Broomfield soils have sandy clay shale at depths of less than 40 inches. Clyde, Colwood, Letri, Lyles , Selma, Tripoli, Webster, and Rensselaer soils contain less clay in the lower part of the solum and the C horizons. Faxon soils have limestone bedrock at depths less than 40 inches. Gansner soils are in high mountain valleys. Kossuth soils have more clay and less sand in the upper part of the solum.
Wolcott soils have less clay and more sand in the lower part of the solum and substratum.
These soils are on nearly level to slightly undulating topography. The slope gradient is usually less than 1 percent but ranges from 0 to 2 percent. Mean annual temperature is about 51 degrees F. Mean annual precipitation is about 33 inches near the type location. These include the Andres , Elliott , Mokena , and Symerton soils. Andres soils are somewhat poorly drained.