
Simplified map of volcanic fields in the western US that have been active during the Quaternary. http://geosphere.geoscienceworld.org/content/13/2/391/figures-only
Simplified map of volcanic fields in the western US that have been active during the Quaternary. http://geosphere.geoscienceworld.org/content/13/2/391/figures-only
Lava Flow next to the Colorado River, Grand Canyon. https://answersingenesis.org/blogs/georgia-purdom/2014/06/07/the-grand-canyon-and-my-comfort-zone/