The Bullflat series consists of very deep, well drained soils formed in silty alluvial-colluvial materials from sedimentary rocks on open prairies in mountains.
Permeability is moderate.
Slopes range from 0 to 15 percent. When described, the soil was moist to 32 inches and dry below. Depth to carbonates typically is 12 to 22 inches, but ranges from 10 to 34 inches. Bt horizons and 15 to 50 percent by volume in the C horizon. Depth to consolidated bedrock typically is greater than 60 inches, but ranges from 40 to 60 inches in some pedons.