Caspiana, Deepwater, Mason Mer Rouge, Newtonia, and Tiptonville soils have a solum more than 60 inches thick. Catoosa, Claremore, and Clareson soils have a solum less than 40 inches thick. In addition, Clareson soils have a clayey-skeletal control section. Dardanelle soils do not have bedrock within 60 inches of the surface. Fitzhugh and Okay soils have a fine-loamy control section.
Nowata soils have a loamy-skeletal control section.
Lula soils are on nearly level to gently sloping ridgetops or summits of the uplands in the Cherokee Prairies. Slopes are 0 to 5 percent. They formed in material weathered form limestone of Pennsylvanian age. Mean annual precipitation ranges from 37 to 45 inches. Mean annual temperature ranges from 57 to 64 degrees F. Thornthwaite annual P-E indices is more than 64.