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BILLINGS SILTY CL6Y, 0 to 2 percent elopes, Clare IIIs Land (Ba) This soil is on alluvial materials - 4 to about 40 feet thick - that largely came from Mancos shale. The 8- or 10-inch surface soil consists of light brownish-gray, gray, or olive-gray silty clay. The layer is similar to the surface ]ayer of Billings silty clay loam soils but it ie harder sad, in many places, darker. The subsoil consists of aimilar],y colored layers of silty clay loam, silt loam, and silty clay. In places the soil is silty clay to depths exceeding 4 feet. The entire profile is firm when moist and has a massive structure. The subsoil has many small irregularly shaped Light-gray specks or indistinct mottles. Poorly defined light-colored streaks indicate • the presence o£ lime, gypsum, or salts. The surface soil and subsoil are calcareous, the lime being well distributed. The fine texture o8: the soil greatly retards penetration of roots, moisture, and air. Surface runoff is very slox to slox where the slope is-less than 1 percent. Internal drainage is very slow because the aubaoil_is massive and very slowly permeable. Eben with ample drainage ditches, the discharge of irrigation water is slow. Tilth and workability are not gpod, because the soil has a fine texture and a low content of organic matter. Moreover, some fields contain areas 20 to 60 feet across that have excessive amounts of salts. Slick spots also occur. These salty areas and slick spots produce low or negligible yields of most crops and are extremely difficult to eliminate. Soil limitations are classified ae severe for local roads and streets (poor traffic-supporting capacity, moderate to high water tables common), dwellings with basements (high shrink-swell potential, slow internal • drainage, subject to water table build up), sanitary land fill (poor drainage, clayey texturea),and septic tank absorption fields (slow permeability, poor internal drainage, seasonal high water table).