Photo: Grand Canyon Millions of Years Older Than Thought?

Email to a Friend << Back to Full Story


The Colorado River cuts through limestone cliffs in the Grand Canyon.

Caves in cliffs like these harbor rock formations whose makeup is leading some scientists to conclude that parts of the canyon are much older than previously thought.

Photograph courtesy John Doug Powell/Science

MOST VIEWED NEWS

2012: Six End-of-the-World Myths Debunked

APOCALYPSE PICTURES: 10 Failed Doomsday Prophecies

PICTURES: "Extraordinary" Ancient Skeletons Found
NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

Today's National Geographic Photo of the Day

• Today's Photo

• Download as Wallpaper

50 Drives of a Lifetime

National Geographic Traveler has scoured the globe for the world's most beautiful, interesting, and off-beat road trips. Dive in to get drive directions, quizzes, photos, and more.