The BGS Lexicon of Named Rock Units — Result Details

Holme High Limestone Group

Computer Code: HOHI Preferred Map Code: HOHI
Status Code: Pending Upgrade
Age range: Chadian Substage (CI) — Brigantian Substage (CX)
Lithological Description: A pale to dark grey, typically darker towards the base, micritic to crystalline limestone, with subordinate partings and thin beds of dark grey shale, and locally abundant chert , crinoid and brachiopod debris. A thin vesicular brecciated basalt is present near the base of the type locality, and dolostone or dolomitic limestone is predominant in the basal 120m above this.
Definition of Lower Boundary: The base of grey and grey-brown dolostone of the Holme High Limestone Group, resting unconformably upon Lower Palaeozoic green slate strata in the type locality.
Definition of Upper Boundary: The sharply conformable base of overlying dark grey, carbonaceous, fissile mudstone of the Bowland Shale Formation, above the pale grey limestone of the Holme High Limestone Group.
Thickness: Seen as 613 m in the type locality, with an estimated maximum of about 1250 m.
Geographical Limits: Not seen at outcrop, but proved in the subsurface over the Holme High, a W-E structure extending from Heywood [SD 80 10] to Holmfirth [SE 20 10], bounded to the north by the Holme and Heywood faults, and to the south by the Alport Basin.
Parent Unit: Carboniferous Limestone Supergroup (CL)
Previous Name(s): Carboniferous Limestone [Obsolete entry, see Supplementary Information] (-4550)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Not seen at the surface, but present in the Wessenden-1 Borehole (SE00NE/7) from 489.5 to 1103.3 m depth, displaying the entire thickness of the formation. Evans and Kirby, 1999 
Reference(s):
Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. 
Waters, C N, Barclay, W J, Davies, J R and Waters, R A. In press. Stratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/05/06. 
Evans, D J, and Kirby, G A. 1999. The architecture of concealed Dinantian carbonate sequences over the Central Lancashire and Holme highs, northern England. Proceedings of the Yorkshire Geological Society, Vol. 52, 297-312. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E085 E086