The BGS Lexicon of Named Rock Units — Result Details

Lingmell Tuff Formation

Computer Code: LME Preferred Map Code: Lme
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Pale-weathered, stratified sequence of garnetiferous silicic tuff, lapilli-tuff and pyroclastic breccia with intercalated volcaniclastic sedimentary rocks. Includes dacite (Scafell Dacite) and rhyolite (Rosthwaite) lavas.
Definition of Lower Boundary: Base of diverse sequence of tufflapilli-tuff that usually unconformably overlies the Crinkle Tuff Member (high-grade rhyolitic tuff) in the Airy's Bridge Tuff Formation.
Definition of Upper Boundary: Defined by unconformable base of overlying Seathwaite Fell Sandstone Formation (volcaniclastic sandstone).
Thickness: 0 to 450m
Geographical Limits: Lingmell - Scafell - Longdale; Great Gable - Borrowdale - Rosthwaite; Yewbarrow - Illgill Head, Cumbria.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): Lingmell Formation (-2908)
Napes Needle Member [Obsolete Name: Part Of LME] (NPN)
Alternative Name(s): none recorded or not applicable
Type Area  Lingmell (NY 20 08) - Scafell (NY 20 06) - Great Gable (NY 21 10). 
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. 
Kneller, B C, Kokelaar, B P and Davis, N C, 1993. The Lingmell Formation. British Geological Survey Technical Report, WA/93/43. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038 E029