| Computer Code: |
APAL |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Semipelites with subsidiary psammites, generally phyllitic, more calcareous in its upper part. Distinctive white limestone bands typically. Also grey finely crystalline limestones and calc-silicate bands. In Glenlivet-Glen Suie area divided into three members. |
| Definition of Lower Boundary: |
At upper limit of quartzite of the Corryhabbie Quartzite Formation and at lowest occurrence of white limestone or semipelite. |
| Definition of Upper Boundary: |
Rapid gradation from calcareous semipelite and limestone to graphitic pelite/semipelite of Clashnoir Semipelite Formation. |
| Thickness: |
40 - 600m. |
| Geographical Limits: |
Extends from Muckle Allt Venney (Glen Markie) southwest to Glenfiddich, Upper Glenlivet and Glen Suie to the Kylnadrochit-Fodderletter area (Strathavon), Water of Ailnack section and Glen Avon (Burn of Little Fergie to Foal's Crag) and Glen Builg. Southern limit - Loch Builg. |
| Parent Unit: |
Ballachulish Subgroup (DABH)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Tor of Suie area, Glen Suie. |
| Type Section |
Central section of water of Ailnack gorge around junction with Allt Dearcaige. |
| Reference(s): |
| Memoir of the British Geological Survey, Sheet 75, in preparation. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S075
S086
|
