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<br />CR- -Ustic Tori'Sorthcnts bouldery-Rock Outcrop complex, 35 to 100 <br />• percent slopes <br />This map unit is on mountainsides. The native vegetation is <br />mainly pinyon and juniper. Elevation is 6,400 to 8,500 feet. Elevations <br />below about 6,800 feet are limited to narrow areas along the Arkansas <br />River. The average annual precipitation is about 11 to 15 inches. The <br />annual air temperature is 43 to 47 degrees F, and the average frost- <br />free season is 95 to 120 days. <br />This unit is generally about 55 percent Ustic Torriorthents and <br />about 30 percent-Rock outcrop.-- Rock outcrop varies from .30~to 60 percent, <br />ho4ever. The Ustic Torriorthents and Rock outcrop are intermingled on <br />side slopes. <br />Included in this unit is about 5 percent Goslin gravelly sandy loam <br />and 5 percent Brownsto very gravelly loam on foot slopes and below Rock <br />ledges and cliffs.- Goslin soil is deep with less gravel. Browns to <br />soils are deep. Small areas of Talus are present below the Rock outcrops. <br />The Ustic Torriorthents are mainly very shallow with smaller amounts <br />of shallow, moderately deep and deep and Fell drained. They formed in <br />residuum from gneiss and granitic bedrock. These soils are variable, but <br />the following is representative. Typically, the soil is brown very <br />bouldery sandy loam 4 inches thick over extremely gravelly sandy loam <br />about 3 inches thick over partially weathered granodiorite bedrock or <br />hard gneiss at a depth of 7 inches. The soil is mildly alkaline. Soils <br />in Host areas of granodiorite overlie well weathered bedrock which can be <br />• dug out easily with a light backhoe for 1 to 3 feet. Soils over gneiss <br />overlie mainly hard bedrock. Most soils are noncalcareous except on foot <br />slopes. <br />