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Figure F1. A. Dark-colored cavities in the reef framework, covered with microbial biofilms (Hole M0023B, 4.6 mbsf). B. Brown-colored cavity in the reef framework (Hole M0023B, 18.6 mbsf). C. Core originated from a reef cavity containing some coral branches overgrown by thrombolitic microbialites (Hole M0007C, 31.44 mbsf). D. Fossil coralline algal crust overgrown by microbial material (Hole M0007C, 9.75 mbsf). (Continued on next page.)

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