Adair and Lamoni soils are on convex slopes below Clarinda soils. Seymour soils are on convex slopes above Clarinda soils. Clearfield, Grundy, Marshall, and Sharpsburg soils formed in loess on higher and generally less sloping positions in the landscape and are better drained than the Clarinda soils. Shelby soils formed in clay loam glacial till on slopes below the Clarinda soils and have a brownish colored B horizon. Runoff is medium or rapid.
Permeability is very slow.
These soils are seasonally wet and seepy. Depth to an intermittent perched water table is 0 to 1 foot at some time from November through July in most years. These soils are used for pasture and cultivated crops. Corn, soybeans, small grains, and hay are the principal crops. Native vegetation was prairie grasses.