The BGS Lexicon of Named Rock Units — Result Details

Jop Ridding Sandstone Member

Computer Code: JRSA Preferred Map Code: JRS
Status Code: Full
Age range: Rawtheyan Stage (OW) — Rawtheyan Stage (OW)
Lithological Description: Unbedded greenish or purplish grey, medium-grained tuffaceous sandstone.
Definition of Lower Boundary: Taken at the base of the tuffaceous sandstone, unconformably overlying the siltstone and limestone sequence of the Norber Formation.
Definition of Upper Boundary: Taken at the base of the overlying siltstone and mudstone of the main part of the Sowerthwaite Formation.
Thickness: 40-250m
Geographical Limits: Restricted to the Craven Inliers, North Yorkshire.
Parent Unit: Sowerthwaite Formation (SOW)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Jop Ridding Farm, about 1km northeast of Austwick 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). 
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:
E060