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
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