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
Stratotypes:
Type Area  Summit area of Knott Hill, above 200m contour. 900m north west of Broadgate, near Hallthwaites, Cumbria. 
Reference(s):
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:
E048