The BGS Lexicon of Named Rock Units — Result Details
Clarborough Member
| Computer Code: | CLB | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Ladinian Age (TD) — Ladinian Age (TD) | ||
| Lithological Description: | Mudstone, silty, reddish brown with common veins of satin spar gypsum and indurated beds of reddish brown or greenish grey siltstone and very fine-grained sandstone, dolomitic. | ||
| Definition of Lower Boundary: | Conformable, at gradational upward passage from reddish-brown mudstone of the underlying Sidmouth Mudstone Formation (undivided) to the more strongly indurated, silty gypsiferous mudstone of the Clarborough Member. | ||
| Definition of Upper Boundary: | Conformable, at gradational upward passage from the more strongly indurated, silty gypsiferous mudstone of the Clarborough Member to the reddish-brown mudstone of the overlying Sidmouth Mudstone Formation (undivided) | ||
| Thickness: | 3 to 12 m. | ||
| Geographical Limits: | Surface outcrop limited to north Nottinghamshire, East Retford area. | ||
| Parent Unit: | Sidmouth Mudstone Formation (SIM) | ||
| Previous Name(s): | Clarborough Formation [Obsolete Name and Code: Use CLB]
(-3305)
Clarborough Beds [Obsolete Name and Code: Use CLB] (-1438) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Disused gypsum pit at Clarborough, Nottinghamshire. Smith et al., 1973. | ||
| Reference(s): | |||
| 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. | |||
| Smith, E G, Rhys, G H and Goossens, R F. 1973. Geology of the country around East Retford. Memoir of the Geological Survey of Great Britain, Sheet 101 (England and Wales). | |||
| Smith, E G and Warrington, G. 1971. The age and relationships of the Triassic rocks assigned to the lower part of the Keuper in north Nottinghamshire, north-west Lincolnshire and south Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.38, 201-227. | |||
| 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: | |||
| none recorded or not applicable | |||