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~~3 ~ ~b) - <br />FxG .~. 1 2 i l 36 <br />76--Pinon-Bowdish-Rock outcrop complex, 3 to 30 percent slopes. <br />this map unit .is on mesas, benches, and escarpments. The native <br />vegetation is mainly pinyon pine and Utah uuniper. Elevation is 5,400 <br />to 6,800 feet. The average annual precipitation is 10 to 14 inches, <br />the average annual air temperature is 46 to 48 degrees F, and the <br />.average frost-free period is 110 to 130 days. <br />This unit is 30 percent Pinon loam, 25 percent Bowdish loam, and <br />'/.5 percent Rock outcrop. The Bowdish soil occurs where the sagebrush <br />and grass understory are thicker. Rock outcrop makes up as much as 35 <br />to 40 percent of some mapped areas <br />The components of this unit are <br />so intricately intermingled that it was not practical to map them <br />~;eparately at the scale used. <br />Included in this unit i5 about 5 percent Progresso soils occurring <br />under more open grass-shrub areas, 5 percent soils that are similar to <br />these Pinon and Bowdish soils but have greater than 35 percent rock <br />fragments in the control section, 5 percent soils that are similar to <br />these Pinon and Bowdish soils but lack a calcic horizon, and S percent <br />variable Ustic Torriorthents occurring in areas ~•~ith thicker <br />understory. Also included are small areas of Barx soils and Paradox <br />soils occurring on alluvial fans. <br />The Pinon soil is shallow and well drained. It formed in residuum <br />~;erived dominantly from interbedded sandstone and shale. Typically, <br />the surface layer is brown loam about 5 inches thick. The underlying <br />~~~:aterial to a depth of 16 inches is pinkish white foam. Hard <br />sandstone is at a depth of 16 inches. In some areas the surface layer <br />is gravelly loam, gravelly sandy loam, sandy loam, or cobbly loam. <br />/~ zy~ <br />~/ ~... <br />