| Computer Code: |
IBGC |
Preferred Map Code: |
IB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Tremolite-rich calc-silicate schist with layering produced by variations in mica content. Minor semipelite. |
| Definition of Lower Boundary: |
Where tremolite schist becomes dominant overlying the magnetite-semipelite of the underlying Sron Garbh Formation. Rapid transition. |
| Definition of Upper Boundary: |
At the top of the highest tremolite schist unit - overlain by semipelites of the Coire Cheap Formation. |
| Thickness: |
c. 60m at most. More typically 10m |
| Geographical Limits: |
Ardverikie Forest between An Lairig [NN 50 77] and the Allt Mhainisteir [NN 53 86]. Sheet 63E [Dalwhinnie]. |
| Parent Unit: |
Appin Group (APP)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Southeast flank of Geal Charn, between Coire an Iubhair Beag and 500m NE of Loch A'Bhealaich Leambain. |
| Reference Section |
NE steep rocky shoulder of Sron Garbh. |
| Reference(s): |
| Robertson, S and Mendum, J R, in press. Lithostratigraphy of the Grampian and Appin Groups in the Dalwhinnie district, sheet 63E, Scotland. British Geological Survey Technical Report. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S063
|
