Slopes are plane to slightly convex and gradients are mostly 0 to 1 percent. The soils formed in alluvium of medium and moderately fine particle size. Unless protected, flooding occurs at intervals ranging from one to two times each year to once in 4 to 10 years. Mean annual temperature ranges from 57 to 70 degrees F. Average annual precipitation ranges from 23 to 40 inches, and the Thornthwaite P-E indices from 36 to 64. These are the Bunyan and Deleon series.
Bunyan soils lack mollic epipedons.
Deleon soils have more than 35 percent clay in the control section. Dominantly used for improved pastures and pecan orchards. Some areas are cultivated to alfalfa, small grains, cotton, forage sorghums, and oats. Native vegetation is elm, hackberry and pecan trees, with little bluestem, switchgrass, indiangrass, perennial wildrye, and white tridens. The soil is of moderate extent.