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Mengxi Bitan Chapter 21 Yishi 18

During Zhiping period of the reign of Emperor Yingzong, a family in Zezhou found an object in the earth when digging a well. It was winding like a snake or a dragon. At first they did not dare to touch it. Seeing that it remained motionless for a long while, they began to lay their hands on it and found that it was a stone-like object. As the villagers were ignorant, they broke it into pieces. At that time Cheng Bochun was the county magistrate of Jincheng, he got a small piece and found that its scales looked like those of a living creature. Most probably it was transformed from a snake-like animal in the same way as the fossil of the crab was.