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Humans could have taken a coastal road to America



Ancient American colonizers could have traveled the Alaskan Pacific coast in canoes or other seagoing vessels some 17,000 years ago, a new study finds.

At that time, towards the end of the last Ice Age, the glaciers were just returning from a group of southern Alaskan islands, say geologist Alia Lesnek from the University of Buffalo, New York and her colleagues. Life preserver habitats was soon after the ice has melted, the researchers report in May 30 Science Advances

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The study deals with the debate over the spread of the New World after arriving in Asia to Florida and South America 14,500 years ( SN: 6/11/16, p. 8 ; SN: 12/26/15, p. 10 ) The work has suggested that a domestic, ice-free corridor from Alaska through present-day British Columbia and to the United States may not have contained enough vegetation and wildlife to allow travel around 12,600 years ago (19459005] SN Online: 8/10 / 16 ). New geological evidence support the idea of ​​a coastal route, even though Lesnek's team found no human bones or artifacts on the islands.

Measures of chemicals that accumulate in the rock due to cosmic rays as soon as glaciers retreat Estimates when four islands in Alaska reach their ice mists Likely, there is an open path for coastal travelers along the entire southeastern coast of Alaska around 17,000 years ago, scientists say. Radiocarbon dates for the remains of a ringed seal found on a southern Alaskan island indicate that the seal lived about 17,000 years ago, suggesting that the area became habitable soon after leaving the glacier


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