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NA40 Tephra

Abbr.: NA40

• Type locality: Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Tuff

• Host: Kawaguchi Formation
• Thickness: 5 - 8 cm

• 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.)