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Map unit 98B ( Valleycity - rock outcrop complex) occurs on steep mesa side slopes. Hardness of <br />bedrock varies depending on the underlying strata. Coarse fragments range from boulders to <br />cobbles and are residual and colluvial in nature. Valleycity soil has the same physical and chemical <br />properties as those soils similarly named in the survey area. Valleycity is outside the range of <br />characteristics compared to the survey area, in that it occurs in an area of 5 to 8 inches mean <br />annual precipitation. <br />Map unit 98C (Monierco fine sandy loam) occurs on mesa summits, ridges and crests. Hardness <br />of bedrock varies depending on the underlying strata. <br />Map unit 98D (Bowbac - Bowdish complex) has thinner Quaternary eolian deposits than map unit <br />98E with a mean depth to bedrock of 30 inches. These deposits have developed cambic horizons, <br />weak argillic horizons and secondary accumulations of carbonates. The accumulation of <br />carbonates is reflected in a higher pH in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and <br />Bt horizons (Lift A) averages 7.7 and in the Bk Btk and C horizons (Lift B ) averages 8.1. <br />Map unit 98E (Darvey -Bari complex) consists of areas of deep Quaternary eolian deposits. These <br />Quaternary deposits overlie Dakota Sandstone and Burro Canyon Formations with depth to <br />bedrock ranging 40 inches to greater than 72 inches with a mean depth of 53 inches. These <br />deposits have stabilized and formed cambic horizons and in some places weak argillic horizons. <br />Additionally, they have developed secondary accumulations of carbonates. The accumulation of <br />carbonates is reflected in a higher pH in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and <br />Bt horizons (Lift A) averages 7.7 and in the Bk Btk and C horizons (Lift B) averages 8.2. Soil in this <br />map unit is used primarily for irrigated pasture and hay crop. Barx soil is the second component <br />(30 percent) in this map unit. The Darvey and Barx soil types are both prime farmland soil in San <br />Miguel County, Colorado if the soil is irrigated by an adequate and dependable water supply. <br />Map unit 98F (Hap largrids - Endoaqueots association) occurs in natural drainage areas that <br />eventually form shallow valleys on the mesa and on the low lying area near Tuttle Draw. Depth to <br />bedrock varies widely in this map unit. Haplargids with varying depths to bedrock form on drainage <br />August 2013 (PR 08) 2.04.9 -14 <br />