A new study has revealed the formation of the Grand Canyon may be tied to the creation of another Arizona landmark.

The National Park Service is defending its handling of a lightning-sparked wildfire that destroyed the nearly century-old ...

Geology is full of detective stories about the Earth's history, and a new paper in Geology by University of New Mexico ...

Here's what's open and closed at Grand Canyon North Rim, South Rim and Phantom Ranch in the wake of wildfires that destroyed the North Rim lodge.