"Little is known of this isolated volcano that was seen in eruption by Darwin. Corcovado, probably of late-Pleistocene age, is eroded by glaciers and surrounded by Holocene cinder cones. A series of lakes flank the eastern side of the basaltic to basaltic-andesite volcano. Eruptions in historical time were considered likely from these postglacial volcanoes (Moreno 1985, pers. comm.). Darwin observed activity from the Corcovado area in 1834, and an eruption was reported to have occurred in November 1835."  -Smithsonian Volcano Archive
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