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Asojima I Tuff Muramatsu, 1988

• Tephra
• late Pliocene (2.91 Ma, FT)

• Lithofacies:

• Host: middle Asojima Formation

• Distribution: 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.)