The BGS Lexicon of Named Rock Units — Result Details
Cropwell Bishop Formation [Obsolete: use BCMU]
| Computer Code: | CBP | Preferred Map Code: | CBp |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Norian Age (TN) — Rhaetian Age (TR) | ||
| Lithological Description: | [Obsolete: use BCMU] Mudstone and siltstone, reddish brown, blocky; common veins, nodules and beds of gypsum; a few beds of dolomitic sandstone. | ||
| Definition of Lower Boundary: | Gradational; taken at top of highest significant sandstone bed of the underlying Hollygate Sandstone Member (Edwalton Formation). | ||
| Definition of Upper Boundary: | Sharp, apparantly conformable, marked by colour change into grey-green siltstones of the Blue Anchor Formation. | ||
| Thickness: | 30 to 45m (38m in Fulbeck 1 Borehole, SK85SE/25). | ||
| Geographical Limits: | Mapped at surface in Nottinghamshire and Leicestershire. Recognisable in subsurface throughout East Midlands and NE England; passes laterally into thicker equivalents in central Midlands and Cheshire Basin. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Trent Formation [Obsolete Name and Code: Use CBP]
(TNT)
Glen Parva Formation [Obsolete Name and Code: Use CBP] (GPV) Trent Formation plus Glen Parva Formation [Obsolete Name and Code: Use CBP] (-2672) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Fulbeck 1 Borehole (SK85SE/25), Fulbeck, Lincs.; depth range 117.5m-156.1m; curated core held at BGS Keyworth. | ||
| Reference Section | Bantycock Gypsum Quarry, 4km SSE of Newark, Notts. Exposes upper 25m of formation with upper boundary. | ||
| Type Section | Composite stratotype, providing complete section: Cropwell Bishop Gypsum Quarry, Cropwell Bishop, Nottinghamshire and nearby Cropwell Bridge Borehole (SK63NE/28); depth range 0-35.8m; curated core held at BGS Keyworth. | ||
| Reference(s): | |||
| 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. | |||
| Lowe, D J, 1989. Geology of the Cropwell Butler district. 1:10,000 Sheet SK63NE: Part of 1:50,000 Sheet 126, Nottingham and Sheet 142, Melton Mowbray. British Geological Survey, Onshore Geology Series Technical Report 89/10. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E126 E127 E142 E141 | |||