The moderately well drained Homen soils are typically on less sloping summits, shoulders and backslopes. The somewhat poorly drained, fine-textured Marine soils are on broader, higher lying summits. Depth to an intermittent apparent high water table is 3.5 to 6.0 feet from December to April in most years. Most areas are cropped to corn, soybeans, and wheat. A few areas are pastured or wooded.
Native vegetation is deciduous trees.
St. Clair County, Illinois, 1995. The Ruma series was named for a town in Randolph County. Redoximorphic iron depletions - the zone from 62 to 80 inches. Udic moisture regime.