![]() The question of how reefs develop into these shapes over evolutionary time produced an enduring conflict between two hypotheses, one from English naturalist Charles Darwin and the other from geologist Reginald Daly. Finally, an “atoll,” such as Manuae, appears as a ring of coral enclosing a lagoon with no island at its center. The “barrier” reefs of Bora Bora are separated from the main island by a calm lagoon. Tahiti’s coral forms a “fringing” reef, a shelf growing close to the island’s shore. The three different formations of South Pacific coral-reef islands have long fascinated geologists.
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