Superimposed folding at Loch Monar, Inverness-Shire and Ross-Shire

Summary A sequence of rock types of over 20,000 feet in thickness has been established. Within this succession, rocks originally regarded as inliers of Lewisian Gneiss appear at four horizons ; the author believes them to be in integral part of the Moine Series. The major folds were formed during two separate episodes of movement. The first major folds have E.-W. trending, southerly dipping axial planes and plunge at low angles to the west. A second set of major folds with NE.-SW. trending, south-easterly dipping axial planes were superimposed upon the earlier folds,refolding the limbs and axial planes of the first folds and distorting the early fold axes and minor structures. Gently dipping first-fold limbs were refolded into gently southwesterly plunging second folds, and steeply dipping first-fold limbs were refolded into steeply or vertically plunging major second folds. During the second folding there was some regeneration of folding about the first-fold axes. The microfabric of the metamorphic rocks shows cross-girdles of quartz c-axes and of biotite 001-plane poles.