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. The frost-free season ranges from l30 to l95 days. These are Kiona , Lizzysprings , Onepennee , Bakeoven , Prosser , Shano , Sohappy and Starbuck soils. The Kiona on ridges, Lizzysprings on ridges, Shano on uplands and Sohappy soils on hillslopes are deep. The Prosser soils are on benches and are 20 to 40 inches deep.