SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY. SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY.
Complex suture lines dividing the shell of an ammonite Tragophylloceras ibex, into chambers. Ammonites are a group of fossil molluscs belonging to the class Cephalopoda, which became extinct during the Cretaceous period. This specimen is from the Lower Lias.
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