Much has been learned about the geology of the Grand Canyon and about ... layer was deposited not by the sea, but by wind, which blew in sand across the region. Fossils found in these layers ...

the topmost layer of rock in the Grand Canyon, was formed at the ocean's bottom. However, it is now located up to 9,000 feet above sea level. This layer contains numerous marine fossils ...

Photos of the fossil — yes ... built up in a giant freshwater lake at the base of the Grand Wash cliffs right when the Grand Canyon started to form.” Response to the post has been muted ...

"The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling the ... hard shells rapidly proliferated and sea levels rose to envelop continents with ...