Computer Code: |
KNDL |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Ludlow Epoch (SU)
— Pridoli Epoch (SO) |
Lithological Description: |
Comprises a lower sequence of graded siltstone-mudstone couplets with locally extensive intercalations of turbiditic sandstone (Bannisdale Formation). |
Definition of Lower Boundary: |
As for the base of the Bannisdale Formation; gradational from the sandstone-dominated Coniston Group into siltstone and mudstone units. |
Definition of Upper Boundary: |
Unconformably overlain by various Devonian and Carboniferous rocks. |
Thickness: |
Possibly more than 4.2km |
Geographical Limits: |
Northwest England; southern Lake District, Cumbria; Howgill Fells, Cumbria. |
Parent Unit: |
Windermere Supergroup (WIN)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Southern Lake District, Cumbria. All component formations have individually defined stratotypes. |
Reference(s): |
Rickards R B and Woodcock, N H. 2005. Stratigraphical revision of the Windermere Supergroup (Late Ordovician-Silurian) in the southern Howgill Fells, northwest England. Proceedings of the Yorkshire Geological Society, Vol 55. 263-285. |
Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. |
Cocks, L R M, Holland, C H and Rickards, B. 1992. A revised correlation of Silurian rocks in the British Isles. Geological Society of London Special Report. No.21, 32pp. |
King, L M. 1992. A basin study of the early Palaeozoic Windermere Group, northwest England. Unpublished PhD thesis. University of Cambridge. |
Woodcock, N H and Strachan, R A. 2000. Geological History of Britain and Ireland. (Oxford and Edinburgh: Blackwell Science Publishing.) |
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.) |
Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |