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

In the 19th century, many people believed that landscapes like the Grand Canyon were shaped by volcanoes and earthquakes. But one American geologist named John Newberry had different ideas.

Though not as famous as Arizona's Grand Canyon, these seven spectacular ... and undergo a slightly different formation process. While erosion naturally plays a role in creating gorges as wind ...

And rather than being fully marine, these sequences were formed in a varied ... are a reminder that science is a process. He concluded: "Our work in the Grand Canyon—one of the world's most ...