The BGS Lexicon of Named Rock Units — Result Details

Scottish Lower Coal Measures Formation

Computer Code: LCMS Preferred Map Code: LCMS
Status Code: Pending Upgrade
Age range: Langsettian Substage (CA) — Langsettian Substage (CA)
Lithological Description: Sandstone, siltstone and mudstone in repeated cycles that most commonly coarsen upwards, but also fine upwards locally, with seatclay or seatearth and coal at the top. The mudstone and siltstone are usually grey to black, while the sandstone is fine- to medium-grained and off-white to grey. Coal seams are common and many exceed 0.3m in thickness.
Definition of Lower Boundary: Base of the Lowstone Marine Band, or its local correlative, or at the appropriate place of disconformity.
Definition of Upper Boundary: Base of the Vanderbeckei (Queenslie) Marine Band.
Thickness: 90 to 340m
Geographical Limits: Scotland.
Parent Unit: Scottish Coal Measures Group (CMSC)
Previous Name(s): Lower Coal Measures (Scotland) (-1017)
Productive Coal Measures (Part) (-4753)
Lower Coal Measures Formation [Obsolete Name And Code: Use PLCM, SWLCM, LCMS] (LCM)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Borehole section, bore at Clyde Bridge NS75NW/68, 102 fathoms, 3 feet, 2 inches (187.50m) to 164 fathoms, 4 feet, 2 inches (301.19m). 
Reference(s):
MacGregor, A G, 1960. Division of the Carboniferous on Geological Survey Scottish Maps. Bulletin of the Geological Survey of Great Britain, No.16, 127-130. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S031 S031 S030 S022 S023 S012 S015 S013 S015 S011 S338 S014 S023 S032 S039 S040 S041