When Was the Formation of Colorful Hills and Ice Valleys?

The colorful hills and Binggou Danxia landform are mainly developed in the Mesozoic Cretaceous strata, which is the last period of the Mesozoic geological era, between the Jurassic and Paleogene periods, with a length of 80 million years. It is named after the fact that the strata of this era in western Europe are mainly sedimentary chalk. During the Cretaceous period, the climate was warm, with dinosaurs living on the land and marine reptiles, ammonites, and thick shell clams living in the ocean. New mammals and birds emerged, and the dinosaur species reached their peak. At this time, Tyrannosaurus rex emerged as the largest terrestrial carnivore to date.