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Iriyamagawa Tuff Takano, 1990

• Tephra
• Pliocene

• Lithofacies: Pumice tuff

• Host: Tamugigawa Formation
• Thickness: 11 m or thicker

• Distribution: Mount Nabetachi, 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.)