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 calcareous and moderately alkaline throughout and have pronounced gilgai microrelief. Moderately well drained. Runoff is medium.
Permeability is slow.
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. Southern Blackland Prairie and Southern Claypan Area of South Central Texas. The series is of moderate extent.