Whitecliff Hardground). |
| Definition of Upper Boundary: |
Erosion surface at base of Cenomanian Limestone. |
| Thickness: |
c.6m. |
| Geographical Limits: |
Devon and West Dorset. Recorded on Sheets 326 (Sidmouth), 327 (Bridport) and 311 Wellington). Now considered obsolete, being a redundnat synonym of the Bindon Sandstone Member. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Chert Beds [Obsolete Name and Code: Use BHC, PECH, COH, SHWK, WHCH]
(*642)
|
| Alternative Name(s): |
Bindon Sandstone Member
|
| Stratotypes: |
| Reference Section |
Beer Head, Beer, Devon. |
| Reference Section |
Whitecliff, Seaton, Devon. |
| Type Section |
Shapwick Quarry, Uplyme, Devon. |
| Reference(s): |
| Edwards, R A, Gallois, R W and Hamblin, R J O. 2004. Geology of the Sidmouth district. Sheet Explanation of the British Geological Survey, Sheets 326 and 340 (England and Wales). |
| Jukes-Browne, A J and Hill, W. 1900. The Cretaceous Rocks of Britain. 1. Gault and Upper Greensand. Memoir of the Geological Survey of Great Britain. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
