Geophysical and geologic modeling of Cenozoic basins in Trans-Pecos Texas and southern New Mexico--the Salt Flat, Hueco, Tularosa, Mesilla Valley, Presidio, and Valentine basins--shows north to northwest-trending block faulting. The deep-seated faults could serve as hydrocarbon traps for older Paleozoic and Mesozoic source beds in the area. Interpretations are complicated by the Laramide orogeny and tectonism associated with the formation of the Basin and Range province and Rio Grande rift.

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