Cowden and Oconee soils do not have mollic epipedons and have albic horizons. Cowden soils are on similar nearby nearly level summits and Oconee soils are nearby on low convex ridges or along drainageways. The moderately well drained Harrison soils and the somewhat poorly drained Herrick and Ipava soils are on convex ridges or along the dissecting drainageways and form a hydrosequence with Virden soils. Piasa soils have a natric horizon and an albic horizon and are on nearly level summits nearby. Runoff is slow or ponded.
Permeability is moderately slow.
Most areas are cropped. Corn, soybeans, and small grain are the principal crops. Native vegetation is wet-prairie grasses and sedges. Data from the pedology laboratory, University of Illinois, for several pedons are on file at the Illinois state office. Engineering test data from the Illinois Department of Transportation for several pedons also are on file at the Illinois state office.