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Onita Formation Iguchi, 1950
- Type locality: Onita pass, Nagabuchi, Ome city, Tokyo
- Coherent formation
- late Pliocene (2.58 - 1.95 Ma, Paleomagnetism)
- Correlation: Oyabe Formation, Otadai Formation
- Sedimentary facies: Fluvial
- Paleo-river system: Tamagawa river, Akikawa river
- Lithofacies: Gravels
- Lithofacies: Sands, Gravels
- Sedimentary structures: Channel structure, Imbricate structure
- Paleocurrent: to East
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Onita pass, Nagabuchi, Ome city, Tokyo; Mahikizawa pass - Tamagawa river, Komaki town, Ome city, Tokyo; Chigase town - Kabe town, Ome city, Tokyo; Hamuraohashi bridge, Hamura city, Tokyo; Shimokawara - Kitadenen - Minamidenen, Fussa city, Tokyo; Nishihonjuku, Hirai, Hinode city, Nishitama county, Tokyo; Ina, Akiruno city, Tokyo
- Fossils: Elephants (Stegodon aurorae)
- Fossils (Pollen): Metasequoia sp., Sequoia sp.
- Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)