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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Llano Estacado

  Close-up of
 Llano Estacado
The Llano Estacado, Spanish for "Staked Plains," of western Texas and eastern New Mexico marks the southernmost extent of the Great Plains. One of the largest expanses of near-featureless terrain in the U.S., it is an uplifted surface of porous, intact late Tertiary river sediments with a veneer of late Quaternary wind-blown sand. The region was named by Spanish explorers who placed stakes in the ground to mark their trail since the region lacks any discernible landmarks.