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Figure F13. Photomicrographs of sand-sized lithic grains from upper nannofossil Zone NP23 (Oligocene; Sample 342-U1408A-4H-2, 100–101 cm). A. Overview of lithic grain types on a picking tray, showing abundant (angular) quartz grains and other mineral phases. B. Pinkish quartz grain. C. Two yellow quartz grains. D. Rock fragment and several quartz grains. E. Orange-brown rock fragment.

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