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): |
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. |
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
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