| Computer Code: |
DUFF |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Mid to dark grey, fine- to coarse-grained limestone with some dolostone; pelitic in places, but generally pure. |
| Definition of Lower Boundary: |
At the top of the underlying calcareous phyllites and semipelites, with thin limestone laminae of the Pitlurg Formation, where they give way to uniform limestone. |
| Definition of Upper Boundary: |
At the top of the limestone where it gives way to pelites and semipelites of the Mortlach Graphitic Schist. |
| Thickness: |
Very variable; laterally impersistent. Thickened by folding in part. In Glenrinnes c. 150m thick. |
| Geographical Limits: |
Banffshire coast at Sandend southwest along strike of Dalradian Supergroup outcrop to Cairngorms. |
| Parent Unit: |
Mortlach Graphitic Schist Formation (MOGS)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Parkmore Quarry, Parkmore, Dufftown; quarry face. |
| Type Section |
Stream section, Corriehabbie Burn, Folds of Corriehabbie, Glen Rinnes. |
| Reference(s): |
| Thomas, C W, 1989. Application of geochemistry to the stratigraphic correlation of Appin and Argyll Group carbonate rocks from the Dalradian of northeast Scotland. Journal of the Geological Society, London, Vol.146, 631-647. |
| Memoir of the British Geological Survey, Sheet 75, in preparation. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S086
S096
|
