Description: From Jicha (2009): "Four experiments on two samples (KON-07-01 and -02) of a clinopyroxene-phyric basaltic andesite flow along the southern shoreline gave a weighted mean 40Ar/39Ar age of 15.2+/-5.0 (2 sigma) (Figs.2-4 [in original text]).This lava flow contains large (>1 cm) augite megacrysts similar to those found in the basalts of Roundhead volcano on Kanaga Island ~250 km to the west (Brophy and others, 1999)."
"40Ar/39Ar age determinations indicate that it is a young stratovolcano that emerged above sea level at ~15.2 ka."