| Computer Code: |
SBE |
Preferred Map Code: |
SBE |
| Status Code: |
Full |
| Age range: |
Guadalupian Epoch (PUG)
— Lopingian Epoch (PUL) |
| Lithological Description: |
Anhydrite and/or gypsum, with subordinate dolomite and siltstone, interbedded in cyclical sequences. |
| Definition of Lower Boundary: |
Taken at the point where the "basal breccia" or brockram passes up into grey carbonate-rich siltstones. |
| Definition of Upper Boundary: |
Taken at the base of the overlying red clastic sequence (St. Bees Shales) where red mudstones become predominant over evaporites. |
| Thickness: |
21m in the type section with general range of 0 - 100m in west and south Cumbria. |
| Geographical Limits: |
West and south Cumbria, north Lancashire and east Irish Sea Basin. |
| Parent Unit: |
Cumbrian Coast Group (CCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Borehole NX91SE/190 (Sandwith S9) 1.4 km southwest of Salton Bay, west Cumbria. Depth 160.9 to 181.7 m (Arthurton and Hemingway, 1972). |
| Reference Section |
BGS Roosecote Borehole (SD 26NW/19) (Rose and Dunham, 1977; Smith and others, 1974). |
| Reference(s): |
| Arthurton, R S, and Hemingway, J E. 1972. The St Bees Evaporites - a carbonate evaporite formation of Upper Permian age in west Cumberland, England. Proceedings of the Yorkshire Geological Society, Vol. 38, 565-591. |
| Smith, D B, Brunstrom, R G W, Manning, D I, Simpson, S and Shotton, F W. 1974. A correlation of Permian rocks in the British Isles. Geological Society of London Special Report No. 5. |
| Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. |
| Smith, B. 1924. On the West Cumberland Brockram and its associated rocks. Geological Magazine, Vol.61, 289-308. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E048
|
