The Grand Canyon in US - one of the seven natural wonders of the world - is actually 65 million years older than thought, dating back to the era when dinosaurs roamed the Earth, a new study has found.
Most previous estimates have put The Grand Canyon's age at 5 million to 6
million years, based on the age of gravel washed downstream by the ancestral Colorado River.
However, researchers say it was carved some 70 million years ago - at a time when dinosaurs still roamed the Earth, the 'Daily Mail' reported.
The study led by professor Rebecca Flowers from the University of Colorado Boulder, which used radioactive decay and thermal dating to make their estimate, found it is much older.