"Tolguaca is a late-Pleistocene to Holocene stratovolcano located immediately NW of Lonquimay volcano. Only fumarolic activity has occurred from basaltic-andesitic Tolguaca during historical time. A NW-SE zone of aligned summit craters is youngest to the NW. Another group of vents cutting the south and east flanks is oriented SW-NE, parallel to the zone of flank vents on nearby Lonquimay volcano, and is of postglacial age (Moreno and Gardeweg 1989). Reports of eruptions in 1876 and on January 7, 1933, have not been confirmed. The latter date probably refers to an eruption of Lonquimay or Llaima volcanoes (Petit-Breuilh 1994, pers. comm.). The glacially eroded surface of Tolguaca contrasts with its neighbor of similar height, Lonquimay, and attests to its older age."  -Smithsonian Volcano Archive
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