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

"The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling the Cambrian Explosion some 500 million years ago," paper author and Utah State University ...

"The Tonto Group holds a treasure trove of sedimentary layers and fossils chronicling ... They report their efforts in "The Cambrian of the Grand Canyon: Refinement of a Classic Stratigraphic ...

Musicians write songs about it. Scientists read the history of North America in the layers of its rock walls. The Grand Canyon is one of the Seven Natural Wonders of the World, with other ...

That’s what I kept asking myself as I rode a mountain bike down a rocky trail on sedimentary layers in the Grand Canyon-Parashant National Monument. I was rapidly approaching a lower point on ...

The newly named rock layer has lain hidden in plain sight throughout the Grand Canyon for millennia, but -- until now -- geologists had not named it or studied it in detail. The Grand Canyon is ...

If you have sedimentary rock layers, they are created horizontally, always around the world, like in the Grand Canyon and like here at Big Four Mountain. But if you start following those ...