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Matsukawa Formation Chihara et al., 1981
- Type locality: Matsukawa river - Matsukawairi river, Yuzawa city, Minamiuonuma county, Niigata prefecture
- Volcanic rocks
- Miocene
- Intruded by: Quartz diorite, Quartz porphyry dike, Rhyolite dike Basalt dike, Porphyrite dike
- Correlation: Daishojinokashira Basalt Formation
- Lithofacies (Upper): Interbedded basalt tuff and rhyolite tuff
- Lithofacies (Upper, Minor): Shale
- Lithofacies (Lower): Altered basalt lava
- Lithofacies (Lower, Minor): Shale
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Matsukawa river - Matsukawairi river - Tsuchitaru, Yuzawa city, Minamiuonuma county, Niigata pref.
- Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)