A comet DID wipe out first North American prehistoric humans: Ice core data suggests cosmic impact killed off Clovis people
2013 08 07
By Ellie Zolfagharifard | Mail Online
A cosmic impact 12,900 years ago could have led to the demise of the ‘Clovis’ people of North America, researchers claim.
A layer of platinum from an ice core taken in Greenland has been dated back to the time of a known abrupt climate transition, known as the ’Big Freeze’.
The freeze has been previously been linked to the demise of the Clovis people, the prehistoric hunter gatherers who were the first to occupy North America.
According to researchers at Harvard University, this provides evidence that a comet tipped the world into its colder phase, making dozens of species extinct.
Researcher Michail Petaev and Harvard colleagues, writing in the journal Proceedings of the National Academy of Sciences, found a 100-fold increase in platinum concentration in ice that is around 12,890 years old.
This is the same period for which oxygen isotope measurements show rapid cooling of the climate- a period known as the ‘Younger Dryas’.
The Younger Dryas, or the ‘Big Freeze’, saw a rapid return to glacial conditions in the higher latitudes of the Northern Hemisphere between 12,900–11,500 years.
Researchers claim that debris thrown into the atmosphere in an impact may have tipped the Earth into global cooling, wiping out native cultures such as the Clovis people.
As evidence for the rapid Clovis depopulation, comet theorists had previously pointed out that very few Clovis archaeological sites show evidence of human occupation after they died out.
At the few sites that do, Clovis and post-Clovis artifacts are separated by archaeologically sterile layers of sediments, indicating a time gap between the civilisations.
They believe that the sediment is a ‘dead zone’ in the human archaeological record in North America, beginning with the comet impact and lasting about 500 years.
Read the full article at: dailymail.co.uk
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