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Kogawa Formation Yoshida and Katada, 1964
- Type locality: Iwate prefecture
- Volcanic rocks
- early Carboniferous, Visean (Corals, Fusulinids)
- Intruded by: Goyosan Granodiorite
- Lithofacies: Lava, Tuff, Tuff breccia, Slate
- Lithofacies (Minor): Sandstone, Limestone, Conglomerate, Chert
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kogawa - Sotoyama, Kamaishi city, Iwate pref.
- Fossils: Fusulinids (Pseudofusulina sp.)
- Fossils (Corals): Hexaphyllia sp., Siphonodendron pseudomartini
- Yoshida and Katada (1984) Geology of the Miyako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 44p. (in Japanese with English abstract 6p.)
- Yoshida and Katada (1964) Otsuchi and Karodake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 30p. (in Japanese with English abstract 6p.)
- Yoshida (1961) Kamaishi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 5p.)