Time to scrap the idea that humans arrived in the Americas by land bridge – Ars Technica

…[T]o get from Beringia to the Americas, humans would had to pass through the ice free corridor, which could not have supported a mass human migration on foot until at least 12,500 years ago, when the area had enough animals and vegetation for the humans to use as food and shelter. Before 12,500 years ago, the area was largely a sterile landmass, still recovering from its millennia beneath the ice sheets.

Humans probably did take the Bering Land Bridge to the Americas after 12,500 years ago, but they would have arrived on a continent that was already populated with people who came along the Pacific coast thousands of years before. While it may sound improbable that humans could take boats along the coast from Asia, consider that humans arrived in Australia by boat, island hopping from Asia about 50,000 years ago. Boat technology is one of our most ancient inventions, and it would have worked admirably for people who were using the vessels to go short distances along the coast, carrying supplies. Considered in this light, humans reached the Americas partly because they had developed fairly sophisticated transportation technology. The first Americans were maritime peoples who came across the ocean rather than plodding across the land.

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