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SECTION OF CORAL-REEF. A'A', Outer edges of the barrier-reef at the level of the sea, with islets on it. B'B', The shores of the included island. CC, The lagoon-channel. A''A'', Outer edges of the reef, now converted into an atoll. C', The lagoon of the new atoll.
BB, The shores of the fringed island. A'A', Outer edges of the reef, after its upward growth during a period of subsidence, now converted into a barrier, with islets on it. B'B', The shores of the now encircled islands. CC, Lagoon-channel. No theory on the formation of coral-reefs can be considered satisfactory which does not include the three great classes.
AA Outer edge of the reef at the level of the sea. BB Shores of the island. A'A' Outer edge of the reef, after its upward growth during a period of subsidence. CC The lagoon-channel between the reef and the shores of the now encircled land. B'B' The shores of the encircled island.
B'B' The shores of the island, generally formed of low alluvial land and of coral detritus from the lagoon-channel. A"A" The outer edges of the reef now forming an atoll. C' The lagoon of the newly formed atoll. Let us in imagination place within one of the subsiding areas, an island surrounded by a "fringing-reef," that kind, which alone offers no difficulty in the explanation of its origin.
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