Zhangye Danxia Landform is colorful rock formations Geological Park in Gansu province, China. These rock formations is a unique type of petrographic geomorphology, which can be found only in China. Colored rocks consist of red sand stones and conglomerates of mostly Cretaceous period. Research shows that about 100 million years ago there was a huge indoor swimming pool. Water carried here from the surrounding mud. As a result, global high temperatures, the pool is dry and arid conditions of the oxidized pellet and took rust color. About 70 million years ago, the red layer of 3,700 m thickness was formed in the basin, known as the chalk bed. At the top was a solid layer 1,300 meters thick, the Cretaceous period, the system layer, from which the mountain peaks Danks gradually formed.