Anhalt and Crawford soils have hue of 7.5YR and redder and have a lithic contact to limestone bedrock. Crawford, Dalco, Greenvine, and San Saba soils have a fine particle-size control section. In addition, Dalco, Greenvine, and San Saba soils have chroma of 1 to a depth of 12 inches or more. Vertel soils are on gently sloping to strongly sloping uplands. Slopes range from 1 to 12 percent.
Surfaces are convex.
The soil formed in clayey marine shales of the Eagle Ford Formation of Upper Cretaceous Age. Mean annual precipitation is 30 to 42 inches. Mean annual temperature is 64 degrees to 68 degrees F. Frost free days range from 225 to 235. Elevation ranges from 450 to 850 feet above sea level. The Thornthwaite P-E index is 52 to 64.