Mottling is mostly inherent to the parent material. These are the Cavo , DeGrey , Dwight , Farmsworth , Mosher , and Wood River series. Cavo, DeGrey, Mosher and Wood River soils have mollic epipedons less than 20 inches thick. Dwight soils are moist for longer periods in the SMCS and have mean annual soil temperatures of more than 52 degrees F. Farmsworth soils have less than 15 percent fine sand or coarser. The Dudley soils formed in calcareous glacial till on upland till plains and in upland foot slopes.
Surfaces typically are plane to slightly concave.
Slope gradients typically are 0 to 3 percent but range from 0 to 6 percent. Mean annual air temperature ranges from 45 to 52 degrees F, and the mean annual precipitation ranges from 17 to 26 inches. These are the Beadle , Clarno , Crossplain , Davison , Houdek , Hoven , Jerauld , Prosper , Stickney , and Tetonka soils. Beadle, Clarno, Crossplain, Davison, Houdek, Prosper, and Tetonka soils do not have a natric horizon. Beadle, Clarno, and Houdek soils are on higher upland landscapes.