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Jonai Group Kanehara, 1948 ex Kanehara, 1950
- Type locality: Udazawa river, Muikamachi, Minamiuonuma city, Niigata prefecture
- Coherent formation
- Miocene
- Contemporaneous heterotopic facies: Awazawa Formation
- Correlation: Daijima Formation
- Lithofacies: Andesite, Basalt, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Udazawa river, Muikamachi, Minamiuonuma city, Niigata pref.; Sanashi river - Hane river - Hizuke river - Aburuma river - Matsukawa, Uonuma city, Niigata pref.; Summit of Mount Hakkaisan - summit of Mount Katsurayama - Mount Owariyama - Mount Kinjosan - Shiozawa, Minamiuonuma city, Niigata pref.
- Fossils (Daijima-type flora):
- Takahashi et al. (2004) Geology of the Suhara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 80p. (in Japanese with English abstract 4p.)
- Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
- Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)
- 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.)