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frost -free season of 90 to 130 days. These characteristics reflect a cooler climate than is defined <br />for the series at its type location, but they do no affect the taxonomic classification. Use or <br />behavior of the soils is not significantly affected. <br />Progresso Series <br />Depth class: moderately deep <br />Drainage class: well drained <br />Permeability: slow <br />Landform: hill, mesa, ridge, structural bench, terrace <br />Parent material: alluvium derived from sandstone <br />Elevation: 5,300 to 7,400 feet <br />Slope: 1 to 12 percent <br />Climatic data: <br />Average annual precipitation: 10 to 15 inches <br />Average annual air temperature: 45 to 48 degrees F <br />Frost free period: 90 to 130 days <br />Taxonomic class: Fine -loamy, mixed, mesic Lithic Ustollic Haplargids <br />Typical Pedon <br />Map unit in which located: Barx-Progresso complex, 3 to 12 percent slopes <br />Location in survey area: about 100 feet east and 2,300 feet north of the southwest corner of Sec. <br />16, T. 48 N., R. 17 W. <br />A---0 to 7 inches; reddish brown (5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; weak <br />fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; <br />slightly alkaline; clear smooth boundary. <br />Bt -7 to 14 inches; reddish brown (5YR 5/4) clay loam, reddish brown (5YR 4/4) moist; weak <br />medium subangular blocky structure; hard, friable, slightly sticky and plastic, slightly <br />alkaline; clear wavy boundary. <br />Btk-14 to 24 inches; reddish brown (5YR 5/4) clay loam, yellowish red (5YR 4/6) moist; <br />moderate medium subangular blocky structure; hard, friable, slightly sticky and plastic, <br />calcium carbonate segregated in common fine irregularly shaped soft masses; 20 percent <br />calcium carbonate equivalent; moderately alkaline; gradual wavy boundary. <br />Bk -24 to 36 inches; white (5YR 8/1) sandy loam, pink (5YR 7/4) moist; massive; hard, very <br />friable, slightly sticky and plastic, calcium carbonate disseminated throughout and on the <br />gravel as thick pendants; 31 percent calcium carbonate equivalent; violently effervescent; <br />moderately alkaline; abrupt wavy boundary. <br />R-36 inches, hard sandstone <br />Section 2.04.9 Page 24 Sept. 2015 (TR -11) <br />