The BGS Lexicon of Named Rock Units — Result Details
Roade Member
| Computer Code: | ROAD | Preferred Map Code: | BwL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Bathonian Age (JN) — Bathonian Age (JN) | ||
| Lithological Description: | A pale grey to off-white or brownish, more or less clayey or sandy shell fragmental, bioturbated wackestone and packstone, characteristically containing Kallirhynchia sharpi (Muir-Wood) and other brachiopods and bivalves such as mussels and oysters with thin marls and mudstones. | ||
| Definition of Lower Boundary: | The base of the described limestones, overlying mudstones of the Rutland Formation. | ||
| Definition of Upper Boundary: | Generally a sharp boundary with beds of limestone, marl or mudstone lacking K sharpi,commonly a marl or mudstone bed at this level which may prove a reliable marker compared to the mudstone at the base of the Ardley Member of the White Limestone in Oxon. | ||
| Thickness: | Typically about 1m thick in the type area, elsewhere from about 3m, foe example the 2.51 m recorded by Torrens, 1967, to 2.99 m measured by Cripps,1986, at the type section. | ||
| Geographical Limits: | From the Towcester district, Northants (Sheet 202) to the Stamford district (Cripps,1986) passing south- west into the Shipton Member of the White Limestone Formation and north into the Blisworth Limestone Formation which cannot be separated from the Longthorpe Member, notwithstanding the presence of K sharpi in the lower part of the Blisworth Limestone Formation in north Lincolnshire (see Cripps,1986). | ||
| Parent Unit: | Blisworth Limestone Formation (BWL) | ||
| Previous Name(s): | Kallirhyncia Sharpi Beds [Obsolete Name and Code: Use ROAD]
(-1143)
Sharpi Beds [Obsolete Name and Code: Use ROAD] (-1791) Rhynconella Zone [Obsolete Name and Code: Use ROAD] (-3004) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Cranford St John Quarry. Torrens, 1967; Cox, B M, and Sumbler, M G. 2002. | ||
| Type Section | Roade Railway Cutting, near Blisworth. Thompson, 1924; Torrens,1967; Cox, B M, and Sumbler, M G. 2002. | ||
| Reference(s): | |||
| Torrens, H S, 1967. The Great Oolite Limestone of the Midlands. Transactions of the Leicestershire Literary and Philosophical Society, Vol.61, 65-90. | |||
| Cripps, D W. 1986. A facies analysis of Upper Great Oolite Group in Central and Eastern England. (University of Aston in Birmingham: Unpublished PhD thesis.) | |||
| Thompson, B. 1924. The geology of Roade Cutting. Geological Magazine Vol.61, 210-218. | |||
| Thompson, B. 1927. Lime Resources of Northamptonshire. (Northampton: Northamptonshire County Council.) | |||
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E157 E158 E171 E185 E186 E202 E203 | |||