| Computer Code: |
TCAR |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Coarse, red sandstone with trough crossbedding at base, followed by medium-fine grey, tabular sandstone with ripple cross-lamination, and very thin grey, shaley siltstone units. |
| Definition of Lower Boundary: |
Unconformable upon Lewisian Gneiss (L) or overlying the Diabaig Formation (TCD) with a sharp contact. |
| Definition of Upper Boundary: |
Conformably overlain by the remainder of the Applecross Formation (TCA). |
| Thickness: |
c. 50-100 m. |
| Geographical Limits: |
NW Highlands: Assynt-Rubha Coigach area - Loch Broom. |
| Parent Unit: |
Applecross Formation (TCA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Rubha Dubh Ard, 5 km SE of Achiltibuie, [NC 042 037 - NC 045 035]. |
| 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. |
| Nicholson, P G. 1993. A basin reappraisal of the Proterozoic Torridon Group, northwest Scotland. 183-202 in Tectonic Controls and Signatures in Sedimentary Successions. Frostick, L, and Steel, R (eds). Special Publication of the International Association of Sedimentologists, 20. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S101
|
