Soft or slightly hard, very friable or friable. Maggie soils have bedrock at a depth of 20 to 40 inches. Stingdorn and Tokoper soils have bedrock at a depth of 8 to 20 inches. Silverbow soils are calcareous in the argillic horizon and have more than 50 percent rock fragments, mainly of stone and cobble size in the Bt horizon. Tomel soils have 3 to 6 inches thick clay loam or sandy clay loam, B2t horizon.
Lyda soils are on fan remnants and fan piedmonts.
Elevations are 5,000 to 6,900 feet. Slopes are 0 to 8 percent. The soils formed in mixed alluvium of dominantly a volcanic sources. These are the Spanel soils and the competing Maggie soils. The dominant vegetation is Bailey greasewood, shadscale, bud sagebrush, winterfat, kochia, galleta, Nevada ephedra, and Indian ricegrass.