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Asagai Formation (Nakamura, 1913) Tokunaga, 1927
- Type locality: Asagai, Jobanyumoto town, Iwaki city, Fukushima prefecture
- Coherent formation
- southern Yezo Forearc basin (Jobanoki basin)
- early Oligocene (Shellfishes, Foraminifera; 37.9, 37.8 Ma, Sr)
- Sedimentary facies: Shallow marine
- Sedimentary facies: Inner bay
- Sedimentary facies: Upper shoreface - Inner shelf
- Climate: Temperate - Cool temperate (Pollen)
- Lithofacies (Upper): Sandy siltstone
- Lithofacies (Lower): Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Asagai, Jobanyumoto town, Iwaki city, Fukushima pref.; Suetsugi, Hisanohama town, Iwaki city, Fukushima pref.; Akagi - Okidokawara - Hanyasawa, Tomioka city, Futaba county, Fukushima pref.
- Fossils: Foraminifera
- Fossils (Asagai fauna): Acila (Truncacila) oyamadensis, Clinocardium asagaiense, Cyclocardia laxata, Liocyma furtiva, Macoma sejugata, Mya (Arenomya) grewingki, Neverita sp., Turritella tokunagai, Yoldia laudabilis
- Fossils (Pollen): Alnus sp., Pinaceae, Taxodiaceae, Tsuga sp.
- Fossils (Foraminifera): Ammobaculles yumotoensis, Elphidium asagaiense, Elphidium yumotoense, Lenticulina fukushimaensis, Trochammina asagaiensis
- Fossils (Dinoflagellates): Hexagonifera? sp.. Trinovantedinium boreale
- 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.)