The BGS Lexicon of Named Rock Units — Result Details

Blisco Sandstone Member

Computer Code: BCO Preferred Map Code: Bco
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Andesitic volcaniclastic sandstone with tuff and lapilli-tuff interbeds; bedded succession.
Definition of Lower Boundary: Overlies Little Stand Tuff; base taken at change from massive rhyolitic tuff to bedded andesitic volcanclastic sandstone.
Definition of Upper Boundary: Overlain by unnamed dacite within the Birker Fell Andesite Formation.
Thickness: 0 - 150m
Geographical Limits: Pike of Blisco to Little Stand between Duddon Valley and Longdale, Cumbria.
Parent Unit: Birker Fell Andesite Formation (BFA)
Previous Name(s): Blisco Formation [Obsolete Name and Code: Use BCO] (-2587)
Blisco Member [Obsolete Name and Code: Use BCO] (-3198)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Pike of Blisco. 
Reference(s):
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. 
Branney, M J and Soper, N J, 1988. Ordovician Volcano-tectonics in the English Lake District. Journal of the Geological Society of London, Vol.145, p.367-376. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038