The BGS Lexicon of Named Rock Units — Result Details

Frith Crag Breccia Member

Stratotypes:
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 160 m.
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 [Obsolete Name and Code: Use FRCR] (-1547) Frith Crag Member [Obsolete Name and Code: Use FRCR] (-4657)
Alternative Name(s):	none recorded or not applicable
Type Area	Swindale Foot Crag, in Swindale, about 4km westsouthwest of Shap, Cumbria Millward 2002
Reference(s):
Nutt, M J C, 1970. The Borrowdale Volcanic Series and associated rocks around Haweswater, Westmorland. Unpublished PhD thesis, University of London (Queen Mary College).
Millward, D. 2002. Geology of the area between Haweswater and Shap. British Geological Survey Research Report RR/02/02.
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030