MLRA 113 - Central Claypan Areas Illinois and Missouri 28,670 km2 (11,030 mi2)

Soils:
Most of the soils are Aqualfs. They have a deep, medium textured surface layer and a fine textured and moderately fine textured subsoil. These soils have a mesic temperature regime, an aquic moisture regime, and montmorillonitic mineralogy. In areas in Missouri are nearly level, poorly drained Albaqualfs (Putnam series) and gently sloping, somewhat poorly drained Ochraqualfs (Mexico and Leonard series). On some sites in Illinois are nearly level Albaqualfs (Cisne, Cowden, and Wynoose series). Somewhat poorly drained, nearly level and gently sloping Hapludalfs (Bluford and Hoyleton series) and moderately well drained, nearly level and gently sloping Fragiudalfs (Ava series) are on loess-covered old till plains. Well drained and moderately well drained, moderately sloping to steep Hapludalfs (Armstrong, Gara, Keswick, Lindley, and Weller series in Missouri and Hickory series in Illinois) are on side slopes. Fluvaquents (Belknap, Piopolis, and Westerville series) and Udifluvents (Sharon series) are in silty alluvium. Haplaquolls (Wabash series) are in clayey alluvium on narrow flood plains of small extent.

12/16/98