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Takigawa Formation (Naruse et al., 1951) Kawakami and Shishikura, 2006

Invalid synonym: Takigawa Conglomerate Member, Okinoshima Sandy Siltstone Member

• Type locality: Takigawa, Tateyama city, Chiba prefecture
• Coherent formation
• Landward slope basin of trench
• middle Pleistocene
• Correlation: Ichijiku Formation, Chonan Formation, Kasamori Formation

• Sedimentary facies: Marine
• Lithofacies: Conglomerate, Sandstone, Sandy siltstone, Scoriaceous sandstone

• Thickness: 150 - 300 m or thicker
• Lower limit: Interfingered (Higashinagata Formation), Unconformity (Nishizaki Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Takigawa - Okinoshima island, Tateyama city, Chiba pref.
• Fossils: Shellfishes, Radiolarians, Diatoms, Calcareous nannofossils (Pseudoemiliania lacunosa)
• Fossils (Foraminifera): Gephyrocapsa caribbeanica, Gephyrocapsa oceanica, Gephyrocapsa parallela, Groborotalia truncatulinoides, Pulleniatina obliquiloqulata
• Tephra: BZ

• Utagawa et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.969-976 DOI
• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)
• Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)