| Computer Code: |
AVF |
Preferred Map Code: |
AVF |
| Status Code: |
Full |
| Age range: |
Ashgill Series (OA)
— Ashgill Series (OA) |
| Lithological Description: |
Rhyolitic tuff within a succession of calcareous siltstones and impure limestones. |
| Definition of Lower Boundary: |
Base of rhyolitic tuff, overlying limestone of the Broughton Moor Formation or, where absent, the Kirkley Bank Formation. |
| Definition of Upper Boundary: |
Defined by base of overlying calcareous siltstones/impure limestones. |
| Thickness: |
0 to 5m |
| Geographical Limits: |
Windermere to Broughton Mills, Cumbria. |
| Parent Unit: |
Dent Group (DNT)
|
| Previous Name(s): |
Rhyolitic Ash [Obsolete Name and Code: Use AVF]
(-1961)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Sheet 38, Ambleside, near Appletreeworth. |
| Reference(s): |
| 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. |
| Millward, D, Johnson, E W, Beddoe-Stephens, B, Young, B, Kneller, B C, Lee, M K, Fortey, N J, Allen, P M, Branney, M J, Cooper, D C, Hirons, S, Kokelaar, B P, Marks, R J, McConnell, B J, Merritt, J W, Molyneux, S G, Petterson, M G, Roberts, B, Rundle, C C, Rushton, A W A, Scott, R W, Soper, N J, and Stone, P. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, England and Wales, Sheet 38. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E038
|
