| Computer Code: |
BID |
Preferred Map Code: |
BID |
| Status Code: |
Full |
| Age range: |
Visean Age (CV)
— Visean Age (CV) |
| Lithological Description: |
Grey mudstones, sandstones and seatearths with coal seams; non-marine. |
| Definition of Lower Boundary: |
Base sharp, probably erosional, on the Clyde Sandstone Formation (top of Inverclyde Group), which is characterised by presence of pedogenic limestone and lack of coal seams. |
| Definition of Upper Boundary: |
Top is marked by the overlying Clyde Plateau Volcanic Formation. May be transitional, with interbedding of sedimentary rocks with lava flows. |
| Thickness: |
c.16m (24m in Ascog Borehole). |
| Geographical Limits: |
Area around Birgidale Knock, south Bute, Scotland. |
| Parent Unit: |
Strathclyde Group (SYG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
BGS Birgidale Knock Borehole, South Bute, Scotland. BGS Ref. No. NS05NE/2 from 32.86m to 54.10m. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S029
|
