phreatomagmatic Click the image to see the original photo at maximum resolution (potentially large files). Click the title to see a full description, geolocation, and more. Photos 1 - 5 of 5 azgs_photo Colton Crater, San Francisco Volcanic Field azgs_photo Central Hopi Buttes volcanic field, northern Arizona azgs_photo Maar volcano of the San Bernardino volcanic field azgs_photo Palagonitized Tuff at Colton Crater, San Francisco volcanic field azgs_photo Red Mountain Cinder Cone
