Abstract
In the North West Highlands of Scotland a gneissic basement (Lewisian) and unconformable cover of Cambrian sediments can be traced from an undeformed foreland through successive Caledonian nappes, where deformation and metamorphism increase progressively. A special study of the geometric relations of the two formations on either side of the basementcover unconformity is presented. Fold limbs in cover rocks can be traced into the Caledonized Lewisian gneiss, where they are homologues of domains within ductile shear zones. The axial directions of Caledonian folds in cover and basement are quite different, even though they were formed at the same time, these orientations being governed by the pre-orogenic orientations of the respective formations before Caledonian deformation. The Moine thrust zone, with its complex major thrusts and smallscale imbricate structures, appears to have developed later than the folding and ductile shear zone events.
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