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Taiki Formation (Nemoto and Sasa, 1933) Onizuka, 1962
- Coherent formation
- late Miocene - early Pliocene (Diatoms)
- Lithofacies: Diatomaceous mudstone
- Lithofacies (Upper): Sandy mudstone, Tuffaceous mudstone
- Lithofacies (Minor): Sandstone
- Sedimentary structures: Sand dyke
- Distribution: Tokachi plain, Hokkaido
- Takashimizu and Oka (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.65-79 DOI