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Nukanai Formation (Nagao and Mitani, 1960) Yamaguchi et al., 1978

Invalid synonym: Noyaushi Formation

Matsui and Matsuzawa, 1985 defined as a member of Tokachi Group, whereas Takashimizu and Oka, 2007 defined as an independent formation.

• Coherent formation
• early Pliocene (Diatoms)

• Lithofacies: Interbedded sandstone and siltstone, Sandstone
• Lithofacies (Minor): Tuffaceous sandstone, Conglomerate, Sandstone

• Thickness: ca. 300 m
• Upper limit: Unconformity (Ikeda Formation or Ikeda Group)
• Lower limit: Unconformity (Taiki Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Tokachi plain, Hokkaido

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