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

• Type locality: Nabiro, Tokamachi city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Tuff

• Host: Tamugigawa Formation
• Thickness: 2 - 6 m or thicker

• Distribution: Nabiro, Tokamachi 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.)