"The low shield volcano forming Marchena Island contains one of the largest calderas of the Gal├ípagos Islands. In contrast to other Gal├ípagos volcanoes, the 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. Its first historical eruption occurred in 1991. Other young lava flows, some of which may be only a few thousand, or even a few hundred years old, filled the caldera and flowed down its outer forested flanks, in some cases to the sea."  -Smithsonian Volcano Archive
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