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Andrus
"Three coalescing trachytic shield volcanoes with a combined volume of 252 cu km formed during the Miocene along a north-south line in the Ames Range of western Marie Byrd Land. The youngest and best exposed of the three is Mount Andrus, the southernmost volcano, where late-stage volcanic activity resumed during the late-Pleistocene or Holocene (Gonzalez-Ferran and Gonzalez-Bonorino 1972, LeMasurier and Thomson 1990). A distinct 4.5-km-wide caldera truncates the summit of Mount Andrus. Weak fumarolic activity was observed in 1977 at Mount Kauffman, the northernmost volcano, which also has a morphologically distinct 3-km-wide summit caldera."  -Smithsonian Volcano Archive
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