Fossilized Ammonite

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Ammonites are the most widely known fossil. They usually posses a ribbed sprial-form shell. They lived in the seas and oceans between 240 to 65 million years ago. They became extin t along with the dinosaurs. Ammonites belong to the group cephalopods which were predators in the sea. Ammonites are excellent index fossils. Scientist link the rock layer in which a particular species or genus is found to a specific geologic time periods. Show more