Computer Code: |
BBF |
Preferred Map Code: |
BBF |
Status Code: |
Full |
Age range: |
Tremadoc Series (O1)
— Tremadoc Series (O1) |
Lithological Description: |
Siltstone and mudstone with subordinate sandstone beds. |
Definition of Lower Boundary: |
Not seen, thrust faulted over Kirkstile Formation. |
Definition of Upper Boundary: |
Rapid interbedded transition to Watch Hill Formation. (NY 149 316). |
Thickness: |
c.250m at Bitter Beck, up to 600m (very poorly exposed) south of Cockermouth (northwest corner of Map NY12). |
Geographical Limits: |
Not defined. |
Parent Unit: |
Skiddaw Group (SKG)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Bitter Beck. Base not seen. |
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.) |
Molyneux, S G and Rushton, A W A, 1988. The age of the Watch Hill Grits (Ordovician), English Lake District. Transactions of the Royal Society of Edinburgh, Earth Sciences, Vol.79 (1), p.43-69. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E023
E022
E029
E028
|