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Wednesday, December 13, 2017

The second traces in the history of mass extinctions discovered in the Arctic


Traces of mass extinction of flora and fauna that occurred over 370 million years ago, paleontologists found the island a Pillar, not far from the station “Samoilovsky” in the Lena Delta. As reported by Nikolay Sennikov, Deputy Director of the Institute of petroleum Geology and Geophysics. A. Nikolay, this is the first case when the traces of the extinction has been found in the Arctic.


photo: pixabay.com

Earlier traces of the so-called Devonian extinction,one of the pulses which is called “event Quellwasser” was found in Germany and Morocco, but now a group of Russian specialists and their foreign colleagues have found them on the skeleton Post, work on which is reportedly underway already for about 15 years.

The discovery is expected to allow a better understanding of what caused the extinction and, in particular, to test the hypothesis that the event Quellwasser brought a change in ocean currents and in the water large amounts of hydrogen sulfide.

Just in Earth’s history highlights five major mass extinctions. The first of these, the Ordovician-Silurian, occurred 440 million years ago — at the time, disappeared more than 60% of species of marine invertebrates. The Devonian extinction, traces of which were discovered by experts happened 76 million years ago and led to the reduction in the number of species of marine organisms by about half. Another 113 million years has been the so-called “great” Permian extinction that led to the disappearance of more than 95 percent of terrestrial species and more than 70 percent of land vertebrates. 50 million years later (that is, nearly 200 million years ago) occurred Triassic extinction, which died out, at least half the currently known species existing on Earth at that time. Finally, the Cretaceous-Paleogene extinction that occurred 65.5 million years ago. Although it destroyed “only” the sixth part of which existed in the period of biological species, it remains the most well-known — perhaps including the fact that the face of the Earth the dinosaurs disappeared.

Still experts are not sure nor what was the cause of each of the above extinctions, nor can they be linked in any cyclic event.

source

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