The BGS Lexicon of Named Rock Units — Result Details

Stoneside Hill Formation [Obsolete: use BFA]

Stratotypes:
Computer Code:	STHI	Preferred Map Code:	StHi
Status Code:	Full
Age range:	Abereiddian Stage (O2) — Caradoc Series (O4)
Lithological Description:	[Obsolete: use BFA] 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:	none recorded or not applicable
Previous Name(s):	Stoneside Hill Tuffs and Lavas (Part) [Obsolete Name and Code: Use STHI] (-4904) Nettle Crags Tuff and Lavas (part) [Obsolete Name and Code: Use STHI] (-1204)
Alternative Name(s):	none recorded or not applicable
Type Area	On Bootle Fell and in Crockley Beck, between Nettle Crags and Stoneside Hill.
Reference(s):
British Geological Survey. 1994. Black Combe and Bootle, SD18NW, Solid and Drift 1:10 000. (Keyworth, Nottingham: British Geological Survey.)
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.
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 Unpublished Ph.D. thesis, University of Sheffield.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

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