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<br /> <br />Group t': Soils of Cold Humid SubalPine and .4Zpine Regions <br />(LIGHT GREEN) <br /> <br />This group. which only occupies four percent of the basin, is con- <br />fined to the high mountains of Colorado. <br /> <br />Mean annual precipitation is the highest for the basin and ranges <br />from 30 to 50 inches. There is usually a frost every month. Ele- <br />vations range from 10.000 to 13.000 feet. and there is a mean <br />annual temperature of 25 to 420 F. <br /> <br />Subalpine Forest and Alpine cover types dominate the rugged moun- <br />tains and windswept peaks characteristic of this group. Slopes <br />are steep, usually 10 to 80 percent in gradient. <br /> <br />Sedimentary and igneous rocks, colluvium, and till are the principal <br />materials in which the soils have formed. Most of the soils are <br />shallow or moderately deep and rock outcrop may occupy as much as <br />30 percent of a delineation. <br /> <br />Map unit 27 includes all of these soils. Great Groups are princi- <br />pally Cryorthents, Cryochrepts, and Cryorthods. <br /> <br /> <br />'IIi <br /> <br />~- <br />I <br /> <br />j <br /> <br />Soils Group V Near Si1verton, Colorado <br /> <br />H. 'M~'O <br /> <br />111-19 <br /> <br />