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Irajima Tuff Muramatsu, 1987

• Tephra
• Pleistocene (1.11 Ma, FT)

• Lithofacies: Vitreous tuff

• Host: Komanoma Formation

• Distribution: Irajima, Kashiwazaki city, Niigata pref.

• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)