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+--- Thread: Grand Canyon's age contentious (/showthread.php?tid=52)
Grand Canyon's age contentious - Skywise - 01-28-2014
http://www.livescience.com/42842-grand-canyon-old-and-young.html
Grand Canyon's Age? A Mix As Wild As the West
The Colorado River took the easy route when it carved the Grand Canyon through Arizona's ruddy sandstones and pastel limestones, a new study claims.
Instead of slicing through thousands of feet of unblemished rock, the Colorado River recycled ancient canyons, at least one of which was 70 million years old, researchers report today (Jan. 26) in the journal Nature Geoscience.
"I think the Colorado River found low places and paleocanyons and ancient topographies that led to the Grand Canyon," said Karl Karlstrom, lead study author and a geologist at the University of New Mexico in Albuquerque.
Rest of story at link.
Brian