| 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 Name and Code: 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): |
| 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. 1994a. 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: |
|
E048
|
