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Nishidohira Formation Watanabe, 1920
- Type locality: Nishidohira, Hitachi city, Ibaraki prefecture
- Continental shelf sediments near continental margins
- Deposition: Early Cretaceous
- Deposition (Invalid): This formation had been interpreted as late Cambrian (510 Ma, SHRIMP)
- Metamorphism: Early - Late Cretaceous (118.0 - 96.0, K-Ar)
- Metamorphic facies: Amphibolite
- Lithofacies: Mica schist, Mica gneiss, Amphibolite, Feldspathic schist
- Lithofacies (Protolith): Mudstone, Sandstone, Conglomerate, Rhyolitic tuff, Mafic volcaniclastic rocks
- Lithofacies (Protolith, Minor): Limestone
- Structure: Cross-stratification, Graded bedding, Load structure, Ripples
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nishidohira, Hitachi city, Ibaraki pref., Hase, Hitachiota city, Ibaraki pref.
- 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