| Computer Code: |
PCFL |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Calcareous, banded psammite and semipelite, grey and pale green, normally flaggy. Some beds of impure metalimestone locally. |
| Definition of Lower Boundary: |
At incoming of calcareous (greenish, tremolite-bearing) psammites and semipelites above the non-calcareous Findlater Flag Formation. |
| Definition of Upper Boundary: |
Below graphitic pelites with beds of pure metalimestone comprising the Mortlach Graphitic Schist Formation. |
| Thickness: |
>50 - 1200m (based on outcrop width and average dip). Real thickness is probably closer to lower estimate, owing to prevalent open folds. |
| Geographical Limits: |
Ardonald Anticline, from Blackhillock and Alehousehillock, in the Cairnie area, SW to Achmore, Glen Rinnes. And around Keith from Drummuir to Ardrone (Sheets 85E and 86W). Above Keith Shear Zone - equivalent stratigraphically to Cairnfield Calcareous Formation below the Keith Shear Zone. |
| Parent Unit: |
Lochaber Subgroup (DALO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Burn at Davidston from 150m NW of Hillend to 500m N of Bridge at Blairmoon. |
| Reference Section |
Den of Pitlurg |
| Reference(s): |
| Stephenson, D, et al. 1993. Stratigraphy and correlation of the Dalradian rocks of the East Grampian Project area. British Geological Survey Technical Report WA/93/91. |
| Stephenson, D. 1993. Amphiboles from Dalradian Metasedimentary Rocks of NE Scotland: Environmental Inferences and Distinction from Amphiboles of Meta-Igneous Amphibolites. Mineralogy and Petrology, Volume 49, 45-62. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S085
S086
|
