| Computer Code: |
LNES |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Dominantly semipelite, pelite, or striped semipelite-psammite units in the lower part, and psammite with subsidiary quarzite in the upper part. |
| Definition of Lower Boundary: |
Locally unconformably overlying Lewisian Gneiss, inferred to be uncomformable over the Wester Ross Supergroup. Commonly the base is formed by the Sgurr Beag Thrust or associated ductile thrusts. |
| Definition of Upper Boundary: |
Stratigraphic top not exposed. Commonly uncomformably overlain by Old Red Sandstone of Silurian-Devonian age. In the Central Highlands, inferred to be uncomformably overlain by the Grampian Group (Dalradian Supergroup). |
| Thickness: |
Greater than 6 km possibly, possibly as much as 9 km. |
| Geographical Limits: |
Northern Highlands from Sutherland to Loch Ness; Central Highlands (Badenoch Group). |
| Parent Unit: |
Not Applicable (-)
|
| 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, Strachan R A, Prave A. 2021. A new stratigraphic framework for the early Neoproterozoic successions of Scotland. Journal of the Geological Society of London. doi:10.1144/jgs2021-054 |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
