Sugden, a geologist at the University of Edingburgh, was trying to date an ancient volcanic eruption in East Antarctica when he and his colleague uncovered the old ice.

• 瑟顿是爱丁堡大学的一名地质学家，他和他的同事揭开了古冰层，并正试图确定南极洲东部的一座古火山的爆发时间。