| Computer Code: |
TCCW |
Preferred Map Code: |
TCCW |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Pebble and cobble conglomerates and very coarse to coarse sandstone, in beds < 4 m thick. The sandstone shows channels, planar and trough-cross bedding, with co-sets several metres thick, and is locally contorted. |
| Definition of Lower Boundary: |
Unconformable upon Lewisian Gneiss (L). Precambrian weathering profile occurs locally just below the unconformity. |
| Definition of Upper Boundary: |
Conformably overlain by the remainder of the Applecross Formation (TCA). |
| Thickness: |
c. 450 m; thinning to the south. |
| Geographical Limits: |
NW Highlands: Cape Wrath to northern Assynt. |
| Parent Unit: |
Applecross Formation (TCA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Stewart, A D and Donnellan, N C B, 1992. Geochemistry and provenance of red sandstones in the Upper Proterozoic Torridon Group in Scotland. Scottish Journal of Geology, Vol.28, 143-53. |
| 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. |
| Williams, G E. 2001. Neoproterozoic (Torridonian) alluvial fan succession, northwest Scotland, and its tectonic setting and provenance. Geological Magazine, Vol. 138, 161-184. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S113
S114
|
