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Ammonite fossils are often (but not always) a distinctive flattened spiral coil with visible ribs, although there are species with unusual coil shapes, partially coiled shells, and even uncoiled shells. Most Ammonites are quite small, perhaps 9 inches (23 centimeters) or less in diameter - there are however some larger types, for example Parapuzosia seppenradensis which is found in Cretaceous rocks from Germany is sometimes upto 6½ feet (2 meters) in diameter,
Ammonite fossils have been known since ancient times:
Ammonites were cephalopod molluscs that lived in the seas between 400 and 65 million years ago
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