The Grand Canyon is a layer cake that tells the geological story of the last two billion years. The canyon gives visitors a rare opportunity to see the distinct layers that form the Earth.
The Grand Canyon is a layer cake that tells the geological story of the last two billion years. The canyon gives visitors a rare opportunity to see the distinct layers that form the Earth. Brad Branan bbranan@sacbee.com
The Grand Canyon is a layer cake that tells the geological story of the last two billion years. The canyon gives visitors a rare opportunity to see the distinct layers that form the Earth. Brad Branan bbranan@sacbee.com

Backpack trip tells geologic story of Grand Canyon

November 23, 2016 08:00 AM