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The Ustic Torriorthents are shallow to deep and are well drained. <br />they formed in residuum and colluvium derived dominantly from <br />sandstone and shale. Ustic Torriorthents are h~gnly variable. No <br />single profile of Ustic Torriorthents is typical, but one commonly <br />observed in the survey area has a surface layer of light brown <br />bouldery clay loam about 4 inches thick. The underlying material to a <br />depth of 31 inches is light gray cobbly clay loam. Gray shale is at a <br />~'epth of 31 inches. <br />Permeability of the Ustic Torriorthents soil is moderately slow. <br />Available water capacity is moderate. Effective rooting depth is 10 <br />to 60 inches or more. Runoff is rapid, and the hazard of water <br />erosion is very high. <br />This unit is used for limited livestock grazing and wildlife <br />habitat. <br />The potential plant community is mainly pinyon pine and Utah <br />~~~niper, with an understory of Salina wildrye, muttongrass, and Indian <br />ricegrass. The average annual production of air-dry understory <br />vegetation is about 100 to 500 pounds per acre. <br />If the condition of the understory deteriorates, Fendler threeawn, <br />hairy goldaster, broom snakeweed, and pricklypear cactus increases. <br />Where the understory is in poor condition, these plants are dominant. <br />Grazing should be managed so that the desirable balance of species is <br />maintained in the plant community. <br />~Y <br />