In addition, Arol and Falba soils have sandier surface layers and more acid subsoils. Carbengle and Frelsburg soils are on similar surfaces and formed over sandstones and clays of the Oakville and Fleming Formations. Bt horizons and have more clayey surface layers. In addition, Greenvine soils are calcarous and moderately alkaline throughout and have pronounced gilgai microrelief. Flatonia soils are moderately well drained.
Permeability is slow and runoff is medium.
Flatonia soils are used mostly for rangeland or pasture. Many of these areas are abandoned fields which have been allowed to re-vegetate. Some areas are in improved species of pasture grasses such as bermudagrass, bluestems and Kleingrass. A few areas are in cropland and are farmed to corn, grain sorghum, small grains, or sudan hybrids. Blackland Prairie of South Central Texas.