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Nameirizawa Formation Okami et al., 1986
- Type locality: Nameiri creek, Nameiri - Ochiai, Ohasama town, Hanamaki city, Iwate prefecture
- Coherent formation
- Paleozoic volcanic island arc
- Silurian (430 Ma, U-Pb)
- Correlation: Yakushigawa Formation
- Sedimentary facies: Turbidite
- Lithofacies: Mudstone, Sandstone, Interbedded sandstone and mudstone, Felsic tuff
- Lithofacies (Minor): Orthoquartzite-bearing conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nameiri - Ochiai - Tenno - Oriai creek - Kasazume creek - Seirennotaki creek - Orikabe - Akasawa river, Ohasama town, Hanamaki city, Iwate pref.
- Fossils: Radiolarians, Trace fossils
- Fossils (Limestone gravels): Favositids
- Kawamura et al. (2013) Geology of the Hayachine San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Uchino et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.141-157 DOI