| Computer Code: |
O |
Preferred Map Code: |
O |
| Status Code: |
Full |
| Age range: |
Arnsbergian Substage (CG)
— Arnsbergian Substage (CG) |
| Lithological Description: |
A thick marine mudstone and siltstone, with the the Orchard Limestone near the base. |
| Definition of Lower Boundary: |
Generally seen as a change from fluvial sandstone and overlying seatearth or coal, if present, to marine mudstone within the Upper Limestone Formation. |
| Definition of Upper Boundary: |
Generally seen as a change to upward-coarsening arenaceous strata within the Upper Limestone Formation. |
| Thickness: |
Up to 20m in the Stirling, Airdrie, Falkirk and Glasgow districts. |
| Geographical Limits: |
Distributed throughout most of the outcrop and subcrop of the Upper Limestone Formation in the Midland Valley of Scotland. |
| Parent Unit: |
Upper Limestone Formation (ULGS)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Arden "basin". Hinxman et al., 1920. |
| Reference Section |
Mossneuk Borehole [BGS Reg. No. NS 88 NE/204] south of Alloa, with a base unit depth of 591m, and total thickness of 16m. |
| 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). |
| 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). |
| Monro, S K. 1999. Geology of the Irvine District. Memoir of the British Geological Survey, Sheet 22W and part of 21E (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S023
S033
S040
S041
|
