| Computer Code: |
TBS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Fine-grained green-grey to buff-weathering sandstone; minor mudstone. |
| Definition of Lower Boundary: |
Conformable upon Loch na Dal formation (TBLN). Incoming of cross-bedded sandstone without mudstone. |
| Definition of Upper Boundary: |
Conformable overlain by Kinloch Formation (TBK). Incoming of fining-upwards cycles of sandstone-siltstone. |
| Thickness: |
c. 1100 m. |
| Geographical Limits: |
Northwest Scotland: Isle of Skye; Sleat to Kishorn. |
| Parent Unit: |
Sleat Group (TB)
|
| Previous Name(s): |
Beinn Na Seamraig Grits [Obsolete Name and Code: Use TBS]
(-3717)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Beinn Bhreac to All a’ Choin, Sleat, Skye [NG 721 162 to NG 708 189]. |
| Reference Section |
Kylerhea Glen, [NG 762 206 to NG 742 213]. |
| Reference(s): |
| Stewart, A D. 2002. The later Proterozoic Torridonian rocks of Scotland: their sedimentology, geochemistry and origin. Geological Society Memoir. Vol. 24. (The Geological Society.) |
| 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. |
| Krabbendam, M, Bonsor, H, Horstwood, M S, and Rivers, T. 2017. Tracking the evolution of the Grenvillian foreland basin: Constraints from sedimentology and detrital zircon and rutile in the Sleat and Torridon groups, Scotland. Precambrian Research, Vol. 295, 67-89. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S071
S071
S061
|
