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Read the new paper raptor & fix your long standing 2000 year error! ~~~~ |
Removed silly POV word. The only arguing is by the one or two researchers that are pushing this nonsense hypothesis that has been completely debunked. LOL. |
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The '''Younger Dryas impact hypothesis''' or '''Clovis comet hypothesis''' is the [[hypothesis|hypothesized]] large [[air burst]] or earth [[impact event|impact]] of an object or objects from [[outer space]] that initiated the [[Younger Dryas]] cold period about 12,900 [[Before Present|BP]] [[Radiocarbon dating#Calibration|calibrated]] (10,900 BP uncalibrated) years ago.<ref name="PNAS07A">{{cite journal |author=Firestone RB, West A, Kennett JP, ''et al.'' |title=Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=104 |issue=41 |pages=16016–21 |year=2007 |month=October |pmid=17901202 |pmc=1994902 |doi=10.1073/pnas.0706977104 |url=|bibcode = 2007PNAS..10416016F }}</ref><ref name=Bunch>{{cite journal |author=Bunch TE, Hermes RE, Moore AM, ''et al.'' |title=Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago |journal=Proc Natl Acad Sci U S A |volume= 109|issue= 28|pages= E1903–12|year=2012 |month=June |pmid=22711809 |doi=10.1073/pnas.1204453109 |url=|bibcode = 2012PNAS..109E1903B }}</ref> The hypothesis has been largely challenged by research that
The hypothesized impact event scenario stated that the air burst(s) or impact(s) of a swarm of [[Chondrite#Carbonaceous_chondrites|carbonaceous chondrites]] or [[comet]] fragments set areas of the [[North American]] continent on fire, causing the [[Quaternary extinction event|extinction of most of the megafauna]] in [[North America]] and the demise of the North American [[Clovis culture]] after the [[last glacial period]].<ref name= "Kennett"/> The Younger Dryas ice age lasted for about 1,200 years before the climate warmed again. This swarm is hypothesized to have exploded above or possibly on the [[Laurentide Ice Sheet]] in the region of the [[Great Lakes]], though no impact crater has been yet identified. An airburst would have been similar to but orders of magnitude larger than the [[Tunguska event]] of 1908. The hypothesis proposed that animal and human life in North America not directly killed by the blast or the resulting coast-to-coast [[wildfire]]s would have likely starved on the burned surface of the continent.
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