Carlson soils contain more carbonate in the C horizon. In addition, Mento soils have 5 to 15 percent exchangeable sodium in the B and C horizons. Kirley soils formed in alluvium. Peno soils have carbonate at depths of 6 to 11 inches. Raber soils are nearly level to strongly sloping on uplands.
Slopes are plane or convex.
Slope gradients range from 0 to 15 percent. Raber soils formed in firm clay loam glacial till. Mean annual temperature ranges from 45 to 48 degrees F, and mean annual precipitation ranges from 17 to 19 inches. These are the Cavo , Demky , Eakin , Gettys , Glenham , Highmore , Jerauld , Oko , and Peno soils. The Cavo, Demky, and Jerauld soils have a natric horizon and are on nearly level to gently sloping areas.