These soils formed in slopewash alluvium and residuum from interbedded shales and siltstone and fine grained argillaceous sandstone.
Cushman soils are on buttes, fan remnants, hillslopes, piedmonts, ridges and terraces.
Slopes are 0 to 20 percent. Cushman very fine sandy loam-on south facing slope of about 3 percent under native grass vegetation. 84 W. 44 degrees 56 minutes 53 seconds north latitude and 106 degrees 56 minutes 52 seconds west longitude. Depth to a paralithic contact and bedrock is typically about 28 to 32 inches but ranges from 20 to 40 inches. Depth to continuous horizons of carbonate accumulation is 7 to 23 inches.