| Computer Code: |
NORB |
Preferred Map Code: |
NrF |
| Status Code: |
Full |
| Age range: |
Cautleyan Stage (OU)
— Rawtheyan Stage (OW) |
| Lithological Description: |
Calcareous siltstones and argillaceous limestones with a shelly fauna. There is a siliceous conglomerate at the base. |
| Definition of Lower Boundary: |
Taken at the irregular base of the conglomerate in Douk Ghyll, Horton, unconformably overlying sandstones of the Ingleton Group. Elsewhere, the base of the formation is not seen. |
| Definition of Upper Boundary: |
Defined by the base of the overlying Sowerthwaite Formation. |
| Thickness: |
Up to 160m |
| Geographical Limits: |
Restricted to the Craven inliers, North Yorkshire |
| Parent Unit: |
Dent Group (DNT)
|
| Previous Name(s): |
Douk Ghyll Beds [Obsolete Name and Code: Use NORB]
(DOU)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Between Norber Brow and Wharfe Gill, about 1 km northeast of Austwick. Arthurton et al., 1988. |
| Reference Section |
Douk Ghyll, Horton in Ribblesdale Arthurton et al., 1988. |
| Reference(s): |
| 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). |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| Millward, D, and Stone, P. 2012. Stratigraphical framework for the Ordovician and Silurian sedimentary strata of northern England and the Isle of Man. British Geological Survey Research Report, RR/12/04. 119pp. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E050
E060
|
