| Computer Code: |
MHF |
Preferred Map Code: |
MHF |
| Status Code: |
Full |
| Age range: |
Tremadoc Series (O1)
— Arenig Series (OR) |
| Lithological Description: |
Volcanic agglomerate with subordinate tuff and chert. The volcanic lava clasts are remarkable in containing large and abundant phenocrysts of clinopyroxene and plagioclase, with some olivine. |
| Definition of Lower Boundary: |
Not seen: cut out by the Stinchar Valley Fault. |
| Definition of Upper Boundary: |
Not seen: faulted against serpentinite of the Ballantrae Ophiolite Complex. |
| Thickness: |
At least 500m |
| Geographical Limits: |
Ballantrae area, 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 on the hillside between Ballantrae Castle and the summit of Mains Hill. Stone and Smellie, 1988. |
| Reference(s): |
| 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.] |
| Thirlwall, M F and Bluck, B J, 1984. Sr-Nd isotope and geological evidence that the Ballantrae "ophiolite", SW Scotland, is polygenetic. 215-230 in Gass, I G, Lippard, S J and Shelton, A W (editors), Opiolites and oceanic lithosphere. Special Publication of the Geological Society of London, No.13. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S007
|
