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74 <br />Oiyon and juniper trees, and other areas are nearly <br />barren. The average annual production of air-dry <br />vegetation is about 100 pounds per acre. Livestock <br />grazing is limited by sparse vegetation and steepness of <br />slope. <br />The pinyon and juniper trees have very little economic <br />value. Some are used for firewood, fenceposts, and <br />Christmas trees; however, in most areas steepness of <br />slope limits access for the harvesting of wood products. <br />This unit is used extensively as winter range and cover <br />for mule deer and elk, because it is mainly on south- <br />facing side slopes and is open most of the winter. <br />This map unit is in capability subclass We. It is in <br />Stony Foothills range site. <br />92 Trembles loam, wet. This deep, moderately well <br />drained soil is on alluvial valley floors, flood plains, and <br />low stream terraces. It formed in mixed alluvium. Slope is <br />0 to 3 percent. Areas are elongated and are 20 to 200 <br />acres. The native vegetation is mainly low shrubs and <br /> <br />i ?.F?t y'r L `Sr ?rK ,r» <br />M S. r '. <br />tr" a t <br />fr ? ? <br />Soil survey <br />grasses and cottonwood trees and willows along major <br />streams. Elevation is 5,800 to 6,200 feet. The average <br />annual precipitation is 14 to 16 inches, the average <br />annual air temperature is 42 to 45 degrees F, and the <br />average frost-free period is 85 to 105 days. <br />Typically, the upper part of the surface layer is light <br />gray loam about 3 inches thick. The lower part is pale <br />brown loam about 5 inches thick. The upper 12 inches of <br />the underlying material is very pale brown fine sandy <br />loam, the next 22 inches is very pale brown fine sandy <br />loam, and the lower part to a depth of 60 inches or more <br />is light gray fine sandy loam that has lenses of sandy <br />loam. In some areas the surface layer is sandy loam or <br />clay loam. <br />Included in this unit are small areas of Glendive fine <br />sandy loam, Havre loam, Kobar silty clay loam, Patent <br />loam, Redrob loam, and Tisworth fine sandy loam. Also <br />included are small areas of soils that are similar to this <br />Trembles soil, but the underlying material is very cobbly <br />and gravelly sand. Included areas make up about 15 <br />figure 6.-Typical area of Torriorthents-Rock outcrop complex, 15 to 90 percent slopes. G/endive soils are on the colluvial and <br />alluvial toe slopes and valley sides, Barcus soils are on the local outwash fan in foreground, and Havre and Hagga soils <br />are on the alluvial bottom in right center.