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
Alternative Name(s): none recorded or not applicable
Type Area  Sheet 38, Ambleside, near Appletreeworth 
Kneller, B C and others. 1994. Lithostratigraphy of the Windermere supergroup, northern England. Geological Journal 29 (3), p. 219 - 239. 
Millward D, et al. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, Sheet 38 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: