This horizon is slightly alkaline or moderately alkaline. The Ab horizon has colors similar to the Bw horizon. It is silt loam through clay with a clay content of 25 to 50 percent and a reaction similar to the Bw horizon. Where the Ab or C horizon has less than 35 percent clay, it occurs at depths of 35 to 60 inches below the surface. Where present, the C horizon is similar in color, and reaction to the Bw horizon.
Texture includes clay, silty clay, clay loam, silty clay loam, and silt loam.
It contains thin, dark or light colored strata of loamy and sandy material. Some pedons contain gypsum crystals. These are the Deleon series of the same family, and the Ashport , Frio , Krum , Mangum , Moreland , Nukrum , Port , Rioconcho , Roebuck , Spur , Trinity , and Volente series. Ashport, Port, and Spur soils have less than 35 percent clay in the textural control section and COLE less than 0.07. Frio and Volente soils have a COLE of less than 0.07, and are warmer.