Home Topics in Depth Science And Environment Earliest Human Presence in North America Dated to the Last Glacial Maximum:24k y

  • Ichingcarpenter (2956 posts)
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    Earliest Human Presence in North America Dated to the Last Glacial Maximum:24k y

    Earliest Human Presence in North America Dated to the Last Glacial Maximum: New Radiocarbon Dates from Bluefish Caves, Canada

     

    Abstract
    The timing of the first entry of humans into North America is still hotly debated within the scientific community. Excavations conducted at Bluefish Caves (Yukon Territory) from 1977 to 1987 yielded a series of radiocarbon dates that led archaeologists to propose that the initial dispersal of human groups into Eastern Beringia (Alaska and the Yukon Territory) occurred during the Last Glacial Maximum (LGM).

     

    This hypothesis proved highly controversial in the absence of other sites of similar age and concerns about the stratigraphy and anthropogenic signature of the bone assemblages that yielded the dates. The weight of the available archaeological evidence suggests that the first peopling of North America occurred ca. 14,000 cal BP (calibrated years Before Present), i.e., well after the LGM.

     

    Here, we report new AMS radiocarbon dates obtained on cut-marked bone samples identified during a comprehensive taphonomic analysis of the Bluefish Caves fauna. Our results demonstrate that humans occupied the site as early as 24,000 cal BP (19,650 ± 130 14C BP).

     

    In addition to proving that Bluefish Caves is the oldest known archaeological site in North America, the results offer archaeological support for the “Beringian standstill hypothesis”, which proposes that a genetically isolated human population persisted in Beringia during the LGM and dispersed from there to North and South America during the post-LGM period.

     

    http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169486

     

     

     

     

     

     

     

    HoosierDeb, PADemD, Mom Cat and 7 otherscanoeist52, Johnny Rash, 7wo7rees, HeartoftheMidwest, Enthusiast, , Lynetta like this

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7 replies
  • Lynetta (591 posts)
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    1. Interesting but they are using date codes I am unfamiliar with-dinosaur here.

  • night (163 posts)
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    2. BP, what the hell is that

  • ThouArtThat (2260 posts)
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    3. BP = Before Present – That Is Now

    eom

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    • night (163 posts)
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      5. so, every year

      that comes, the BP labels get adjusted by 1…

  • Enthusiast (5369 posts)
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    6. This is fascinating to me.

    People were eating horses and caribou in the Yukon 24,000 years ago. The evidence appears to be very solid.

    "The NSA’s capability at any time could be turned around on the American people, and no American would have any privacy left, such is the capability to monitor everything. There would be no place to hide."  Frank Church
  • Ichingcarpenter (2956 posts)
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    7. The Last Glacial Maximum

    The Last Glacial Maximum (LGM) was the last period in the Earth’s climate history during the last glacial period when ice sheets were at their greatest extension. Growth of the ice sheets reached their maximum positions in about 24,500 BCE. Deglaciation commenced in the Northern Hemisphere gradually between approximately 18,000 to 17,000 BCE and in Antarctica approximately 12,500 BCE, which is consistent with evidence that it was the primary source for an abrupt rise in the sea level in about 12,500 BCE.[1]

    Vast ice sheets covered much of North America, northern Europe, and Asia. The ice sheets profoundly affected Earth’s climate by causing drought, desertification, and a dramatic drop in sea levels.[2] It was followed by the Late Glacial.

    https://en.wikipedia.org/wiki/Last_Glacial_Maximum