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Published online by Cambridge University Press: 01 May 2009
It is shown that “Hutton's Unconformity” on the Isle of Arran has been misinterpreted. The assumed plane of unconformity is in reality the plane separating the Dalradian schists from the upper-most zone of schists impregnated with and cemented by calcareous material. The true plane of unconformity is situated some 4 feet above this plane.