The color of Red Stone Forest in Zhangjiajie changes with the weather.

Guzhang Red Stone Forest is the only red carbonate stone forest scenic spot formed in Cambrian in the world at present, and it was approved as a national geological park in 2005. The scenic area is covered with tall and strange rocks with different shapes and colors, which change with weather, time and season. Sunny red, rainy black, cloudy brown, morning and evening are different. According to the research of geological experts, the rock formation history of Hongshilin is about 450 million years. The Hongshilin area, like the Zuolongxi Gorge, belongs to the ancient sea of the Yangtze River in history. A large number of carbonate materials mixed with sediment have been deposited on the seabed, and this beautiful geological wonder has been formed through crustal movement, erosion and dissolution.