First Americans Arrived No Earlier Than 21,000 Years Ago, DNA Suggests
A new study of ancient DNA indicates that the ancestors of modern Native Americans first arrived in the New World not earlier than about 21,000 years ago, at the very end of the last Ice Age and the coldest period of Earth’s history. These findings have added more fuel into the long-standing debate in archaeology, and they sit in a stark contrast to the 23,000-year-old human footprints at White Sands in New Mexico, suggesting that people might have already been in America before that wave of migration.
Three Timelines, One Contentious Question
Since the late 1800s, researchers have argued over whether humans entered the Americas before, during or after the Last Glacial Maximum (LGM), the frigid peak when vast ice sheets locked up much of the planet’s water between roughly 25,000 and 19,000 years ago. Writing in Current Opinion in Genetics & Development, Bethany Potter of the Kansas Geological Survey, Savannah Hay of the University of Kansas and their colleagues Jennifer Raff and Amy Singh weighed three competing models against the genomic record: a pre-LGM entry more than 25,000 years ago, a migration between 20,000 and 14,000 years ago, and a later arrival after 14,000 years — the old ‘Clovis First‘ position that dominated textbooks for decades.
www.Ancient-Origins.net – Reconstructing the story of humanity’s past
Source: https://www.ancient-origins.net/news-evolution-human-origins/first-americans-dna-21000-years-old-00103233
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