Clay percentage of the particle-size control section ranges from 8 to 18 percent. Coarser-textured lenses of coarse sand or fine gravel, less than 4 cm. thick, occur below 28 inches in depth. The mollic epipedon is 10 to 16 inches thick. Reaction is mildly or moderately alkaline. The C and 2C horizons have hues of 10YR, 2.5Y or 5Y, values of 5 through 8, chroma of 0 through 4.
Reaction is moderately or strongly alkaline.
The Alda series may be saturated longer than 90 days during the growing season and the salinity is less than 4 mmhos throughout. Novina, Ovina, and Wann soils lack the coarse sand or gravelly sand above a depth of 40 inches. Sunset soils have a xeric moisture regime. Marksbutte soils are on bottom lands or low terraces. Slopes are 0 to 3 percent.