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Otsuka Formation (Suzuki, 1932) Ito, 1985
Invalid synonym: Mutsukura Formation
- Type locality: Otsuka, Sumida - Mutsukura, Nakatsu, Aikawa city, Aiko county, Kanagawa prefecture
- Coherent formation
- late Pliocene - early Pleistocene
- Sedimentary facies: Marine
- Lithofacies: Silt
- Lithofacies (Minor): Pumiceous tephra, Scoriaceous tephra
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Otsuka, Sumida - Mutsukura, Nakatsu, Aikawa city, Aiko county, Kanagawa pref.; Mochi, Tana, Chuo ward, Sagamihara city, Kanagawa
- Fossils: Marine mammals
- Fossils (Shellfishes, Deep sea): Acila insignis, Cadulus sp., Leda cf. ramsayi, Yoldia japonica
- Tephra: Tn-GP
- 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.)
- Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.7, pp.360-373 DOI
- Oka et al. (1979) Geology of the Fujisawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 5p.)