| Computer Code: |
BKSH |
Preferred Map Code: |
BKSH |
| Status Code: |
Full |
| Age range: |
Ashgill Series (OA)
— Telychian Age (ST) |
| Lithological Description: |
Black hemipelagic mudstone; grey mudstone with minor wacke sandstone. |
| Definition of Lower Boundary: |
Conformable on Upper Hartfell Shale Formation. |
| Definition of Upper Boundary: |
Conformably overlain by wacke sandstones of the Gala Group |
| Thickness: |
40m |
| Geographical Limits: |
Southern Uplands of Scotland and Longford Down Inlier, Northern Ireland. |
| Parent Unit: |
Moffat Shale Group (MFS)
|
| Previous Name(s): |
Birkhill Shales
(-63)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Dobb's Linn section, Moffatdale, Dumfriesshire Lapworth, 1878 |
| Reference(s): |
| Lapworth, C, 1877. The Moffat Series. Quarterly Journal of the Geological Society of London, Vol.34, 240-346. |
| Floyd, J D, 2001. The Southern Uolands Terrane: a stratigraphical review. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.91, 349-362. |
| Floyd, J D, 1996. Lithostratigraphy of the Ordovician rocks in the Southern Uplands: Crawford Group, Moffat Shale Group, Leadhills Supergroup. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.86, 153-165. |
| Webb, B C, Rushton, A W A and White, D E. 1993. Moffatdale and the upper Ettrick valley. Description of the solid geology of parts of 1:25000 sheets NT10, 11, 20 and 21. Classical Areas of British Geology. (London: British Geological Survey, HMSO.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S017
S024
S015
S015
|
