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 0 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 ... A world miracle appeared and a huge dinosaur group "burial place" was rediscovered. After preliminary excavation, more than 300 boxes of dinosaur fossils, more than 200 dinosaur individuals, 18 relatively complete bones and an extremely rare skull were unearthed in Dashanpu. These treasures aroused great interest of scientists at home and abroad, who came to conduct field research 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 0-ton "Shu Long" and 1. The "bird-footed dragons" are meters long and 0.7 meters high. They are not heavy, energetic and agile. 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 because they have to prey on vegetarian dinosaurs, and they can't do 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 0.8 kilometers per hour, so scientists thought they were warm-blooded animals, not cold-blooded animals like snakes and lizards. According to estimates, these dinosaurs were buried in the stratum 654.38+0.6 billion years ago. Under anoxic conditions, they became fossils through the consolidation, filling and replacement of sediments and rocks, thus forming the fossils we see now.