| Computer Code: |
LWM |
Preferred Map Code: |
LWM |
| Status Code: |
Full |
| Age range: |
Brigantian Substage (CX)
— Brigantian Substage (CX) |
| Lithological Description: |
Cyclothemic sequence of mudstone, siltstone, sandstone with seatearths, coals and marine limestones. Marine bands in upper part, conglomerate in lowest part in some areas. |
| Definition of Lower Boundary: |
Rests on volcanic detritus (Kirkwood Formation) in type section; on Clyde Plateau Volcanic Formation in some areas. |
| Definition of Upper Boundary: |
At base of Hurlet Limestone (base of Lower Limestone Formation) as in type section. |
| Thickness: |
254.52m in type section. |
| Geographical Limits: |
Neighbourhood of Lawmuir, Clydebank, Strathclyde, Scotland. |
| Parent Unit: |
Strathclyde Group (SYG)
|
| Previous Name(s): |
Upper Sedimentary Group [Obsolete Name and Code: Use LWM]
(-4776)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
British Geological Survey Lawmuir Borehole (BGS Reg.No. NS57SW/162) from 11.75 to 266.20m. |
| Reference(s): |
| Paterson, I B and Hall, I H S. 1986. Lithostratigraphy of the late Devonian and early Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Report, 18/3. |
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
| Dean, M T, Browne, M A E, Waters, C N, and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report RR/10/007. 165 pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S030
S031
S003
S023
S013
S015
S338
S023
S030
S039
|
