Araucaria mirabilis is an extinct species of coniferous tree from Patagonia, Argentina. It belongs to the section Bunya (the only living species of which is Araucaria bidwillii from Australia) of the genus Araucaria. A. mirabilis are known from large amounts of very well preserved silicified wood and cones from the Cerro Cuadrado Petrified Forest, including tree trunks that reached 100 m (330 ft) in height in life. The site was buried by a volcanic eruption during the Middle Jurassic, approximately 160 million years ago.