The geology of Oklahoma was formed through millions of years when rocks that represent each geologic time period were deposited. Sedimentary rocks dominate exposures across the State, with major areas of igneous-rock outcrops located in the Arbuckle and Wichita Mountains of south-central and southwestern Oklahoma. (Map modified by T. Wayne Furr, after Branson and Johnson; WWW version by Jim Anderson.)

Left side of above map for printing

Right side of above map for printing

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