| Computer Code: |
SPR |
Preferred Map Code: |
Spr |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Interbedded coarse-grained pebbly volcaniclastic sandstone, planar bedded and cross-bedded. Includes units of banded andesitic tuff (pyroclastic fall-out deposits) and a succession of silicic tuff and lapilli-tuff (pyroclastic fall-out and density current deposits (the Glaramara Tuff). The facies associated separates this from the underlying Cockley Pike Member |
| Definition of Lower Boundary: |
The gradational base is taken at the first appearance of pyroclastic rocks in the sandstone succession |
| Definition of Upper Boundary: |
Defined by the base of the overlying silicic pyroclastic rocks of the Lincomb Tarns Formation. The contact varies from conformable and with angular discordance |
| Thickness: |
Up to 70m |
| Geographical Limits: |
From High Raise to Scafell and Langdale, probably also present in the Tiberthwaite, Coniston area, Lake District, Cumbria |
| Parent Unit: |
Seathwaite Fell Sandstone Formation (SET)
|
| Previous Name(s): |
Sprinkling Tarn Member [Obsolete Name and Code: Use SPR]
(-4899)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Sprinkling Tarn, Scafell area, Cumbria Kneller and McConnell, 1993 |
| Reference(s): |
| Kneller B C and McConnell, B J . 1993. The Seathwaite Fell Formation in the central Fells. British Geological Survey Technical Report WA/93/43 |
| 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: |
| none recorded or not applicable |
