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)
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Previous Name(s): |
none recorded or not applicable
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Alternative Name(s): |
none recorded or not applicable
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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
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