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NA6 Tephra
Abbr.: NA6
- Type locality: Niigata prefecture
- Tephra
- Pliocene
- Lithofacies: Rhyolite volcanic ash
- Distribution: Nobe river, Ojiya city, 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.)