View of the western Grand Canyon and the Colorado River from the canyon bottom. New data suggests most of this portion of the canyon was carved by 70 Ma, more than 60 Ma earlier than generally ... more 
View of the western Grand Canyon and the Colorado River from the canyon bottom. New data suggests most of this portion of the canyon was carved by 70 Ma, more than 60 Ma earlier than generally believed. less 
1 / 1
LiveScience.com | Photo By Rebecca Flowers
Thu, Apr 11, 2013 2:10 PM EDT