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4 - 37 <br />The surface horizon is very fine sandy loam or loam. Peaty horizons occur between 3 and <br />18 inches. Gravely or very gravelly Tenses occur below 40 inches. The control section is mostly <br />fine sandy loam or loamy sand with 1 J2 to 6 inch lenses of coarser or finer textures, but clay <br />typically averages 5 to 18 percent. Typically these soils are calcareous throughout, but may be <br />leached to 6 or 8 inches. Rock fragments range from 0 to 15 percent. <br />HAVRE SERIES <br />The Havre series consists of deep, moderately fine textured, well-drained soils. These soils <br />formed in alluvium derived from sandstone and shale. Elevation range is 5,250 to 5,500 feet. <br />Annual precipitation is about 10 inches. The mean annual soil temperature ranges from 40 ° to <br />47 ° F, and the frost•free period is 105 to 135 days. The native vegetation is a greasewood <br />shrubland community. <br />The Havre series is a member of the fine•loamy, mixed (calcareous), frigid family of Ustic <br />Torrifluvents. A representative profile of Havre loam, sample point MC 8, about 250 feet east <br />and 2,425 feet south of the northwest comer of Section 21, T 7 S. R 102 W. at an elevation of <br />• 5,445 feet is: <br />All 0 to 1 1/2 inches; light brownish gray (2.5 YR 6/2) sandy clay, dark brown (10 YR <br />4/3) moist; weak very thin platy parting to very fine granular structure; hard, very <br />friable, slightly sticky and slightly plastic; strongly calcareous; pH 7.7; clear smooth <br />boundary. <br />A12 1 1/2 to 8 inches; brown (10 YR 5/3) loam, dark brown (10 YR 4/3) moist; moderate <br />coarse angular blocky and prismatic structure; slightly hard, very friable, slightly <br />sticky and slightly plastic; strongly calcareous; pH 8.5; gradual smooth boundary. <br />C1 8 to 17 inches; brown (10 YR 5/3) silty clay loam, dark brown (10 YR 4/3) moist; <br />moderate medium subangular blocky structure; slightly hard, firm, sticky and plastic; <br />strongly calcareous; pH 8.9; diffuse boundary. <br />C2 17 to 30 inches; brown (10 YR 5/3) sandy clay loam, dark brown (10 YR 4/3) moist; <br />massive structure; soft, very friable, slightly sticky and slightly plastic; calcareous; <br />pH 8.9; arbitrary boundary. <br />C3 30 to 55 inches; brown (10 YR 5/3) sandy clay loam, dark brown (10 YR 4/3) moist; <br />w massive structure; soft, very friable, slightly sticky and slightly plastic; calcareous; <br />pH 8.9; gradual smooth boundary. <br />M~ Volume 1 4-29-96 <br />