Prosser, Ritzville and Roloff soils are on hills. All of these soils are deeper than 20 inches to a lithic contact. Used for domestic livestock grazing. Native vegetation is bluebunch wheatgrass, Sandberg bluegrass, Idaho fescue, Thurber needleandthread, rabbitbrush, and sagebrush. Central Washington, north-central Oregon, and southern Idaho.
Series is of moderate extent.
Walla Walla County, Washington, 1960. Diagnostic horizons and features recognized in this pedon are an ochric epipedon 9 inches, a cambic horizon from 9 to 16 inches, and a lithic contact at 16 inches.