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Tomita Formation (Arai, 1960) Makimoto and Takeuchi, 1992 (Photo)
- Type locality: right bank of Akahira river, Tomita, Chichibu city, Saitama prefecture
- Coherent formation
- Half graben-fill deposit
- middle Miocene
- Correlation: Kozono Formation, Obata Formation
- Sedimentary facies: Shallow marine
- Depth of water: Upper sublittoral (Foraminifera)
- Lithofacies: Siltstone
- Lithofacies (Minor): Sandstone, Conglomerate, Rhyolitic tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Akahira river, Tomita, Chichibu city, Saitama pref.; Shiraku, Arakawa, Chichibu city, Saitama pref.; Maehara, Minano city, Chichibu county, Saitama pref.; Komori river, Otomo, Ogano city, Chichibu county, Saitama pref.
- Fossils: Paleoparadoxia tabatai, Sea turtles (Kurobechelys tricarinata), Sharks (Teeth), Shellfishes (Turritella sp.), Foraminifera, Calcareous nannofossils
- Matsui et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.261-266, DOI
- Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
- Takahashi and Yanagisawa (2004) Jour. Geol. Soc. Japan, vol.122, no.12, pp.625-635.
- Makimoto and Takeuchi (1992) Geology of the Yorii District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)