Introduction to the Yangtze Ancient Sea: According to the research of geological experts, the formation history of the Hongshilin rocks is about 450 million years. The Hongshilin area, like the Zuolongxi Canyon, belongs to the so-called Yangtze Ancient Sea in geological history. A large amount of carbonic acid mixed with mud and sand was deposited on the seabed. Salt material, through crustal movement, erosion and dissolution, formed this beautiful geological wonder.