Pierre, Wasa, and Winler soils are on steeper landscapes above the Twotop soils. Swanboy soils are on similar landscapes. Hisle soils are in similar landscape and have a natric horizon. Lismas soils are on nearby steep landscapes and have shale within 20 inches of the surface. Runoff is medium to very high on sloping areas and low on nearly level areas.
Permeability is very slow.
Native vegetation is mainly western wheatgrass and montana wheatgrass. Green needlegrass is in some areas. Western South Dakota and eastern Wyoming. The series is of moderate extent. Butte County, South Dakota, 1970.