Mount Barney is an igneous complex which has been emplaced in Carboniferous and Mesozoic sedimentary and volcanic country rock. Diorites, dolerites, granophyres, rhyolites, trachytes, and pyroclastics occur in ring dikes, cone sheets, sills, and other structures closely resembling ring complexes in Scotland. Five centers of activity have been recognized and are described. The age is given as post-Triassic to pre-Eocene-Oligocene.

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