Abstract
In western Presidio and Jeff Davis Counties of Trans-Pecos Texas there lies a long mountain range paralleling the Rio Grande and extending toward the Big Bend of that river. On recent maps the range is designated as the Tierra Vieja Mountains, but on early geological maps it bears the name Sierra Vieja or Sierra Vieja Mountains. Consistency in the use of Spanish would suggest the name Sierra Tierra Vieja, old earth mountain, and the range will thus be referred to in this paper.
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