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Unformatted text preview: fossils. The first of these occurrences was the goniatites, a group that ranged from the Devonian to the Permian. The ceratites are a Triassic group, while the last group, the ammonites ranged from the Triassic to the Cretaceous . Ammonoids finally went extinct in the great end-of-the-Cretaceous extinction. Nautiloids are represented today by the Nautilus . Differences between the groups are shown in Figure 12. The cephalopods recovered from the extinction of the goniatites at the close of the Paleozoic era and developed a remarkably similar group, the ceratites. These coiled, chambered animals, such as the one shown in Figure 12, had slightly more complex sutures than did the goniatites. However, the Ceratites also went extinct during the middle Mesozoic era....
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