Boone soils typically have a Cr horizon of sandstone with colors like the C horizon described above. These are the Carver , Hooksan , Tarr , and Tint series. Related soils are the Plainbo and Twinmound series. None of these soils except Plainbo and Twinmound have a paralithic contact within 60 inches. Plainbo soils have 10 percent or more weatherable minerals in the particle-size control section.
Twinmound soils are frigid.
Boone soils are on hills in bedrock controlled uplands. Slopes range from 0 to 70 percent. Mean annual precipitation ranges from 28 to 33 inches. The frost free period ranges from about 135 to 160 days. Elevation ranges from 700 to 1400 feet.