The BGS Lexicon of Named Rock Units — Result Details
Whorneyside Tuff Formation
| Computer Code: | WNY | Preferred Map Code: | Wny |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Brown-weatherd, massive eutaxitic andestic lapilli-tuff overlain by laminated and thinly bedded andesitic tuff. Intruded by many contemporaneous andesite sills in part. | ||
| Definition of Lower Boundary: | Base of andesitic lapilli-tuff or, where that is absent, at base of bedded andesitic tuff. Markedly unconformable on the succession of Birker Fell Andesite Formation lavas that range in composition from basalt to dacite. | ||
| Definition of Upper Boundary: | Contact with overlying rhyodacitic rocks in the Airy's Bridge Tuff Formation. | ||
| Thickness: | 0 - 450m | ||
| Geographical Limits: | Whorneyside, Langdale to Scafell, Wasdale, Borrowdale; Coniston Fells, Hard Knott and Duddon Valley, Cumbria. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Whorneyside Formation [Obsolete Name and Code: Use WNY]
(-1925)
Crosby Thwaite Formation [Obsolete Name And Code: Subsumed Within WNY] (CYT) Worm Crag Formation [Obsolete Name: Rocks Now Included In WNY And AIB] (WCF) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Whorneyside Waterfall, Crinkle Crags. | ||
| 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. | |||
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) | |||
| Branney, M J. 1991. Eruption and depositional facies of the Whorneyside Tuff Formation, English Lake District: an exceptionally large-magnitude phreatoplinian eruption. Bulletin of the Geological Society of America, Vol. 103, 886-897. | |||
| Branney, M J, and Kokelaar B P. 1993. The Whorneyside Tuff Formation in the Central Fells. British Geological Survey Technical Report WA/93/40. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 E029 | |||