The BGS Lexicon of Named Rock Units — Result Details
Ulpha Andesite Formation
| Computer Code: | ULP | Preferred Map Code: | Ulp |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Andesite, plagioclase-phyric lavas with thin interbeds of volcaniclastic rocks. | ||
| Definition of Lower Boundary: | Base of plagioclase-phyric andesite lava, unconformably overlying the Duddon Hall Tuff Formation (bedded air-fall tuff) and Holehouse Gill Mudstone Formation (mudstone and sandstone). | ||
| Definition of Upper Boundary: | Defined by bases of overlying formations including Wallowbarrow Tuff Formation (andesitic lapilli tuff) and Dunnerdale Sandstone Formation (volcaniclastic sandstone). | ||
| Thickness: | 0 - 800m | ||
| Geographical Limits: | Duddon Valley from Seathwaite [SD 220 960] to Bleansley Bank [SD 200 890], Cumbria. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Ulpha Formation [Obsolete Name and Code: Use ULP]
(-3743)
Ulpha Andesites [Obsolete Name and Code: Use ULP] (-1892) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Fellside southeast of Ulpha, Cumbria. | ||
| 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. | |||
| Mitchell, G H, 1956. (Undivided Lickle Rhyolites). The Borrowdale Volcanic Series of the Dunnerdale Fells, Lancashire. Liverpool and Manchester Geological Journal, Vol.1, p.428-449. | |||
| 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 | |||