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are Fine, Montmorillonitic Aridic Argiborolls. These soils make <br />• up 15 percent of this unit and are sparesely vegetated by scattered <br />pinyon and juniper trees. <br />MAPPING UNIT RLX - TORRIORTHENTS <br />ROCK OUTCROP COMPLEX, STEEP <br />This broadly defined unit consists of exposed sandstone and shale <br />bedrock and stony soils that are shallow to moderately deep over <br />sandstone and shale and stony basaltic alluvium. Areas of this <br />complex occur throughout the survey area. The soils and outcrops <br />are moderately steep to very steep with slopes ranging from 15 <br />to 70 percent. <br />Torriorthents make up about 60 percent of this complex, and Rock <br />• Outcrop makes up 25 percent. The Torriorthents are on foothills <br />and mountainsides below the Rocky Outcrop. <br />Torriorthents are generally clayey to loamy and contain variable <br />amounts of gravel, cobbles and stones. The surface is normally <br />covered with stones weathered from the higher-lying Rock Outcrop. <br />South of the Colorado River, stones and cobbles of basalt are <br />on the surface. <br />The Rock Outcrop is mainly Mesa Verde sandstone and Wasatch shale. <br />Some areas are covered with basaltic boulders and stones. <br />Small areas of limestone outcrops and exposed gypsum are in the <br />eastern part of the survey area. <br />L <br />I-17 <br />