Near the type location, average annual air temperature is about 59 degrees F., and mean annual precipitation is about 54 inches. These are Bewleyville , Sengtown , Dickson , Guthrie , Hawthorne , Sango and Taft series. Sengtown soils have a fine-textured subsoil and greater than 15 percent fragments Dickson, Sango, Taft, and Guthrie soils, on adjacent landscapes, have fragipans. Hawthorne soils, on steeper ridges and hillsides, are loamy-skeletal. Most areas are used for growing hay, pasture, small grains, cotton, corn, and tobacco.
Some areas are in woodland consisting chiefly of oak, hickory, gum, and maple.
The Highland Rim of Tennessee, northern Alabama, Pennyroyal of Kentucky, and possibly southern Missouri. The series is of large extent.