Figure F21. Photomicrographs showing details of the diagenesis of biogenic silica across the Subunit IIIA/IIIB boundary. A. Biosiliceous material (Section 346-U1425B-52H-1, 75 cm). B. Biosiliceous material disappears from dissolution and diagenetic transition to opal-CT (Section 346-U1425B-60H-4, 50 cm).
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