Hooplite soils are 18 to 25 percent clay in the particle-size control section and have slight or strong effervescence in the argillic horizon. Olac and Soughe soils lack silica coatings on fracture planes. Old camp soils have carbonates on coarse fragments in the lower part of the argillic horizon. Phliss soils are moderately alkaline throughout and effervescence increases with depth. Rowel soils have an abrupt textural change and an argillic horizon with 40 to 55 percent clay.
Stewval soils are calcareous throughout.
Thike soils have less than 18 percent clay in the argillic. Nevo soils are on ridgetops and benches and have slopes of 3 to 45 percent. These soils formed in loess and residuum weathered from basalt. Elevations are 500 to 2,000 feet. These soils are in an arid climate with hot dry summers and cool moist winters.