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1 Z/,38 <br />76--Pinon-Bowdish-Rock outcrop complex, 3 to 30 percent slopes. <br />fh~s map unit is on mesas, benches, and escarpments. The native <br />vegetation is mainly pinyon pine and Utah juniper. Elevation is 5,400 <br />r.o 5,800 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 />'l.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. The components of this unit are <br />so intricately intermingled that it was not practical to map them <br />•separately at the scale used. <br />Included in this unit is about 5 percent Progresso soils occurring <br />~~~der 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 5 percent <br />variable Ustic Torriorthents occurring rn areas with 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 rn residuum <br />~ferived dominantly from interbedded sandstone and shale. Typically, <br />the surface layer is brown loam about 5 inches thick. The underlying <br />~riaterial to a depth of 16 inches is pinkish white loam. Hard <br />sandstone rs 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 />zti~ <br />