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Io Tephra Chitani, 1926

Abbr.: Io

Invalid synonym: Iozumi Tuff

• Type locality: Iozumi, Kamiuchida, Kakegawa city, Shizuoka prefecture
• Tephra
• Pliocene - early Pleistocene (2.3 Ma, FT)

• Lithofacies: Hornblende dacite vitreous volcanic ash

• Host: Horinouchi Alternation
• Thickness: ca. 3 - 40 m

• 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.)
• Makiyama and Sakamoto (1957) Mitsuke & Kakezuka, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 7p.)