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Otbt (Kurokawa and Omi, 2000)

Abbr.: Otbt

• Type locality: Otonashi river, Aga city, Higashikanbara county, Niigata prefecture
• Tephra
• late Miocene (ca. 9.9 Ma, Diatoms)

Correlation: Dtbt, Isbt

• Host: Nomura Formation

• Distribution: Otonashi river, Aga city, Higashikanbara county, Niigata pref.

• Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI