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The Rio Grande Rift
April 13, 2012 | New Mexico Bureau of Geology and Mineral Resources

“The river’s course through southern Colorado and New Mexico is controlled by a geologic feature known as the Rio Grande rift, which formed when Earth’s crust stretched and thinned in an east-west direction starting about 36 million years ago (36 Ma). The stretching and thinning of the crust allowed hot mantle to well upward, creating youthful volcanoes, hot springs, and mineral deposits, as well as forming a topographically low area along which the river flows.”


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