Figure 7. Stratigraphic trend observed in Hole 994C in the (1) diversity of upper-photic nannoflora expressed in Shannon-Wiener (S-W) Function (D_H), (2) relative abundance of F. profunda expressed as a ratio against the total upper-photic taxa, (3) percentage abundance of the very small placoliths, and (4) percentage abundance of the small placoliths. To make comparison easier, the F. profunda ratio is plotted in a reversed manner. The vertical bars at the right side of the figure indicate the time intervals when the site was mostly occupied by the gyre margin water or by the gyre water.