Computer Code: |
GTMS |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Pelite: garnet-mica schist. |
Definition of Lower Boundary: |
Locally overlying Sand Voe Psammite Formation or Hillswick Psammite Formation; or in contact with Eastern Gneisses (EGNS). |
Definition of Upper Boundary: |
Overlain by rocks of the Queyfirth Group (QYFH) (equivalent of Dalradian), separated by a shear zone (Virdibreck Shear Zone). |
Thickness: |
c. 300 m: deformed. |
Geographical Limits: |
Shetland; NW Mainland, west of the Walls Boundary Fault. |
Parent Unit: |
Sand Voe Group (SDVO)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
British Geological Survey. 2004. Northmaven, Scotland Sheet No. 129, 1:50,000 scale. |
Flinn, D. 1988. The Moine rocks of Shetland. In: Later Proterozoic Stratigraphy of the Northern Atlantic Regions, p. 74-85. Winchester, J A (editor). (Blackie.) |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S129
|