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 Andesites (-1892)
Ulpha Formation (-3743)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Fellside southeast of Ulpha, Cumbria. 
Reference(s):
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038 E048