| Computer Code: |
BOHI |
Preferred Map Code: |
BOHI |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Chadian Substage (CI) |
| Lithological Description: |
The Bowland High Group (platform and ramp carbonate facies) comprises the Chatburn Limestone and Clitheroe Limestone formations, located within a restricted area of the Craven Basin. Lateral continuity with the Great Scar Limestone Group of the Askrigg Block cannot be demonstrated, and as a result a distinct group name has been proposed.
Pale to dark grey, packstone and wackestone with subordinate grainstones, partings and thin beds of calcareous mudstone and calcareous siltstone. Mudmound reef (Waulsortian) limestones are present in the upper part of the group.
The depositional environment of the shallow shelf platform carbonate subfacies is a tropical shallow marine environment.
The depositional environment of the ramp carbonate subfacies is on the ramps that generally develop during the early stage of platform carbonate evolution. They represent deposits upon gently inclined shallow marine slopes that may be marginal to platforms.
Tournaisian to Chadian. |
| Definition of Lower Boundary: |
The base of the group has not been proved. |
| Definition of Upper Boundary: |
The group is overlain unconformably by the Craven Group. |
| Thickness: |
The Bowland High Group has a minimum thickness of about 2300 m. |
| Geographical Limits: |
The Craven Basin between Clitheroe and Skipton. |
| Parent Unit: |
Carboniferous Limestone Supergroup (CL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Clitheroe, Lancashire, -see component Chatburn Limestone and Clitheroe Limestone formations for reference sections. Earp et al., 1961; Fewtrell and Smith, 1980. |
| Reference(s): |
| Earp, J R, Magraw, D, Poole, E G, Land, D H and Whiteman, A J, 1961. Geology of the country around Clitheroe and Nelson. Memoir of the Geological Survey of Great Britain, Sheet.68, England and Wales, pp.346. |
| Waters, C N, Browne, M A E, Dean, M T and Powell, J H. 2007. Lithostratigraphical framework for Carboniferous successions of Great Britain (Onshore). British Geological Survey Research Report, RR/07/01. |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| George, T N, Johnson, G A L, Mitchell, M, Prentice, J E, Ramsbottam, W H C, Sevastopulo, G D and Wilson, R B. 1976. A correlation of the Dinantian rocks of the British Isles. Special Report of the Geological Society of London, No 7. |
| Fewtrell, M D and Smith, D G, 1980. Revision of the Dinantian stratigraphy of the Craven Basin, N. England. Geological Magazine, Vol.117, p.37-49. |
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E059
E060
E061
E067
E068
E069
|
