The sand grain in Devonian stratum in the whispering wall of Zhangjiajie Wulingyuan and the ripple marks of the cliff paintings in Tiaoyutan are rare geological relics. They could not only be opened to the public, but also evidence for studying the ancient environment and the changes between the sea and the land. The coral fossils, found in Permian strata in Tianzi Mountain, look like markings on the back of a turtle, so it is called a “Tortoise figure stone”. Furthermore, They are good materials for carving various crafts.
Translated by Sophia