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k y r s PUEBLO AREA, COLORADO thick lime coatings on bottom of pebbles end cobbles; moderately alkaline; clear, wavy boundary. CZ-21 to 60 inches, very pale brown (lOYR 7/3) stratified grovel and coarse sand, brown (lOYR 5/3) when moist; single grained; loose; nonsticky and nonelastic; 50 per- cent gravel, 20 percent cobbles; calcareous; moderately alkaline. The A1, AC, and Cica horizons range from very gravelly sandy loam to very gravelly sand. Coarse fragments make up 35 to 80 percent of the C2 horizon, and 5 to 25 percent of these fragments are more than 3 inches in diame!er. CaE-Cascajo very gravelly sandy loam, 5 to 2S 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 Muddy Creek drainageway it has a thicker, darker trolored surface layer, and in other areas on the Ft. Carson Military Reservation it is redder. Included with this soil in mapping are areas of Cascajo-Shale outcrop complex in narrow strips on very steep side slopes along the Arkansas River. These areas make up about 20 percent of the acreage. Runoff is moderately slow, and the hazard of erosion is slight. This soil is a source of commercial gravel. In many places near Pueblo, the gravel is strip mined down to the underlying shale. Th life habitat. The nativ grams, sand dropseed, yucca (fig. 3). Capabilil Gravel Breaks range site. CsE-Cascajo-Shale o cent slopes. This compl ridges, spurs, and scarps very gravelly sandy loaf percent Cascajo very j percent Shale outcrop Areas of this complex Very steep areas of Sha There is gravel along th Runoff is rapid, and t This complex has a spa places it ie severely erod This complex is a lim'. little value for grazing. use if the habitat can VIIs-2, nonirrigated; C range site; Shale outcroj 13 soil has potential for wild-' vegetation is mostly blue ~dleandthread, cactus, and unit VIIs-2, nonirrigated; itcrop complex, 5 to 30 per- ~x is on small shale knolls, that are capped with Cascajo i. It is made up of about 60 ravelly sandy loam and 40 and shale-derived material. over as much ae 200 acres.' e outcrop are on the scarps. rim of these areas. to hazard of erosion is high. se plant cover, and in most ~d and dissected by gullies. `.ed source of gravel and hasp It has potential for wildlife ie improved. Capability unit iscajo soil in Gravel Breaks not assigned to a range site. Denver Series The Denver series soils. These soils forme or residuum that was t 3 to 9 percent, and elev average annual precipil annual temperature is is 115 to 145 days. Tl plains grasses. In a representative grayish-brown clay lo. upper part of the sub: and clay about 15 inch grayish-brown clay alx lying layer is grayish-b lsists of deep, well-drained n uplands in clayey alluvium Ived from shale. The slope is on is 6,000 to 7,200 feet. The on is 17 inches. The average F, and the frost-free season native vegetation is mainly rofile the surface layer is about 7 inches thick. The is grayish-brown clay loam thick, and the lower part i~ 14 inches thick. The under vn clay about 14 inches thick Fipure J.-Caeeajo voila tan ~rovide suitable food and Borer wildlife, but water ie at available in many places. Fipure 2.-Profile o[ Cascajo very gravelly sandy locos.