| 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. 74-85 in Later Proterozoic Stratigraphy of the Northern Atlantic Regions. Winchester, J A (editor). (Blackie.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S129
|
