Nevo soils ar 5 to 10 inches to a lithic contact and contain 25 to 33 percent clay. Phliss soils have secondary line in the argillic horizon. Rowel and Soughe soils are 25 to 35 percent clay in the argillic horizon. In addition Rowel soils have a mean annual soil temperature of 53 to 57 degrees F. Stewval soils are 4 to l4 inches deep to a lithic contact and are effervescent throughout. Thike soils are 5 to 14 inches deep to a lithic contact and are 12 to 18 percent clay in the particle-size control section.
Fortyday soils are on basalt ridges and plateau side slopes.
Slopes are 0 to 60 percent. Elevation is 500 to 2,200 feet. These soils are formed in residuum and colluvium from basalt with small additions of loess and are commonly located on southerly aspects. Summers are warm and dry and winters are cool and moist. The average annual precipitation is 6 to 9 inches.