The BGS Lexicon of Named Rock Units — Result Details
Sneinton Formation [Obsolete: use TPSF]
| Computer Code: | SNT | Preferred Map Code: | Snt |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Anisian Age (TA) — Anisian Age (TA) | ||
| Lithological Description: | [Obsolete: use TPSF] 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: | none recorded or not applicable | ||
| Previous Name(s): | Woodthorpe Formation plus Waterstones Formation [Obsolete Name and Code: Use SNT]
(-4890)
Woodthorpe Formation plus Colwick Formation [Obsolete Name and Code: Use SNT] (-1192) Woodthorpe Member (WTF) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Sheet 126, Nottingham. | ||
| 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. | ||
| Reference Section | Fulbeck 1 borehole (SK85SE/25), Fulbeck, Lincs.: depth range 301.6m-375.2m. 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. | |||
| 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 | |||