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Hakkaisan Formation Yanagisawa et al., 1985
- Sedimentary facies: Terrestrial
- Lithofacies: Conglomerate, Sandstone, Shale, Volcanic conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Kinjosan - Mount Katsurayama - Mount Takakura - Mount Sarukura - Mount Kuwanoki - Mount Nekobu, Minamiuonuma city, Niigata pref.
- Fossils (Daijima-type flora): Liquidambar sp.
- 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.)