Proterozoic folds on the Northwest Caledonian Foreland

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Abstract
Synopsis: Recent isotopic studies have shown that parts of the Moine sedimentary sequence underwent orogenic metamorphism before 1000 Ma and this raises doubts as to the significance of the c. 730 Ma ‘Morarian’ ages yielded by pegmatites from the Moine tract. From evidence readily available from Geological Survey publications we show that the Torridonian rocks of the NW Caledonian foreland were folded and eroded in Precambrian time. This folding was coeval with emplacement of the Morarian pegmatites, supporting the view that the Morarian was a tectonothermal event of regional importance, and permitting (but not establishing) the stratigraphic equivalence of the Upper Torridonian with the Moine rocks in western Sutherland.

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