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Tani Tuff Niigata University Reseach Group of Geology in Higashikubiki District, 1987

• Tephra
• Miocene

• Lithofacies: Acidic tuff

• Host: Sugawa Formation
• Thickness: 2.5 m

• Distribution: Koguro river, Shinanozaka, Yasuzuka ward, Joetsu city, Niigata pref.

• Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)