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 ...

is the youngest of Grand Canyon’s layers. “The Kaibab Formation formed in shallow, warm seas about 270 million years ago, a bit before dinosaurs roamed the earth,” the publication says.

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

Hells Canyon might be deeper than the Grand Canyon, but it's barely 2 million years old, according to a new study.

On Tuesday, OSU announced that it will face Grand Canyon at PHX Arena in Phoenix next ... with both the Sooners and Sun Devils on the slate later in the year. "Jerry Colangelo has made a lasting ...

Palo Duro Canyon placed in the 10 best state parks in the United States in the USA TODAY 10BEST Readers' Choice Awards. See ...

With such ancient history, there are tales and myths to be told as we walked through the swirling sculpted corridors ...

These flat terraces can end up covered with river sediments, and scientists have ways of figuring out how long the layers ... the Grand Canyon's youngest stretches are about 5 million years ...

I don't want to downplay it. Grand Canyon's a big day, for sure, but this was completely out of the blue." Park Service warns hikers about extreme heat Every year the National Park Service warns ...