"Sedimentary rocks are hard to date" said Crossey "but ... More information: Carol Dehler et al, The Cambrian of the Grand ...

A research team outlines how it identified and bestowed a moniker upon a previously unexplored 500 million-year-old Grand Canyon formation: The Frenchman Mountain Dolostone. The newly named rock ...

The Grand Canyon. A fresh analysis of rocks exposed in the side of the canyon ... a gradual deepening and corresponding changes in sedimentary environments. According to the team, however, instead ...

"The Tonto Group holds a treasure trove of sedimentary layers and fossils ... "And we're helping to further decode it. Because Grand Canyon rocks record global changes in climate and tectonics ...