| Computer Code: |
SDS |
Preferred Map Code: |
SdS |
| Status Code: |
Full |
| Age range: |
Gorstian Age (SG)
— Gorstian Age (SG) |
| Lithological Description: |
Poorly sorted arkosic fine-grained sandstone, mostly thickly bedded. |
| Definition of Lower Boundary: |
Taken at the sharp base of thick-bedded sandstone within the sequence of laminated sandy siltstones of the Horton Formation. |
| Definition of Upper Boundary: |
Defined by the change to dominantly laminated siltstones within the main part of the Horton Formation. |
| Thickness: |
40-80m |
| Geographical Limits: |
Restricted to the Craven Inliers, North Yorkshire. |
| Parent Unit: |
Horton Siltstone Formation (HNF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Tongue Gill on the southern limit of the Studrigg-Studfold Syncline Arthurton et al, 1988 |
| Reference(s): |
| Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. |
| King, W B R and Wilcockson, W H, 1934. The Lower Palaeozoic rocks of Austwick and Horton-in-Ribblesdale, Yorkshire. Quarterly Journal of the Geological Society of London, Vol.90, 7-31. |
| Arthurton, R S, Johnson, E W, and Mundy, D J C. 1988. Geology of the country around Settle. Memoir of the British Geological Survey, Sheet 60 (England and Wales). |
| McCabe, P J. 1972. The Wenlock and Lower Ludlow strata of the Austwick and Horton-in-Ribblesdale Inlier of north west Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.39, 167-174. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E060
|
