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Sbi Tephra

Abbr.: Sbi

• Type locality: Shionofuchi, Sanjo city, Niigata prefecture
• Tephra
• middle Miocene (13.8 Ma, FT)

• Host: Nanatani Formation

• Distribution: Shionofuchi, Sanjo 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.)