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Kunugidaira Formation (Eguchi and Shoji, 1953) Hanzawa, 1954
Invalid synonym: Taki Formation
- Type locality: Kunugidaira, Isohara, Kitaibaraki city, Ibaraki prefecture
- Coherent formation
- southern Yezo Forearc basin (Jobanoki basin)
- early Miocene (23.4, 20.8, 17.4 Ma, FT; 20.9 Ma, K-Ar)
- Correlation: Shiote Formation
- Sedimentary facies (Upper): Marine, Fluvial
- Sedimentary facies (Lower): Fluvial, Brackish
- Sedimentary facies (Upper): Flood plain, Tidal flat, Estuary
- Sedimentary facies (Lower): Braided river, Meandering river
- Climate: Subtropical
- Lithofacies (Upper): Sandstone, Mudstone)
- Lithofacies (Lower): Sandstone, Mudstone
- Lithofacies (Lower, Minor): Ryolitic tuff
- Lithofacies (Bottom): Conglomerate
- Sedimentary structures: Trough cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kunugidaira, Isohara, Kitaibaraki city, Ibaraki pref.; Akagi - Hanyasawa, Tomioka city, Futaba county, Fukushima pref.; Suemori, Namie town, Futaba county, Fukushima pref.; Suetsugi, Hisanohama town, Iwaki city, Fukushima pref.; Nagahata - Dokkameki - Aragami, Hirono city, Futaba county, Fukushima pref.; Yamadaoka - Osaka, Naraha city, Futaba county, Fukushima pref.
- Fossils (Upper, Akeyo-Kunugidaira fauna): Vicarya sp.
- Fossils (Lower): Daijima-type flora
- Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
- Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
- Kubo et al. (1994) Geology of the Namie and Iwaki-Tomioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 7p.)