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<br /> <br />. <br /> <br />. <br /> <br />"". .... <br /> <br />"Geology of the Thomas Range fluorspar district. Juab County", <br />by M. H. staatz and F. W. Osterwald~ Bulletin 1069. Fluor- <br />spar deposits in the western part of Thomas Range occur in <br />pipes. veins and disseminated deposits, but only those in <br />pipes are economically important. The pipes are localized in <br />shatter zones adjacent to faults and intrusive breccia bodies, <br />and occur in dolomites. The fluorspar deposits contain <br />uranium with some samples containing as much as 0.33 percent <br />uranium. <br /> <br />"Coal resources of Colorado". by E. :R. Landes, Bulletin l072-C. <br />This is a part of the program to reappraise the coal resOUrces <br />of the United states. Coal~bearing:areas are shown ona map. <br />and coal reserves are listed by townshiP. rank of coal, thickness <br />of over-burden. and thickness of co~l beds. Brief geographic <br />and geologic description of each area are included. <br /> <br />"Areal geology of the Placerville q~adrangle". byA. L. Bush. <br />C. S. Bromfield. and C. T. Pierson. ,Bulletin 1072-E. Sedi- <br />mentary rocks ranging from Permian to Cretaceous in age occur <br />in a broad, northwest-trending syncline and a subsidiary dome; <br />these are cut by three systems of normal faults. Dioritic sills <br />occur at the southeastern corner of the quadrangle. Tabular <br />mineral deposits in the Entrada sandstone contain vanadium and <br />subordinate uranium. and form a nearly continuous elongate layer <br />exposed over a distancB of 2~ miles; <br /> <br />"Geology of uranium deposits in Triassic rocks of the Colorado <br />Plateau region" > by W.E. Finch. Bulletin 1074-D. These de- <br />posits are an important domestic source of uranium, second only <br />to those in rocks of Jurassic age. The report describes three <br />mineral belts that contain most of the large deposits. nearly <br />all in the Shinarump and Moss Back members of the Chinle for- <br />mation. The deposits are illustrated in t ext and maps and com- <br />pared with the Jurassic deposits. <br /> <br />-2- <br />