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Jwg-4 Tephra
Abbr.: Jwg-4
- Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
- Tephra
- Pliocene - Pleistocene (3.10 Ma, FT)
- Lithofacies: Vitreous volcanic ash
- Lithofacies (Minor): Pumice
- Jwg Tephra
- [ Upper ]
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- Jwg-4
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- Jwg-3
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- Jwg-2
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- Jwg-1
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Jorakuji, Izumozaki city, Santo county, Niigata pref.
- Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)