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NA13 Tephra Tokuhashi, 1985
Abbr.: NA13
- Type locality: Nobe river - Asahi river, Ojiya city, Niigata prefecture
- Tephra
- Pliocene (4.07, 3.9 Ma, FT)
- Lithofacies: Rhyolite -dacite vitreous tuff
- NA13
- [ Upper ]
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- NA13A
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- NA13B
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- NA13C
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- NA13D
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nobe river - Asahi river, Ojiya city, Niigata pref.; Hoshigatoge pass - Jodo river - Mount Kanakura, Nagaoka city, Niigata pref.; Imogawa river, Uonuma 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.)