| Computer Code: |
AOBG |
Preferred Map Code: |
AB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Schistose semipelite and micaceous psammite with white quartzite beds locally abundant in the type area. |
| Definition of Lower Boundary: |
Boundary between platy feldspathic psammites of the Inverlair Psammite Formation and schistose micaceous psammites and semipelites. Base where micaceous psammite and semipelite become dominant. |
| Definition of Upper Boundary: |
Transitional boundary into overlying Kinlochlaggan Quartzite Formation marked by either increasing psammite in locally increasing proportion of interbanded quartzite. Top at point where quartzite becomes dominant. |
| Thickness: |
Generally to 200m but c.500m in the Aonach Beag area. |
| Geographical Limits: |
Ardverikie Forest, southern Central Highlands of Scotland, largely on 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: |
| Reference Section |
Coire an Iubhair Mor on upper north-east flank of Geal Charn. |
| Type Section |
NW ridge of Aonach Beag and western side of Coire na Coichille. |
| Reference Section |
Allt Liath nam Badan - burn section. |
| 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
S063
|
