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Shimotarumoto Tuff Nakamura, 1999

• Type locality: Tarumoto, Myoko city, Niigata prefecture
• Tephra
• late Miocene - early Pliocene (4.3 Ma, K-Ar)

• Lithofacies: Felsic tuff (some dozen units)

• Host: upper Tomikura Formation

• Distribution: Tarumoto - Baba river, Myoko city, Niigata pref.

• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)