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The pollen 14C age and oxygen isotopic composition of siliceous sinter deposits from the former Beowawe geyser field reveal evidence of two hydrothermal discharge events that followed relatively low‐magnitude (<M5) earthquakes of Holocene and late Pleistocene age along the Malpais fault zone in Whirlwind Valley, Nevada, USA. The observed 20‰ trend of decreasing δ18O over about a 5000‐to‐7000‐year...