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Updated: May 5, 2025
Zone of Nulliporae. Conglomerate. Depth of lagoons. Sediment. Reefs submerged wholly or in part. Breaches in the reef. Ledge-formed shores round certain lagoons. Conversion of lagoons into land. I will here give a sketch of the general form and structure of the many atolls and atoll-formed reefs which occur in the Pacific and Indian Oceans, comparing them with Keeling atoll.
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