Figure 9. Origin of modern diatom flora, from stratigraphic ranges in the BDC.
red - tropical; light blue - Southern Ocean; purple - North Pacific. Age scale: [42].
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.