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52-Kim-Cascajo complex, 2 to 15 percent slopes. These soils are on breaks in areas where stream terraces cut through fans and fan terraces. They are also on fan terraces. The native vegetation is mainly grasses. Elevation is 5,000 to 6,000 feet. The average annual precipitation is 10 to 13 inches, the average annual air temperature is 49 to 53 degrees F, and the average frost-free period is 125 to 165 days. This unit is about 50 percent Kim soil and 35 percent Cascajo soil. The Kim soil is on foot slopes and in drainageways. The Cascajo soil is on the short, steeper breaks. Included with these soils in mapping are areas of the shallow Midway and Shingle soils on breaks. Midway soils have a surface layer of very gravelly clay loam. They make up about 5 percent of the unit. Shingle soils have a surface layer of very stony fine sandy loam. They make up about t0 percent of the unit. In the eastern half of sec. 30, T. 18 S., R. 69 W., small areas of soils that have a high content of gypsum crystals are below a depth of 12 to 24 inches. These soils are similar to the Kim soil, but the surface is covered by rock fragments. The depth to weathered, gypsiferous shale is about 35 l0 60 inches. Many of the gravelly or stony areas of these included soils are covered by pinydn and juniper. The Kim soil is deep and well drained. It Tormed in alluvium. Slopes range from 2 to 10 percent. The surface layer is typically pale brown loam about 4 inches thick. The substratum to a depth of 60 inches or more is loam. The soil is moderately alkaline. Permeability is moderate in the Kim soil. Available water capacity is high. Effective rooting depth is 60 inches or more. Runotf is slow to rapid, and the hazard of water erosion is slight to high. The Cascajo soil is deep and excessively drained. It formed in gravelly and sandy alluvium. Slopes range from 10 to 15 percent. The surface layer is typically very dark grayish brown very gravelly sandy loam about 6 inches thick. The upper 75 inches of the substratum is extremely cobbly sandy loam. The lower part to a depth of 60 inches or more is extremely cobbly sand. The soil is moderately alkaline. A layer that has a high content of accumulated calcium carbonate is at depth of 6 to 21 inches. Permeability is moderately rapid or rapid in the Cascajo soil. Available water capacity is very low, Effective rooting depth is 60 inches or more. Aunoff is medium or rapid, and the hazard of water erosion is moderate or high. This unit is used as rangeland. The potential plant community on the Kim soil is mainly blue grama, western wheatgrass, sideoats grama, and sand dropseed. The average annual production of air-dry vegetation is about 800 pounds per acre. If the condition of the range deteriorates, Russian thistle, ring muhly, red threeawn, and pricklypear increase. Range seeding is suitable if the range is in poor condition. The potential plant community on the Cascajo soil is mainly sideoats grama, blue grama, little btuestem, needleandthread, and Indian ricegrass. The average annual production of air-dry vegetation is about 750 pounds per acre. If the condition of the range deteriorates, red threeawn, blue grama, annual (orbs, and pricklypear increase. The main fimiiation affecting range seeding is the content of gravel and cobbles in the surface layer. Grazing management should include measures that protect the soil from excessive erosion. I the plant cover is disturbed, protection from flooding is needed to control gullying, streambank cutting, and sheet erosion. Loss of the surface layer results in a severe decrease in productivity and reduces the potential for producing suitable grazing plants. This unit is welt suited to homesite development in areas where the slope is less than about 8 percent. In the eastern half of sec. 30, T. 78. S., R. 69 W., areas of gypsiferous soil are not suitable for use as homesites. The capability classification is Vle, nonirrigated. The unit is about 60 percent in the Loamy Plains #6 range site and 40 percent in the Gravel Breaks #64 range site.