Rennell Island is a coral atoll in the South Solomon Sea whose entire coastline is formed by an uplifted reef complex. This complex consists of a succession of superimposed fore reefs and their associated reef flats, all of which have been completely dolomitized. During subsequent uplift, undolomitized fringing reef limestone was deposited upon the atoll reef complex, and lagoonal deposits accumulated in the enclosed central region. The atoll reef complex grew on a subsiding basement platform, the instability of which resulted in the drowning of successive stages of fore-reef development.

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