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Ochiai Formation Onuki, 1969
- Type locality: Tsuzuki - Ochiai - Kogaisawa, Sumita city, Kesen county, Iwate prefecture
- Coherent formation
- Permian
- Sedimentary facies: Marine
- Lithofacies: Mudstone
- Lithofacies (Minor): Sandstone, Usuginu Conglomerate, Limestone
- Thickness: 1,500 m or thicker
- South Kitakami Belt (northeast of Senmaya)
- [ Upper ]
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- Ochiai Formation
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tsuzuki - Ochiai - Kogaisawa, Sumita city, Kesen county, Iwate pref.; Mount Ogi - Tenjin pass - Mount Murone, Ichinoseki city, Iwate pref.
- Fossils: Brachiopods (Leptodus nobilis)
- Fossils (Fusulinids): Lepidolina sp., Monodiexodina matsubaishi, Verbeekina verbeeki
- Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)