Computer Code: |
CORG |
Preferred Map Code: |
SYMB |
Status Code: |
Full |
Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
Lithological Description: |
Limestone, bluish-grey, crystalline, commonly thinly banded, with chert lenses. Blocky to flaggy, rarely massive. Tight to isoclinal internal folding common in parts. |
Definition of Lower Boundary: |
Lower limit of crystalline limestone within pelites and semipelites of Tornahaish Dark Schist and Limestone Formation. |
Definition of Upper Boundary: |
Upper limit of crystalline limestone within Tornahaish Dark Schist and Limestone Formation. Schistose calcareous semipelite above. Thence non-calcareous semipelite. |
Thickness: |
12 - 20m. Typically 15m, may be thinner and impure by Allargue House. |
Geographical Limits: |
On Upper Donside, mainly near Corgarff and Corgarff Castle. Intermittent outcrops extend southeast from Tornahaish to Mammie Hill: also north of Delnadamph. |
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
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Stratotypes: |
Type Section |
Luib Quarry. |
Reference Section |
Quarry, 310m west of Corgarff Castle. |
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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