When Did the First Humans Move onto North America?

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An image of a mastadon thigh bone
The mastodon thigh bone discovered in San Diego (image credit: San Diego Natural History Museum).

Scientists have re-examined Mastadon bones found in the San Diego area in 1992. They find the bones to be over 100,000 years old. Moreover, the bones appear to have been broken by humans. This means that modern humans may have travelled to North America fare earlier than is commonly accepted, which is about 15,000 years ago.

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When Did the First Humans Move onto North America?
Paul Rincon
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Jesse Rogerson, PhD

As a passionate science communicator, Jesse Rogerson loves promoting science literacy to the public. He frequently represents the Canada Aviation and Space Museum on television and radio, social media, and at conferences. He co-developed a science communication workshop for Canadian science professionals, to instruct them in more effective methods of communicating their science. A trained and practicing astrophysicist, Jesse holds a PhD in observational astrophysics from York University, and recently published a peer-reviewed paper in The Astrophysical Journal. Jesse enjoys riding his motorcycle, board games, and ultimate frisbee.