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In 2017, a team of researchers published a discovery that shook the foundations of archaeological timelines. At a site near San Diego, California, scientists uncovered 130,000-year-old mastodon bones that showed signs of deliberate breakage. Nearby, they found large cobblestones with wear patterns suggesting they had been used as hammerstones and anvils—tools commonly associated with early human activity.

Until this find, the earliest widely accepted evidence of humans in North America dated back to about 15,000 years ago. But the spiral fractures in the mastodon bones, along with the distinct impact marks on the stones, suggested something far more ancient. Radiometric dating using uranium-thorium methods placed the site at roughly 130,700 ± 9,400 years ago, raising the astonishing possibility that humans or human relatives could have reached North America over 100,000 years earlier than previously believed.

This discovery, detailed in Nature by Holen et al. (2017), has stirred intense debate. Critics argue that natural forces could have broken the bones and displaced the rocks. However, proponents point to the clear evidence of targeted bone breakage and tool use, implying purposeful activity. If confirmed, it would mean that an unknown hominin species crossed into North America during a time when it was thought to be uninhabited.

While the identity of the toolmakers remains unknown, some scientists speculate that Denisovans or Neanderthal-like hominins could have reached the continent long before Homo sapiens. Ongoing analysis and future discoveries may one day confirm or challenge this radical rethinking of the human story.

Fun Fact: One mastodon femur at the site showed a fracture pattern similar to bones broken with large stone hammers in controlled experiments today, pointing to deliberate processing.

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#AncientHistory #EarlyHumans #Paleontology #Mastodon #Archaeology #PrehistoricLife #ControversialFinds

#FossilDebate #HumanOrigins