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Petrified wood. Petrified Forest National Park, USA Petrified wood. Petrified Forest National Park, USA Petrified wood. Petrified Forest National Park, USA Petrified wood. Petrified Forest National Park, USA Petrified wood. Petrified Forest National Park, USA Petrified wood. Petrified Forest National Park, USA Lichen on petrified wood. Petrified Forest National Park, USA Late Triassic petrified wood and Chinle Formation (clay and sandstone). Petrified Forest National Park, USA