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Tokaishoku vitreous volcanic ash zone Niigata Volcanic Ash Group, 1983
Synonyms: Pink zone
- Type locality: Tagawa river, Tokamachi city, Niigata prefecture
- Tephra
- Pleistocene
- Lithofacies: Volcanic ash
- Tokaishoku vitreous volcanic ash zone
- [ Upper ]
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- SK020
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tagawa river, Tokamachi city, Niigata pref.
- Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)