The BGS Lexicon of Named Rock Units — Result Details

Little Stand Tuff Member

Computer Code: LIT Preferred Map Code: LiT
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: White-weatherd, massive, crystal-rich (K-feldspar), welded rhyolitic tuff containing lithophysae-rich zones locally.
Definition of Lower Boundary: Base of tuff; overlies volcaniclastic sandstones and andesite sheets of the Birker Fell Andesite Formation (undivided).
Definition of Upper Boundary: Top of tuff; overlain by volcaniclastic sandstones of the Blisco Member or by the Great Whinscale Dacite.
Thickness: 7 - 27m; ponded at one locality to 60m
Geographical Limits: West of Yoadcastle (SD 15 95) south of Devoke Water to Pike of Blisco (NY 27 04) and Seathwaite Tarn (SD 249 984), Cumbria.
Parent Unit: Birker Fell Andesite Formation (BFA)
Previous Name(s): Tongue House Member [Obsolete Name: Replaced By LIT, GWD, GY] (TNM)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Crags around Little Stand. 
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. 
Petterson, M G, Beddoe-Stephens, B, Millward, D and Johnson, E W, 1992. A pre-caldera plateau-andesite field in the Borrowdale Volcanic Group of the English Lake District. Journal of the Geological Society, London, Vol. 149, 889-906. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038