| Computer Code: |
MACF |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devonian Period (D)
— Devonian Period (D) |
| Lithological Description: |
Ordovician strata of the Moffat Shale Group, Shinnel and Glen Lee formations, Silurian strata of the Gala Group and Siluro-Devonian minor intrusions are metamorphosed to biotite hornfels or, locally, calc-silicate skarn within the thermal metamorphic aureole of the Cairnsmore of Fleet Pluton. |
| Definition of Lower Boundary: |
Outer boundary of the aureole is mapped at the first observation of a purple tint to sandstone, caused by the development of microscopic biotite in the matrix. |
| Definition of Upper Boundary: |
Margin of the Cairnsmore of Fleet Pluton. |
| Thickness: |
Mapped as between 800m and 6km in width. |
| Geographical Limits: |
Aureole rocks are exposed all around the Cairnsmore of Fleet Pluton from Creetown in the south [NX 47 58], Blackcraig in the west [NX 64 44], Loch Ken to the east [NX 65 73] and St Johns Town of Dalry to the north [NX 62 80]. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Traverse up Grey Mare's Tail Burn from the margin of the Cairnsmore of Fleet, through the aureole rocks to the mapped limit of thermal metamorphosed rocks in Poultrybuie Burn. |
| Reference Section |
Culchronchie Burn to Culchronchie Hill. [Barnes, in press]. |
| Reference(s): |
| Barnes, R P. 2008. The geology of the Whithorn, Kirkcowan and Wigtown district. Memoir of the British Geological Survey, Sheets 4W, 4E and 2 (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S005
S006
S009
S008
|
