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NA21B Tephra

Abbr.: NA21B

• Type locality: Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Andesite lithic tuff

• Host: Kawaguchi Formation

• Distribution: Niigata pref.

• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)