KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Ammonite fossil. Fossilized shell of an unidentified ammonite. The fossil has been sectioned (cut in half) and polished. Ammonites are extinct cephalopods that lived between 380 and 65 million years ago. 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. This specimen was found on Madagascar.
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