These are the Atlow , Boomstick , Checkett , Gabbvally , Hooplite , Olac , Old Camp , Phliss , Rowel , Soughe , Stewval , and Thike series. Atlow soils are moderately to strongly alkaline in the argillic horizon and lack evidence of secondary silica. Boomstick, Olac and Soughe soils are noncalcareous in all parts. Checkett, Hooplite, and Stewval soils are calcareous in all parts. Gabbvally soils are noncalcareous throughout and have average annual soil temperatures of 53 to 59 degrees F. Old Camp soils receive summer moisture in the form of convection storms.
Phliss soils are calcareous in all parts of the argillic horizon and lack secondary silica.
Rowel soils have an argillic horizon with 40 to 55 percent clay. Thike soils have less than 18 percent clay in the argillic. Cottle soils are on summits, shoulders, and backslopes of foothills at elevations of 2,800 to 5,100 feet. These soils formed residuum and colluvium from welded rhyolitic tuff and related rocks. Slopes range from 2 to 40 percent.