Grand Canyon’s age revised, again
Triceratops and Tyrannosaurus rex never peered over the Grand Canyon’s steep slopes
![grand canyon](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/06/ticker_GC_free-1.jpg?fit=860%2C460&ssl=1)
YOUNG AT HEART New geologic comparisons suggest that the Grand Canyon is less than 12 million years old.
Moyan Brenn/Flickr (CC BY 2.0)