The BGS Lexicon of Named Rock Units — Result Details

Hurlet Limestone

Computer Code: HUR Preferred Map Code: HUR
Status Code: Full
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: A pale to dark grey, crinoidal, and shelly bioclastic limestone, interpreted to be of marine origin, containing argillaceous partings where it is thickly developed.
Definition of Lower Boundary: Generally seen as a conformable change from marine mudstone overlying the Hurlet Coal at the top of the Lawmuir Formation or West Lothian Oil-Shale Formation in West Lothian, or a coal at the top of the Pathhead Formation in Fife, or Aberlady Formation in East Lothian.
Definition of Upper Boundary: Generally seen as a conformable change to thick marine mudstone that passes up into deltaic arenaceous deposits of the Lower Limestone Formation.
Thickness: From 0.75m to 1.5m, and locally 11m, in the Airdrie, Falkirk and Glasgow districts. In shelf settings, such as in Midlothian, it can be as much as 14m thick.
Geographical Limits: Located throughout the outcrop and subcrop of the Lower Limestone Formation of the Midland Valley of Scotland, but locally absent in Ayrshire and Strathclyde on highs, largely created by the Clyde Plateau Volcanic Formation.
Parent Unit: Lower Limestone Formation (LLGS)
Previous Name(s): Hawthorn Limestone Member [Obsolete Name And Code: Use HUR] (HAWL)
Charlestown Station Limestone [Obsolete Name And Code: Use: HUR] (CHSL)
St Monans Brecciated Limestone [Obsolete Name And Code: Use HUR] (STMB)
Gilmerton Limestone (*116)
West Kirkton Limestone [Obsolete Name And Code: Use HUR] (WKL)
Upper Crichton Limestone [Obsolete Name And Code: Use HUR] (UCRC)
Douglas Main Limestone [Obsolete Name And Code: Use HUR] (DMLS)
Gilmerton Limestone [Obsolete Name And Code: Use HUR] (GILS)
Upper Longcraig Limestone [Obsolete Name And Code: Use HUR] (ULOL)
Broadstone Limestone [Obsolete Name And Code: Use HUR] (BRLS)
Patna Limestone [Obsolete Code: Use HUR] (PALS)
Upper Longcraig Limestone (*160)
Alternative Name(s): Murrayshall Limestone
Stratotypes:
Type Area  Hurlet, southwest of Glasgow. Hinxman et al., 1920. 
Reference Section  Wester Gartshore Colliery Underground Borehole, BGS reg. no. NS67SE/99, at Kirkintilloch NW of Airdrie, measured as 0.86m thick with a base at 292.63m depth. Hurlet is in southwest Glasgow. 
Reference(s):
Hinxman, L W, Anderson, E M and Carruthers, R G. 1920. The economic geology of the Central Coalfield of Scotland, Area IV; Paisley, Barrhead, Renfrew. Memoir of the Geological Survey, Scotland. 
Cameron, I B, Aitken, A M, Browne, M A E and Stephenson, D. 1998. Geology of Falkirk District. Memoir of the British Geological Survey Sheet 31E (Scotland). 
Browne, M A E, Dean, M T, Hall, I H S, McAdam, A D Monro, S K and Chisholm, J I. 1999. A lithostratigraphical framework for the Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Research Report, RR/99/07. 
Hall, I H S, Browne, M A E and Forsyth, I H. 1998. Geology of the Glasgow district. Memoir of the British Geological Survey, Sheet 30E (Scotland). 
Robertson, T, Simpson J B and Anderson J G C. 1949. The Limestones of Scotland. Special reports on the mineral resources of Great Britain. Vol.35. Memoir of the Geological Survey. 
Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Aidrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S023 S031 S031 S015 S023 S024 S032 S032 S049 S040 S030 S030 S039 S040 S041