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Book Chapter

The Stoer Group

Published:
January 01, 2002

Abstract

The Group consists of alluvial red sandstones, interspersed with lake sediments, having a maximum exposed thickness of 2 km. The present extent of the Stoer Group is shown in Plate 1. It has survived only as a narrow strip next to the Coigach fault, apparently in a hanging wall roll-over (Stewart 1993a). Figure 3 shows the Stoer Group truncated by the Coigach fault, together with its unconformable relations with the Lewisian gneiss complex beneath and the Torridon Group above. The original extent of the group can only be inferred from the sediments. It has not been identified in the subsurface offshore to the west and it is unlikely that it ever existed at the present level of erosion east of the existing outcrop.

The general outlines of the sedimentary history are clear, but problems lurk in the details. For example, the oldest sediments of the group occupy palaeovalleys eroded in the gneiss complex, some of which were filled exclusively by alluvial deposits whereas others hosted swamps and temporary lakes. Another controversial topic is the origin of the volcaniclastic Stac Fada Member, and the amount of volcanic input to Stoer Group sediments generally.

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Contents

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
Volume
24
ISBN electronic:
9781862393998
Publication date:
January 01, 2002

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