The BGS Lexicon of Named Rock Units — Result Details

Appletreeworth Volcanic Formation

Computer Code: AVF Preferred Map Code: AVF
Status Code: Full
Age range: Ashgill Series (OA) — Ashgill Series (OA)
Lithological Description: Rhyolitic tuff within a succession of calcareous siltstones and impure limestones.
Definition of Lower Boundary: Base of rhyolitic tuff, overlying limestone of the Broughton Moor Formation or, where absent, the Kirkley Bank Formation.
Definition of Upper Boundary: Defined by base of overlying calcareous siltstones/impure limestones.
Thickness: 0 to 5m
Geographical Limits: Windermere to Broughton Mills, Cumbria.
Parent Unit: Dent Group (DNT)
Previous Name(s): Rhyolitic Ash (-1961)
Alternative Name(s): none recorded or not applicable
Type Area  Sheet 38, Ambleside, near Appletreeworth 
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. 
Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: