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Fukushima Formation Ueki and Sakai, 2007
- Type locality: Tamagawa river, Fukushima town, Akishima city, Tokyo
- Coherent formation
- early Pleistocene (ca. 1.77 - 1.6 Ma, Paleomagnetism)
- Correlation: Hirayama Formation
- Sedimentary facies: Marine
- Sedimentary facies: A cycle of regression - transgression sequence
- Lithofacies (Upper): Sands, Gravels
- Lithofacies (Middle): Sands
- Lithofacies (Lower): Gravels
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Fukushima town, Akishima city, Tokyo; Sakae town, Hino city, Tokyo
- Fossils: Mysticeti gen. et sp. indet.
- Tephra: Pink group tuff
- 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.)