繁体中文  
 
版主:x-file
 · 九阳全新免清洗型豆浆机 全美最低
 
Native American tribe may have been wiped out by a
送交者:  2017年03月14日18:28:56 于 [世界游戏论坛] 发送悄悄话

Native American tribe may have been wiped out by asteroid – study

Native American tribe may have been wiped out by asteroid – study
The Clovis people were a prehistoric Native American culture that existed roughly 13,200 to 12,900 years ago who suddenly died out at the end of the last Ice Age, along with 35 iconic species of animals with little or no explanation as to why – until now.

A team of three archaeologists at the University of South Carolina recently published a study which looked at 11 dig sites across North America and found elevated levels of platinum in very specific soil layers.

“The presence of elevated platinum in archaeological sites is a confirmation of data previously reported for the Younger-Dryas onset several years ago in a Greenland ice-core,” Christopher Moore, the lead author of the study, told the Archaeology News Network.

READ MORE: 125,000yo skull fragments may have belonged to little known extinct human species, Denisovans

This ‘Younger-Dryas’ period is best known as one of extreme cooling that began around 12,800 years ago and lasted for roughly 1,400 years.

This period coincided with the end of the Clovis culture and the extinction of over 35 species of Ice Age animals, including woolly mammoths, mastodons and saber-tooth tigers. But why would they die out if they had already managed to survive through an ice age

“Platinum is very rare in Earth’s crust, but it is common in asteroids and comets,” Moore said.

READ MORE: Mass extinction: Vatican embraces science to fight biggest threats to humanity

In other words, North America may well have witnessed an extinction-level event similar to the one that killed the dinosaurs, but one third of its size.

“It is continental in scale – possibly global – and it's consistent with the hypothesis that an extraterrestrial impact took place," Moore added.

While the scope of the current research has only determined the presence of anomalous platinum at multiple dig sites, it does provide a logical hypothesis that warrants further study.

Additional research could also help to identify potential impact craters responsible for the mass extinction.


0%(0)
0%(0)
标 题 (必选项):
内 容 (选填项):
实用资讯
北美最大最全的折扣机票网站
美国名厂保健品一级代理,花旗参,维他命,鱼油,卵磷脂,30天退货保证.买百免邮.
一周点击热帖 更多>>
一周回复热帖