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Tomiya Formation Otuka, 1949
- Type locality: Tomiya - Takeoka, Futtsu city, Chiba prefecture
- Coherent formation
- Fore-arc basin sediments (Kazusa trough)
- Pliocene
- Contemporaneous heterotopic facies: Kurotaki Formation
- Correlation (Upper): Ofuna Formation
- Correlation: Nojima Formation
- Sedimentary facies: Marine
- Sedimentary facies: Continental shelf, Continental slope
- Water temperature: Warm ocean current
- Depth of water: around wave base, Bathyal
- Lithofacies (Upper): Sandy mudstone, Muddy sandstone
- Lithofacies (Lower): Tuffaceous muddy sandstone
- Sedimentary structures (Lower, Minor): Trough cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tomiya - Takeoka, Futtsu city, Chiba pref.
- Fossils: Shellfishes, Trace fossils
- Tephra: To1, To3, To12
- Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
- Mitsunashi and Kikuchi (1982) Geology of the Yokohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 105p. (in Japanese with English abstract 4p.)