| Computer Code: |
ALGS |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Schistose graphitic pelite and subsidiary semipelite. Banded, slaty in parts. |
| Definition of Lower Boundary: |
At lower limit of graphitic pelite. Overlying calcareous semipelites and psammites of the Cock Burn Calcarous Schist Formation. |
| Definition of Upper Boundary: |
At upper limit of graphitic pelite where it passes into semipelites of the Tornahaish Dark Schist and Limestone Formation. |
| Thickness: |
15 - 90m. |
| Geographical Limits: |
Poorly exposed on the valley sides in Upper Donside (around Corgarff and Allargue). Extends southeast approximately along A939 to Upper Fenzie. |
| Parent Unit: |
Tornahaish Dark Schist And Limestone Formation (TDSL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Quarry 250m WNW of Allargue Arms Hotel. |
| 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
|
