NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Fossilised Oxynoticeras oxynotum ammonite. The living tissues have been replaced by calcite (green) and pyrite (yellow). Ammonites, now extinct, were marine invertebrate molluscs with a spiral shell. This specimen is 16 centimetres across and dates from the Lower Jurassic (around 200 to 175 million years ago).
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