The BGS Lexicon of Named Rock Units — Result Details

Fethaland Garnet Mica Schist Formation

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