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• Included in this unit is about 5% Pinon soils. <br /> Rock Outcrop consists of barren escarpments, ridge caps and points <br /> of sandstone which generally occupy positions higher on the slope. The <br /> escarpments are two to forty feet thick and twenty to 2,500 ft. long. <br /> 901 - Borolls/Rock Outcrop, Complex, 40% to 90% Slopes . <br /> This map unit is on side slopes of canyons and mesas. Areas are <br /> irregular in shape and are 40 to 2,000 acres in size. The native vegetation <br /> is mainly Pinyon Pine and Douglas fir trees with an understory of Gambel <br /> oak, Utah serviceberry, western wheatgrass, prairie junegrass, Indian <br /> ricegrass, and elk sedge. Elevation is 6,600 to 9,200 ft. The average <br /> annual precipitation is fifteen to twenty-two inches, the average annual <br /> • air temperature is 380-420F, and the average frost-free period is 65-110 days. <br /> This unit is 45% Borolls, and 40% Rock Outcrop. The components <br /> of this unit are so intricately intermingled that it was not practical <br /> to map them separately at the scale used. <br /> Included in this unit are about 10% Ceek soils and 5% Specie soils. <br /> The Borolls are shallow to deep and well-drained. They formed in <br /> residuum and colluvium derived dominantly from sandstone and shale. <br /> Borolls are highly variable.. No single profile of Borolls is typical , <br /> but one commonly observed in the survey area has a surface layer of dark <br /> grayish brown stony loam about ten inches thick. The upper three inches <br /> of the subsoil is brown stony sandy clay loam. The next twenty-two inches <br /> • is brown very cobbly clay loam and clay. The lower part to a depth of <br /> sixty inches or more is brown very gravelly clay. <br /> -19- <br />