It is slightly alkaline or moderately alkaline. The Andres, Aztalan, and Mokena soils have silty clay loam lower B and C horizons. Aztalan soils also have hue of 7.5YR in the B and C horizons. Crane soils have more than 8 percent rock fragments in the lower part of the argillic horizon. Darroch soils have C horizons of stratified silty and sandy sediments within the series control section.
Gilboa soils have silt loam and silty clay loam in the upper part of the series control section.
Houstenader soils have 30 to 40 percent gravel in the lower third of the series control section. La Hogue soils have less than 20 percent clay in the lower part of the series control section. Marcellon soils have less than 24 percent clay in the argillic horizon. Nachusa soils do not have rock fragments in the upper part of the series control section. Nenno soils have more than 8 percent rock fragments in the lower part of the series control section.