Computer Code: |
SUIS |
Preferred Map Code: |
symb |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Semipelite, either coarse and schistose, or gneissose and migmatitic. Locally thin layers of psammite. |
Definition of Lower Boundary: |
Conformable upon the Kildonan Psammite Formation (KILD), with a gradational (100 m) boundary marked by increasing semipelitic layers. |
Definition of Upper Boundary: |
Overlain by the Scaraben Quartzite Formation (SCAB), but contact not exposed. |
Thickness: |
none recorded or not applicable
|
Geographical Limits: |
Northern Highlands: East Sutherland and Caithness. Restricted to the Skinsdale Nappe. |
Parent Unit: |
Loch Eil Group (LEIL)
|
Previous Name(s): |
Suisgill Semi-Pelite [Obsolete Name and Code: Use SUIS]
(-4907)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Strachan, R A, 1989. The metamorphic rocks of the Scaraben area, East Sutherland and Caithness. Scottish Journal of Geology, Vol.24, 1-13. |
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
|