Figure 24. Biostratigraphic summary of shelf sites (Holes 1097A, 1100D, and 1103A), based on
shipboard observation, with seismic correlation. Light gray horizons show materials of very rare
diatom occurrence. Dark gray horizons show intervals barren of microfossils. Age assignment of
S3 at Hole 1097A is based on benthic foraminifers, diatoms, and radiolarian biostratigraphy. The
depths of seismic reflectors at Hole 1103A are refined with logging information.
To 178 Figure 25