Old Plain
Several hundred thousand years ago, the east and west mesas formed a broad plain through which the Rio Grande flowed about 250 feet or 24 meters higher than its present level.
The surface of this old plain is preserved in various locations - on the western edge of Kirtland Air Force Base and Albuquerque International Airport and along along portions of Coors and Edith Boulevards.
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Descent into the Inner Valley
