Maverick soils are Aridisols. Zapata soils are loamy and have a petrocalcic horizon within 20 inches of the soil surface. Caid, Catarina, Knippa, and Uvalde soils are on similar positions. Maverick and Zapata soils are on slightly higher positions. Moderately well drained.
Permeability is very slow.
Surface runoff is low on 0 to 1 percent slopes and medium on 1 to 3 percent slopes. Water enters the soil rapidly when it is cracked, but very slow when the soil is moist and cracks are closed. Largely used for native rangeland. Range vegetation consists mainly of fourflower trichloris, alkali scaton, tobosa, vine mesquite, curlymesquite, white tridens, whiplash pappusgrass and other short and midgrasses. Nonsaline areas produce pink pappusgrass, sideoats grama, and buffalograss also.