These are the Delmita , Jimenez , Olmos , and Zapata series. Associated soils will be evaluated in the future to insure proper taxonomic placement. These soils occur on similar surfaces. These soils occur on lower elevations. These soils occur on lower elevations.
Permeability is moderate above the very slowly permeable petrocalcic horizon.
Runoff is low on slopes less than 1 percent, medium on 1 to 3 percent slopes, high on 3 to 5 percent slopes, and very high on slopes greater than 5 percent. Vegetation is a sparse cover of red grama, hairy tridens, threeawn, and Hall's panicum, and woody shrubs including cenizo, catclaw acacia, pricklypear, and some cacti. Classification change from Ustalfic Paleargids to Ustic Petroargids based on application of the second edition of Soil Taxonomy, 1999. The assignment of the cation-exchange activity class is inferred from lab data from surrounding counties in the region.