As for the pollen, Sugden says it has never been accurately dated and may come from a much earlier clement period. 至于花粉，萨格登说从未有人精确地测定过它的年代，也许它是源于更早的温和时期。
Sugden, a geologist at the University of Edinburgh, was trying to date an ancient volcanic eruption in East Antarctica when he and his colleagues uncovered the old ice. 爱丁堡大学地质学家萨格登是在南极洲东部设法测定一次古老的火山爆发的年代时与其同事发现的那段古老的冰层。
