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
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Colorado Plateau
All posts tagged Colorado Plateau
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/
A view from the southeast to the northwest across the Valle Grande and Redondo Peak. Image: from 2011 Nature article.
Spica