The BGS Lexicon of Named Rock Units — Result Details

Wet Side Edge Tuff Member

Computer Code: WSE Preferred Map Code: WSE
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Brown-weathered, massive, eutaxitic andesitic lapilli-tuff.
Definition of Lower Boundary: Base of andesitic lapilli-tuff. Markedly unconformable on the succession of basaltic to dacitic lavas in the Birker Fell Andesite Formation.
Definition of Upper Boundary: At base of overlying unnamed bedded tuff, member of the Whorneyside Tuff Formation.
Thickness: 0 - 290m
Geographical Limits: Watendlath, Borrowdale, to Scafell, Langdale, Wet Side Edge - Duddon Valley - Stainton Pike, Cumbria.
Parent Unit: Whorneyside Tuff Formation (WNY)
Previous Name(s): Wet Side Edge Formation (-2539)
Wet Side Edge Member (-4982)
Whorneyside Ignimbrite (-4983)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Wet Side Edge. 
Reference(s):
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, p.886-897. 
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 E029