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12 Included with this soil in mapping are some areas where slopes are more than 30 percent and others where they are less than 5 percent; small areas of Youman and Passar soils; and some areas where this Cochetopa soil is underlain by sandstone and has redder subsoil than the one described in the represen- tative poofile. Included soils make up about 10 percent of the total acreage. Nearly all the acreage is native range and is used for grazing in summer and fall. Runoff is medium to r¢pid, depending on slope. The erosion hazard is moderate. Capabil- ity units VIe-1 irrigated, VIe-4 nonirrigated; Sub alpine Loam range site." II I' I1 i~ I, I' I1 Il_ t i~ The following information regarding the Nutras Series has been taken from Hunter and Spears (1975) ~s "The Nutras series consists of deep, well-drained soils on ridgetops, mesas, and basalt flows. Slopes are 10 to 50 percent. These soils formed in stony material derived from latite basalt, which is resistant to weathering. Typically, these soils have a I~-inch mat of undecomposed and partly decomposed needles, bark, and twigs. In a representative profile the mineral surface layer is white stony loam about 9 inches thick. The subsurface layer is about 6 inches of mixed pinkish-gray and reddish-brown stony clay loam. The subsoil is reddish-brown extremely stony clay about 25 inches thick. The substratum to a depth of 60 inches is reddish-brown extremely stony clay. Nutras soils are at elevations of 10,000 to 11,500 feet. The annual precipitation is more than 20 inches. The average annual soil temperature is 30~F. The native vegetation is commonly Engelmann spruce, sub al pine fir, and scattered aspen. The understory is Fendler bluegrass, spike trisetum, russet buffaloberry, mountain birch, and alder. Permeability is slow, and available water capacity is moderate. Roots can penetrate to a depth of 60 inches or rtiore. These soils are used chiefly for woodland, widllife, and watershed. Representative profile of Nutras stony loam, 10 to 50 percent slopes, in a wooded area east of Powderhorn Creek; N1/2 sec. 33, T. 45 N., R.2., Elinsdale County: Ol-4 inches to 0, undecomposed organic material grading to partially decomposed material, chiefly needles, bark, and twigs. A2-0 to 9 inches, white (lOYR 8/?_) stony loam, very pale brown (lOYR 7/3) moist; moderate, thin, platy structure parting to moderate, very fine, granu]ar; soft, very friable; about 30 percent stones, cobblestones, and gravel; pli 5.4; gradual, smooth boundary.