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The Torridon Group

January 01, 2002


The group unconformably overlies both the Lewisian gneiss complex and the Stoer Group, and is in turn unconformably overlain by the Lower Cambrian (Figs 2 & 22). The unconformity surface at the base is generally rugged, with relief reaching 600 m. The maximum thickness of the Torridon Group is about 7 km onshore and 6 km offshore in the Sea of the Hebrides basin (Stein 1988, fig. 11; 1992, fig. 2B), but albitization of the highest beds indicates that the original thickness was 3–4 km greater. Lake deposits at the bottom of the group occupying palaeovalleys in the gneiss are followed by kilometres of red sandstones, all deposited in a subsiding rift. Alluvial sands interfinger with lake sediments to form cyclothems at the top of the group. As mentioned in the Introduction the Torridon Group is by far the most extensive and voluminous part of the Torridonian (see Plate 1), but nevertheless poses fewer problems of interpretation than the Stoer and Sleat Groups.

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Geological Society, London, Memoirs

The Later Proterozoic Torridonian Rocks of Scotland: their Sedimentology, Geochemistry and Origin

A. D. Stewart
A. D. Stewart
Postgraduate Research Institute for Sedimentology, University of Reading, PO Box 227,Reading RG6 6AB, UK
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Geological Society of London
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January 01, 2002




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