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<br />Excess alkali severely limits cropland potentials. Soil blowing, dusti- <br />ness, corrosivity are limitations to non-agricultural uses. Half the <br />area is limited by high shrink swell and. low strength of the soils. <br /> <br />Map Unit 19 - Typic Calciorthids, skeletal--Borollic Calciorthids, <br />loamy; nearly level and sloping. <br /> <br />This map unit constitutes 1.0 percent of the basin. The soils in this <br />unit occupy alluvial fans and valley sideslopes. The soils are formed <br />in calcareous alluvial fan sediment principally from basalt and soft <br />sedimentary rocks. <br /> <br />Elevations range from about 8,000 to 8,500 feet (2,438 to 2,591 m). <br />Slopes range from 0 to 15 percent. The average annual precipitation <br />ranges from 10 to 15 inches (0.25 to 0.38 m). The mean annual soil <br />temperature is about 40 to 45 degrees F. (4.4 to 7.20 C) and the frost <br />free season is approximately 80 days. This .map unit covers about <br />47,000 acres (19,021 ha) - 73 square miles (189 km2). <br /> <br />This map unit is used almost entirely as rangeland. Native vegetation <br />is dominated by winterfat, fourwing saltbush, fringed sage, Indian <br />ricegrass and blue grama. <br /> <br />Dry cold climate, shallow soils and excess lime are limitations to use <br />as cropland. Dustiness, depth to rock, piping hazard, and low strength <br />are limitations to non-agricultural uses. Some areas also have excess <br />s.lope. <br /> <br />Map Unit 22 - Borollic lithic Camborthids, skeletal--Rock Outcrop; <br />gently sloping to steep. <br /> <br />This map unit constitutes 2.A percent of the basin. The soils occupy <br />mesas, alluvial fans and sideslopes. The soils are formed in materials <br />weathered residually from basalt and In calcareous alluvium from soft <br />sedimentany rocks. <br /> <br />Elevations range from 7,800 to 9,000 feet (2,377 to 2,743 m). Slopes <br />range from 2 to 30 percent except where rock outcrop occurs and here <br />almost vertical cliffs may occur. The average annual precipitation <br />ranges from 10 to 15 inches (0.25 to 0.38 m). The mean annual soil <br />temperature is about 40 to 45 degrees F. (4.4 to 7.20 C) and the frost <br />free season is approximately 70 to 100 days. This map unit covers about <br />118,000 acres (47,755 ha) - 184 square miles (477 km2). <br /> <br />This map unit is used for rangeland but also receives some grazing by <br />deer. Nathe vegetation is a sparse stand of winterfat, rabbitbrush, <br />saltbush, blue grama and Indian ricegrass. <br /> <br />Depth to rock, stoniness and slope are limiting all uses. <br /> <br />Group III - (Yellow) This group consists of two map units: 27 and 43. <br /> <br />'0"- <br />..' <br />~ <br /> <br />," ~!t 'r"\ <br />.. .l.J <br /> <br />A-7 <br />