Type
Subzone
Age range
18.4–16.9 Ma

International Timescale

Miocene
Burdigalian

Neogene North Pacific Diatom Biochronology Subzones

Crucidenticula kanayae
Crucidenticula sawamurae
Thalassiosira fraga
18.418.318.218.118.017.917.817.717.617.517.417.317.217.117.016.9

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