The Rocky Mountains begin in northern New Mexico, where the axial crystalline rocks rise to 12,000 ft (3,700 m) between the horizontal structures of the plains on the east and the plateaus on the west. The upturned stratified formations wrap around the mountain flanks of the range, with ridges and valleys formed on their eroded edges and drained southward by the Pecos river to the Rio Grande and the Gulf of Mexico.
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