Abstract
Synopsis Several narrow, lenticular belts of black cherty mudstone and siltstone (the Moffat Shales), alternating with thick greywacke sequences, strike NE–SW across Galloway. One such belt is hornfelsed and considerably broadened near the SW margin of the Loch Doon granitic pluton. The broadening is caused by the interference of a major reclined fold (F 2 ) with axis plunging SE, and earlier structures (F 1 ) associated with a melange-like fabric. A third set of open folds (F 3 ) with axes plunging steeply south is thought to have formed in response to the intrusion of the Loch Doon pluton. Major sinistral strike faulting followed by minor conjugate NW–SE and NNE–SSW faulting occurred between the F 2 and F 3 fold episodes. A dioritic dyke swarm can be divided on structural evidence into four intrusive phases; pre-F 2 and probably pre-F 1 , post-F 2 but pre-faulting, post-faulting but probably pre-F 3 , and post-F 3 .
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