The BGS Lexicon of Named Rock Units — Result Details

Knott Hill Formation (Metasomatically Altered) [Obsolete Usage: Use KHSA]

Computer Code: KHSAM Preferred Map Code: KHSa'
Status Code: Index Level
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: Thin-bedded and laminated sandstone, interpreted as distal turbidites.
Definition of Lower Boundary: A gradational transition from undivisional Skiddaw Group silty mudstone, over 10 - 20m through laminated sandy siltstone into sandstone.
Definition of Upper Boundary: The top is unconformable with the overlying Borrowdale Volcanic Group.
Thickness: About 250 m (+/-50m) thick.
Geographical Limits: Within 1 km of the summit of Knott Hill.
Parent Unit: Skiddaw Group (SKG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Summit area of Knott Hill, above the 200 m contour. 900 m north west of Broadgate, near Hallwaites, Cumbria. Johnson, Soper & Burgess, 2001. 
British Geological Survey, 1994(a). Duddon Bridge and Hallthwaites, SD18NE, 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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: