Mesozoic sediments of the Capitan quadrangle, central Lincoln County, New Mexico, were altered by intrusions of diorite and diorite porphyry dikes and by displacement movements along some of the dikes. The apparent effects of the two processes extend laterally about 30 feet on either side from the dikes in the sandstones and 20 feet in the limestones and shales. Some of the outstanding changes in the sediments include induration, a change in color, formation of workable beds of coal, replacement of carbonates, and a variation in the mineral content.

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