Lowry soils have a coarse-silty control section and do not have an argillic horizon, and are on nearby landscapes. Millboro soils contain more clay in the series control section and typically are on landscapes below the Reliance soils. Onita soils have a mollic epipedon more than 20 inches thick and are in swales. Promise soils are in similar nearby landscapes and have a very-fine textured control section. Surface runoff is low to very high.
Permeability is moderately slow.
Most areas are cropped to winter wheat, corn, sorghum, and alfalfa. Native vegetation includes western wheatgrass, green needlegrass, needleandthread, sideoats grama, blue grama, big bluestem, little bluestem, porcupine grass, sedges, and forbs. South-central South Dakota and north central Nebraska. The series is of large extent. Lyman County, South Dakota, 1940.