The C horizon has few or common accumulations of gypsum in fine nests and seams. It ranges from slightly alkaline to strongly alkaline. This is the Bullcreek series. Bullcreek soils contain salts in the solum. Promise soils are level to strongly sloping on uplands, colluvial fans, and terraces.
Slopes are typically long and plane or slightly concave.
Slope gradients range from 0 to 15 percent. Gilgai microrelief is in most areas. The soil formed in clay sediments weathered from clay shales. Mean annual air temperature ranges from about 45 to 50 degrees F, and precipitation from about 15 to 24 inches. These are the competing Bullcreek soils and the Chantier , Dupree , Hurley , Labu , Lakoma , Millboro , Opal , Sansarc , Verdel and Witten soils.