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<br />2.0 GENERAL FEATURES <br />2.1 Geology <br /> <br />ROCKS RANGING IN AGE FROM PALEOZOIC TO <br />CENOZOIC ARE EXPOSED IN BASIN <br /> <br />Paleozoic rocks are found mainly in the eastern part of the basin, <br />Mesozoic rocks in the eastern and central part, and <br />Tertiary rocks throughout the basin. <br /> <br />A general i zed geo 1 ogi c map of the Whi te Ri ver bas in is shown in fi g- <br />ure 2.1-1. Rock outcrops in the basin range in age from the Pennsylvanian <br />Peri'od of the Paleozoic era to the Tertiary Period of the Cenozoic Era. <br /> <br />Pal eozoi c rocks are compri sed of Permi an and Pennsyl vani an sedimentary <br />rocks. These rocks are exposed in the eastern and north-central part of the <br />basin. Mesozoic sedimentary rocks include the Mesaverde Group and Mancos <br />Sha 1 e of Cretaceous age. Coa 1 depos i ts are found in the Mesaverde Group. <br />Other Mesozoic rocks consist of Cretaceous, Jurassic, and Triassic sedimentary <br />rocks. Mesozoi c rocks are exposed in the eastern and central part of the <br />basin. <br /> <br />The pri ncipa 1 sedimentary formations of Tertiary age are the Wasatch, <br />Green River, and Uinta Formations. These rocks occur in the central and <br />western part of the basin. Rich oil-shale deposits are found in the Green <br />River Formation of Utah and Colorado. Other Tertiary rocks consisting of <br />basalt and mixed tuff and breccia also occur in the extreme eastern part of <br />the basin. <br /> <br />8 <br />