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Ammonite. Ammonite. Pattern of polished ammonite. Pattern of polished ammonite. Pattern of sectioned ammonite. Ammonite. Ammonite. Ammonite fossil in shale. Kimmeridge, Dorset Ammonite fossil in shale. 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 Sliced ammonite. Sliced ammonite. Bipedal dinosaur footprint. Late Triassic petrified wood and Chinle Formation (clay and sandstone). Petrified Forest National Park, USA