The BGS Lexicon of Named Rock Units — Result Details

Second Hosie Limestone

Computer Code: SHLS Preferred Map Code: SHLS
Status Code: Full
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: A pale to dark grey, argillaceous, crinoidal, shelly bioclastic limestone, interpreted to be of marine origin. Thicker occurrences consist of calcareous mudstone and lime mudstone with a dolomitic top.
Definition of Lower Boundary: Generally seen as a conformable change from marine mudstone within the Lower Limestone Formation, underlain by Lillie's Shale Coal in the Glasgow area. Not uncommon for Second and Top Hosie limestone to be separated by only marine strata or even to become fused together.
Definition of Upper Boundary: Generally seen as a conformable change to marine mudstone within the Lower Limestone Formation.
Thickness: Generally up to 0.38m, and locally up to 2.10m in the Airdrie, Falkirk and Glasgow districts. This limestone fuses with the Top Hosie Limestone in the west Glasgow district and at Wairdlaw [NS 995 731] in the Bathgate Hills. In shelf settings, such as in Midlothian, it can be as much as 15m thick.
Geographical Limits: Located throughout most of the outcrop of the Lower Limestone Formation of the Midland Valley of Scotland, but locally difficult to recognize in Ayrshire and Lanarkshire where the Hosie limestones join together as the McDonald Limestone in a shelf setting.
Parent Unit: Lower Limestone Formation (LLGS)
Previous Name(s): Bilston Burn Limestone [Obsolete Name And Code: Use SHLS] (BIBU)
Mid Kinniny Limestone [Obsolete Name And Code: Use SHLS] (MIKI)
Alternative Name(s): none recorded or not applicable
Reference Section  Wester Gartshore Colliery Underground Borehole, BGS reg. no. NS67SE/99 at Kirkintilloch, northwest of Airdrie, where it is 0.71m thick, and consists of two leaves, with a unit base at 88.85m depth. 
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). 
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). 
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. 
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. 
Lexique Stratigraphique International. 1971. Volume 1, Europe, Fascicule 3a, England, Wales and Scotland, Part 3a VII, Lower Carboniferous (Dinantian). 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S032 S031 S031 S032 S040 S030 S040 S041