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Rombo Series • Depth class: Moderately deep Drainage class: Well drained Parent material: Colluvium, residuum Landform: Mountains Landscape position: Mountainsides, backslopes Slope: 35 to 50 percent Average annual precipitation: 16 to 22 inches Average annual air temperature: 42 to 46 degrees F Taxonomic class: Fine, mixed, frigid Typic Ustochrepts Typical Pedon Typical pedon of a Rombo channery silty clay loam in an area of Saruche-Rombo complex, 35 to 50 percent slopes, about 1.5 miles north of Colorado state line in Colorow Canyon, T. 35 S., R. 65 W. • A=0 to 4 inches; grayish brown (2.5Y 5/2) channery silty clay loam, very dark grayish brown (2.5Y 3/2) moist; moderate very fine granular structure; hard, firm, sticky and plastic; 15 percent channery, 15 percent flagstones; mildly alkaline; clear smooth boundary. Bw=4 to 24 inches; grayish brown (2.5Y 5/2) channery silty clay loam, dark grayish brown (2.5Y 4/2) moist; moderate fine subangular blocky structure; very hard, very firm, sticky and plastic; 15 percent channery, 10 percent shale fragments; neutral; clear smooth boundary. Bk=24 to 34 inches; gray (2.5Y 5/0) silty clay loam, dark gray (2.SY 5/ moist and crushed; weak fine subangular blocky structure; very hard, firm, • sticky and plastic; few calcium carbonate spots on shale fragments; 35 percent shale fragments; neutral; clear smooth boundary. Cr--34 to 60 inches; soft siltstone and shale. Range in Characteristics Thickness of the solum: 20 to 40 inches Depth to bedrock: 20 to 40 inches Content of coarse fragments in the control section: 10 to 30 percent Texture=silty clay loam or clay loam Clay content: 35 to 45 percent Reaction: neutral or mildly alkaline 5-1-20