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NA27 Tephra
Abbr.: NA27
- Type locality: Niigata prefecture
- Tephra
- Pliocene
- Lithofacies: Andesite tuff (2 units)
- Lithofacies (NA27A): Andesite lithic tuff
- Lithofacies (NA27B): Andesite tuff
- NA27
- [ Upper ]
- --------------
- NA27B
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- NA27A
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- 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.)