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Figure F7. Scanning electron photomicrographs of terrigenous and diagenetic fractions in mound sediments. A. Silt-sized quartz grain (white arrow) (Sample 307-U1317A-12H-1, 135–140 cm). B. Layered clay grain (white arrow) (Sample 307-U1317A-5H-3, 85–90 cm). C. Euhedral calcite crystals (white arrow) (Sample 307-U1317A-8H-1, 135–140 cm). D. Pyrite in foraminifer chamber (white arrow) (Sample 307-U1317A-13H-3, 90–95 cm). E, F. Trioctahedral (euhedral) pyrite crystals (white arrow) (Sample 307-U1317A-14H-5, 145–150 cm).

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