Cobblestone content ranges from 0 to 5 percent. It is mildly alkaline or moderately alkaline. A till substratum phase is recognized. These are the Andres , Aztalan , Darroch , Gilboa , La Hogue , Le Sueur , Marcellon , Mokena , Nenno , Odell , Protivin , Vigar , and Wilmer series. Andres and Mokena soils contain more clay and less sand and gravel in the lower part of the solum.
Aztalan soils contain less gravel in the B and have more silt and clay in the lower solum.
Darroch, Nenno, and Odell soils have sola less than 40 inches thick. Gilboa soil have less gravel in the lower part of the solum and the lower part of the solum formed in loam till. La Hogue soils contain less gravel in the lower part of the solum and do not have free carbonates above a depth of 60 inches. Le Sueur soils contain less gravel in the lower part of the solum and have formed in loam till. Marcellon soils have sola less than 40 inches thick, contain less gravel in the lower part of the solum, and formed in till.