MLRA 108 - Illinois and Iowa Deep Loess and Drift Illinois, lowa, and Missouri 79,790 km2 (30,800 mi2)

Soils:
Most of the soils are Udolls. They are deep, medium textured soils that formed mainly in loess. These soils have a mesic temperature regime, an udic moisture regime, and montmorillonitic or mixed mineralogy. Somewhat poorly drained, nearly level Argiudolls (Flanagan, Ipava, and Mahaska series) and Hapludolls (Muscatine series) and poorly drained nearly level Haplaquolls (Drummer and Sable series), and Argiaquolls (Taintor and Virden series) are on uplands. Well drained and moderately well drained Argiudolls (Sharpsburg, Shelby, and Tama series) are gently sloping to strongly sloping. Well drained Hapludalfs (Fayette, Seaton, Clinton, and Hickory series) on the steep slopes of valley sides make up only 10 to 15 percent of the total area. Somewhat poorly drained Hapludolls (Lawson series), well drained Hapludolls (Huntsville series), and moderately well drained Udifluvents (Nodaway series) are in silty alluvium on the flood plains. Poorly drained and very poorly drained Haplaquolls (Colo and Zook series) are in clayey alluvium on the flood plains.

12/16/98