Walk out over the Grand Canyon to peer thousands of feet downward into the red cliffs, enjoying some of the most dramatic ...

Rare fossils found along the Colorado River 'give us a fuller picture of what life was like during the Cambrian period,' says ...

GRAND CANYON, Ariz. — When I first peered into the layer cake that is the Grand Canyon several years ago, I was surprised to spot a continuous strip of green between a grayish section and a red-brown ...

The United States has a habit of showcasing its geology. Long before cities and highways showed up, forces beneath the ...

I love the Grand Canyon, both personally (because of all the good memories I have of my adventures there), and as a scientist. I first saw it in the early summer of 1981 when I went on a six-week-long ...

Starting out on a six-day series of wilderness hikes in the Grand Canyon on unmaintained trails where even a minor misstep can cost you your life is probably not the best time to discover you’re ...

The Grand Canyon in northern Arizona is a favorite for astronauts shooting photos from the International Space Station, as well as one of the best-known tourist attractions in the world. The steep ...

How old is the Grand Canyon? Most scientists agree with the version that rangers at Grand Canyon National Park tell visitors -- that the 10-mile wide chasm in northern Arizona was carved by the ...

Grand Canyon backcountry permits: https://www.nps.gov/grca/planyourvisit/backcountry-permit.htm U.S. Geologic Survey explanation of Grand Canyon geology: http ...