Introduction to "Paleoinvertebrates": The exhibition hall shows the prosperity of the earth more than 100 million years ago, and details the development history of the rise and fall of ancient invertebrates, including protozoa, sponges, coelenterates Animals, brachiopods, molluscs, arthropods, echinoderms and other categories, as well as a large number of paleontological fossils of the Jehol Biota, especially the hairy dinosaur fossils in western Liaoning, are worth seeing.