Introduction to geological folds: The rock walls here are like thousand-layer cakes and are geological folds. The horizontal bedding of the rocks is clearly discernible. There are nine layers in total from top to bottom, with orderly ups and downs and twists and turns, like nine dragons crouching here. It is above a deep pool, so the pool is named Jiulongtan. This is a horizontal fold formed by the repeated action of longitudinal pressure and transverse tension during the Cenozoic orogeny. This fold belongs to the Warisian fold belt, which tells people what kind of geological changes Jinsi Gorge has experienced.