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Io Tephra Chitani, 1926
Abbr.: Io
- Type locality: Iozumi, Kamiuchida, Kakegawa city, Shizuoka prefecture
- Tephra
- Pliocene - early Pleistocene (2.3 Ma, FT)
- Lithofacies: Volcanic ash
- Distribution: Iozumi, Kamiuchida, Kakegawa city, Shizuoka pref.
- Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)