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Piedra Area, Colorado The native vegetation in most areas is mainly ponderosa pine, some oak brush, fescue, and danthonia. The hazard of plant competition is moderate for tree seedlings, Use of equipment is moderately limited in spring when the soil is wet. Steepness of slope and depth to rippable shale are the main limitations for most uses. This map unit is in capability subclass Vlle. 38A-Pescar sandy loam, 0 to 4 percent slopes. This deep, somewhat poorly drained soil is on terraces along major streams. It formed in alluvium derived from mixed rock sources. Elevation is 6,000 to 8,000 feet. The average annual precipitation is about 15 to 22 inches. The surtace layer is light brownish gray sandy loam 4 to 12 inches thick. It is stratified with thin lenses of loamy fine sand. The next layer is pale brown fine sandy loam 5 to 22 inches thick. It is stratified with lenses of loamy fine sand and loam. The next layer is pale brown very gravelly sand several feet thick. It is stratified with tenses of loamy sand. Included in this unit are areas of Hunchback soils and Riverwash. Permeability of this Pescar soil is moderate in the upper part and very rapid in the lower part. Available water capacity is moderate. Runoff is slow, and the hazard of water erosion is slight. A water table is at a depth of 18 to 30 inches in spring and early in summer. This soil is subject to brief periods of flooding in spring and early in summer. This unit is used for forage production. The native vegetation in most areas is mainly bluegrass, clover, carex, clematis, and lanceleaf cottonwood. The soil in this unit is slightly limited for plant growth and engineering uses. This map unit is in capability subclass VIw. 39-Riverwash. Riverwash is along the major rivers and Creeks in the survey area: It consists of deposits of waterworn sand, gravel, and cobbles. In most areas these materials are mixed; however, in some places the sand and grave! are not mixed. Riverwash is mainly barren of vegetation. A few grasses, (orbs, and shrubs grow in some areas. Included in this unit are small areas of Pescar soils, Muggins soils, and other soils near streams, This map unit is in capability subclass Vlllw. 40E-Rogert gravelly loam, 25 to 65 percent slopes. This shallow, well drained sail is on mountainsides and valley sides. It formed in residuum derived mainly from andesite and quartz latite. Elevation is 8,500 to 10,000 feet. The average annual precipitation is about 22 to 32 inches. The surtace layer is dark grayish brown gravelly loam 5 to 16 inches thick. The underlying material is light brownish gray gravelly loam 2 to 10 inches thick. Hard 25 andesite and quartz latite are at a depth of 12 to 20 inches. Included in this unit are areas of Skyway and Woodrock soils, Igneous outcrop, and Cryorthents. Also included are areas of soils that have slopes of more than 65 percent. Permeability of this Rogert soil is moderately rapid. Available water capacity is low. Runoff is medium, and the hazard of water erosion is high. This unit is used as rangeland. If this unit is used as rangeland, the main limitation is steepness of slope. The native vegetation in most areas is mainly fescue, bluegrass, and scattered (orbs and Shrubs. The main limitations for engineering uses are steepness of slope and shallow depth to hard bedrock. This map unit is in capability subclass Vlle. 41-Rubble land. This unit consists of talus, felsenmeer, and rock debris at the base of steep cliffs, on the top of broad alpine ridges, and in alpine valleys (fig. 4). Areas of the unit are made up mainly of rock fragments that range in size from gravel to scones. Most Figure d. Area of Rubble land in foreground; cirque lake in center.