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Tokachi Group
Synonym: Ikeda Group (Takashimizu and Oka, 2007)
Matsui and Matsuzawa, 1985 defined Tokachi Group from Nukanai Formation to Nakazato Formation, whereas Takashimizu and Oka, 2007 defined Ikeda Group from Ikeda Formation to Nakazato Formation.
- Type locality: Tokachi plain, Hokkaido
- Coherent formation
- Pliocene - Pleistocene
- Sedimentary facies: Marine, Fluvial
- Tokachi Group
- [ Upper ]
- ~~~~~~~~~~~~~~
- Nakazato Formation
- '''''''/,,,,,,
- Shibusan Formation
- -------~~~~~~~
- Oribeyama Formation
- '''''''/,,,,,,
- Osarushinai Formation
- -------~~~~~~~
- Ikeda Formation
- ~~~~~~~~~~~~~~
- Nukanai Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ 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