The BGS Lexicon of Named Rock Units — Result Details

Lanty Crag Breccia Member

Computer Code: LTY Preferred Map Code: Lty
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: A heterogeneous succession of volcaniclastic breccia and conglomerate, with some bedded volcaniclastic sandstone.
Definition of Lower Boundary: Taken at the abrupt change from mudstone of the Skiddaw Group to volcaniclastic rocks. The Member lies at the base of both the Birker Fell Andesite Formation and the Borrowdale Volcanic Group in the area.
Definition of Upper Boundary: Overlain by aphyric andesite within the Birker Fell Andesite Formation.
Thickness: 0 - 105m
Geographical Limits: From Barton Fell, Ullswater, to Bampton, north-eastern Lake District, Cumbria.. Also present in the Tarn Moor Tunnel [Wadge et al., 1972].
Parent Unit: Birker Fell Andesite Formation (BFA)
Previous Name(s): Bampton Conglomerate (-3542)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Lanty Crag, 2km SSW of Helton, Cumbria. Beddoe-Stephens, 2000. 
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 Unpublished PhD thesis, University of London (Queen Mary College). 
Beddoe-Stephens, B, 2000. The Borrowdale Volcanic Group between Haweswater and eastern Ullswater. British Geological Survey Technical Report WG/00/04. 
Wadge, A J, Nutt, M J C and Skevington, D, 1972. Geology of the Tarn Moor Tunnel in the Lake District. Bulletin of the Geological Survey of Great Britain, No. 41, 55 - 73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E030 E039