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Dtbt Hiranaka et al., 2009

Abbr.: Dtbt

• Type locality: Deto, Nanatani, Kamo city, Niigata prefecture
• Tephra
• late Miocene (9.9 Ma, Diatoms)

Correlation: Otbt, Isbt, Wrp (Nakayama Formation), Tn38 (Tanokura Formation)

• Host: Minamiimogawa Formation

• Distribution: Deto, Nanatani, Kamo city, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)
• Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI