| Computer Code: |
VAPE |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Garnet-muscovite-biotite bearing, schistose pelite and semipelite, interbanded with psammitic units. Generally strongly deformed. |
| Definition of Lower Boundary: |
Overlies the Glascarnoch Psammite Formation at its eastern margin, where predominantly psammitic lithologies pass gradationally into predominantly pelitic lithologies. |
| Definition of Upper Boundary: |
Overlain by the Crom Psammite Formation at its western maargin, where predominantly pelitic lithiloigies pass gradationally into predominantly psammitic lithologies. |
| Thickness: |
c. 300 m (estimate; unit is strongly deformed) thinner to SW and NE. |
| Geographical Limits: |
NW Highlands, Central Ross-shire to Sutherland. |
| Parent Unit: |
Morar Group (MORR)
|
| Previous Name(s): |
Lower Pelite
(-598)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Eastern slopes of Seana Bhraigh [NH 287 866 - NH 310 853]. |
| Reference Section |
Reference area: south of Braemore Junction: Creag Dubh to Meall a’ Chrasgaidh [NH 215 763 - NH 186 737]. |
| Reference(s): |
| Shepherd, J. 1970. The structure and metamorphism of the Carn Chuinneag area, Ross-shire. (University of Edinburgh.: unpublished PhD thesis.) |
| Wilson, D. 1975. Structure and metamorphism of the Ben Wyvis District, Ross-shire. (University of Edinburgh: Unpublished PhD thesis.) |
| Bonsor, H C, Strachan, R A, Prave, A, and Krabbendam, M. 2010. Fluvial braidplain to shallow marine transition in the early Neoproterozoic Morar Group, Fannich Mountains, northern Scotland. Precambrian Research 183, 791-804. |
| Bonsor, H, Strachan, R, Prave, A, and Krabbendam, M. 2012. Sedimentology of the early Neoproterozoic Morar Group in northern Scotland: implications for basin models and tectonic setting. Journal of the Geological Society of London 169, 53-65. |
| 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. |
| Sutton, J, and Watson, J. 1955. The structure and stratigraphical succession of the Moines Fannich Forest and Strath Bran, Ross-shire. Quarterly Journal of the Geological Society, Vol. 110, 432-434. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S083
S093
S093
|
