| Computer Code: |
CIL |
Preferred Map Code: |
CIL |
| Status Code: |
Full |
| Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
| Lithological Description: |
Polymict breccia of basalt, amphibolite and various granite clasts, interbedded with some basaltic pillow lavas and rare chert beds. |
| Definition of Lower Boundary: |
Base of the lowest breccia bed, overlying pillow lavas of the Balcreuchan Group (undivided). |
| Definition of Upper Boundary: |
Top of the highest breccia bed where it is overlain by pillow lavas of the Balcreuchan Group (undivided). |
| Thickness: |
About 100m |
| Geographical Limits: |
Northeast of Colmonell, Ayrshire, southwest Scotland. |
| Parent Unit: |
Balcreuchan Group (BCN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Crags and roches moutonnees in moorland on the southern flanks of Craig Hill. There are two areas of exposure: one around Garnaburn, the other at Craig Farm. Stone and Smellie, 1988. |
| Reference(s): |
| Balsillie, D. 1937. Further observations on the Ballantrae igneous complex, south Ayrshire. Geological Magazine, Vol. 74, 20-33. |
| Stone, P and Smellie, J L, 1988. Classical areas of British Geology: The Ballantrae area: a description of the solid geology of parts of 1:25 000 sheets NX 08, 18 and 19. [London: HMSO for British Geological Survey.] |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S007
|
