It turns out that when the branches of ancient trees that can secrete resin (gum) are broken, the gum flows out of the wound and emits fragrance, attracting insects with sensitive sense of smell. When insects come into contact with chewing gum, it will stick firmly. Gum is still flowing out, wrapping the insects tightly, and the insects are completely isolated from the outside world. Therefore, insects are completely isolated from the outside world. So insects are spared from the decomposition of bacteria and are well preserved. With the passage of time and the movement of the earth's crust, virgin forests were buried underground, trees turned into coal, and small lumps of gum became transparent fossils. Therefore, amber is actually a trace fossil formed by ancient plant secretions, while insects in amber are trace fossils with unchanged bodies. Also, have you heard the story of fish swimming up the mountain? Now, look at the ichthyosaurs that swam to the Himalayas! Ichthyosaurus is a successful branch of the ancient ocean and a powerful enemy of marine fish. 1964- 1968, scientists in China discovered many ichthyosaur fossils while visiting the Himalayas. This is the highest known vertebrate origin in the world. So how did it "swim" to the Himalayas? The stratigraphic age of ichthyosaur fossils is the Late Triassic, which is 265,438+1100 million years ago. At that time, the Himalayan region was a part of Wang Yang, connected with the Mediterranean Sea. Later, with the crustal movement, it rose to a flat land and a mountain, and the ichthyosaur originally buried at the bottom of the sea "swam" to the mountain with the crustal movement. Himalaya is a young mountain range, and it is still rising. From here, we not only found marine fossils, but also provided a basis for the study of biological purchase, and also provided valuable evidence for the study of paleogeography.
Natural ones are very expensive, but now many of them are artificial and not very valuable.