Elvira soils have redox features with hue redder than 7.5YR in the mollic epipedon and in the upper part of the cambic horizon. Marcus soils average more than 34 percent clay in the surface layer and formed in loess on uplands. Patton soils are on nearly level to depressional parts of stream terraces and glacial lake plains. Slopes are level or slightly concave with gradients of 0 to 2 percent. Patton soils formed in medium textured and moderately fine textured glaciolacustrine deposits and typically are underlain by stratified silty and loamy outwash sediments of Wisconsinan Age.
Some areas are underlain by bedrock and some areas by sandy sediments.
Mean annual air temperature ranges from 52 to 57 degrees F., and mean annual precipitation ranges from 35 to 48 inches. These are the Camden , Harco , Henshaw , Markland , Marissa , McGary , Montgomery , Starks , Uniontown , and Zipp soils. The well drained Camden, Markland, and Uniontown soils do not have a mollic epipedon and have an argillic horizon. They are on nearby higher-lying or more sloping stream terraces. The somewhat poorly drained Harco soils have carbonates at depths less than 40 inches, are on slightly higher parts of stream terraces, and form a hydro-sequence with Patton soils.