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8,000 to 9,000 feet. They formed in alluvium from mixed sources. The Jodero soil makes up <br />about 45 percent of the mapping unit, and Lolo soils make up about 35 percent. Jodero soils <br />differ from Lolo soils by having less than 15 percent rock fragments, and by having an irregular <br />decrease of organic matter with increase of depth. Areas of very gravelly sand or very cobbly <br />sand make up about 20 percent of the mapping unit. <br />Typically, the Jodero soil has dark loam surface layer, about 24 inches thick. The underlying <br />material is grayish brown loam, stratified with thin layers of grayish brown sandy loam or loamy <br />sand. Below 48 inches, there may be layers of sandy clay loam or loam extending to 60 inches <br />or more. <br />Permeability is moderate. The effective rooting depth is 60 inches or more, and available water <br />capacity is high. Surface runoff is slow and erosion hazard is slight. <br />The Lolo soil typically has a dark grayish brown, gravelly sandy loam surface layer about 25 <br />inches thick. The subsoil layer is yellowish brown, very cobbly sandy loam about 12 inches <br />thick. The substratum is yellowish brown, extremely cobbly sandy loam that extends to 60 <br />inches or more. <br />Permeability is moderately rapid. The effective rooting depth is 60 inches or more and <br />available water capacity is moderate. Surface runoff is slow and erosion hazard is slight. Water <br />tables occur at one and one -half to two and one -half feet below the surface during the spring <br />snow melt season. Flooding occurs for brief periods in the spring in some places. <br />TOLMAN -ROCK OUTCROP COMPLEX <br />These gentle to steep (nine to 65 percent) slope soils occur on mountain and foothill side slopes <br />at elevations of 8,100 to 9,000 feet. Rock outcrop makes up 15 to 20 percent of this unit. The <br />exposed bedrock consists of tuff, rhyolite, andesite and breccia. The shallow soils present have <br />an effective rooting depth limited by depth to bedrock. Available water capacity is low. Surface <br />runoff is rapid and erosion hazard is moderate. <br />The shallow, well- drained, very stony Tolman soil makes up 55 to 70 percent of this unit. It <br />formed in thin rhyolitic material and is ten to 20 inches thick over bedrock. Typically, the <br />surface layer is grayish brown, very cobbly clay loam about six inches thick. The substratum is <br />yellowish brown, extremely stony, light clay loam about three inches thick directly overlying <br />hard fractured rhyolitic tuff bedrock at ten to 20 inches depths. <br />Permeability is moderate. Effective rooting depth ranges from ten to 20 inches. Available <br />water capacity is very low. Surface runoff is rapid and erosion hazard is severe. <br />BUSHVALLEY - TELLURA COMPLEX <br />These gentle to steep (nine to 65 percent) slope soils occur on mountain ridges and side slopes <br />at elevations of 8,600 to 10,000 feet. The Bushvalley soils make up about 45 percent of the <br />