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• Formation is exposed. This fossiliferous formation consists of brown <br />and grey sandstone, green share, and brown o'oTitic limestone. Further <br />downslope, the red, grey, and brown sandstone and silts tone and red, <br />grey, and green shales of the Wasatch and Ohio Creek Formations are <br />visible. Below this is the Hunter Canyon Formation, composed of buff <br />and grey massive cliff-forming sandstone and grey to greenish-grey shale. <br />The Mount Garfield Formation and Sego Sandstone underlie the Hunter Can- <br />yon; these sediments consist of buff and grey sandstone and grey shale, <br />with varying amounts of coal present. Bordering the East Salt Creek <br />drainage is the Mancos Shale, a dark grey to black soft shale with thin <br />sandstone beds at various horizons. Alluvial and eolian deposits are <br />common along drainages (Cashion 1973). <br />Soils <br />• Soils along the East Salt Creek drainage are of the Natrargids- <br />Haplargids-Camborthids association. They occur on mesas and benches and <br />are warm, deep and moderately deep, well-drained, gently sloping to <br />moderately steep soils (U.S.D.A. SCS 1972). <br />Just east of the drainage and extending up the cliffs, soils of the <br />Torriorthents-Rock outcrop association are found. These consist of warm, <br />shallow, well-drained, sloping to steep soils and rock outcrop on breaks <br />and canyons (ibid.). <br />Climate <br />A fairly arid, cool,"transition <br />area. Average annual precipitation <br />which occurs as snow. Temperatures <br />• mer to a low of -35° F. in winter. <br />to 90 days, the optimum growing sea <br />zone" climate prevails in the study <br />is 16-20 inches, at least half of <br />range from a high of 100° F. in sum- <br />There is a frost-free period of 50 <br />>on for native plants occurring from <br />7 <br />