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Typically the surface layer is 4 to 6 inches thick, brown or dark brown, friable, and has <br />granular structure. The subsoil is brown or dazk brown, calcazeous clay loam that is massive or has <br />weak, subangulaz blocky structure. The substratum, below a depth of 15 to 20 inches, is brown, <br />calcazeous loam. <br />This soil is susceptible to erosion. The organic matter content is moderately low, and the <br />structure is only moderately stable. <br />(BdAI Billings Silry Clay, 0 to 2 Percent Slopes <br />Soils of the billings series aze grassland soils that are formed on alluvial fans in sediments <br />washed from adjacent exposures of gray and olive shale and siltstone. Soils of this series aze deep, <br />well drained, and moderately fine textured or fine textured. The billings silty clay, 0 to 2 percent <br />slopes, occurs on the lower end of the gently sloping alluvial fans. <br />Typically the surface layer is 6 to 10 inches thick, grayish brown, and has platy or gaanulaz <br />structure. The subsoil is weakly developed, is light yellowish brown, calcareous silty clay loam or <br />clay loam. <br />This soil is susceptible to erosion and piping is common. The organic matter content is low, <br />and the structure is weak and unstable. <br />(VeALVerna1 Clav Loam, 0 to 2 Percent Slopes <br />Soils of the Vernal series are grassland soils that aze formed on stream terraces in fairly <br />uniform, calcareous material underlain by clean sand and gravel. Soil'of this series are deep, well <br />drained, and moderately fine textured. The Unwmpahge loam, 0 to 2 percent slopes, occurs on <br />terraces. <br />Typically the surface layer is 4 to 5 inches thick, light brown to brown, friable, and has <br />gaanulaz structure. The subsoil is moderately well developed, brown or reddish brown, moderately <br />fine texture and has prismatic or blocky structure. The substratum, which begins at a depth of 18 to <br />20 inches below the surface, is light colored, calcazeous loose sand and gravel. Accumulations of <br />secondary calcium carbonate occur in the lower part of the subsoil and the upper part of the <br />substratum. The depth to the bedrock is 60 inches or more. <br />The soil is not highly susceptible to erosion. The organic content is moderate, and the <br />North R-34 Pit 1/07 <br />25 <br />