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12/88 <br />77--P~nan-Progresso looms, 3 to 12 percent slopes. This map unit <br />is on upland hills and ridges. The native vegetation is mainly pinyon <br />pine, Utah juniper, grasses, and shrubs. Elevation is 5,500 to b',800 <br />feet. The average annual precipitation is 12 to 14 inches, the <br />.average annual air temperature is 46 to 48 degrees F, and the average <br />frost-free period ~s 110 to 130 days. <br />This unit is 55 percent Pinon loam and 30 percent Progresso loam. <br />The Pinon soil occurs under pinyon-juniper and the Progresso soil <br />nccurs under grasses and shrubs. The components of this unit are so <br />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 Barx soils occurring <br />~,nder grasses and shrubs, 5 percent Rock outcrop, and 5 percent Ustic <br />Torriorthents. <br />The Pinon soil is shallow and well drained. It formed in residuum <br />derived dominantly from interbedded sandstone and shale. Typically, <br />the surface layer is brown loam about 5 inches thick. The underlying <br />material to a depth of 16 inches is pinkish white loam. Hard <br />sandstone is at a depth of 16 inches. In some areas the surface layer <br />is gravelly loam, cobbly loam, sandy loam, or gravelly sandy loam. <br />Permeability of the Pinon soil .is moderate. Available water <br />rapacity is vary low. Effective rooting depth is 10 to 20 inches. <br />Runoff is medium, and the hazard of water erosion is high. <br />The Progresso soil is moderately deep and well drained. It formed <br />in alluvium derived dominantly from sandstone. Typically, the surface <br />Layer is reddish brown loam 7 inches thick. The subsoil is reddish <br />brown clay loam 17 inches thick. The substratum is white sandy loam <br />12 inches thick. Hard sandstone is at a depth of 36 inches. In some <br />areas the surface layer is fine sandy loam. <br />3 00 <br />