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Unformatted text preview: rugose and tabulate corals went extinct at the close of the Permian period. Figure 16 shows a coral collected in central Arizona. Near the end of the Devonian a mass extinction occurred. This one was more severe on marine creatures than on the newly established terrestrial forms. The corals were quite seriously decimated, and the return of extensive reef building did not occur until the Triassic with the evolution of a new group of reef-building corals, the scleractinians (shown in Figure 17). Corals were much restricted after the Devonian crisis and the large reefs of the Devonian were replaced with smaller reefs known as patch reefs. The role of corals in these new reefs was much reduced from what it had been in earlier times. Coral reefs, which had been decimated by the Carboniferous extinction returned to prominence with the evolution of new groups of reef-building animals and algae....
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- Fall '10
- Biology, Cnidaria, Extinction event, corals, jellyfishes