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these limitations, the Spicerton series will produce an average <br />• of 700 pounds per acre (dry weight) of forage in a normal year, <br />due to additional run-on moisture. • <br />Tlie Aaberg-Earishman series consists of deep, well-drained <br />soils formed in material weathered from Coalmont shales or other <br />calcareous shales. They cover approximately 10% of the lease area <br />and occupy upland hills and ridges. Pe:-meability is slow <br />and available water capacity is low. Surface runoff is moderate. <br />Tl~e Crespin-Carlstrom stony clays cover approximately 7% of the <br />lease area. This complex is found on uplands and valley slopes, and are <br />also deep and well-drained soils reworked from weathered shale. <br />Tnese soils consist of a heavy clay loam, to clay with 0 to 10% <br />coarse fragments. They both have slow permeability, but the Cres- <br />• pin's water availability is high, while the Carlstrom has low water <br />availability. Surface runoff is rapid and the erosion hazard is <br />high from wind and moderate from water. <br />The Cryorthents occupy the steep terrace breaks and upland <br />ridges in the southern and central portion of the lease area. They <br />cover approximately 8% of the subject area. These soils are generally <br />shallow and underlain by soft shale and sandstone which show little _. <br />horizon development. These soils often contain areas of cobbled --- ' <br />material and are, therefore, well drained but have a low water- <br />holding capacity. These soils are on unfavorable exposures, and <br />much of the moisture is removed by strong winds. Runoff is rapid, <br />and severe. These factors coupled with a low fertility rating con- <br />tribute to restricted plant growth. Tnis type of soil regime is <br />• capable of producing only 300 ponds per acre of dry weight forage <br />-.nt:aily. <br />16 <br />