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After the 767-ka caldera-forming eruption of 650km3 of rhyolite magma as the Bishop Tuff, 90–100km3 of similar rhyolite erupted in the west-central part of Long Valley caldera in as many as 40 batches spread over the 110,000-year interval from ~750ka to ~640ka. Centrally, this Early Rhyolite (ER) is as thick as 622m, but it spread radially to cover much of the caldera floor, where half its area is...
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