They form in residuum and colluvium from basalt with small additions of loess. Slopes are 0 to 70 percent. The thickness of solum and depth to bedrock ranges l4 to 20 inches. These soils are usually dry in all parts between a depth of 4 to 12 inches. The particle-size control section averages l8 to 25 percent clay in the fine earth fraction with 35 to 80 percent coarse fragments.
Reaction is neutral to moderately alkaline throughout.
The A horizon has a hue of l0YR or 7.5YR, value of 5 or 6 dry and 3 or 4 moist, and chroma is 2 through 5 dry and moist. The AB or BA horizon has value of 3 or 4 moist, is sandy loam, loam, or silt loam and is very gravelly, gravelly, very cobbly or cobbly with l5 to 60 percent coarse fragments. The Bt horizon has a hue of l0YR or 7.5YR, value of 5 or 6 dry and 3 or 4 moist, chroma is 2 through 5 dry and moist. It is sandy loam, sandy clay loam, loam, silt loam or clay loam which is very gravelly, extremely gravelly, very cobbly or extremely cobbly with 35 to 80 percent coarse fragments. These are the Atlow , Boomstick , Checkett , Cottle , Gabbvally , Hooplite , Nevo , Olac , Old Camp , Phliss , Rowel , Soughe , Stewval and Thike soils.