Reasons for the large-scale preservation of Jiayin dinosaur national geological park in Heilongjiang Province

As early as 65438+ billion years ago, the vast platform in the east of Heilongjiang Province suffered from long-term erosion and folding, and began to produce faults, forming some fault basins and lakes. A large lake is formed near Jiayin, and various types of river facies, delta facies and lake facies are developed around it. This large inland freshwater lake has the characteristics of closed bay in its rock line development. At that time, the climate was humid, and many aquatic plants grew on the lake surface and bottom. There are also a large number of fish, snails, mussels, turtles and turtles. All kinds of creatures pursue growth and are full of vitality and happiness everywhere. Later, the vicissitudes of life changed dramatically, natural selection, survival of the fittest, from simple to complex, and the years changed. By the end of Cretaceous, with the crustal movement, the creatures around the Great Lakes were decreasing, and the amount of sediments in the lakes was also increasing. From large to small, the creatures in the lake are endless, then wither and die, and the natural environment has changed greatly. Perhaps it is the acceleration of continental separation and drift and the complexity of ocean circulation; Perhaps volcanic activity recedes the shallow sea; Maybe there are many mountains around the Pacific Ocean, which makes the climate of the earth cold. Perhaps it is the replacement of plants, and the delicious gymnosperms have been replaced by the unpalatable angiosperms. In the late Cretaceous period of more than 30 million years, the number of dinosaurs decreased continuously and finally all died out. The special geological environment in Jiayin provided favorable conditions for the formation and preservation of the stone during the extinction of dinosaurs.

The dinosaur fossils in Longgushan, Jiayin County have a large amount of burial, many groups, complete varieties, the most complete preservation, the richest information and wide distribution. The unearthed fossils of animals and plants rank first in the strata of the same period in China, which is rare in the world, filling the gap in the history of the development of animals and plants in the late Cretaceous in northern China. It is of inestimable value to study the paleogeography, paleotemperature, paleoclimate and paleoecological environment of China and Heilongjiang Province in the late Cretaceous. According to experts, their research value is higher than that of dinosaur fossils unearthed in Lufeng, Yunnan and Zigong, Sichuan. The former represents the rise of dinosaurs, while the latter represents the prosperity of dinosaurs. Only the dinosaur fossils unearthed in Jiayin represent the extinction period of dinosaurs. Therefore, this not only provides important clues and evidence for people to find out the reasons for the extinction of dinosaurs and other creatures on the earth about 65 million years ago, but also helps people to protect themselves, protect the environment and predict the future.

However, in the chaotic and ignorant years of old China, the dinosaur fossils exposed in Heilongjiang were stolen and dug by Russia several times, which cast an indelible shame on the "hometown of dinosaurs".

Longgu Mountain stands by the river. Due to the long-term erosion of the river, the natural vegetation has been seriously damaged. Disasters such as soil erosion, bank collapse, landslide and debris flow occur frequently, and various paleontological fossils are weathered into gravel and soil. Some are directly swept away by the river; Some were picked up by fishermen and tourists and scattered among the people. Especially in the flood season, the river water level is nearly 5 meters higher than that in normal years, and the intrusion on fossil resources is more serious. Other reasons for the destruction of fossil resources are: local fishermen cut down trees, built shacks, and stripped off deep rocks and soil layers before they saw dinosaur fossils. The dinosaur fossils were taken away, but the vegetation failed to recover. As for how many such fossils have disappeared, it is impossible to count. The resulting loss is immeasurable.