Type
Subzone
Age range
9.3–8.7 Ma

International Timescale

Miocene
Tortonian

Neogene North Pacific Diatom Biochronology Subzones

Thalassionema schraderi
Denticulopsis katayamae
Denticulopsis dimorpha
9.309.259.209.159.109.059.008.958.908.858.808.758.70

Macrostrat

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