Chemical compositions of chlorite and sericite from one production well in the Roosevelt geothermal system have been determined by electron probe methods and compared with compositions of chlorite and sericite from porphyry copper deposits. Modern system sericite and chlorite occur over a depth interval of 2 km and a temperature interval of 250/sup 0/C.

This is a photogeologic map, scale 1:24,000, of the Colorado Plateau Area, Orange Cliffs-15, in Garfield and San Juan Counties, Utah.

This is a photogeologic map, scale 1:24,000, of the Colorado Plateau Area, Tidwell-15, Emery County, Utah.

From abstract: Elk Ridge is in southeastern Utah in the central part of San Juan County. It forms a conspicuous ridge on the north end of the Monument upwarp. During the summer of 1953 field work was largely restricted to South Elk Ridge, that part of Elk Ridge which is south of The Notch. Permian and Triassic sedimentary rocks crop out in the area and Jurassic and Cretaceous rocks are exposed east of the area.

Abstract: A reconnaissance for radioactive minerals in the Shinarump conglomerate of Triassic age exposed north of the San Juan River at Balanced Rock anticline was made in July 1953. The purpose of the reconnaissance was to search for any exposed uranium minerals and to determine the favorability of the Shinarump for accumulation of uranium-ore deposits. No uranium minerals or places of abnormally high radioactivity were observed. However, nine exposed channels at the base of the Shinarump conglomerate and other channels, probably present where the base of the Shinarump is concealed, indicate the Shinarump may be favorable for uranium-ore deposits.

This is a photogeologic map, scale 1:24,000, Emery-7, Emery County, Utah.

This is a photogeologic map, scale 1:24,000, Elk Ridge-2, in San Juan County, Utah.

This is a photogeologic map, scale 1:24,000, Bluff-3, in San Juan County, Utah.

This is a photogeologic map, scale 1:24,000, Bluff-11, in San Juan County, Utah.

This is a photogeologic map, scale 1:24,000, Straight Cliffs-3, in Kane County, Utah.

This is a photogeologic map, scale 1:24,000, Elk Ridge-14, in San Juan County, Utah.

This is a photogeologic map scale 1:24,000 of Elk Ridge-7 Quadrangle, San Juan County, Utah.

This is a photogeologic map scale 1:24,000 of Elk Ridge-15 Quadrangle, San Juan County, Utah.

This is a photogeologic map scale 1:24,000 White Canyon-2 Quadrangle, San Juan and Garfield Counties, Utah.

This is a photogeologic map scale 1:24,000 Tidwell-7 Quadrangle, Emery and Grand Counties, Utah.

This is a photogeologic map scale 1:24,000 of White Canyon-1 Quadrangle, San Juan and Garfield Counties, Utah.

This is a photogeologic map, scale 1:24,000, of the Colorado Plateau Area, MOAB-12, in Grand County, Utah.

Abstract: Napier Drilling Company of Dallas, Texas drilled 53,998.0 feet for exploration purposes, under Contract No. AT(05-1)-256. This footage was drilled in 508 holes during the period from June 21, 1954 through May 13, 1955.

Introduction: Studies of uranium-vanadium occurrences in the Four Corners region show that, with the exception of the Lukachuai area, all of the major deposits in the Morrison formation are grouped around the various igneous masses which are scattered irregularly throughout the Colorado Plateau. The pattern of deposition varies from mountain group to mountain group and each will be described separately. Maps accompany this report to supplement the descriptions of ore occurrences in the vicinity of the La Sal, Abajo, Carrizo, and Henry mountains. Elsewhere, it is believed that a written description will suffice.

From introduction: This study is part of the United States Department of Energy's National Uranium Resource Evaluation Program to understand the geologic setting, amount, and availability of uranium resources within the boundaries of the United States.

This report discusses upland erosion control, revegetation activities, and long-term maintenance plans for the Ruby Pipeline Project, a pipeline that extends from Wyoming to Oregon.

From introduction: This report summarizes the results of the USGS exploration in the Yellow Cat and Squaw Park areas, and contains a brief description of the geology and ore deposits

From abstract: Uranium deposits and radioactivity anomalies have been found in the eastern half of the area underlain by the Browns Park formation in northwestern Colorado, south-central Wyoming, and northeastern Utah. The deposits are in eolian, lacustrine, and fluvial sandstones, tuffaceous sandstones, and limestones all of which were deposited on two converging pediments during Miocene time. At least one eastern and one western facies of lacustrine and fluvial sedimentary rocks are separated by a belt of eolian sandstones. The faces may be distinguished in the field and by petrographic and heavy-mineral studies in the laboratory.

Report discussing the U.S. Geological Survey's reconnaissance for uraniferous carbonaceous materials in three areas of southern Utah: Kaiparowits Plateau, Henry Mountains, and Kolob Terrace.