This early geologic map of a portion of northern Arizona is a product of the U.S. Geological Survey, ca. 1915. Route 66 and later US Interstate 40 adhered closely to the Santa Fe Route.
Photographer: US Geological Survey
Photo Date: 1915
Photo Location Accuracy: Approximately Located
Photo Tags: Santa Fe Route, Route 66, I-40, volcanics, Mount Floyd volcanic field, Seligman, Williams, San Francisco volcanic field, vintage map, geotourism, Natural resource 
