Fossilised ammonites. Halved and polished section through fossilised ammonites. Ammonites are extinct cephalopod molluscs that lived in the oceans during the Jurassic and Cretaceous periods. They are distantly related to the modern day nautilus and lived in coastal waters and inland seas. Certain species of ammonite existed at specific times within the geological timescale. Their remains can be used for the accurate dating of marine rocks. Ammonites are therefore known as 'zone fossils.'.
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