The Peotone series consists of very deep, very poorly drained soils formed in colluvial sediments in depressional parts of till plains.
Permeability is moderately slow.
Slope gradients are less than 2 percent. Mean annual air temperature is about 50 degrees F., and mean annual precipitation is about 33 inches. Peotone silty clay loam - on a slope with less than a 1 percent gradient in a cultivated field at an elevation of 707 feet. 40 degrees 48 minutes 58 seconds N. and long. 88 degrees 12 minutes 02 seconds W., NAD 27.