The BGS Lexicon of Named Rock Units — Result Details

Sneinton Formation [Obsolete Name And Code: Use TPSF]

Computer Code: SNT Preferred Map Code: Snt
Status Code: Index Level
Age range: Anisian Age (TA) — Anisian Age (TA)
Lithological Description: Mudstone and siltstone, reddish brown, interbedded with buff-grey, fine- to medium-grained sandstone, micaceous, pebbly beds in lower half.
Definition of Lower Boundary: Sharp; at transition from sandstone at top of Nottingham Castle Sandstone Formation to mudstone dominated lithologies; boundary marked locally by conglomerate up to 1m thick.
Definition of Upper Boundary: Gradational; taken at top of highest significant sandstone bed within gradual upward passage into thinly laminated beds of the Radcliffe Formation.
Thickness: 30-85m (in south Nottinghamshire and Lincolnshire), 43m in Cropwell Bridge borehole (SK63NE/28).
Geographical Limits: Mappable at surface in East Midlands. Passes into mudstone northwards into south Yorkshire. Passes westwards in central England and Cheshire Basin into Bromsgrove Sandstone, Tarporley Siltstone and equivalents.
Parent Unit: Mercia Mudstone Group (MMG)
Previous Name(s): Woodthorpe Formation [Obsolete Name And Code: Part Of SNT] (WTF)
Woodthorpe Formation + Waterstones Formation (-4890)
Woodthorpe Formation + Colwick Formation (-1192)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Surface section, former railway cutting, Colwick Road, Sneinton, Nottingham. Exposes lower boundary and lowermost 20m of formation. 
Type Section  Cropwell Bridge Borehole (SK63NE/28), Cropwell Bishop, Notts.: depth range 170.7m-214.3m. Curated core held at BGS, Keyworth. 
Type Area  Sheet 126, Nottingham. 
Reference Section  Fulbeck 1 borehole (SK85SE/25), Fulbeck, Lincs.: depth range 301.6m-375.2m. Curated core held at BGS, Keyworth. 
Reference(s):
Elliott, R E 1961. The stratigraphy of the Keuper Series in southern Notinghamshire. Proceedings of the Yorkshire Geological Society, Vol.33, 197-231. 
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. 
Charsley, T J. 1989. Geology of the Nottingham (south) district: 1:10,000 Sheet SK63NE and part of 1:50,000 Sheet 126 (Nottingham) and Sheet 142 (Melton Mowbray). British Geological Survey Technical Report, Onshore Geology Series, 89/4. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E126 E127 E142 E141