NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Ammonite fossils. Section of rock containing Asteroceras (large shell) and Promicroceras (small shell) ammonites. Ammonites, now extinct, were marine invertebrate molluscs with a spiral shell. Most were less than 20 centimetres across. This specimen is from the Lower Lias strata (200 to 180 million years ago), located in Marston Magna, near Yeovil, Somerset, UK.
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