| Computer Code: |
STAD |
Preferred Map Code: |
STaD |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Dacite lava flow. Porphyritic, flow laminated, white to pink-weathered. |
| Definition of Lower Boundary: |
Junction with underlying unnamed andesite sheets in the Birker Fell Andesite Formation. |
| Definition of Upper Boundary: |
Junction with overlying tuffs or ignimbrites of the Craghouse Member. |
| Thickness: |
200m |
| Geographical Limits: |
Seatallan - Haycock area, west of Wasdale, Cumbria. |
| Parent Unit: |
Birker Fell Andesite Formation (BFA)
|
| Previous Name(s): |
Dacite Group [Obsolete Name and Code: Use STAD]
(-4344)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Seatallan 4.5km west of Wasdale Head. |
| Reference Section |
Between summit of Haycock and Scoat Tarn. |
| Reference(s): |
| 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. |
| Clark, L, 1964. The Borrowdale Volcanic Series between Buttermere and Cumberland. Proceedings of the Yorkshire Geological Society, Vol.34, p.343-356. |
| Petterson, M G, Beddoe-Stephens, B, Millward, D and Johnson, E W, 1992. A pre-caldera plateau-andesite field in the Borrowdale Volcanic Group of the English Lake District. Journal of the Geological Society, London, Vol. 149, 889-906. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E038
E037
E029
|
