The BGS Lexicon of Named Rock Units — Result Details

Surgill Shale

Computer Code: SLSH Preferred Map Code: SlSh
Status Code: Full
Age range: Pendleian Substage (CE) — Pendleian Substage (CE)
Lithological Description: Grey, shaly, commonly sandy, finely micaceous siltstones and mudstones with thin subordinate sharp-soled sandstones.
Definition of Lower Boundary: Top of highest mappable thick coarse-grained sandstone of Pendle Grit, or top of unit containing thick massive coarse-grained sandstones where individual sandstones not mapped.
Definition of Upper Boundary: Overlain by sharp base of Grassington Grit, Brennand Grit or Warley Wise Grit; commonly an unconformity.
Thickness: To 245m. Commonly absent.
Geographical Limits: Craven Basin, northwest England.
Parent Unit: Pendle Grit Member (PG)
Previous Name(s): Pendle Shale Formation (-3036)
Surgill Shale Member (-3037)
Surgill Shales (-2429)
Alternative Name(s): none recorded or not applicable
Reference Section  Folds Clough and northerly tributary gulley, Brennand Fell. 
Type Area  Lothersdale. 
Reference Section  Surgill Beck, Lothersdale area 
Bray, A. 1927. The Carboniferous sequence between Lothersdale and Cowling (Colne). Journal of the Manchester Geological Association, Vol.1, 44-57. 
Sims, A P. 1988. The evolution of a sand-rich basin-fill sequence in the Pendleian (Namurian, E1c) of north-west England. Unpublished PhD thesis, University of Leeds, Department of Earth Sciences. 
Baines, J F, Not published. The stratigraphy and sedimentology of the Skipton Moor Grits (Namurian (E1c) and their lateral equivalents. Ph.D. thesis, University of Keele, 1977. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: