The BGS Lexicon of Named Rock Units — Result Details

Yewbank Formation

Computer Code: YBK Preferred Map Code: YBK
Status Code: Full
Age range: Gorstian Age (SG) — Gorstian Age (SG)
Lithological Description: Sandstone.
Definition of Lower Boundary: Conformably overlies the Moorhowe Formation of the Coniston Group.
Definition of Upper Boundary: Conformably overlain by the Bannisdale Formation.
Thickness: c.750m
Geographical Limits: Southern Lake District and northwest Pennines.
Parent Unit: Coniston Group (CTG)
Previous Name(s): Yewbank Sandstone (In Part) (-4987)
Yewbank Member (-4410)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Southwest slopes of Yewbank. 
Reference(s):
Marr J E. 1892. On the Wenlock and Ludlow strata of the Lake District. Geological Magazine, Vol. 9, p 534-541. 
Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. 
Kneller, B C. 1990. The Wenlock rocks of sheet 38 (Ambleside). British Geological Survey Technical Report, WA/90/64 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038 E048