Other landforms include plains with hills and open high hills. Lithology and Stratigraphy. Soils in the Cross Timbers region are mainly Ustalfs. Paleustalfs and Haplustalfs are on uplands. Ustifluvents and Haplustolls are on narrow flood plains.
Soils have a thermic temperature regime, a ustic moisture regime, and mixed or siliceous mineralogy.
Soils in the Prairie region are Ustolls, Userts, and Ochrepts. Pellusterts and Chromusterts are on upland valleys. Calciustolls are on smooth uplands. Haplustolls, Calciustolls, and Argiustolls are on areas of limestone parent material. Ustochrepts and Calciustolls occur on steep plateau sideslopes.