In the early 1970s, Huang Jianguo and others, scientific and technical personnel of the Second Geological Brigade of the Ministry of Geology, accidentally discovered a biological fossil in the exposed rock beside Dashanpu Highway in Zigong, Sichuan. Later, after textual research, it was confirmed that it was a dinosaur fossil. Since then, archaeologists from China have gathered in this quiet hilly area and found a large number of continuous fossil veins. Therefore, this must be a treasure house of fossils.
1977 10, a complete dinosaur fossil weighing 40 tons was displayed in front of stunned people. Two years later, when an oil operation team blasted rocks on a nearby hillside to build a parking lot, it "exploded" a thrilling scene: dinosaur fossils piled up one after another. When the wonders of the world appeared, a huge group of dinosaurs was rediscovered.
After preliminary excavation, more than 300 boxes of dinosaur fossils were unearthed in Dashanpu, including more than 200 dinosaurs, relatively complete bones 18 and extremely rare skulls. These treasures have aroused great interest of scientists at home and abroad, who have come to conduct field research in order to solve the eternal mystery of dinosaur life and death. Judging from the dinosaur fossils in Dashanpu, not all dinosaurs were giants. At that time, there were 20-meter-long and 40-ton "Shu Long" and 1.4-meter-long and 0.7-meter-high "Bird Foot Dragon". No matter how big or small, they don't look heavy, and they are energetic and quick.
The intelligence of dinosaurs is also relatively developed: the average brain IQ of stegosaurus is 0.56; Ceratosaurus is about 0.8; The carnivorous Tyrannosaurus Rex and Deinonychus are both above 5, probably trying to prey on vegetarian dinosaurs, and it is impossible without higher intelligence. Although dinosaurs' body temperature was lower than that of modern mammals and their thermoregulation system was worse, they didn't hibernate, had no feathers and moved at a speed of more than 4.8 kilometers per hour, so scientists thought they were warm-blooded animals, not cold-blooded animals like snakes and lizards.
It is estimated that these dinosaurs were buried in the stratum 65.438+0.6 billion years ago. Under anoxic conditions, they were consolidated, filled and replaced by sediments and rocks and became fossils, forming the fossils we see now. So, what caused the collective death of dinosaurs here?
One view is that at the end of Cretaceous about 70 million years ago, there was another strong crustal activity on the earth. Sichuan basin continued to uplift, shallow hills began to appear, and water was exhausted. The Sichuan Basin, which rose from the sea, formed a unique natural environment, and Zigong was a large catchment area at that time, so dinosaurs drifted here until they died.
Another view is that at the end of Cretaceous, the whole earth was cold in a large area, the temperature difference between day and night increased, and the four seasons appeared alternately. Dinosaurs accustomed to the tropical environment could not hibernate like snakes and lizards, nor could they hide in caves to avoid the cold like fur animals, so these local tyrants were "punished" by the cold of nature.
The above arguments and lawsuits cast a mysterious veil over the mystery of dinosaur death.