Figure F21. Photomicrographs of radiolarians preserved in chert within middle to lower Turonian sediment, Core 342-U1407B-24X. Left images taken under plane-polarized light and right images taken under cross-polarized light. A. Chert fragment showing circular outlines of radiolarians infilled with microcrystalline quartz and occurring in both darker and lighter laminae (Sample 342-U1407B-24X-1, 69–71 cm; 228.99 mbsf). B. Chert fragment showing numerous indistinct outlines of radiolarians, including a multirayed form (Sample 342-U1407B-24X-3, 22–24 cm; 231.74 mbsf). C. Chert fragment showing circular outlines of radiolarians in-filled with microcrystalline quartz and a prominent quartz vein (Sample 342-U1407B-24X-3, 55–57 cm; 231.86 mbsf).
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