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

EMAIL NEWSLETTER Photos and News of the Week

Get the top photos and news of the week from National Geographic News, plus occasional breaking-news alerts.

See Sample >>
Please enter a valid email address
Privacy Policy

MOST VIEWED NEWS

Hurricane Gustav to Become Gulf Coast Monster?

Portal to Maya Underworld Found in Mexico?

PHOTO IN THE NEWS: New Giant Fish Species Announced

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

Photo and Headline Widget

Put our latest news and photos on your Web page or desktop—automatically updates! See Sample
Download Widget