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): Upper Waterhouses Limestone [Obsolete Name And Code: Use KV] (UWTH)
Lower Waterhouses Limestone [Obsolete Name And Code: Use Kv] (LWTH)
Waterhouses Limestone [Obsolete Name And Code: Use KV] (WTH)
Kevin Limestones (-1635)
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