Figure F13. Photomicrographs of sand-sized lithic grains from Oligocene nannofossil Zones NP22–NP23. A. Overview of lithic grain types on a picking tray, showing abundant (angular) quartz grains and other mineral phases (Sample 342-U1406A-18H-CC). B, C. Sample 342-U1406A-21H-CC; (B) larger rock fragment; (C) yellow quartz grain. D–I. Sample 342-U1406A-18H-CC; (D) yellow quartz grain; (E) orange-brown and two transparent highly angular quartz grains with small rock fragment in the lower right corner; (F) pinkish brown quartz; (G) larger red mineral phase; (H) transparent highly angular quartz grains (top) and fish debris (bottom); (I) two transparent highly angular quartz grains.
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