A couple more presentations on volcanic themes from the current Geological Society of America 2009 Fall Meeting in Portland, Oregon (18-21 October 2009). Magmatic plumbing of a ’supervolcano’ exposed to a depth of 25 km (James E. Quick, Southern Methodist University) – the exposure through uplift of a Permian caldera in the Sesia Valley (PDF) reveals the magmatic plumbing system to 25 km depth. (More about this here at The Volcanism Blog , at Eruptions , and at Outside The Interzone
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