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4{. ,;:>s' i ~ . ~~'.,:F4 i, it ~~ ~. f. f/ , C horizon. Thickness of the mollic epipetlon is 7 to ]6 Snches. Rock fragments ti ~~i range from 5 to 35 percent throughout the solum and C horizon. ~.,yi The A horizon has hue of 7.SYR or lOYR, value o4 3 or 4 dry, 2 or 3' , moist, and chorma of 2 or 3. It is neutral or mildly alkaline. The Bt horizon has a hue of 7.5YR or lOYR, value of 5 or 6 dry, 4 or 5 moist, and chorma of 3 through 5. Colors are commonly variegated due to the nature of the parent material, It is a heavy clay loam or clay and has 35 to 45 percent clay, 20 to 50 percent silt, and ]0 to 55 percent sand with less than 35 pezcent being fine or coarser. It is slightly acid or neutral. The C horizon has hue of 7,SYR through 2.SY. It is typically a clay loam or sandy clay loam. It is slightly acid to mildly alkaline. V4-CD - Big Hlue Clay Igam, 0 to 6 Percent Slopes The Big Blue series is a member of the fine, montmorillonitic ' I {;, (calcareous), frigid family of Typic Haplaquolls. Soils of this series are deep, poorly drained, and fine-textured. These soils have formed i~ fine- texture alluvium weathered from shale. They occupy nearly level toy gently '} sloping low terraces and valley bottoms. The average annual precipitation is ]6 to 20 inches. The (average annual air temperature is 44 to 50 degrees. The average frost free season is ]00 to 120 days. I Typically, the upper part of the surface layer is dark grayish brown clay loam about 5 inches thick. The lower part of the surface layer is dark grayish brown silty clay about 90 inches thick. The substratum is gray cal- careous silty clay to 60 inches or more. Gleyed colors and mottles are common in the subsoil and substratum. Included in this unit are small areas of Alamosa loam, Hekdt silty clay loam, Limon seeped phase, and Sili clay loam. Permeability is slow. Effective rooting depth is about 18 finches. Available water capacity is high. Surface runoff is slow and erosion hazard is r <. .~s ~