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

• Type locality: Hosogoe - Itayama, Oshima ward, Joetsu city, Niigata prefecture
• Tephra
• Miocene - Pliocene (4.4 Ma, FT)

• Lithofacies: Pumiceous tuff
• Lithofacies (Minor): Mudstone
• Sedimentary structures: Parallel stratification

• Host: Tamugigawa Formation
• Thickness: 7 m

• Distribution: Hosogoe - Itayama - Kamioka - Ashitani?, Oshima ward, Joetsu 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.)