Abstract
The upland surface of the Guadalupe Range and three younger erosion surfaces in the Pecos lowland record progressively lowered base levels during the Pliocene and Pleistocene. Structurally, transverse consequent drainage in the range is attributed to superposition from a Pliocene (Ogallala) cover uplifted by block-faulting. Carlsbad and other caverns antedate the present topography and are believed to be related to a pre-Ogallala cycle of erosion.
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