Abstract

The Moine and Lewisian rocks of Morar and Knoydart on the west coast of Scotland have been involved in at least three major deformation phases. The earliest folds, in which Lewisian rocks form the cores of anticlines, and the youngest Moine formation the cores of synclines, are perfectly isoclinal. The second phase has produced a major recumbent fold, essentially a westward closing antiform, which refolds the previous structural succession. This recumbent fold, which is termed the Knoydart Fold, is underlain by a clearly recognized slide of approximately the same age which is called the Knoydart Slide.

It is proposed that the axial plane of the Knoydart Fold is cut at a small angle by the slide, so that the fold and its closure have two main outcrops, one below the slide in the west and another above the slide in the east. The whole assemblage is finally refolded into the more open Morar Antiform in the west and the Ben Sgriol Synform in the east. The proposed structure implies that the Lewisian outcrops around the Morar Antiform are on the lower limb of the Knoydart Fold and root eastwards. These rocks may be traced round the hinge of Knoydart Fold and are represented on the upper limb by the Lewisian in east Morar, which consequently roots westwards.

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