Why did the dinosaurs avoid the extinction of the three stacks?Latest research: because of feathers!

About 20156.4 billion years ago today

History of geological history

One of the "Five Biological Cluster Extinction"

As a result, a large number of land and marine life extinction

But dinosaurs avoided this disaster

And after the end of the three -stacking creature extinction incident

Quickly occupy the main position of ecology

Domineering Jurassic and Baiji World

Caused the end of the three stacks of land creatures

What is the reason for extinction?

Why can dinosaurs survive

And develop rapidly after 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 stratum conducted a 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 terrestrial creatures at the end of the triple stack. The last biological extinction and occupying the main digit of the Jurassic ecology: It has feathers with insulation function and has already adapted to polar 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 was found in the mudstone of the Junggar Basin to the early Jurassic Lake, and the ice raft was found. This shows that even in the greenhouse and earth 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.

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.

The scientific community has always been considered

The eruption of the central Atlantic Super Fire Chengyan Province

It is the main reason for the trilateral endogenous extinction

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 life extinction, but the global warming seems to be unable to explain the extinction of land organisms.

In fact, after the "global warming", many dinosaurs in high latitudes survived. Instead, large -scale first dragons (including dragons and predators) in low latitudes of tropical regions were almost all extinct.

Therefore, the research team infer that the "cold" of "volcanic winter" has caused great extinction of land biology, not the "hot" that is considered by traditional views -that is: the "volcanic winter" that the super volcano eruption is first caused, which causes land organisms. The primary factor of extinction.

"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.

Fang Yaman said: "Based on the long -term research of the ice raft sedimentation of the Junggar Basin and the dinosaurs' footprint fossils, we directly proved that the dinosaurs with feathers insulated. The cold climate, this helped them escape 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 hegemon of 130 million years has been opened. "

Source: Guangming Daily

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