The BGS Lexicon of Named Rock Units — Result Details
Kevin Limestone Formation
| Computer Code: | KV | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Asbian Substage (CR) — Asbian Substage (CR) | ||
| Lithological Description: | Pale grey, thickly bedded, internally massive, fine- to coarse-grained biosparite limestone, with prominent bedding planes, some with brown pedogenic crusts and bentonite clay partings. The formation includes two areas of knoll-reefs. | ||
| Definition of Lower Boundary: | Disconformity above the well-bedded, grey to dark grey, medium- to fine-grained limestones of the Milldale Limestone Formation. The disconformity is locally overlain by a localised, poorly sorted conglomerate with pebbles of reef-limestone and sparse quartz grains. Elsewhere the base of the formation is taken at the base of the lowermost thickly-bedded, pale grey limestone above the disconformity. | ||
| Definition of Upper Boundary: | Disconformity overlain sharply by dark grey, siliceous mudstones of the Craven Group, with local erosional scouring into the top of the formation | ||
| Thickness: | At least 150 m thickness in the type area, although poorly constrained, and thins northward of the type area to 80-150m in the Hopten's Cross area [SK 072 481], and to the east of the type locality, the formation is cut out by Namurian overstep. | ||
| Geographical Limits: | Seen in outcrop in the Weaver Hills [SK09 46] , and probably present in the subsurface part of the Hathern shelf, of Staffordshire. | ||
| Parent Unit: | Peak Limestone Group (PKLM) | ||
| Previous Name(s): | Kevin Limestones [Obsolete Name and Code: Use KV]
(-1635)
Lower Waterhouses Limestone [Obsolete Name And Code: Use Kv] (LWTH) Waterhouses Limestone [Obsolete Name And Code: Use KV] (WTH) Upper Waterhouses Limestone [Obsolete Name And Code: Use KV] (UWTH) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Kevin Quarry: a 131m thick section,although the base and top of the formation are not seen. | ||
| Reference(s): | |||
| Chisholm, J I, Charsley, T J and Aitkenhead, N. 1988. Geology of the country around Ashbourne and Cheadle. Memoir of the British Geological Survey, Sheet 124 (England and Wales). | |||
| Aitkenhead, N, and Chisholm, J I. 1982. A standard nomenclature for the Dinantian formations of the Peak District of Derbshire and Staffordshire. Report of the Institute of Geological Sciences, No. 82/8. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E124 | |||