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<br />In a representative profile the surface layer is dark-gray
<br />loam about 4 inches thick. The subsoil is dark-gray light clay
<br />loam and very dark grayish-brown and brown gravelly clay and
<br />sandy clay about 41 inches thick. The substratum to a depth of
<br />60 inches is light-brown stony clay loam.
<br />Cochetopa soils are at elevations of 9,000 to 10,000 feet.
<br />The climate is cold, and the average annual soil temperature is
<br />about 39~F. The annual precipitation is about ].8 inches.
<br />Permeability is slow. Roots can penetrate to a depth of
<br />60 inches or more, and available water capacity is high.
<br />Almost all the acreage is used for range. A few small areas
<br />are used for irrigated hay and pasture.
<br />Representative profile of Cochetopa loam, 5 to 30 percent
<br />slopes; sec. 22, T. 15 S., R. 86 W., Gunnison County:
<br />Al-0 to 4 inches, dark-gray (lOYR 4/1) loam, black (lOYR 2/1)
<br />moist; moderate, very fine, granular structure; soft,
<br />very friable; about 10 percent angular coarse frag-
<br />ments; pH 6.8; clear, smooth boundary.
<br />Bl-4 to 12 inches, dark-gray (lOYR 4/1) light clay loam,
<br />black (lOYR 2/1) moist; moderate, fine, subangular
<br />blocky structure parting to moderate, fine, granular;
<br />slightly hard, friable; 10 percent angular coarse
<br />fragments; pH 6.8; clear, smooth boundary.
<br />B21t-12 to 18 inches, very dark grayish brown (lOYR 3/2)
<br />gravelly clay, very dark brown (lOYR 2/2) moist;
<br />strong, medium to fine, subangular blocky structure;
<br />very hard, firm, thin, continuous clay films on ped
<br />faces; 15 percent angular coarse fragments; pH 6.8;
<br />clear, smooth boundary.
<br />B22t-18 to 32 inches, brown (7.5YR 5/4) gravelly clay,
<br />dark brown (7f5YR 4J4) moist; strong, medium,
<br />angular blocky structure parting to strong, fine
<br />angular blocky; very hard, firm; thin continuous
<br />clay films; 15 percent coarse fragments; pH 7.2;
<br />gradual, smooth boundary.
<br />B3-32 to 45 inches, brown (7.5YR 5/4) sandy clay, dark
<br />brown (7.5 YR 4/4) when moist; 10 percent angular
<br />coarse gragments; moderate, fine to medium, sub-
<br />angular blocky structure; very hard when dry,
<br />firm when moist; thin patchy clay films on ped
<br />faces; pH 7.6; gradual, smooth boundary.
<br />C-45 to 60 inches, light brown (7.5YR 6/4) stony clay
<br />loam, brown (7.SYR 5/4) when moist; massive hard
<br />when dxy, friable when moist; 30 percent coarse
<br />fragments; pH 7.6.
<br />The Al horizon is typically loam, but in places is
<br />gravelly and stony loam. It ranges from dark gray to
<br />dark brown. The content of coarse gragments generally
<br />ranges from 5 to 20 percent in the upper part of the
<br />profile, but is as high as 35 percent in the C horizon.
<br />Cochetopa loam, 5 to 30 percent slopes (CoF,).-This soil
<br />is mainly in the Crested Butte-Almont part of the survey ax•ea.
<br />At the higher elevations the :~urfncc layer is 12 to 20 inches
<br />thick.
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