Dr. G ILBERT WILSON said how pleased he was to learn from this,and the accompanying paper read by Dr M. R. W. Johnson, thatearly phases in the deformation of the Moine Series could nowbe considered Precambrian in age. Twenty or thirty years agosuch a view was held by perhaps three or four heretical workersin the Highlands; but most geologists in those days followedPeach and Bailey in confining the deformation and metamorphismof these rocks to the post Cambrian, Caledonian diastrophism.This was particularly so in Inverness-shire and Wester Ross,where the trends of the Moinian structures are roughly parallelto the strike of the Moine Thrust Zone. Further north in Sutherland,as Coles Phillips (Q.J.G.S.,93, p. 581, 1937) showed, the tectonictrends form a crescentic pattern which is convex to the NE,and gradually swings through SE and ESE until a dominantly easterlydirection and sense of plunge are achieved in the area of A'Mhoine.There the linear structures such as rods and mullions, are parallelto the axes of asymmetrical, overturned and recumbent reclinedfolds. This means that the roughly north–south trend-linesshown on Dr Powell's and other maps of this northern area representthe strikes of the bedding of recumbent fold-limbs and not theaxial trends of the prevalent tectonic structures, though theseare disrupted by some late folding and faulting accompaniedby retrograde metamorphism, which trend parallel to the strikeof the Moine Thrust. The easterly trends in North Sutherland
...
This 250-word extract was created in the absence of an abstract.
