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
Utah
All posts tagged Utah
Caliente, Nevada, center of a massive ignimbrite flareup some 30 Ma http://plantsandrocks.blogspot.com/2012_10_01_archive.html
agimarc
Spica
Granyia
volcanohotspot.wordpress.com 