Long Valley caldera GIS database:
'via Blog this'
Welded ash formation from the Long Valley caldera's VEI7-scale eruption. USGS photo, pubic domain, via USGS.
USGS image, public domain, via Wikipedia
Bishop (Long Valley caldera) and Yellowstone ashbeds, USGS public domain image, via USGS
Part of the reason I'm so fascinated with these large "super volcano" calderas is the sheer scale of these monsters and their potential for rapid, global climate change. Another is the apparent role they've played in human development: from the Toba eruption that may have given rise to the first racial groups among bands of survivors isolated for hundreds or thousands of years, to the Campi Felgrei event that may have killed much of Europe's neanderthal population and cleared the way for Homo sapiens to dominate that continent.
That role in shaping humankind is one I'm very anxious to get back to addressing in my novel Ashlands--a Great American, Post-Yellowstone road trip novel set around the year 2050. A raft of other projects has pushed that one back repeatedly over the past year.