Type
Subzone
Age range
8.7–7.67 Ma

International Timescale

Miocene
Tortonian

Neogene North Pacific Diatom Biochronology Subzones

Rouxia californica
Thalassionema schraderi
Denticulopsis katayamae
8.78.78.68.68.58.48.48.38.38.38.28.28.18.18.08.07.97.87.87.87.77.7

Macrostrat

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