The ancient supercontinent Rodinia may be responsible. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A mystery lies deep within the Grand ...

A proposal to build an asphalt plant at a longtime gravel quarry in Forestville has set off a fierce local battle, with more than 700 residents warning it could pollute waterways, fuel wildfires and ...

FLAGSTAFF, Ariz. — It’s something like a modern-day chuckwalla, strolling in sand dunes on an island in what now is the Grand Canyon region. That’s how Steve Rowland, professor emeritus of geology at ...

A view of the Grand Canyon showing rock layers from above bright against a blue cloudy sky - Dusty Roads/Shutterstock The bizarre but beautiful Grand Canyon is a place of impressions. Who can fail to ...

In Colorado’s canyon country, the best spring surprises often appear where pavement gives up and curiosity takes over. By May ...

The Interior Department is facing a lawsuit from a Christian geologist who claims he was not allowed to collect rocks from Grand Canyon National Park because of his creationist beliefs. The Interior ...

As I walk the trail between cliff and river, I search again for the face. It’s 10 inches tall. The eyes and mouth are distinctly pecked, two antenna rise above the head. I almost walk past it, and ...

Many of the large boulders that tumbled down the steep slopes and gullies of Glenwood Canyon across Interstate 70 and into the Colorado River during last summer’s record rainstorms are set to be put ...