The BGS Lexicon of Named Rock Units — Result Details
Beck Wood Tuff Member
| Computer Code: | BWT | Preferred Map Code: | BWT |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Rhyolitic tuff - densely welded. | ||
| Definition of Lower Boundary: | Base of rhyolitic tuff that rests on an erosion surface cut in dacitic lapilli-tuff (Waberthwaite Tuff Formation). | ||
| Definition of Upper Boundary: | Top of rhyolitic tuff - probably an erosion surface - at contact with overlying dacitic lapilli-tuff of the Waberthwaite Tuff Formation. | ||
| Thickness: | 60-90m | ||
| Geographical Limits: | Outcrop in Beck Wood, 500m west of Beck Farm, near Millom, Cumbria. | ||
| Parent Unit: | Waberthwaite Tuff Formation (WB) | ||
| Previous Name(s): | Harrath Tuffs and Lavas [Obsolete Name and Code: Use BWT, HHT]
(-3886)
The Upper Tuffs (-739) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Outcrop in Beck Wood, 500m west of Beck Farm, near Millom, 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 Unpublished Ph.D. thesis, University of Sheffield.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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E048 | |||