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	Home : Earth Science : Geology : Plate Tectonics : Active Tectonics and Mountain Building : Western Cordillera (North America) LINKS: Tectonic History of Western North America Animations of plate movement for the western U.S. by Tanya Atwater for several time intervals (85 million years BP to Present, 38 million years BP to Present, and 20 million years BP to Present (BP means Before Present). http://www.geol.ucsb.edu/~atwater/Animations/ (Added: Tue Feb 18 2003)
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