The BGS Lexicon of Named Rock Units — Result Details
Waberthwaite Tuff Formation
| Computer Code: | WB | Preferred Map Code: | Wb |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Acid andesitic to dacitic, welded lapilli-tuffs and tuffs; massive, poorly sorted, eutaxitic to parataxitic; intercalations of pyroclastic breccia. | ||
| Definition of Lower Boundary: | At change from rhyolitic (of the Airy's Bridge Tuff Formation) to acid andesitic/dacitic welded tuffs; in part overlies andesites of the Birker Fell Andesite Formation, tuff and lapilli-tuff of the Whinny Bank Formation or the Po House Formation. | ||
| Definition of Upper Boundary: | Defined by base of Duddon Hall Formation at the sharp change to andesitic bedded tuffs. | ||
| Thickness: | Probably around 1100m. Not present east of Baskill Fault. | ||
| Geographical Limits: | Whitfell, Burnmoor, Buck Barrow, Plough Fell, Waberthwaite, Millom Park, Cumbria. (SD 16 93; 14 90;16 90). | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Millom Park Formation [Obsolete Name: Part Of WB]
(MPA)
Waberthwaite Formation [Obsolete Name and Code: Use WB] (-4961) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Peg Crag, Kinmont Buck Barrow, Buck Barrow, Sele Botlam, (Corney Fell, Cumbria). | ||
| Reference(s): | |||
| Millward, D. 2004. A stratigraphical framework for the Upper Ordovician and Lower Devonian volcanic and intrusive rocks in the English Lake District and adjacent areas. British Geological Survey, Research Report: RR/01/007. | |||
| 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. | |||
| Firman, R G J, 1957. The Borrowdale Volcanic Series between Wastwater and Duddon Valley, Cumberland. Proceedings of the Yorkshire Geological Society, Vol.31, p.39-64. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 E048 | |||