These are the Kalona , Lanyon , Marna , Streator , and Waldorf series of the same family and the Carlow , Darwin , Lura , Wabash , and Zook series. Kalona soils are less acid and typically have less than 5 percent sand in the solum. Lanyon soils have a much thinner sola and free carbonates at shallow depths. Streator soils are less acid in the upper 30 to 50 inches and formed in loess. Zook soils have a thicker mollic epipedon and are less acid.
Chequest soils are on bottom lands.
Slopes range from 0 to 2 percent. They formed in acid, moderately fine-textured alluvium that contains about 5 to 15 percent sand. Mean annual temperature is about 47 to 54 degrees F, and mean annual precipitation is about 30 to 34 inches. The competing Carlow , Wabash , and Zook soils and the Coppock , Humeston , and Vesser soils are common landscape associates. Coppock soils lack a mollic epipedon and are fine-silty.