Abstract
Synopsis The metasedimentary rocks of the Loch Laggan-Upper Strathspey area form part of the Grampian Division of the Caledonides in the Grampian Highlands. They comprise two lithostratigraphic successions, the Glenshirra and the Corrieyairack successions, which are separated by a zone of high strain, the Gairbeinn slide. Both successions consist dominantly of non-calcareous clastic metasediments. They may be correlated with similar lithostratigraphic units in the Loch Killen and the Corrieyairack Pass areas. The two successions share a similar deformational history and were both subjected to amphibolite facies metamorphism. A sub-horizontal foliation associated with an early isoclinal folding which is intensely developed in the vicinity of the Gairbeinn slide has been refolded by tight, upright, NE-SW trending folds, which have in turn been refolded by open folds with generally NW-SE trending axial traces. The absence of the Gairbeinn Pebbly Semi-psammite described from the Corrieyairack Pass area by Haselock et al. (1982) may be attributed either to tectonic excision during the sliding or to lateral facies variations.
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