Layers of sedimentary rocks are a "thousands of books" that records the history of the earth, and fossils are "words" in the book. Fossils are the remains, relics and living remains of paleontology preserved in the stratum through the action of nature. Most of them are hard parts such as stems, leaves, shells and bones. They are filled and alternated by minerals, forming calcified, carbonized, silicified and mineralized remains, relics or imprints, only keeping their original shape, structure and even imprints. There are also a few intact relics that have not been changed, such as insects in tiger swatter. When we are teaching thousands of books that record the history of the earth, if there is a fossil, let the pupils see how good it is! But where can I find fossils in plain areas or cities? Don't worry, I'll tell you: look in the coal. We know that coal is formed by lush plants growing in a certain geological age, gradually accumulating into thick layers in a suitable geological environment, buried in the bottom of the water or sediments, and formed by natural coalification in a long geological age. In the process of coal formation, a dark gray rock with lower carbon content and harder than coal is associated with coal seam. We call it coal rock. There will be many kinds of plant fossils in the coal grindstone. You can often find fossils by cracking coal and grinding stones. .23 Looking for Fossils in Coal Gangue @ Summer $ The sedimentary rocks on the first floor of Yangzhou Normal School in Jiangsu Province are the "thousands of books" to record the history of the earth, and fossils are the words in the book. Fossils are paleontological remains, relics and their lives preserved in the stratum through natural action. ......