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Izumi Formation Suzuki, 1951
- Type locality: Tadami river, Izumi, Aizubange city, Kawanuma county, Fukushima prefecture
- Coherent formation
- late Pliocene
- Sedimentary facies: Terrestrial
- Sedimentary facies: Fluvial
- Sedimentary facies (North): Braided river of alluvial fans
- Sedimentary facies (South): Bifurcated channel river
- Sedimentary facies: Sandy river channel deposit, Flood plain
- Lithofacies: Conglomerate, Sandstone, Siltstone
- Sedimentary structures: Trough cross-stratification, Graded bedding, Ripple lamination, Parallel stratification, Imbrication
- Paleocurrent: Southwest - West-southwest, Northwest, North, Southeast
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tadami river, Izumi, Aizubange city, Kawanuma county, Fukushima pref.; Hara river, Yamato town, Kitakata city, Fukushima pref.; Mount Hakase, Fukushima pref.; Sakasegawa, Aizumisato city, Onuma county, Fukushima pref.
- Fossils: Shellfishes (Freshwater), Plants
- Tephra: Akarutoge Pyroclastic Flow Deposit
- Tephra (Basal): Hotokezawa Pyroclastic Flow Deposit
- Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
- Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)
- Yamamoto and Yoshioka (1992) Geology of the Wakamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)