Computer Code: |
DNSH |
Preferred Map Code: |
DnSh |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Ashgill Series (OA) |
Lithological Description: |
Dark grey, partly calcareous, siltstone and mudstone, with thin beds, lenticles or nodules of silty limestone. Poorly fossiliferous sandier beds occur near the top and base; at the base these include debris from the Borrowdale Volcanic Group with the commonly occuring brachiopod Trematis corona ['corona facies'] |
Definition of Lower Boundary: |
Taken at the base of sandstones and siltstones of the 'corona facies', overlying volcaniclastic rocks of the Harthwaite Formation [Borrowdale Volcanic Group] |
Definition of Upper Boundary: |
Overlain by limestones of the Swindale or Keisley limestone formations, or where these are absent, the Ashgill Formation |
Thickness: |
About 400m |
Geographical Limits: |
Restricted to the Cross Fell Inlier, Cumbria |
Parent Unit: |
Dent Group (DNT)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Swindale Beck, Cross Fell Inlier, Cumbria Owen and Rushton, 1999 |
Reference Section |
Harthwaite Sike, Cross Fell, Cumbria Owen and Rushton, 1999 |
Reference Section |
Melmerby Road, Cross Fell Inlier, Cumbria Owen and Rushton, 1999 |
Reference Section |
Pus Gill, Cross Fell Inlier, Cumbria Owen and Rushton, 1999 |
Reference(s): |
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.) |
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.] 131pp. |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E024
E031
E030
|