Click for Grand Canyon, Arizona Forecast


Rock on

John Wesley Powell declaimed that the Grand Canyon was the best geologic cross section in the world. In fact George Bradley, on Powell's first historic river trip/exploration, complained that "If he can only study geology he will be happy without food or shelter but the rest of us are not afflicted with it to an alarming extent".

A cursory study of the rocks keeps the hiker's mind off mundane matters such as blisters, sore muscles, and heat exhaustion.

geology crosssection

Click on a formation to learn more about it.