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The 'Vhite Canyon area includes about 700 square miles in the west-central part of San Juan County and the eastern part of Garfield County, southeastern Utah, near the center of the Colorado Plateau province. It is bounded by 37°30'00" and 37°52'30" north latitude and by 110°00' and 110°30' west longitude. Sedimentary formations that range in age from Pennsylvanian to Jurassic crop out in the area. The rock units from oldest to youngest are the Hermosa formation of Pennsylvanian age; the Rico formation of Pennsylvanian and Permian ( ? ) age ; the Cedar Mesa sandstone member, the Organ Rock tongue, and the White Rim sandstone member of the Cutler formation of Permian age; the Hoskinnini member and the upper member of the Moenkopi formation of Triassic ( ? ) and Early and Middle ( ? ) Triassic age ; the Shinarump member, the mudstone-sandstone unit, the Moss Back member, the limy unit, and the sandstone-siltstone unit of the Chinle formation of Late Triassic-age; the Wingate sandstone, Kayenta formation, and Navajo -sandstone of the Glen Canyon group of Late Triassic and Jurassic age; and the -Carmel formation and Entrada sandstone of the San Rafael group of Early and Middle JuraSSiic age. The White Canyon area is on the west flank of the Monument upwarp, and strata have a regional dip of 2° to 3° westward. Low-amplitude flexures locally modify the regional dip of the. strata. Vertical and steeply dipping normal faults in the southwestern part of the area trend northeast, north, and northwest. In the northwestern part of the area, grabens and horsts are bounded by normal faults that trend mostly N. 60°-80° W., and dip 65° to vertical, but some trend N. 50°-60° E. 1.'he most conspicuous joints in the area are nearly vertical and trend N. 65° ,V., N. 35° E., N. 65° E., and north. Mineral deposits in the area are copper-uranium and copper deposits in the Shinarump member of the Chinle formation. Most of the uranium and copper is localized in mediumto coarse-grained and conglomeratic sandstone interbedded with mudstone that fills channels cut into the Moenkopi formation. Seventy-five channels were mapped-16 of them contain at least 1 uranium deposit having a grade of 0.10 percent or more Ua08. At least eight additional channels contain uraniferous material. Channels range in width from 30 to 1,000 feet and are as much as 50 feet deep. The principal uranium ore minerals are uraninite, uranophane, metatorbernite, phosphuranylite, metazeunerite, and a zippeitelike mineral. Minor quantities of uranopilite, johannite, meta-autunite, cuprosklodowskite, and becquerelite occur locally. The ore minerals replace fossil plant material, quartz, clay, and feldspar; fill fractures in quartz grains; and are· disseminated in sandstone. Primary sulfide minerals associated with the uranium minerals are pyrite,

Geology and ore deposits of the White Canyon area, San Juan and Garfield Counties, Utah