A newly published study in GSA Today has upended decades-old theories about how some of the Grand Canyon’s oldest layers — ...

The Cambrian-age Tonto Group is a set of rocks famous for holding clues to the burst of new life that reshaped Earth 500 ...

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

It's a testament to Mother Nature's strength and power, so vast and spectacular that it's often considered the "Grand Canyon of Washington."The Grand Coulee in Washington is an ancient river bed gorge ...

Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

A Washington man considered to be an experienced hiker has died near the end of a 24-mile, rim-to-rim hike at Grand Canyon National Park in Arizona, officials confirmed. Dennis Smith, 74 ...

A 92-year-old man is now the oldest person on record to have conquered the Grand Canyon's 24-mile, rim-to-rim hike. Guinness World Records confirmed the feat on Tuesday, about two months after ...

Enjoy flat walking for about a half mile past manzanita, prickly pear, and agave plants as the trail contours above the floor of Wilson Canyon. Steamboat Rock juts out from the east canyon wall, and ...