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Daioin Formation Kuroda, 1959
- Type locality: Daioin, Hitachi city, Ibaraki prefecture
- Deposition: early Carboniferous (Corals)
- Metamorphism: Early Cretaceous - Late Cretaceous (118.0 - 96.0, K-Ar)
- Contemporaneous heterotopic facies?: Omika Formation
- Lithofacies: Crystalline limestone, Phyllite, Greenschist, Siliceous schist
- Lithofacies (Minor): Chloritoid schist
- Lithofacies (Protolith): Limestone
- Lithofacies (Protolith, Minor): Interbedded sandstone and mudstone, , Felsic tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Daioin, Hitachi city, Ibaraki pref.; Fudo fall, Ogitsu, Hitachi city, Ibaraki pref.; Shinkaede bridge, Miyata village, Hitachi city, Ibaraki pref.; Fudo fall, Miyata river, Hitachi city, Ibaraki pref.
- Fossils: Corals, Crinoids
- Tagiri et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.231-247, DOI
- Tagiri et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.1-20 DOI