The BGS Lexicon of Named Rock Units — Result Details

Frith Crag Breccia Member

Computer Code: FRCR Preferred Map Code: FrCr
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Massive tuff-breccia, matrix- to clast-supported
Definition of Lower Boundary: Taken at the base of the unit of tuff-breecia overlying andesite within the Birker Fell Andesite Formation
Definition of Upper Boundary: Defined by the base of the overlying andesites of the Birker Fell Andesite Formation
Thickness: Up to 160m
Geographical Limits: Restricted to the area between Haweswater and Ralfland Forest, northeastern Lake District, Cumbria
Parent Unit: Birker Fell Andesite Formation (BFA)
Previous Name(s): Frith Crag Tuffs (-1547)
Frith Crag Member (-4657)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Swindale Foot Crag, in Swindale, about 4km westsouthwest of Shap, Cumbria Millward 2002 
Reference(s):
Millward, D, 2002. Geology of the area between Haweswater and Shap. British Geological Survey Research Report RR/02/02 
Nutt, M J C, 1970. The Borrowdale Volcanic Series and associated rocks around Haweswater, Westmorland. Unpublished PhD thesis, University of London (Queen Mary College). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030