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. 401~ ~ ~ The North and South Side Collection System features occur near an elevation of 10,000 feet. This is near the upper limit of the brown-gray podzols on the West Slope. Therefore, these soils are more characteristic of the lithosols and the alpine lithosols depicting very little to no profile development. The parent materials are talus and slope wash. The depth varies from a few inches on the steep slopes to several feet on the valley floors. The soils of the steep slopes are composed of cobbles and boulders in a silty sand and gravel matrix. The valley floors and the alpine meadows have organic topsoil ranging in depth from a few inches up to several feet. This topsoil is composed of decayed organic matter, clay, silt, and sand. The subsurface soil is generally composed of cobbles and boulders in a matrix of sand and gravel. Marshy areas in the valley floors and alpine meadows have an accumulation of peat ranging in depth from a few inches to 3 feet. . The soils of the Fryingpan-Arkansas Project features on the eastern slope of the Continental Divide above 10,000 feet eleva- tion are generally the same as those occurring in the collection systems' area. However, all project features east of the Divide are below 10,000 feet in elevation. The soils are the lithosols which have developed under less humid conditions than those at the higher elevations. Therefore, these soils are typically neutral or basic in pH. The parent materials of these soils are calcareous to noncalcareous cobbles, gravels, and sands from outwash. The depth of the soil ranges from a few inches to several feet. The topsoil is generally composed of a shallow layer of sandy or gravelly loams and loamy sands; and the subsoil is composed of calcareous cobbles~ gravels~ and ~~nn~ The 9oi18 of the marshy areas and bottom lands of the flood plains have shallow A-horizons consisting of sandy loans with peat and sub- soils of cobble and gravel (Figures III-II and 111-12).. The soils of the plains .area of the Fryingpan-Arkansas Project are in the central and western portion of the Great Plains brown soil belt and have originated from alluvial, aeolian, and residual sources. They have developed under semiarid climatic conditions which have limited the production of organic matter. Lime is abundant in the soils, and the zone of maximum lime accumulation usually occurs between depths of 18 to 36 inches in the soil profile. In the service area the principal land forms occurring within the project boundaries are estimated as follows: 27 percent occur as bottom lands, 24 percent as terraces, and 49 percent as uplands. . 111-26