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)
Alternative Name(s): none recorded or not applicable
Type Section  Cropwell Bridge Borehole (SK63NE/28), Cropwell Bishop, Notts.; depth range 80.4m-84.9m. Curated core held at BGS Keyworth. 
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). 
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:
E141 E126 E142