Figure F3. Stratigraphic ranges of key species in the Thalassiosira trifulta group in the northwest Pacific Ocean. Dashed lines represent range extensions based on rare or sporadic occurrences (modified from Shiono and Koizumi, 2001). NPD = North Pacific diatom zone.

Figure F3. Stratigraphic ranges of key species in the Thalassiosira trifulta group in the northwest Pacific Ocean. Dashed lines represent range extensions based on rare or sporadic occurrences (modified from Shiono and Koizumi, 2001). NPD = North Pacific diatom zone.