The BGS Lexicon of Named Rock Units — Result Details

Stoneside Hill Formation [Obsolete Name: Part Of BFA]

Computer Code: STHI Preferred Map Code: StHi
Status Code: Index Level
Age range: Abereiddian Stage (O2) — Caradoc Series (O4)
Lithological Description: Dacite lavas and possible sills with intercalated volcanogenic sandstone, dacitic tuff and basaltic andesite sills.
Definition of Lower Boundary: Non-sequence at top of Nettle Crags Tuff Formation.
Definition of Upper Boundary: Presumed to be non-sequence at top of dacite succession in faulted, and covered by superficial deposits. Overlying strata belong to the Waberthwaite Formation.
Thickness: At least 700m, top not seen
Geographical Limits: Bootle Fell - Thwaites Fell area, between the Skiddaw Group and the Eskdale Granodiorite.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): Stoneside Hill Tuffs And Lavas (Part) (-4904)
Nettle Crags Tuff And Lavas (Part) (-1204)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  On Bootle Fell and in Crockley Beck, between Nettle Crags and Stoneside Hill. 
Reference(s):
Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. 
British Geological Survey, 1994. Black Combe and Bootle, SD18NW, Solid and Drift 1:10,000 (Keyworth, Nottingham, British Geological Survey). 
Mathieson, N A, 1986 Geology, structure and geochemistry of the Ordovician volcanic succession in south west Cumbria. Unpublished Ph.D. thesis, University of Sheffield. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable