The BGS Lexicon of Named Rock Units — Result Details

Skelgill Formation

Computer Code: SKB Preferred Map Code: SKB
Status Code: Full
Age range: Rhuddanian Age (SR) — Aeronian Age (SA)
Lithological Description: Laminated mudstone with calcareous laminae. Thin, impure limestone at base.
Definition of Lower Boundary: Unconformably overlies the Red Gill Formation of the Dent Group.
Definition of Upper Boundary: Conformably overlain by the Browgill Formation.
Thickness: 20m+
Geographical Limits: Southern Lake District and northwest Pennines.
Parent Unit: Stockdale Group (STK)
Previous Name(s): Graptiliferous Mudstones (-1184)
Skelgill Member (-4885)
Skelgill Beds (-1823)
Skelgill Shales [Obsolete Name And Code: Use SKB] (SGSH)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Holbeck Gill, upstream from High Skelgill Farm. 
Reference(s):
Marr, J E and Nicholson, H A, 1888. The Stockdale Shales. Quarterly Journal of the Geological Society of London, Vol.44, p.654-732. 
Harkness, R and Nicholson, H A, 1877. On the strata and their fossil contents between the Borrowdale Series of the north of England and the Coniston Flags. Quarterly Journal of the Geological Society of London, Vol.33, p.461-484. 
Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. 
Hutt, J E, 1974. The Llandovery graptolites of the English Lake District Pt.1. Palaeontographical Society Monograph No.540, p.1-56. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038 E039 E031