Figure F19. Photomicrographs of upper Oligocene/lower Miocene boundary interval nannofossils, Site U1405. Upper panel is age-diagnostic upper Oligocene (Sphenolithus ciperoensis) and Oligocene/Miocene boundary interval sphenoliths (Sphenolithus delphix and Sphenolithus capricornutus). Lower panel is a braarudosphaerid ooze sample predominantly showing abundant fragmented, trapezoidal, pentalith segments but also a complete Braarudosphaera specimen in the center.
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