petrified ammonoid. an ancient fossil.

petrified ammonoid an ancient fossil pole lanterns ammonite ammonites ammonoidea animals archeology brown cephalopod closeup coil cretaceous evolution excavation extinct fossilization fossilized fossils fractal fragment geological era geology marine mineral natural nautilus object old paleontology period petrification prehistoric scientific stone snail shell nature animal spiral snails mollusk helix mollusc escargot ammoniten