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<br />001585 <br /> <br />Recreation, timbering, water yield, and grazing are major uses <br />made of these soils which. are essentially all within the national <br />forest. There is no potential for irrigation. <br /> <br />Group VI: Land Types and Shallow Soils <br />(ORANGE) <br /> <br />This is the largest group as it covers 42 percent of the basin and, <br />there is a vast acreage in each state. All of the soils are within <br />map unit 28. <br /> <br />Precipitation ranges from 6 to 16 inches annually and there is a <br />frost-free period of 100 to 170 days. Elevations are between 4,000 <br />and 7,500 feet and the mean annual temperature is 42 to 540 F. <br /> <br />Grass and Pinyon-juniper are the common cover types. Characteris- <br />tically, vegetative cover is sparse and there are many barren areas. <br /> <br />Deep sandstone canyons, steep slopes bordering drainageways, <br />outcrops and badlands are prominent features of this group. <br />are extremely variable, ranging from 0 to 75 percent. <br /> <br />rock <br />Slopes <br /> <br />Sandstone, shale, and colluvial deposits are the principal parent <br />materials, and the soils are shallow. Narrow bands of deep alluvial <br />soils along drainageways are inclusions. <br /> <br />Grazing is the principal use of these soils although spectacular <br />scenic views are a definite recreational asset. The irrigation <br />potential is restricted to minor acreages of scattered alluvial <br />soil s. <br /> <br />I II -20 <br />