| Computer Code: |
SOCG |
Preferred Map Code: |
SCV |
| Status Code: |
Index Level |
| Age range: |
Emsian Age (DE)
— Emsian Age (DE) |
| Lithological Description: |
Subvolcanic explosion-breccia composite vent, comprising: carbonated vent agglomerate of wacke clasts in a fine-grained comminuted igneous matrix, altered bioitite-bearing olivine basaltic intrusion and kersantite intrusions. |
| Definition of Lower Boundary: |
The intrusive contacts with the country rock of Llandovery Turbidites is poorly exposed, which together with diffuse internal structures, makes field relationships difficult to define. |
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
Thickness not known, but individual vents vary from 5 x 50 m, to 250 x 100m. This unit may be one vent with two small subsidiary vents. |
| Geographical Limits: |
Kirkcudbright Sheet 5W (Scotland) |
| Parent Unit: |
Black Stockarton Moor Subvolcanic Complex (BSTM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
A composite vent on the west side of Kirkcudbright Bay at Shoulder o' Craig, about 2 km south-west of Kirkcudbright. Rock, Cooper & Gaskarth. 1986 |
| Reference(s): |
| Leake, R C and Cooper, C. 1983. The Black Stockarton Moor Subvolcanic Complex, Galloway. Journal of the Geological Society, London. Vol. 140, 665-676. |
| Rock, N M S, Cooper, C and Gaskarth, J W. 1986 Late Caledonian subvolcanic vents and associated dykes in the Kirkcudbright area, Galloway, South-West Scotland. Proceedings of the Yorkshire Geological Society, Vol. 46, 29-37. |
| Lintern, B C and Floyd, J D. 2000. Geology of the Kirkcudbright-Dalbeattie District. Memoir of the British Geological Survey, Sheets 5W, 5E and part of 6W (Scotland). |
| Stone, P. 1999. Shoulder O' Craig. 556-559 in Caledonian igneous rocks. Stephenson, D, Bevins, R E, Millward, D, Highton, A J, Parsons, I, Stone P, and Wadsworth, W J. GCR Series, No.17. ( Peterborough: Joint Nature Conservation Committee.) |
| Stone, P, Cheeney, R F and White, D E, 1996. Excursions in geology in southwest Scotland. An Excursion Guide, p. 49-51. (Keyworth, Nottingham: British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S005
|
