These are the Adelaide , Belcher , Blackhawk and Timper soils. Adelaide soils have a buried argillic horizon and an indurated duripan within 40 inches. Belcher soils have semi- consolidated lacustrine sediments within 20 inches. Blackhawk soils lack a Bqk horizon. Timper soils lack a Bqk horizon above the duripan and have cambic horizons above the duripan that is dominantly silt loam.
Truhoy soils are on fan piedmonts.
These soils formed in alluvium from mixed rock sources. Slopes are 2 to 30 percent. Elevations are 5,400 to 6,400 feet. The climate is cool, arid with warm, dry summers and cool, moist winters. These are the Wardenot and Izo series.