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Namigata Formation
It had been included in First Setouchi Supergroup but was excluded.
- Type locality: Namigata, Ibara city, Okayama prefecture
- Coherent formation
- late Eocene - early Oligocene
- Correlation: Kibi Group
- Sedimentary facies: Marine
- Lithofacies (Main): Sandstone
- Lithofacies (Basal): Conglomerate
- Thickness (Main): 100 m or thinner
- Thickness (Basal): 10 m or thicker
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ibara city - Yagake city, Okayama pref.
- Fossils: Coptothyris sp., Terebratalia sp., Dentaliidae, gen. et sp. indet
- Fossils (Bivalves): Acila (Truncacila) nagaoi, Saccella sp., Glycymeris? sp., Isognomon (Hippochaeta) hataii, Acesta (Plicacesta) takeyamai, Modiolus sp., Septifer sp., Chlamys (Nomurachlamys?) namigataensis, Crassostrea sp., Cyclocardia sp., Felaniella (Felaniella) namigataensis, Cultellus sp., Glauconome sp., iocyma sp., Mactromeris sp.
- Fossils (Gastropods): Cellana? sp., Lottia? sp., Margarites? sp., Sinum sp. aff. S. zonale, Turritella (Kotakaella) sp. aff. T. (K.) infralirata, Hipponix? sp., Epitoniidae, gen. et sp. indet, Molopophorus watanabei, Mohnia? sp., Exilia sp., Ficus sp., Turbonilla? sp.
- Matsubara (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.249-266 DOI
- Suzuki et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.139-151 DOI