Wood at a settlement in Canada's Newfoundland that was cut with metal tools helped researchers pinpoint when the Norse first reached the continent — well before Columbus.
“Previously the date was based only on sagas — oral histories that were only written down in the 13th century, at least 200 years after the events they described took place,” she said. The scientific key to the exact date that the Norse were there is a spike in a naturally radioactive form of carbon detected in ancient pieces of wood from the site: some cast-off sticks, part of a tree trunk and what looks to be a piece of a plank.
Trees “breathe” carbon dioxide as they grow, and so the researchers used that radioactive carbon signature to determine which of the annual growth rings seen in cross-sections of the wood was from 993, Kuitems said. The Norse voyages to Newfoundland are mentioned in two Icelandic sagas, which indicate L’Anse aux Meadows was a temporary home for explorers who arrived in up to six expeditions.
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