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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 dike

• Thickness: ca. 900 m
• Upper limit: Unconformity (Nukanai Formation)

• Distribution: Tokachi plain, Hokkaido

• Takashimizu and Oka (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.65-79 DOI