 This was an example of an upland marsh, which resulted in a high incidence of malaria before the late nineteenth century.The topography of Champaign County was formed by the Wisconsin Glacier about 20,000 years before the present.Lobes of ice from what is now Lake Michigan crossed the county, creating a deep pile of glacial soil, up to 300 feet thick, topped by numerous moraines forming small, flat watersheds with no outlets.