NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Asteroceras ammonite fossil. 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). It was found in Dorset, UK.
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