Scientists were able to set the year a meteorite that caused the beginning of the last glaciation in the history of the planet, according to RIA “Novosti” , citing a study published in the log the American Academy of Sciences. Geologists have found traces of the cataclysm on four continents, and with the help of them have found that this cataclysm occurred 12,835 years ago.
“The exact chronological assessment of this event is very important because in the past we have worked long and hard trying to figure out what caused this mysterious and abnormal cooling. We believe that our work provides a comprehensive answer to this question, and we hope that it will encourage our colleagues used statistical analysis in these investigations “, – said James Kennett (James Kennett) from the University of California at Santa Barbara.
The last cold snap and the subsequent onset of glaciers on Earth happened about 12.9 thousand years ago, this period in the history of our planet known as junior or Younger Dryas. Abrupt climate change is believed to be caused, for example, to the extinction of megafauna in North America – mastodons, giant sloths, megatherium, saber-toothed cats and other species.
Kennett explains, he and his colleague Richard Firestone found the first evidence that this cooling was caused by the fall of an asteroid in 2007, and in sedimentary rocks at the bottom of a lake in Mexico, but their findings did not believe many geologists.
They thought found Kennett and his associates “space” metals and microspheres should not be a meteorite allegedly falling on the territory of the province of Quebec, as the result of some local geochemical processes. If the fall really happened, they wrote, then traces of it in the form of a thin layer of “meteor” species could be found on all continents.
Kenneth and his colleagues conducted excavations in 12 countries in Europe, Asia, Africa and the Americas, and provided evidence of the existence of such a layer. According to the researchers, the likelihood that they are left with the same cataclysm, exceeds 95%, and they believe prove the existence of a meteorite.
Comparing age detected the boundary layers, the authors concluded that the meteorite fall occurred about 12,835 years ago, plus or minus 100 years. Date of almost exactly coincides with the fall of the meteorite, which traces in the form of platinum inclusions were found in Greenland ice.
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