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PUEBLO AREA, COLORADO thick lime coatings on bottom o[ pebbles and cobbles; moderately alkaline; dear, wavy boundary. C?-21 to 00 inches, very pale brno~n (IOYF i/3) stratified gravel and coarse sand, brown (lOYR 5f3) when moist; single grained; loose; nonsticky and nonelastic; 50 per- cent gra~'cl, 20 percent cobbles; calcareous; moderately alkaline. The .41, AC, and Clca horizons range from very- gravelly sandy loam to very gravelly sand. Coarse fragments make up 35 to SD percent of the C2 horizon, and 5 to 25 percent of these fragments arc more than 3 inches in diameter. CaE-Cascajo very gravelly sandy loam, 5 to 2a percent slopes. This soil is on high alluvial terraces along the major drainageways. The areas cover as much as 200 acres. This soil has the profile described as representative of the series, but in small areas in the southwestern part of the survey area along the 1lIttddc Creek drainageway it has a thicker, darker colored surface layer, and in other areas on the Ft. Carson bIilitary Reservation it is redder. Included with this soil in mapping are areas of Cascajo-Shale outcrop complex in narrow strips on ver}~ steep side slopes along the Arkansas River. These areas make up about 20 percent of the acreage. P,unoff is moderately- slow, and the hazard of erosion is slight. This soil is a source of commercial grave]. In many places near Pueblo, the gravel is strip mined down to I-3 13 the undel•lping shale. This soil has potential for wild- life habitat. The native vegetation is mostly blue grama, sand dropseed, needleandthread, cactus, and yucea (fig. 3). Capability unit VIIs-2, nonirrigated; Gravel Breaks range site. CsE-Cascajo-Shale outcl'op complex, 5 to 30 per- cent slopes. This complex is on small shale knolls, ridges, spurs, and scarps that are capped with Cascajo very gravelly sanely loam. It is made up of about 60 percent Cascajo ver}• gravelly sandy loam and 40 percent Shale outcrop and shale-derived material. Areas of this complex cover as much as 200 acres. Vel•y steep areas of Shale outcrop are on the scarps. There is gl•avel along the rim of these areas. Runoff is 1•apid, and the hazard of erosion is high. This complex has a sparse plant cover, and in most places it is severely el•oded and dissected by gullies. This complex is a limited source of gravel and has little value for glazing. It has potential for wildlife use if the habitat can be improved. Capability unit VIIs-2, nonit•t•igated; Cascajo soil in Gravel Bl•eaks 1•ange site; Shale outcl•op not assigned to a range site. Denver Series The Denvel• series consists of deep, well-drained soils. These soils fol•med on uplands in cla}•ey alluvium or residuum that was derived from shale. The slope is 3 to 9 pel•cent, and elevation is 6,000 to 7,200 feet. The avel•age annual precipitation is li inches. The average annual tenlpet•atul~e is 48° F, and the frost-free season is 115 to 145 days. The native vegetation is mainly plains grasses. In a representative profile the surface layer is gra}•ish-bl•o~an clay loam about 7 inches thick. The upper part of the subsoil is grayish-brown clay loam and clay about 15 inches thick, and the lo~vel• part is grayish-brown clay about 19 inches thick. The under- lyinglayer is grayish-brown clay about 19 inches thick. Figure 2.-Profile of CasG'li0 very gravely sandy loam. Figure 3.-Cascajo soils ran provide suitable food and cover for wildlife, but water is not available in many places.