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Kamisekida Tuff Nakamura, 1999

• Type locality: Kamisekida, Itakura ward, Joetsu city, Niigata prefecture
• Tephra
• Pliocene (3.35 Ma)
• Correlation: Itayama Tuff

• Lithofacies:

• Host: top of Ichinose Formation
• Thickness: 10 - 15 m

• Distribution: Kamisekida, Itakura ward, Joetsu 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.)