The BGS Lexicon of Named Rock Units — Result Details
Kirton Cementstone Beds (Knoll-Reef) [Obsolete: use LLL]
| Computer Code: | KCMK | Preferred Map Code: | K |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Bajocian Age (JB) — Bajocian Age (JB) | ||
| Lithological Description: | [Obsolete: use LLL] Limestone (calcilutite and wackestone), commonly accummulated around a framework of corals, bivalves and other organisms, forming localised lenticular bodies typically less than 100m in lateral extent ("knoll-reef"). | ||
| Definition of Lower Boundary: | Conformable contact between the underlying mudstones of the Kirton Cementstone or peloidal and ooidal wackestones and packstones of the Scawby Limestone and coralliferous limestone of the knoll-reef. | ||
| Definition of Upper Boundary: | Conformable contact between coralliferous limestone of the knoll-reef and overlying mudstones of the Kirton Cementstone. | ||
| Thickness: | 0 to 5 m. | ||
| Geographical Limits: | BGS 1:50 000 sheets 89, 102 and 114; North Lincolnshire, Lincoln to the Humber, | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Coral Knoll (in Kirton Cementstones) [Obsolete Name and Code: Use KCMK]
(-3492)
Coralline knolls of patch-reef type [Obsolete Name and Code: Use KCMK] (-340) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Greetwell Quarry on eastern outskirts of Lincoln. Knoll reef up to 5m thick and 75m across within Kirton Cementstone Beds seen in eastern face. Cox and Sumbler, 2002. 295-297. | ||
| Reference(s): | |||
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] | |||
| Gaunt, G D, Fletcher, T P and Wood, C J. 1992. Geology of the country around Kingston upon Hull and Brigg. Memoir of the British Geological Survey, sheets 80 and 89 (England and Wales). 172pp. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||