The BGS Lexicon of Named Rock Units — Result Details

Knott Hill Formation

Computer Code: KHSA Preferred Map Code: KHS
Status Code: Full
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: Sandstone, thin-bedded and laminated distal turbidites.
Definition of Lower Boundary: Gradational - transition from undivided Skiddaw Group silty mudstone over 10-20m through laminated sandy siltstone into sandstone.
Definition of Upper Boundary: Unknown. Top not seen, younger part of formation eroded or faulted out.
Thickness: c.250m (+/- 50m)
Geographical Limits: Within 1km of summit of Knott Hill.
Parent Unit: Skiddaw Group (SKG)
Previous Name(s): Knott Hill Formation (Metasomatically Altered) [Obsolete Usage: Use KHSA] (KHSAM)
Alternative Name(s): none recorded or not applicable
Type Area  Summit area of Knott Hill, above 200m contour. 900m north west of Broadgate, near Hallthwaites, Cumbria. 
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(a). Duddon Bridge and Hallthwaites, SD18NE, Solid and Drift 1:10,000. (Keyworth, Nottingham, British Geological Survey). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: