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Takegahana Formation Yoneyama Research Group, 1967

Invalid synonym: Takeuchi et al. considered Sugawa Formation is included.

• Type locality: Manzo river, Takegahana, Kakizaki ward, Joetsu city, Niigata prefecture
• Coherent formation
• late Miocene - late Pliocene (Diatoms, FT)
• Contemporaneous heterotopic facies (Upper): Yoneyama Formation, Tamugigawa Formation
• Contemporaneous heterotopic facies (Lower): Hijirigahana Formation
• Correlation: Shiiya Formation, Nishiyama Formation, Suganuma Formation

• Sedimentary facies: Marine
• Lithofacies: Siltstone, Mudstone, Interbedded siltstone and sandstone
• Lithofacies (Minor): Pumice tuff, Sandy tuff

• Thickness: ca. 400 - 900 m or thicker
• Upper limit: Conformity (Tamugigawa Formation)
• Lower limit: Conformity (Hijirigahana Formation, Ogaya Formation)

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

• Distribution: Manzo river, Takegahana, Kakizaki ward, Joetsu city, Niigata pref.
• Fossils: Diatoms
• Fossils (Shellfishes): Acila divaricata, Grycymeris yessoensis, Patinopecten sp., Serripes cf. makiyamai, Yoldia thranciaeformis
• Fossils (Foraminifera): Buccella frigida, Buccella kuromatsunaiensis, Buliminella elegatissima, Elphidium advenum, Eptominella japonica, Martinottiella communis
• Fossils (Pollen): Actinoptychus ochotensis, Actinoptychus octonarius, Actinoptychus senarius, Asteromphalus, Aulacoseira spp., Azpeitia nodulifera, Cocconeis curviritunda, Cocconeis scutellum, Cocconeis vitrea, Coscinodiscus marginatus, Coscinodiscus perforatus, Coscinodiscus radiatus, Cyclotella striata, Delphineis surirella, Denticulopsis praedimorpha var. minor, Diploneis bombus, Diploneis smithii, Grammatophora spp., Hemidiscus cuneiformis, Hyalodiscus obsoletus, Melosira scopos, Neodenticula kamtschatica, Neodenticula koizumii, Nitzschia fossilis, Nitzschia reinholdii, Odontella aurita, Paralia sulcata, Proboscia alata, Pseudopyxilla americana, Rhizosolenia hebetata f. hiemalis, Rhizosolenia styliformis, Rouxia californica, Simonseniella barboi, Stellarima microtrias, Stephanodiscus sp., Stephanopyxis dimorpha, Thalassionema nitzschioides, Thalassiosira antiqua, Thalassiosira convexa var. aspinosa, Thalassiosira gravida f. fossilis, Thalassiosira oestrupii, Thalassiosira trifulta, Thalassiothrix longissima
• Tephra: Komeyama Tuff, Hijirigahana Tuff

• Takeuchi et al. (1996) Geology of the Kakizaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 5p.)