The Canyon's Age Sparks Fierce Scientific Debate Scientists have spent over a century arguing about when the Colorado River ...

Introducing the Grand Canyon / Stanley S. Beus, Michael Morales -- Precambrian crystalline core / R. S. Babcock -- Grand Canyon Supergroup : Unkar group / J. D. Hendricks, G. M. Stevenson -- Grand ...

A new study reveals that the impact of the Meteor crater may have caused a landslide that flooded the Grand Canyon 56,000 years ago.

When it comes to hiking through Arizona, it's hard not to become some kind of geology expert. I've likened it to someone visiting a foreign country who does not speak the language. After a few weeks, ...

Geology of the older precambrian rocks of the upper granite gorge of the Grand Canyon / R.S. Babcock, E.H. Brown, and M.D. Clark -- The younger precambrian rocks of the Grand Canyon / Trevor D. Ford ...

The Grand Canyon is Arizona's most famous landmark. Here's everything to know if you're going to visit, plus 10 interesting ...

Hike through secret slot canyons, spot endangered California condors, visit sacred Navajo sites, and kayak a stunning 10-mile ...