Dark concretions range from none to common. Some pedons contain thin strata and fracture coatings of sand. These are the Benchley series in the same family and the similar Coy , Durant , Elmendorf , Foraker and Tabor series. Benchley soils lack Cr horizons, Durant, Foraker, and Tabler soils have lower mean annual soil temperatures and shorter growing seasons. These soils are formed in sediments that do not contain tuffaceous materials and are assumed to have significant physical and chemical differences that are not totally understood at this time.
Flatonia soils are on gently sloping uplands.
They formed in clayey and loamy alkaline tuffaceous sediments of the Catahoula and associated formations of Tertiary Age. Slopes are smooth to slightly convex. Slope gradients range from 0 to 5 percent. Mean annual precipitation ranges from 32 to 40 inches and mean annual temperature ranges from 67 to 70 degrees F. Frost free days range from 260 to 290 days and elevation ranges from 200 to 550 feet. Thornthwaite P-E indices ranges from 42 to 60.