| Computer Code: |
SWL |
Preferred Map Code: |
SwL |
| Status Code: |
Full |
| Age range: |
Ashgill Series (OA)
— Ashgill Series (OA) |
| Lithological Description: |
Grey nodular limestone with intercalations of pale grey mudstone with limestone nodules |
| Definition of Lower Boundary: |
Taken at the base of limestone unconformably overlying mudstone of the Dufton Shale Formation. The extent of the unconformity is appreciated only from the faunal evidence |
| Definition of Upper Boundary: |
Taken at the base of mudstones belonging to the unconformably overlying Ashgill Formation |
| Thickness: |
About 19m |
| Geographical Limits: |
Restricted to the Cross Fell Inlier, Cumbria |
| Parent Unit: |
Dent Group (DNT)
|
| Previous Name(s): |
Staurocephalus Limestone [Obsolete Name and Code: Use SWL, CYO]
(-3345)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Swindale Beck, Cross Fell Inlier, Cumbria. Owen and Rushton, 1999. |
| Reference Section |
Melmerby Road, [A686, Penrith to Alston), Cumbria. Owen and Rushton, 1999. |
| Reference(s): |
| Owen, A W and Rushton, A W A, 1999. Arenig to Ashgill of northern England. pp 259-292 in Rushton, A W A, Owen, A W, Owens, R M, and Prigmore, J K. British Cambrian to Ordovician stratigraphy. Geological Conservation Review, Vol. 18. Joint Nature Conservation Committee. Peterborough. |
| Burgess, I C, and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). (London: HMSO.) 131 pp. |
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
| Arthurton, R S, and Wadge, A J. 1981. Geology of the country around Penrith. Memoir for geological sheet 24. Institute of Geological Sciences, London, HMSO. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E031
E024
E030
|
