The BGS Lexicon of Named Rock Units — Result Details

Scafell Dacite Member

Computer Code: SCD Preferred Map Code: ScD
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Pale-weathered dacite, locally flow-banded and folded, with garnet phenocrysts; marginal autobreccia.
Definition of Lower Boundary: Base of dacite; unconformable - overlies older parts of the Lingmell Tuff Formation, and locally rests on the Airy's Bridge Tuff Formation (rhyolitic tuffs).
Definition of Upper Boundary: Overlain by the Seathwaite Fell Sandstone Formation (volcaniclastic sandstone and breccia).
Thickness: 0 - 425m
Geographical Limits: Between Little Narrowcove (NY 2250 0675) and Aaron Crags (NY 2293 1038), Cumbria.
Parent Unit: Lingmell Tuff Formation (LME)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Little Narrowcove to Aaron Crags (NY 2293 1038); Criscliffe Knotts maximum thickness. 
Reference(s):
Kneller, B C, Kokelaar, B P and Davis, N C, 1993. The Lingmell Formation. British Geological Survey Technical Report, WA/93/43. 
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