Zhangye Danxia Landform, Gansu, China. The Danxia landform is a unique petrographic geomorphology, formed from red sandstone and conglomerates from the Cretaceous period. Around 80 million years ago, the formation of the landform started by way of sedimentation of the lakes and streams in the area. After another 15 million years, tectonic plate movements exposed faults. About 23 million years ago, the movement of the Himalayan range caused the land around Guandong to shift and break open, creating the Danxia landform. Photography by Melinda, Macau.