"The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling ... the team has determined that the traditional model of this process—developed from ...

and above that you have these beautiful horizontal layers that form the buttes and peaks that you associate with the Grand Canyon." The difference between those two types of rocks is significant.

"Scroll Down through History" displays the layers of rock exposed within the Grand Canyon and shows when in earth's history they formed. The region where the Grand Canyon now lies begins to shift ...

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 ...

A long geologic record (spanning almost 2 billion years, in total) is on display in the layers of the Grand Canyon thanks to the work of the Colorado River. But many creationists instead assert ...