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I I L.1 I I C I I I I I I 11 1 Loamy Alluvial Land Loamy alluvial land (Lo) is in swales or on flood plains in the northern part of the Area. Slopes are 1 to 5 percent. These areas are long and narrow, and most of them are less than 40 acres in size. This highly stratified land type is dark colored to a depth of 30 inches or more. To a depth of 20 inches this land is sandy loam to clay loam in tex- ture. Below that it is loamy sand to clay loam. A few gullies 4 to 20 feet deep are in areas once cultivated. Included with this land in mapping are small areas of Sampson loam, Bresser sandy loam, 1 to 3 percent slopes, and Sandy alluvial land. This land is well drained. Permeability is mod- erate, and available water capacity is moderate to high. Runoff is medium. The erosion hazard is mod- erate to high. This land is flooded, usually every year, or at least once every 3 to 5 years. Effective rooting depth is more than 60 inches. This land has no beneficial seasonal high water table. All of the acreage is in native grass and is used for grazing livestock. (Capability unit Vlw -1; Overflow range site) Loamy Met Alluvial Land Loamy wet alluvial land (Lw) is in swales and on creek bottoms in the southern part of the Area. Slopes are 1 to 5 percent. These areas are long and narrow. This land type is stratified. The surface layer is a sandy loam to light clay loam about 20 inches thick. The underlying material ranges from clay to sand in texture and ordinarily is stratified. Included with this land in mapping are areas of Sandy wet alluvial land. Creek channels, small springs, and marsh areas are also included. This land is poorly drained. Permeability is moderately slow, and available water capacity is moderate to high. Runoff is slow. The erosion haz- ard is slight where vegetation is permanent, but it is high where the land is bare as a result of flooding. This land ordinarily is flooded once a year, and not less than once in 5 years. The sea- sonal high water table is at a depth of less than S feet, and it may be at the surface in spring. Live springs are near the bottom of the slope in some swales. Most of the acreage is in meadow and is used for hay and pasture. It is not suitable for cultivation (Capability unit Vw -l; Mountain Meadow range site) Stony Steep Land, Cold Stony steep land, cold (Sw) is in the cooler, southern part of the Area (plate VII, bottom). Slopes are 9 to 65 percent. The areas are long stringers on hillsides along the edges of table- lands. Most of them exceed 100 acres in size. Cliffs 10 to 100 feet high are common, and many boulders up to 20 feet in diameter are scattered on the slopes below cliffs. Deep canyons and drainage ways at the base of slopes are common. This land type has a dark - colored surface layer of cobbly and stony sandy loam. The underlying material is cobbly and gravelly sandy loam to clay loam. Shale or sandstone is between depths of 20 and 40 inches. Included with this land in mapping are small areas of Kettle - Falcon soils, Stony rough land, am Peyton - Pring- Crowfoot sandy loams, 5 to 25 percent slopes. Surface runoff is rapid, and the erosion hazard is moderate. Soil slippage is common. All of the acreage is in native grass and brush. A few ponderosa pine and Rocky Mountain juniper art present. Mountain - mahogany and Gambel oak are the dominant vegetation. The main uses are grazing of livestock and wildlife habitat. (Capability unit Vlls -1; Stony Loam range site) Stony Rough Land Stony rough land (Su) is on hills or knobs and mesa side slopes in the southern part of the Area. Slopes are 5 to 40 percent. These areas are in narrow bands, but most of them exceed 200 acres in size. About 30 to 90 percent of this land type is covered with rhyolite stone. The surface layer, about 6 inches thick, is a dark - colored flaggy loam. The underlying material, about 24 inches thick, is a flaggy to gravelly clay loam or sandy clay loam. Rhyolite is between depths of 20 and 40 inches. Included with this land in mapping are areas of Fondis clay loam, 3 to 9 percent slopes, that are on the highest part of the landscape and on mesa tops. Also included on the lower part of slopes are areas of Peyton- Pring- Crowfoot sandy loams, 5 to 25 percent slopes. Rhyolite crops out in areas less than 2 acres in size. Permeability is moderate, and available water capacity is low. Runoff is rapid. The erosion hazard is slight to moderate. Soil slippage takes place on the steeper slopes. All of the acreage is in native vegetation con- sisting of grass, mountain - mahogany, and Gambel oak. It is used for grazing livestock and wildlife habi- tat. This land is a good source of rhyolite for building stone (plate VII, top). Some areas are mined. (Capability unit VIIs -1; Stony Loam range site)