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<br />012111 <br /> <br />located on the south side of the river, and confined to the interval <br /> <br />from below (downstream from) Little Hole to above the mouth of Jarvis <br /> <br />Canyon. ' <br /> <br />Phosphate <br /> <br />Phosphate rock crops out as a minor stringer on the north flank of <br /> <br />Split ~IDuntain, but to the northwest, in the Brush Creek area, deposits <br /> <br />are up to 22 feet (6.7 m) thick. These deposits north of Vernal are a <br /> <br />major national resource and are under development. 30 <br /> <br />Permian age phosphate deposits are found in the vicinity of the <br /> <br />township line between T 2 and 3 N, R 20 E. Samples taken in the area <br /> <br />were analyzed by the Bureau of Mines, and results showed an overall <br /> <br />average of 12.4 percent P205, or almost half the grade considered as the <br /> <br />lower limit of medium grade.31Low grade of that deposit plus the great <br /> <br />t~ickness of overburden indicate future development is remote. <br /> <br />Barite <br /> <br />A small occurrence of barite has been noted in mf~SW~sec 33, <br /> <br />T 3 N, R 25 E, about 3 miles (5 km) north of the Green River in the Red <br /> <br />Creek Quartzite. This small deposit "suggests by implication that <br /> <br />similar and perhaps larger deposits may occur elsewhere in the area."32 <br /> <br />30Unfermann, G. E., and B. R. Untermann. A Popular Guide to the Geology <br /> <br />of Dinosaur National Monument. Dinosaur Nature Assoc., 1969, pp. 118-119. <br /> <br />31Hansen, W. R. The Geology of the FIaming Gorge Area, Utah-Colorado- <br /> <br />. <br />Wyoming. U.S. Geol. Survey Prof. Paper 490, 1965, pp. 184-185. <br /> <br />32Hansen, W. R. The Geology of the Flaming Gorge Area, Utah-Colorado- <br /> <br />Wyoming, U.S. Geol. Survey Prof. Paper 490, 1965, p. 185. <br /> <br />'18 <br /> <br />I <br /> <br />I <br /> <br />,-- <br />