These are the Atlas , Bluford , Darmstadt , Grantfork , Hickory , Hosmer , Hoyleton , Marine , and Ursa soils. Atlas and Ursa soils formed in the strongly developed paleosol in the till and are downslope from the Blair soils. Bluford, Darmstadt, Hosmer, Hoyleton, Marine, and Stoy soils are upslope from the Blair soils where the loess is thicker. Bluford soils contain more clay in the control section and have fragic properties in the lower part of the solum. Darmstadt soils have a natric horizon.
Hosmer soils have fragic properties in the lower part of the solum.
Hoyleton and Marine soils contain more clay in the control section. Grantfork soils have a concentration of exchangeable sodium in the subsoil and contain more fine sand and coarser sand in the control section. They are on adjacent or nearby parts of the landscape. Hickory soils formed in till and contain more sand in the control section. Somewhat poorly drained.