The BGS Lexicon of Named Rock Units — Result Details
Castlecary Limestone
| Computer Code: | CAS | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Arnsbergian Substage (CG) — Arnsbergian Substage (CG) | ||
| Lithological Description: | A white or pale to dark grey, medium- to fine-grained, crinoidal, bioclastic, locally dolomitic limestone, interpreted to be of marine origin, and containing algal nodules. | ||
| Definition of Lower Boundary: | Generally marked by a change from marine mudstone, or resting on a thin coal or seatrock belonging to the Upper Limestone Formation. | ||
| Definition of Upper Boundary: | Commonly seen as an abrupt change to bituminous non-marine mudstone containing Curvirimula belonging to the Passage Formation. Marine mudstone roof in Fife, except where absent due to penecontemporaneous erosion, especially in the western Midland Valley of Scotland and in the centre of the Kincardine basin, where erosive-based sandstones form the base of the overlying Passage Formation. | ||
| Thickness: | Generally up to 5m, but may be absent due to erosion in areas such as in Strathclyde, Ayrshire and parts of the Stirling district. | ||
| Geographical Limits: | Restricted by penecontemporaneous erosion to Fife (marine roof), the Lothians (in part and with marine roof), and to the east of Glasgow in the Stirling-Clackmannan-Falkirk areas, within the outcrop and subcrop of the Upper Limestone Formation in the Midland Valley of Scotland. | ||
| Parent Unit: | Upper Limestone Formation (ULGS) | ||
| Previous Name(s): | Craigenbush Limestone [Obsolete Name and Code: Use CAS]
(-4516)
Levenseat Limestone [Obsolete Name And Code: Use CAS] (LEVL) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | The unit is 2.12m thick, and seen as 3 leaves, with the unit base at a depth of 337.34 m in the Mossneuk Borehole, BGS Reg. No NS 88 NE/204, south of Alloa. Castlecary is in the northeast corner of the Airdrie district. | ||
| Type Area | The Castlecary area in the northeast corner of the Airdrie (sheet 31W) district. | ||
| Reference(s): | |||
| Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). | |||
| Hinxman, L W, Crampton, C B, Anderson, E M, and Macgregor, M. 1917. The Economic Geology of the Central Coalfield of Scotland; Area II; Denny and Plean, Carron and Grangemouth, Cumbernauld, Castlecary and Bonnybridge, Falkirk and Slamannan, pp24-26. | |||
| Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Airdrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S031 S031 S032 S040 S030 S039 S039 S040 S041 | |||