Type
Subzone
Age range
20.3–18.4 Ma

International Timescale

Miocene
Burdigalian

Neogene North Pacific Diatom Biochronology Subzones

Crucidenticula sawamurae
Thalassiosira fraga
Thalassiosira praefraga
20.320.220.120.019.919.819.719.619.519.419.319.219.119.018.918.818.718.618.518.4

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