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Figure F1 (continued). E. Core with cavity and some branching corals (Hole M0018A, 4.61 mbsf). F. Surface of microbialite structures with dark brown manganese crust (Hole M0015A, 29.17 mbsf). G. Surface of microbialite structures with a brown iron/​manganese crust (Hole M0016A, 7.74 mbsf). H. Cavity with brown iron/​manganese crust (Hole M0016B, 23.68 mbsf). I. Blue/​purple-colored biofilm with high microbial activity and high abundance of cells (Hole M0015B, 0.47 mbsf).

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