Color-coded map illustrating the distribution of volcanic rocks erupted in Arizona over the past 200 million years (Ma). Three Pleistocene-Holocene volcanic remain active and will in all likelihood experience future volcanic eruptions: UI - Uinkaret volcanic field on North Rim of Grand Canyon; FL - San Francisco volcanic field near Flagstaff, Arizona; PI - Pinacate volcanic field on the Arizona-Mexico border.
Photographer: AZGS Staff
Photo Date: circa 2000
Photo Location Accuracy: Approximately Located
Photo Tags: volcanism, geotourism, geologic hazard, Mesozoic, Cenozoic, Plio-Pleistocene 
