These are the competing Flagg and Ogle soils and the Argyle , Pecatonica , and Westville soils. Myrtle soils are the intermediate member of a biosequence with the well drained Flagg and Ogle soils on similar landscapes. Argyle, Pecatonica, and Westville soils have thinner loess mantles and are on nearby landscapes. In addition, the Pecatonica and Westville soils have surface layers less than 6 inches thick that have moist color value of 3 or less. Runoff is medium or rapid.
Permeability is moderate.
The Myrtle soils are used mostly for cultivated crops such as corn, small grain, and meadow crops. Some areas are used for pasture. Native vegetation was probably mixed prairie grass and hardwood trees. Known extent is small but is nearly moderate. Stephenson County, Illinois, 1969.