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Ongata Formation Ueki and Sakai, 2007
- Type locality: Kawamachi town, Hachioji city, Tokyo
- Coherent formation
- end of early Pleistocene
- Sedimentary facies: Fluvial
- Sedimentary facies: Tributaries
- Lithofacies: Breccia, Silt
- Lithofacies (Minor): Sands, Pumiceous tephra
- Sedimentary structures: Channel structure
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kawamachi town - Ongata hills - Motohachioji hills - Funada hills, Hachioji city, Tokyo
- Fossils: Juglans megacinerea, Metasequoia cf. glyptostroboides
- Tephra: Ongata Tephra
- Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
- 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.)