National Geographic

Grand Canyon Gorge Is 9 Times Older Than Thought

<table cellspacing="0" cellpadding="1"> <tr> <td valign="top"> <a href="http://news.nationalgeographic.com/news/2008/04/080409-grand-canyon.html"> <img src="http://news.nationalgeographic.com/news/images/thumbs/080409-grand-canyon_60x40.jpg" height="40" width="60" alt="image" /> </a> </td> <td valign="top"> <p>The canyon's Upper Granite Gorge formed 55 million years ago, a new study says, suggesting that the Grand Canyon we see today may be the result of "ancestral" canyons that slowly grew together.</p> </td> </tr></table>