During the last glacier age 10,000 to 25,000 years ago, sluggish rivers of Arctic ice created a temporary land crossing between Siberia and Alaska at the Bering Strait. Anthropologists have long agreed that this intercontinental bridgewhich vanished when the glaciers meltedwas crossed by the earliest known North American settlers, who moved far down the continent in search of game (stone spearheads 100 centuries old were unearthed in Folsom, N. Mex., in 1926). Last week, to the existing evidence of the ice-age migration from Asia, a Columbia University anthropologist added an important new find: the oldest Alaskan campsite yet found on the...
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