| Computer Code: |
PORK |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Psammite and minor semipelite, gneissose, migmatitic. Local calc-silicate bands and rare quartzite. |
| Definition of Lower Boundary: |
Upon the Loch Coire Formation (LOCE), but contact is strongly sheared. |
| Definition of Upper Boundary: |
Not exposed; cut by the Strath Halladale Granite. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Northern Highlands: East Sutherland and Caithness. Restricted to the Swordly Nappe. |
| Parent Unit: |
Loch Eil Group (LEIL)
|
| Previous Name(s): |
Portskerra Formation [Obsolete Name and Code: Use PORK]
(-3622)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Holdsworth, R E, Strachan, R A and Harris, A L, 1994. Precambrian rocks in northern Scotland east of the Moine Thrust: The Moine Supergroup in Gibbons, W and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, No.22. |
| British Geological Survey. 2003. Bedrock and superficial deposits. Scotland Sheet 115E (Reay). 1:50 000. |
| 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: |
|
S109
S109
S115
S115
|
