Minnith soils have a mean annual soil temperature greater than 55 degrees and the sand fraction in the lower part is well sorted, poorly graded. Redbud soils average less than 15 percent sand in the lower part of the series control section. Zurich soils have carbonates above 40 inches and formed in loess and the underlying outwash. The Eleroy, Jeneva, Middletown, Newvienna, Richview, and Rockfield series have not been updated for the addition of cation exchange activity class to their taxonomy. These series may or may not compete when their taxonomy is updated.
Elco soils are on side slopes and some ridge tops on loess covered till plains and moraines.
Slope gradients are 1 to 25 percent. These soils formed in 20 to 40 inches of loess and in the underlying till that contains a strongly developed paleosol. Most pedons have a layer of silty or loamy pedisediment between the loess and till. Mean annual temperature ranges from 46 to 54 degrees F, and mean annual precipitation varies from 32 to 40 inches. These are the Atlas , Fayette , Hickory , Ursa , and Winfield soils.