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Kuroiwa Tuff Muramatsu, 1988

• Tephra
• Miocene (12.7 Ma, FT)

• Lithofacies:

• Host: Ogaya Formation

• Distribution: Niigata pref.

• Takeuchi et al. (1996) Geology of the Kakizaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 5p.)
• 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.)