| Computer Code: |
TCBL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Grey mudstone, micaceous siltstone, coarse sandstone, thick-bedded 'graywacke' sandstone; medium-coarse, thick-bedded sandstone. |
| Definition of Lower Boundary: |
In part conformable upon Torran Member (TCTN); in part Unconformable upon Lewisian Gneiss (L). |
| Definition of Upper Boundary: |
Conformably overlain by Loch An Uach Member (TCLU) - Applecross Formation (TCA). |
| Thickness: |
c. 130 m. |
| Geographical Limits: |
Inner Hebrides: Raasay, Scalpay. |
| Parent Unit: |
Diabaig Formation (TCD)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Brochel, Raasay: [NG 585 463 to NG 584 459]. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S081
|
