The BGS Lexicon of Named Rock Units — Result Details

Cotgrave Sandstone Member

Computer Code: COT Preferred Map Code: Cot
Status Code: Full
Age range: Carnian Age (TC) — Carnian Age (TC)
Lithological Description: Sandstone, fine- to medium-grained dolomitic, pale greenish grey, interbedded with mudstone and siltstone, dark greenish-grey. Common gypsum nodules.
Definition of Lower Boundary: Conformable, at the abrupt base of the lowest pale grey sandstone bed of the Cotgrave Sandstone Member where it overlies the red-brown mudstone of the underlying Gunthorpe Member.
Definition of Upper Boundary: Conformable, at the abrupt or rapid upward transition from interbedded green mudstone and pale grey fine-grained sandstone of the Cotgrave Sandstone Member to reddish brown structureless mudstone at the base of the Edwalton Member.
Thickness: 1 to 5m (4.5m in Cropwell Bridge Borehole, SK63NE/28).
Geographical Limits: Mappable at surface in south Nottinghamshire and Leicestershire; not traced north of Newark.
Parent Unit: Sidmouth Mudstone Formation (SIM)
Previous Name(s): Cotgrave Skerry Member (-1454)
Cotgrave Skerry (-1453)
Cotgrave Skerry (Member) (-2716)
Cotgrave Place Skerry (-4566)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Fulbeck 1 Borehole (SK85SE/25), Fulbeck, Lincs.; depth range 199.4m-200.1m. Curated core held at BGS Keyworth. 
Reference Section  Surface section, in north bank of gullied trackway to west of Kneeton, Notts. Exposes entire thickness (2.7m). 
Type Section  Cropwell Bridge Borehole (SK63NE/28), Cropwell Bishop, Notts.; depth range 80.4m-84.9m. Curated core held at BGS Keyworth. 
Reference(s):
Charsley, T J, Rathbone, P A and Lowe, D J, 1990. Nottingham: A geological background for planning and development. British Geological Survey Technical Report WA/90/1. 
Elliott, R E 1961. The stratigraphy of the Keuper Series in southern Notinghamshire. Proceedings of the Yorkshire Geological Society, Vol.33, 197-231. 
Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. 
Howard, A S, Warrington, G, Ambrose, K, and Rees, J G. 2008. A formational framework for the Mercia Mudstone Group (Triassic) of England and Wales. British Geological Survey Research Report, RR/08/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E126 E142 E141