Bethalto, Emery, Franklin, and Millbrook soils do not contain carbonates at depths less than 40 inches. Mulvey soils contain greater than 15 percent coarse fragments in the lower part of the series control section. The Wauconda soils are on lake plains or outwash plains of Wisconsin age. Slopes range from 0 to 5 percent. The soils formed in 20 to 40 inches of silty material and in the underlying stratified calcareous outwash.
Climate is continental.
Summer is hot and winter is cold. These are the Aptakisic , Grays , Mundelein , and Pella soils. Aptakisic and Mundelein soils are on similar landforms. Aptakisic soils have lighter colored surface layers and Mundelein soils have a mollic epipedon. The moderately well drained Gray soils are on higher positions on the landform.