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76F. Dollard-Shale Outcrop complex, 25 to 50 percent slopes. This <br />steep to very steep soil is on ridges and mountain sideslopes at ele- <br />vations of 7,200 to 8,500 feet. The Dollard soil makes up about 65 <br />percent of the unit. About 20 percent of the unit is shale outcrop. <br />Included in this unit is 15 percent soils that are deep (40 to 60 <br />inches) to shale. It formed in residual Mancos shale. Typically the <br />surface layer is dark grayish-brown clay about 21 inches thick. This <br />grades into weathered shale bedrock at depths between 20 and 30 <br />inches. <br />Permeability is slow. Effective rooting depth is 10 to 20 inches and <br />the available water capacity is 0,13 to 0.15 in./in. Surface runoff <br />is rapid and the erosion hazard is high, <br />Dollard soils have severe limitations for all urban uses and should be <br />avoided for development, The soils have any or all of the following <br />hazards: high shrink-swell poterd:ial, slow permeability, shallow <br />• depth to bedrock, exposed shale bedrock, high erosion potential and <br />sediment yield. They are highly susceptible to down slope movement, <br />Topsoil suitability is poor due to slope and high percent of clay, <br />86F. Jerry loam, 25 to 65 percent slopes. This deep, well drained <br />soil is on mountain sideslopes at elevations of 7,200 to 8,500 feet, <br />It formed in colluvium and residuum from sandstone and shale. <br />Included in this unit are small areas of Argic Pachic Cryoboroll <br />soils, 25 to 65 percent slopes. Typically the surface layer is very <br />dark brown loam about 10 inches thick, The subsoil is brown gravelly <br />clay loam about 28 inches thick. The substratum is gravelly clay loam <br />that extends below 40 inches. <br />Permeability is slow. Effective rooting depth is 20 to 30 inches, <br />Available water supply is 0.14 to 0.20 in,Jin. Surface runoff is <br />moderate and erosion hazard is moderate. Topsoil suitability is poor <br />due to steep slopes. <br /> <br />3-106 <br />