Dinosaurs escaped the reason for the end of the three -stack of land biostatic incidents

In the early morning of July 2nd, the newspaper Nanjing (Reporter Su Yan Correspondent Ji Zunyu) At the end of the triple -over period of about 20156.4 billion years ago, one of the "five major biological clusters extinction incidents" in geological history occurred, which led to a large number of land and land and land. Marine creatures extinction. However, the dinosaurs avoided this disaster and quickly occupied the main position of the ecological position after the end of the three -stacking creature, dominating the Jurassic and White Clear World. What are the causes of the dirty land biological extinction? Why can dinosaurs survive in the natural disaster of biostatic and develop rapidly after the disaster? These problems have troubled the scientific community for many years.

In recent years, the Nanjing Institute of Geology, the Institute of Geology, Chinese Academy of Sciences, and Dr. Fang Yen, who cooperate with Paul Olson, professor of Columbia University in the United States, and other people in Haojiagou, the Junggar Basin, Xinjiang The Luo Shi strata conducted high -resolution measurement and research, and found that the "volcanic winter" caused by the eruption of the central Atlantic superflinter province was the main cause of the extinction of the terrible land biological extinction at the end of the tri -stack. The reason for the extinction of creatures and occupying Jurassic ecology: It has feathers with thermal insulation and has already adapted to the cold climate. In the early morning of July 2nd, Beijing time, the research results were published online in the internationally renowned journal "Scientific Progress".

How did dinosaurs have been discovered by the cold climate of the polar ground? For the first time, the research team found ice raft deposits in the Junggar Basin to the early Jurassic Lake in the muddy rock in the early Jurassic Lake. This shows that even during the greenhouse and global period of the two poles, there are seasonal frozen. The research team also found the exquisitely preserved dinosaur footprint fossils in the mud rock in the lake. These evidences jointly show that the dinosaurs from the evening of the three stacks to the early Juraki dinosaurs live in polar regions and adapt to the severe cold climate of the polar regions.

According to the system development bracket method, the research team infer that dinosaurs are born with feathers, but these feathers are not used for flying, but for insulation. Prior to the endless biostatic incident of the three -stack, dinosaurs, especially herbivorous dinosaurs, were mainly distributed in medium and high latitudes, while low latitudes were mainly crocodiles of herbs and carnivorous. The research team believes that primitive feathers with thermal insulation function can ensure that grass -eating dinosaurs resist the cold winter of mid and high latitudes, and then enjoy the rich and stable plant resources of the medium and high latitudes. Plant resources in low latitudes are changing and unstable. Dinosaurs have not been able to compete for fake crocodiles with lower metabolic rates due to higher metabolic rates. Fake crocodiles cannot go to medium and high latitudes because they have no feathers.

For a long time, the scientific community generally believes that the eruption of the Central Atlantic Super Fire Rock Province is the main cause of the triad -stacked biostatic incident. The global warming, ocean acidification and hypoxia caused by the large amount of carbon dioxide released by the super volcanic eruption have always been considered to cause the cause of marine organisms, but the global warming seems to be unable to explain the response of land organisms. After the global warming, four -foot animal and plants should be migrated to high latitudes, but in fact, four -foot animal in high latitudes, especially the basic lizards, not only survived in the extinction, but also migrated to the incident after the incident to the incident Low latitudes areas, and large first dragon types in tropical areas, including dragon and predators, are almost all extinct.

Therefore, the research team infer that the "cold" of "volcanic winter" has caused great extinction of land biology, rather than the "hot" considered by traditional views, that is, the "volcanic winter" that super volcanic eruption is first caused factor. "Volcano Winter" refers to the long -term transportation of eruption materials after large -scale volcanic eruption, which strongly blocks the sunlight that should have radiated to the surface of the earth, which will cause abnormal atmospheric temperature to decrease.

"Based on the long -term research of the ice raft deposits of the Junggar Basin and the pornographic fossils of dinosaurs, we directly proved that the dinosaurs with feathers insulated have adapted to the seasonal cold climate since the first time in the evening, which helped them hide After the "volcanic winter 'at the end of the triple stack. Since the end of the three -stacking biological extinction, the total number of dinosaurs has doubled, and the era of earth -land hegemony for 130 million years has been opened." Fang Yaman said.

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