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Chw-1 Tephra
Abbr.: Chw-1
- Type locality: Chuei, Mishima, Nagaoka city, Niigata prefecture
- Tephra
- Pliocene - Pleistocene
- Lithofacies: Vitreous volcanic ash
- Sedimentary structures: Graded bedding
- Chw Tephra
- [ Upper ]
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- Chw-4
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- Chw-3
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- Chw-2
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- Chw-1
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Chuei, Mishima, Nagaoka city, Niigata pref.; Yoshikawa - Ogamaya - Jorakuji, Izumozaki city, Mito 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.)