Ammonite Large Fossil
Ammonite Large Fossil
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Ammonite Large Fossil

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Ammonites were shelled cephalopods that died out about 66 million years ago.

Before we understood what they were, one of the explanations for ammonites was that they were coiled-up snakes that had been turned to stone, earning them the nickname “snake stones”. But ammonites weren't reptiles: they were ocean-dwelling molluscs, specifically cephalopods.

Ammonites were born with tiny shells and, as they grew, they built new chambers onto it. They would move their entire body into a new chamber and seal off their old and now too-small living quarters with walls known as septa.