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Crucidenticula sawamurae - Thalassiosira fraga
1670
Type
Zone
Age range
20.3–15.9
Ma
International Timescale
Miocene
Langhian
Burdigalian
Aquitanian
Neogene North Pacific Diatom Biochronology
Denticulopsis hyalina - Denticulopsis lauta
Crucidenticula sawamurae - Thalassiosira fraga
Thalassiosira praefraga
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
18.8
18.6
18.4
18.2
18.0
17.8
17.6
17.4
17.2
17.0
16.8
16.6
16.4
16.2
16.0
15.8
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