| Computer Code: |
ILS |
Preferred Map Code: |
ILS |
| Status Code: |
Full |
| Age range: |
Pendleian Substage (CE)
— Pendleian Substage (CE) |
| Lithological Description: |
A pale to dark grey bioclastic (crinoidal) marine limestone, with algal nodules. The name is not geographical in origin, but indicates a marker bed for the Limestone Coal Formation coal seams below. |
| Definition of Lower Boundary: |
Generally a conformable change from a marine mudstone almost at the top of the Limestone Coal Formation. The Index Limestone as it is usually called, forms the base of the Upper Limestone Formation. |
| Definition of Upper Boundary: |
Generally a conformable change to a thick marine mudstone, which may also include the Huntershill Limestone, that passes up into deltaic arenaceous deposits of the Upper Limestone Formation. |
| Thickness: |
From 0.6 m to 2.2 m in the Airdrie, Falkirk and Glasgow districts, and 3 m in the Irvine area of Ayrshire. |
| Geographical Limits: |
Throughout most of the outcrop of the Upper Limestone Formation of the Midland Valley of Scotland, but locally absent in Ayrshire and Strathclyde on highs partly created by the Clyde Plateau Volcanic Formation and poorly developed in central and east Fife because of an on-delta facies change. |
| Parent Unit: |
Upper Limestone Formation (ULGS)
|
| Previous Name(s): |
Cowglen Limestone [Obsolete Name and Code: Use ILS]
(-1611)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
The Mossneuk Borehole, BGS reg. no. NS88NE/204 south of Alloa, with a base at 770 m depth, and 0.93 m measured thickness. |
| Reference(s): |
| 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). |
| 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. |
| Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Airdrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). |
| Monro, S K. 1999. Geology of the Irvine District. Memoir of the British Geological Survey, Sheet 22W and part of 21E (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). |
| Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S015
S023
S013
S031
S031
S025
S024
S015
S338
S014
S023
S024
S033
S032
S032
S040
S030
S039
S039
|
