قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Controversial theory of the disappearance of glacial animals, supported by new evidence

Controversial theory of the disappearance of glacial animals, supported by new evidence



  Woolly mammoths

Did the alien impact cause the disappearance of glacial animals? University of South Carolina archaeologist finds evidence in South Carolina to support controversial theory.

A contradictory theory, suggesting that an alien body crashed on Earth nearly 13,000 years ago, caused the extinction of very large animals and the likely decline in early humans population. traction from research sites around the world.

The hypothesis of the impact of the younger Dryas, contradicting its presentation in 2007, suggests an asteroid or comet hit the Earth about 1

2,800 years ago, causing a period of extreme cooling that contributed to the extinction of more than 35 megafauna species, including giant sloths, saber-toothed cats, mastodons and mammoths. It also coincides with a severe decline in early human populations, such as the Clovis culture, and is thought to have caused massive fires that could block sunlight, causing an "impactful winter" at the end of the Pleistocene era.

  White Lake Sampling

University of South Carolina archaeologist Christopher Moore (second from right) and colleagues collect baseline samples from White Lake near Elgin, South Carolina to look for evidence of impact or asteroids , which may have caused the disappearance of large glacial animals such as saber-toothed cats and giant sloths and mastodons. Credit: University of South Carolina

In a new study published this week in Scientific Reports published by Nature the archaeologist of the University of South Carolina Christopher Moore and 16 colleagues have presented to Cos. impact based on studies done at White Lake near Elgin, South Carolina. The study is based on similar findings from platinum spikes – an element associated with space objects such as asteroids or comets – in North America, Europe, West Asia and more recently in Chile and South Africa.

"We continue to find evidence and expand geographically. In the last few years, numerous documents have been released with similar data from other sites that almost universally support the notion that there was an extraterrestrial impact or a comet outbreak that caused the young Dryas climate event, "says Moore. [19659009] Extracting core samples "width =" 225 "height =" 400 "srcset =" https://scitechdaily.com/images/Extracting-Samples-from-Core-225×400.jpg 225w, https: / /scitechdaily.com/images/Extracting-Samples-from-Core-768×1365.jpg 768w, https://scitechdaily.com/images/Extracting-Samples-from-Core-576×1024.jpg 576w, https://scitechdaily.com /images/Extracting-Samples-from-Core.jpg 1440w "sizes =" (max-width: 225px) 100vw, 225px "/>

Main samples of White Lake near Elgin, South Carolina, show evidence of platinum spikes and soot showing impact from an asteroid or comet Credit: University of South Carolina

Moore is also a leading author of previous North American paper documentary sites, where platinum spikes were discovered and co-authored several other documents documenting elevated platinum levels in archeological sites, including Pilaco, Chile – the first discovery of evidence in the Southern Hemisphere.

"First, we decided it was an event in the North America, and then in Europe and elsewhere, there was evidence that this was an event in the Northern Hemisphere. And now with research in Chile and South Africa, it looks like it may have been a global event, "he says.

In addition, a team of researchers found unusually high concentrations of platinum and iridium in the leachate of a recently discovered crater in Greenland, which could be the point of impact. Although the crater is not exactly dated yet, Moore says it is a good possibility that it is the "smoking tool" that scientists are looking for to confirm the space event. In addition, data from South America and elsewhere suggest that the event may have involved multiple blows and airstrikes across the globe.

While the brief return to the conditions of the Ice Age during the young Dryas was well documented, the reasons for it and the decline of human populations and animals remained unclear. The impact hypothesis has been proposed as a possible trigger for these abrupt climate changes, which lasted about 1400 years.

The event of young Dryas derives its name from the wild flowering, Dryas octopetala, which can withstand cold conditions and suddenly became common in some parts of Europe 12,800 years ago. The marine hypothesis about the impact of Dryas has become controversial, Moore says, because the overarching theory is that the cosmic impact that causes cascading events leading to extinction has been viewed as unbelievable by some scientists.

"It was bold in the sense that it was trying to answer a lot of really difficult questions that people have been facing for a long time with one stroke," he says, adding that some researchers remain critical.

The conventional view is that the failure of glacial dams allowed the massive release of fresh water into the North Atlantic, which affected the ocean's circulation and made the earth submerge in cold climates. The young Dryas hypothesis simply states that cosmic impact was the trigger for the impulse of melted water in the oceans.

In studies at White Lake in South Carolina, Moore and his colleagues used a main barrel to extract sediment samples from under the pond. The samples, dating to the beginning of younger radiocarbon dating, contain a large platinum anomaly consistent with discoveries from other sites, Moore says. A large soot anomaly has also been detected in the cores of the site, showing regional scale fires in the same time span.

In addition, fungal spores related to manure from large herbivores have been found to decrease early in the younger ones. The Dryas period, suggesting a decline in the megafauna during the glacial period beginning during the impact.

"We speculate that the impact contributed to the disappearance, but this was not the only cause. Climate change has almost certainly contributed to the hunt for humans, "says Moore. "Some of these animals survived the event, in some cases centuries. But from White Lake Disputes and elsewhere, it appears that some of them disappeared at the start of Young Dria, possibly as a result of environmental disruption caused by impact-related fires and climate change. "

Further evidence found at other sites in support of extraterrestrial impact includes the detection of melt, microscopic spherical particles and nanodiamonds, indicating that there is sufficient heat and pressure to merge materials to the earth's surface. Another indicator is the presence of iridium, an element associated with space objects that scientists have also discovered in rock layers dating back 65 million years ago to the effects that caused dinosaurs to disappear.

Although no one knows for sure why the Clovis people and the iconic Ice Age beasts have disappeared, the studies of Moore and others provide important clues as the accumulation of evidence to support the hypothesis of the impact of young Dryas.

"It's a big debate, it's been going on for a long time," Moore says. "Such things in science sometimes take a very long time to gain widespread recognition. This is true of the disappearance of dinosaurs when the idea that an impact killed them was suggested. It was the same with plate tectonics. But now these ideas are a fully established science.

Reference: "Sediment cores from White Lake, South Carolina, contain platinum anomaly, pyrogenic carbon peak, and coprophilic spore decline at 12.8 ka" by Christopher R. Moore, Mark J. Brooks, Albert K. Goodier, Terry A. Ferguson, Angelina G. Perrotti, Siddharth Mitra, Ashlyn M. Listetsky, Bailey K. King, David J. Mullinson, Chad S. Lane, Joshua D. Cap, Alan West, David L. Carlson, Wendy S. Wolbach, Theodore R. Them II, M. Scott Harris and Sean Pyne-O & # 39; Donnell, October 22, 2019. , Scientific reports .
doi: 10.1038 / s41598-019 -51552-8


Source link