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Atera Formation (Katada and Isomi, 1958) Yamada et al., 1971
- Type locality: Ateragawa river, Okuwa city, Kiso county, Nagano prefecture
- Volcanic rocks
- Caldera
- Late Cretaceous - Paleogene
- Correlation: Aoya Tuff
- Sedimentary facies: Lacustrine
- Lithofacies: Tuffaceous sandstone, Tuffaceous mudstone, Conglomerate, Tuff, Pumice tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ateragawa river, Okuwa city, Kiso county, Nagano pref.; Kashimo, Nakatsugawa city, Gifu pref.; Higashishirakawa city, Kamo county, Gifu pref.; Aoya, Asahi town, Takayama city, Gifu pref.; Wakatochidani valley - Ichiidani valley -Nigorikawadani valley - Akanda - Ogurogawa river, Osaka town, Gero city, Gifu pref.
- Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)
- Kawada et al. (1988) Geology of the Hagiwara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 10p.)
- Yamada et al. (1985) Geology of the Takayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)