In the 540 million years since the beginning of life, there have been only a few mass extinctions on our planet. Most people are familiar with the Cretaceous Tertiary extinction that occurred about 65 million years ago, which led to the extinction of 50% of dinosaurs and all animals and plants, and the Permian-Triassic period that wiped out 95 years ago 250 million years ago The percentage of all species extinct.
But now, scientists have reconsidered the impact of the “Carnival rainy season”, a major climate change event that occurred approximately 234 to 232 million years ago (late Triassic), leading to the age of dinosaurs, His interest re-examined the age of dinosaurs. The consequences of severe global environmental changes and widespread volcanic activity.
In the new research paper published in the online journal “Science Progress”
In their exploration of chaotic events, the latest analysis of paleontological data indicated that the “Carnian Basin Event” was a major-previously ignored period of mass extinction. It may be related to the disappearance of up to one-third of marine genera (invertebrates, vertebrates and protists) including many quadrupeds, and also related to many important modern animal and plant species such as conifers, insects, dinosaurs, crocodiles, etc. Related to explosive diversification. , Lizards, turtles and mammals.
The violent volcanic eruption in Wrangellia Province in western Canada was a weapon of smoking and the most likely cause of destruction and climate change. At that time, a large amount of hot volcanic basalt was poured out, forming most of the western coast of North America. .
Dr. Dal Corso said: “Volcanic eruptions reached their peak in Carnian.” “A few years ago, I was studying the geochemical characteristics of the eruptions and determined some huge effects on the global atmosphere. Volcanic eruptions are so large that they A lot of greenhouse gases are emitted, such as carbon dioxide, and the peak of global warming is increasing.”
These humid and warming periods, which lasted up to a million years, were accompanied by a sharp increase in global rainfall, as geologists Mike Simms and Alastair Ruffell discovered in the 1980s. This gradual climate change is reflected in the loss of major biodiversity on the ocean and land.
However, after the extinction event, various new groups flourished, resulting in a more modern ecosystem. These climate changes are conducive to the continuous growth of plant life, especially the expansion of coniferous forests.
Professor Benton explained: “The new flora may provide a slim pick for the remaining herbivorous reptiles.” “We now know that the dinosaurs originated about 20 million years before this event, but in the Carnian Pluvial Episode Before they came, they were still very rare and unimportant. After the wet weather, sudden drought conditions gave the dinosaurs a chance.”
These more hospitable conditions not only enabled the rise of dinosaurs, but also allowed modern flora and fauna to multiply, including some early turtles, crocodiles, lizards and the first mammals. The impact of “Carnian Pluvial Episode” on marine life must also be considered, because it marks the emergence of modern-style coral reefs and numerous planktons, which all indicate historical changes in ocean chemistry and carbonate cycles.
Dr. Dal Corso said: “So far, paleontologists have discovered 5 mass extinction species in the past 500 million years of life history.” “Each factor has a profound impact on the evolution of the earth and life. We. Another major extinction event has been identified, which apparently played an important role in helping to reset terrestrial and marine life, marking the origin of modern ecosystems.”