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Thalassiosira praefraga
1671
Type
Zone
Age range
24–20.3
Ma
International Timescale
Miocene
Burdigalian
Aquitanian
Oligocene
Chattian
Neogene North Pacific Diatom Biochronology
Crucidenticula sawamurae - Thalassiosira fraga
Thalassiosira praefraga
Neogene North Pacific Diatom Biochronology Subzones
Thalassiosira fraga
Thalassiosira praefraga
24.0
23.8
23.6
23.4
23.2
23.0
22.8
22.6
22.4
22.2
22.0
21.8
21.6
21.4
21.2
21.0
20.8
20.6
20.4
20.2
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