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NA75 Tephra
Abbr.: NA75
- Type locality: Niigata prefecture
- Tephra
- Pliocene (5.6 Ma, FT)
- Lithofacies: Rhyolite tuff
- Distribution: Asahi river, Ojiya city, Niigata pref.
- Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)
- 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.)