ocr: Section of Island with Fringing-Reefs Not to scale) A' AC B B' C A A D TA B A Level of Sea AA. Outer edges of the tringing-reet, at the level of the sea. 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 island. CC. Lagoon-channel. N.E B. - In this and the following woodcut, the subsidence of the land could be represented only by an apparent rise in the level of the sea. DARWIN: VOYAGE OF THE BEAGLE
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