Petrified wood is the wood of a tree, petrified vegetation. In the process of petrification - mineralization, over several hundred million years, all the organic matter of wood was replaced by minerals. At the same time, the structure of the tree is often well preserved - annual rings and bark are clearly visible. Although petrified wood is a stone, it retains its original wood appearance. The remains of a petrified tree are a trace of the past of our nature.