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divides. Often they have formed in calcareous windblown deposits of loamy texture. Surface soils are usually loams or sandy loams. Subsoils range from sandy loam to clay loam in texture and are moderately perme- able. Soil Mapping Unit 2.2: Moderately deeP and shallow shale and sandstone soils There is only a single delineation of this unit on the map. It is all within Carbon County, Wyoming, and extends as a broad belt from south of Muddy Mountain to the north boundary of the basin. The landscape is a succession of grass and sagebrush mantled low shale hills and sandstone ridges with intervening narrow alluvial valleys. A few low mountains and buttes rise above the hills and have clumps of serviceberry or oakbrush. The major component of this unit consists of moderately dark colored soils that have formed residually on shales and sandstones. Depth to bedrock OVer most of the delineation ranges from 20 to 40 inches but there are shallow soils with shale or sandstones at depths of less than 20 inches on upper slopes and ridges. Surface soils are thin but they have an organic matter content of 1 to 3 percent. Texture of the surface layer ranges from sandy loam to clay. Subsoils are dominantly clayey and are moderately to slowly permeable. Usually the soils are limy at or near the surface but depth to visible lime may range from 10 to 30 inches in the deeper soils. Soil Mapping Unit 2.3: Deep loamy soils This is one of the larger soil units and is mainly within Colorado. There are two delineations. The smaller one is south of the Yampa River in the vicinity of Juniper Springs, while the larger extends from Cedar Mountain northward to beyond the Little Snake River in Wyoming. The landscape consists of gently to steeply rolling sagebrush hills separated by numerous intermittent creeks and their tributaries. More level portions of the unit are confined to bottomlands and terraces bordering the Yampa and Little Snake rivers. Soils of this unit are deep and underlying bedrock is usually below a depth of 40 inches. Surface soil layers contain 1 to 3 percent organic matter, are noncalcareous, and range in texture from sandy loam to clay loam. Subsoils have moderate to strong grades of structure and vary in texture from sandy loam to clay. Permeability of subsoils is moderate or slow. Except for the deep sandy soils, lime is usually present within 24 inches of the soil surface. - 14 - t III , , III III I I III III I I I I I~ I I III III III