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Nagaiwa Formation
- Type locality: Nagaiwa, Hikoroichi village, Ofunato city, Iwate prefecture
- Coherent formation
- late Carboniferous, early Bashkirian - early Muscovian, (Fusulinids)
- early Carboniferous, middle Serpukhovian - late Carboniferous, Muscovian, (Conodonts)
- Correlation: Tateishi Formation
- Sedimentary facies: Marine
- Lithofacies: Stratified limestone
- Lithofacies (Minor): Felsic tuff, Sandstone, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nagaiwa, Hikoroichi village, Ofunato city, Iwate pref.; Okuhinotsuchi, Sumita city, Kesen county, Iwate pref.
- Fossils: Corals, Fusulinids, Ostracods, Conodonts
- Fossils (Brachiopods): Spirifer sp., Productus sp., Spiriferina sp., Camarotoechia? sp., Echinaria minatoi, Cleiothyridina cf. glabristria, Punctospirifer? sp., Choristites mosquensis, Choristites jigulensis, Parachoristites sp.
- Tazawa and Kurita (2019) Jour. Geol. Soc. Japan, vol.125, no.3, pp.219-225 DOI
- Tazawa (2010) Jour. Geol. Soc. Japan, vol.116, no.4, pp.233-236 DOI