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high depending on slope and vegetation. The unit is primarily used for livestock grazing and wildlife habitat. The plant community consists mainly of Gambel oak, servicebeny, mountain brome, elk sedge, snowberry, and beardless wheat grass. Smaller amounts of bluegrass, chokecherry, low rabbit brush, slender wheat grass, Columbia needlegrass, and rose are also present. The production of vegetation suitable for livestock grazing is limited by the short growing season and limited available water capacity. The average annual production of air-dry vegetation is about 1,500 pounds per acre. The soil unit is used extensively as winter range for mule deer and elk and is considered part of the brushy loam range site. A related soil unit on the lower slopes of the hills is the Winnemucca-Claybum loam. The Winnemucca-Clayburn loams are typically deep and well drained. Permeabilities are low and available water capacity is moderate. Cffective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is moderate to high. The potential plant community ou tltese soils includes Gambel oak, serviceberry, elk sedge, mountain brome, snowberry, and Letterman needlegrass. Lesser amounts of chokecherry, slender wheat grass, and American milkvetch are also present. The soil unit on the east side of the hogback is the RJtone loam. ]t is a deep well drained soil formed in residuum and colluvium. 'fhe native vcgetation is mainly brush and grasses. Typically the upper part of the surface layer is dark grayish brown loam. The underlying material is brown very channery loam. Permeability is moderate and available water capacity is high. Runoff is medium and the hazard of water erosion is very high. This unit is used mainly for grazing and wildlife habitat. The effective rooting depth is 40 to 60 or more inches. The potential plant emnmunity on these soils includes Gambel oak, serviceberry, elk sedge, mountain brome, snowberry, big sagebrush, and Columbia needlegrass. The production of forage is limited by a shoes growing season. The parent rock material for soils on the west side hogback (Nagitsy and Torriorthents) is dre Dakota sandstone of Cretaceous age which forms a prominent north-south trending hogback east >;