The BGS Lexicon of Named Rock Units — Result Details

Cautley Volcanic Member

Computer Code: CTV Preferred Map Code: CtV
Status Code: Full
Age range: Rawtheyan Stage (OW) — Rawtheyan Stage (OW)
Lithological Description: Silicic tuffs, buff to pink in colour; thickly bedded at base becoming finer grained and thinly bedded at top
Definition of Lower Boundary: Taken at the base of the lowest bed of volcaniclastic rock overlying grey flaggy mudstone of the main part of the Cautley Mudstone Formation.
Definition of Upper Boundary: Passes up into grey splintery mudstone of the Cautley Mudstone Formation.
Thickness: Up to 24m
Geographical Limits: Restricted to the Cautley and Dent districts of Cumbria
Parent Unit: Cautley Mudstone Formation (CMU)
Previous Name(s): Cautley Volcanic Formation [Obsolete Name and Code: Use CTV] (-4574)
Cautley Volcanic Group [Obsolete Name and Code: Use CTV] (-828)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Wandale Beck (Murthwaite Inlier) and its tributaries on the western bank between the Odd Gill and the confluence with the River Rawthey, Cumbria. Ingham, 1966. 
Reference Section  Backside Beck, Westerdale Inlier, Cumbria. Ingham, 1966. 
Reference(s):
Owen, A W and Rushton, A W A, 1999. Arenig to Ashgill of northern England. pp 259-292 in Rushton, A W A, Owen, A W, Owens, R M, and Prigmore, J K. British Cambrian to Ordovician stratigraphy. Geological Conservation Review, Vol. 18. Joint Nature Conservation Committee. Peterborough. 
Ingham, J K, 1966. The Ordovician rocks in the Cautley and Dent districts of Westmorland and Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.35, 455-505. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E040