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 term ”Grand Canyon” was first used by John Wesley ... Most of the rock that forms the canyon is composed of sedimentary layers that form only at the bottom of the ocean.

"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 ...

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 ...

"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 ...