The BGS Lexicon of Named Rock Units — Result Details

Bannisdale Formation

Computer Code: BND Preferred Map Code: BND
Status Code: Full
Age range: Gorstian Age (SG) — Ludfordian Age (SD)
Lithological Description: Silty mudstone with subordinate siltstone and sandstone.
Definition of Lower Boundary: Conformably overlies the Coniston Group (Yewbank Formation).
Definition of Upper Boundary: Conformably overlain by the Underbarrow Formation.
Thickness: c.3000m
Geographical Limits: Southern Lake District and Northwest Pennines.
Parent Unit: Kendal Group (KNDL)
Previous Name(s): Bannisdale Slates [Obsolete Name And Code: Use BND] (BASL)
Alternative Name(s): none recorded or not applicable
Reference Section  East of Borwick Fold to Land's Lot. 
Type Area  Reston Scar. 
Marr J E. 1892. On the Wenlock and Ludlow strata of the Lake District. Geological Magazine, Vol. 9, p 534-541. 
Kneller, B C. 1990. The Wenlock rocks of sheet 38 (Ambleside). British Geological Survey Technical Report, WA/90/64 
Lawrence, D J D, Webb, B C, Young, B and White, D E. 1986. The geology of the Late Ordovician and Silurian rocks (Windermere Group) in the area around Kentmere and Crook. Includes map, 1:25,000 series, Parts of Sheets NY40 and SD49 Kentmere and Crook, Solid and Drift Geology. Report of the British Geological Survey, 18/5. 
Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E039 E038 E040 E048