| Computer Code: |
KHSAM |
Preferred Map Code: |
KHSa' |
| Status Code: |
Full |
| Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
| Lithological Description: |
[Obsolete: use KHSA]
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: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Summit area of Knott Hill, above the 200 m contour. 900 m north west of Broadgate, near Hallwaites, Cumbria. Johnson, Soper and Burgess, 2001. |
| 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
|
