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Omiya Formation (Horiguchi, 1970) Nakazawa and Endo, 2002
- Type locality: Boring GS-KB-1, Uchimaki, Kasukabe city, Saitama prefecture
- Coherent formation
- Pleistocene
- Paleo-Tokyo bay fill deposit
- Correlation: Anesaki Formation
- Sedimentary facies: Fluvial
- Sedimentary facies: Fluvial channel, Flood plain, Marsh
- Lithofacies: Sands, Gravels
- Lithofacies (Minor): Mud
- Sedimentary structures: Cross stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Uchimaki, Kasukabe city, Saitama pref.
- Fossils: Plant roots, Plant fragments
- Fossils (Diatoms): Achnanthidium spp., Diploneis ovalis, Diploneis subovalis, Gomphonema spp., Hantzschia ampnioxy, Luticola mutica, Pinnularia borealis
- Fossils (Pollen): Alnus sp., Cryptomeria sp., Cupressaceae, Juglans sp., Picea sp., Pinus sp., Pterocarya sp.
- Tephra: On-Pm1, K-Tz
- Naya and Yasuhara (2014) Geology of the Konosu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 3p.)
- Nakazawa and Tanabe (2011) Geology of the Noda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
- Nakazawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.49-63 DOI
- Nakazawa and Endo (2002) Geology of the Omiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 41p. (in Japanese with English abstract 3p.)