| Computer Code: |
LOCE |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Psammite, semipelite and pelite, interbanded, gneissose and migmatitic. Quartzo-feldspathic segregations common. Commonly garnetiferous. Some subunits are more psammitic; others more pelitic. |
| Definition of Lower Boundary: |
Lower boundary is mainly a structural boundary with the underlying Swordly Thrust. However, thin slivers of strained Lewisianoid gneiss (“Swordly Inlier”) suggest the Loch Coire Formation may be deposited unconformably upon Lewisianoid Gneiss. |
| Definition of Upper Boundary: |
Likely overlain by the Portskerra Formation, but any contact is highly sheared. In part cut by overlying Skinsdale Thrust. |
| Thickness: |
Strongly deformed, possibly > 1 km. |
| Geographical Limits: |
Northern Highlands, Sutherland. Restricted to the Swordly Nappe. |
| Parent Unit: |
Glenfinnan Group (GLEN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| British Geological Survey. 2004. Badenloch. Scotland Sheet 109W. Bedrock. 1:50 000 Series. (Keyworth, Nottingham: British Geological Survey.) |
| Strachan, R A, May, F and Barr, D, 1988. The Glenfinnan and Loch Eil Divisions of the Moine Assemblage. 32-45 IIV Winchester, J A (editor). Later Proterozoic stratigraphy of the Northern Atlantic regions (Glasgow and London: Blackie). |
| 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. |
| Strachan, R A, and Holdsworth, R. 1988. Basement-cover relationships and structure within the Moine rocks of central and southeast Sutherland. Journal of the Geological Society, Vol. 145, 23-36. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S094
S094
S102
S108
S109
S109
S103
|
