The BGS Lexicon of Named Rock Units — Result Details
Whinny Bank Tuff Formation
| Computer Code: | WNB | Preferred Map Code: | WnB |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Interbedded succession of silty mudstone and andesitic lapilli-tuff; the proportion of andesitic lapilli increases up the succession. Much of the silty mudstone occurs as abraded pellets and accretionary lapilli, suggesting a pyroclastic origin. | ||
| Definition of Lower Boundary: | Unconformity. Overlies erosion surface on Skiddaw Group. | ||
| Definition of Upper Boundary: | Base of overlying Po House Formation (bedded tuff) or Waberthwaite Formation (dacitic tuff and lapilli-tuff). | ||
| Thickness: | 0-300m | ||
| Geographical Limits: | Whicham Valley:- between Broadgate (SD 180 867) and Lacra Bank (SD 145 815), Cumbria. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Whinny Bank Formation [Obsolete Name and Code: Use WNB]
(-1281)
Whinneybank Tuffite [Obsolete Name and Code: Use WNB] (-1923) Mottled Shale [Obsolete Name and Code: Use GCOE, WNB] (-4670) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Whinney Bank, 1km west of The Green, Millom, South Cumbria. | ||
| Reference(s): | |||
| Mathieson, N A, 1986 Geology, structure and geochemistry of the Ordovician volcanic succession in south west Cumbria. Unpublished Ph.D. thesis, University of Sheffield. | |||
| Green, J F N, 1913. The older Palaeozoic succession of the Dudden Estuary. London, 23pp. | |||
| British Geological Survey. 1994b. Millom Park, SD18SE, Solid and Drift, 1:10 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. | |||
| British Geological Survey. 1994a. Duddon Bridge and Hallthwaites, SD18NE, Solid and Drift 1:10 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E048 | |||