There’s a new theory about what helped form one of America’s grandest natural wonders - The key to solving a nearly 7 billion-year-old geological mystery could be microscopic ...

A new collaborative study led by the U.S. Geological Survey provides strong evidence that the Grand Canyon was carved out by ...

Researchers say the ancestral Colorado River formed an ancient lake in northern Arizona roughly 6.6 million years ago, which spilled out westward onto the landscape that would eventually become the Gr ...

The study says the Colorado River took a convoluted path as it carved the canyon — and got help from an ancient lake.

If you’re thinking of traveling to high-altitude parks in Southern Nevada, Utah and northern Arizona, you may need to change your plans. Record snow in the Southwest has resulted in delayed openings ...