Grand Canyon is one the world's most spectacular geologic features. Our interactive map of Grand Canyon is available for all at http://rclark.github.io/grand-canyon-geology/ . The geology was mapped by George Billingsley and his colleagues at the U.S. Geological Survey. Ryan Clark, formally at AZGS, stitched the maps together.
Photographer: US Geological Survey Staff
Photo Date: circa 2000
Photo Location Accuracy: Approximately Located
Photo Tags: Grand Canyon, geotourism, Colorado River, Proterozoic, Paleozoic, Permian 
