Afton soils have thicker darker surface layers and gleyed B horizons. Marcus and Primghar soils are downslope in swales or upslope on upland flats. Afton soils are downslope in drainageways. Galva and Sac soils are on similar landscape positions. Surface runoff is medium.
Permeability is moderate.
Most areas are cultivated. Native vegetation was tall grass prairie. Galva soils are extensive. Published data are available for the Galva series. See Foth, H. D. and Riecken, F. F., 1954.