The regolith is sandy marine sediments. Average annual precipitation is 55 inches, and average annual air temperature is 73 degrees F. or more near the type location. These are the competing Myakka , Smyrna , and St. Johns series and the Basinger , EauGallie , Immokalee , Placid , Pomello , Tocoi , Wabasso , and Wauchula series. EauGallie, Tocoi, Wabasso, and Wauchula soils have an argillic horizon. Immokalee soils have A horizons more than 30 inches thick.
Placid soils have an umbric epipedon and are wetter.
Pomello soils have a thick A2 horizon and are better drained. Ona soils are poorly drained. Permeability of the Bh horizon is moderate. The water table is at depths of 10 to 40 inches for periods of 4 to 6 months during most years. It rises to depths of less than 10 inches for periods of 1 to 2 months, and may recede to depths of more than 40 inches during very dry seasons.