They lack an argillic horizon. Feltonia soils are on fans below the Gelkie soils and they have a thicker mollic epipedon, more sand, and a calcic horizon. Silvercliff soils are on terrace escarpments and side slopes below the Gelkie soils. They have more than 35 percent coarser fragments and a calcic horizon. These soils are used principally for rangeland.
Native vegetation consists of Arizona fescue, mountain muhly, and some western wheatgrass.
When the range deteriorates blue grama, Kentucky bluegrass, and fringed sage are common. Central and southern Colorado, and northern and western Wyoming. The series is of moderate extent, having more than 30,000 acres. The Orofino series needs further study. Rock fragments overlap.