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
Stratotypes:
Reference Section  Surgill Beck, Lothersdale area 
Type Area  Lothersdale. 
Reference Section  Folds Clough and northerly tributary gulley, Brennand Fell. 
Reference(s):
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 Unpublished PhD thesis, University of Leeds, Department of Earth Sciences.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:
E059