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Uwano Formation Chihara et al., 1981
- Type locality: Kiyotsu river, Kiyotsukyo hot spring - Koide, Nakasato, Tokamachi city, Niigata prefecture
- Coherent formation
- Miocene (10.1 Ma, K-Ar)
- Correlation: Akaya Formation
- Correlation (Upper): Teradomari Formation
- Correlation (Lower): Nanatani Formation
- Intruded by: Miyanoshita Quartz diorite porphyry, Kiyotsukyo Quartz diorite porphyry, Basalt
- Intruded by (Sills): Augite basalt, Hypersthene basalt, Hypersthene augite andesite, Augite andesite
- Lithofacies (Upper): Rhyolite pumice tuff
- Lithofacies (Upper, Minor): Tuffaceous siltstone, Shale, Sandstone, Sandy tuff
- Lithofacies (Lower): Shale
- Lithofacies (Lower, Minor): Sandstone, Sandy tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Miyanoshita - Nita river, Shiozawa, Minamiuonuma city, Niigata pref.; Kiyotsu river, Kiyotsukyo hot spring - Koide, Nakasato, Tokamachi city, Niigata pref.; Shibakura creek - Mount Mitako, Tokamachi city, Niigata pref.
- Fossils: Fish scales, Foraminifera
- Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)
- 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.)
- 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.)