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Itayama Tuff Niigata University Research Group of Geology in Higashikubiki District, 1987

Invalid synonym: Jaiwa Tuff

• Type locality: Itayama fudoson, Itayama, Oshima ward, Joetsu city, Niigata prefecture
• Tephra
• Miocene - Pliocene (4.5, 4.1 Ma, FT)
• Correlation: Kamisekida Tuff, Muroda Tuff

• Lithofacies: Pumiceous tuff
• Sedimentary structures: Parallel stratification, Slump structure, Sole mark

• Host: Tamugigawa Formation
• Thickness: ca. 4.5 - 5 m

• Distribution: Itayama - Ashitani?, Oshima ward, Joetsu city, Niigata pref.; Kurohime river, Isonobe, Takayanagi town, Kashiwazaki city, Niigata pref.; Jaiwa, Mount Kurohime, Takayanagi town, Kashiwazaki city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Takeuchi et al. (1996) Geology of the Kakizaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 5p.)
• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)