The Petrified Forest, consisting of domestic and international exhibition sections, is the largest collection and display of silicified woods in the world. As truly petrified wood, silicified wood is the remains of trees quickly buried underground hundreds of millions of years ago. The organic matter in woods has been replaced by silicon dioxide (SiO₂), but the structure and texture of wood remains the same. The domestic exhibition section is a collection of more than 400 woods mainly from Liaoning, Xinjiang, and Inner Mongolia. With the simulation of gobi desert and gobi oasis habitats, this section evokes a powerful feeling of a desert landscape with the petrified wood. These woods come from conifers from the Mesozoic era between 70 million and 150 million years ago. The international exhibition section is to the west of the domestic area and has more than 200 silicified woods mainly from Madagascar, Indonesia, the Americas, Mongolia, and Myanmar. The earliest of these woods are Taxodium-like and other conifers from the late Jurassic to early Cretaceous (about 135 million years ago), and the latest are Dipterocarpaceae from the Quaternary period (about 1 million years ago).