Kyle, Twotop, and Swanboy soils do not have shale within depths of 40 inches. Larvie soils do not have visible salts near the surface. In addition, Larvie soils have redder hue in the lower part of the profile. Wasa soils have salts above depths of 8 inches and have a more dispersed surface. Winler soils are on nearly level to sloping uplands.
Slopes are dominantly smooth and plane.
Slope gradients range from 0 to 15 percent. Gilgai microrelief is in most areas. The soil formed in clayey residuum weathered from clay shale. Mean annual air temperature ranges from 45 to 48 degrees F, and mean annual precipitation ranges from 14 to 16 inches. These are the competing Kyle , Swanboy , and Wasa soils and the Hisle , Lismas , and Pierre soils.