The well drained Harvard, Martinsville, and Ockley soils are on similar landforms. In addition, Harvard soils form a biosequence with the Camden soils and have a dark colored surface layer. The well drained St. Charles soils are on nearby landforms and have a thicker loess mantle. The poorly drained Sexton soils and the somewhat poorly drained Starks soils form a drainage sequence with Camden soils and are on lower lying areas. The potential for surface runoff is negligible to high.
Permeability is moderate.
Native vegetation is mixed hardwood forest. Schuyler County, Illinois, 1930. A sandy substratum phase, flooded phase, moderately wet phase, and till substratum phase are recognized. These soils will be evaluated during MLRA updating to determine if new series are needed.