The C horizon is slightly alkaline to strongly alkaline. Few to common redox features are in some pedons. These are the Demky and Walke series. Demky and Walke soils have a mollic epipedon less than 20 inches thick and typically have carbonate at shallower depths. Stickney soils are on the broad nearly level areas on glacial till plains.
Surfaces are plane to slightly concave.
Slope gradients typically are 0 to 3 percent, but range from 0 to 6 percent. The soils formed in calcareous clay loam or loam glacial till. Mean annual air temperature ranges from 45 to 50 degrees F, and mean annual precipitation ranges from 17 to 24 inches. These are the Beadle , Clarno , Dudley , Houdek , Jerauld , Prosper , and Tetonka soils. Beadle, Clarno, and Houdek soils do not have a natric horizon and are on higher parts of the landscape.