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Kamasawagawa Andesite and Dacite Member Kobayashi et al., 1991
Invalid synonym: Kamasawa Formation
- Type locality: Kamazawa river, Kamazawa town, Nagaoka city, Niigata prefecture
- Volcanic rocks
- early - late Pliocene (2,74 Ma, FT)
- Sedimentary facies (Upper): Submarine pyroclastic flow deposit
- Lithofacies: Biotite hornblende dacite
- Lithofacies (Upper): Volcanic breccia, Tuff breccia
- Lithofacies (Upper, Minor): Lapilli tuff, Volcanic sandstone
- Lithofacies (Lower): Lava
- Thickness: 500 m or thicker
- Suyoshi Formation
- [ Upper ]
- --------------
- Kamasawagawa Andesite and Dacite Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kamazawa river, Kamazawa town, Nagaoka city, Niigata pref.; Kimenzawa river, Muramatsu, Nagaoka city, Niigata pref.; Ota river - Jodo river, Nagaoka 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.)