These are the Cuerda , Pinamt , Rositas and Tremant soils. Pinamt and Tremant soils have an argillic horizon. Rositas soils are sandy. Cuerda soils have an irregular organic carbon distribution with depth. Dateland soils are used for livestock grazing and wildlife habitat.
Vegetation is big galleta, creosotebush, white bursage, ocotillo and cholla.
The soils are moderately extensive. MLRA is 31 and 40.