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the solum and are in MLRA 51. Millett soils contain 25 to 75 percent gravel and cobbles in the lower part <br />of the solum. Scholle soils contain 15 to 35 percent gravel in the control section. Tapia soils contain <br />caliche fragments in the Bt and Bk horizons. Toluca soils are in MLRA 58A and are yellower than 5YR <br />throughout. Tuweep soils are yellower than 5YR and formed in alluvium from pyroclastics and basalt. <br />GEOGRAPHIC SETTING: <br />Parent material: reworked eolian material and alluvium derived from sandstone <br />Landform: alluvial fans, terraces, hills, and mesas <br />Slopes: 0 to 15 percent <br />Elevation: 4,400 to 7,800 feet <br />Mean annual temperature: 46 to 55 degrees F <br />Mean annual precipitation: 9 to 14 inches <br />Precipitation is fairly evenly distributed throughout the year with July and August being slightly wetter <br />and June being slightly dryer. <br />Frost-free period: 100 to 175 days <br />GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abra, Begay, Mivida, Rizno, Sazi, Strych, <br />and Windwhistle soils. Abra soils lack an horizon of clay accumulation. Begay and Mivida soils have <br />coarse-loamy particle size control sections. Sazi and Windwhistle soils have bedrock at a depth of 20 <br />to 40 inches deep. Strych soils have more than 35 percent rock fragments in the particle size control <br />section. <br />DRAINAGE AND PERMEABILITY: well drained, negligible to high runoff, moderate or moderately slow <br />permeability <br />USE AND VEGETATION: These soils are used mainly for rangeland. The potential vegetation is Indian <br />ricegrass, galleta, Wyoming big sagebrush, and winterfat. <br />DISTRIBUTION AND EXTENT: Southeast Utah and southwest Colorado. LRR D, MLRA 34, 35, 39. <br />This series is of moderate extent. <br />MLRA OFFICE RESPONSIBLE: Phoenix, Arizona <br />SERIES ESTABLISHED: Utah-Central Part, Grand County, Utah 1985. The name comes from the Bar <br />X wash. <br />REMARKS: Diagnostic horizons and features recognized in this pedon are: <br />ochric epipedon: The zone from 0 to 3 inches. (A) <br />argillic horizon: The zone from 9 to 36 inches. (Bt1, Bt2, and Btk) <br />(Revised June 2008) Attachment 2.04.9-3-5