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Hitachi Group (Suzuki, 1954) Ando et al., 2011
- Type locality: Hitachi city, Ibaraki prefecture
- Coherent formation
- southern Yezo Forearc basin (Jobanoki basin)
- late Miocene - late Pliocene
- Sedimentary facies: Marine
- Sedimentary facies: Submarine channel-fill deposit
- Lithofacies: Sandy mudstone, Mudstone
- Yotsukura, Fukushima pref.
- [ Upper ]
- ?--?--?--?--?-
- Yotsukura Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Hitachiota city, Ibaraki pref.
- [ Upper ]
- ?--?--?--?--?-
- Kume Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Hitachi city, Ibaraki pref.
- [ Upper ]
- ?--?--?--?--?-
- Sukegawa Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Onahama - Yotsukura, Iwaki city, Fukushima pref.; Hitachi city - Hitachiota city, Ibaraki pref.
- Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI