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Fujikotogawa Formation Sumi et al,, 1962
- Type locality: Fujikoto river, Takaishizawa - Kanazawa, Fujisato city, Yamamoto county, Akita prefecture
- Coherent formation
- Miocene
- Correlation: Ittori Formation
- Sedimentary facies: Marine
- Sedimentary facies (Bottom): Shallow marine
- Water temperature (Bottom): Cold ocean current (Shellfishes)
- Lithofacies: Mudstone, Acidic pumice tuff
- Lithofacies (Bottom): Sandstone, Tuffaceous sandstone
- Lithofacies (Bottom, Minor): Pyroxene andesite lava, Tuff breccia
- Sedimentary structures: Cross stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Fujikoto river, Takaishizawa - Kanazawa, Fujisato city, Yamamoto county, Akita pref.; Yonaizawa, Kitaakita city, Akita pref.
- Fossils: Sponges (Makiyama chitanii), Brachiopods, Whales (Ribs), Sharks (Carcharodon megalodon, Teeth)
- Fossils (Shellfishes): Arca sp., Chlamys hataii, Chlamys kaneharai, Chlamys cf. swiftii, Cyclammina sp., Limatula sp., Lima yagenensis, Natic sp., Lucinoma acutilineatum, Macoma sp., Nuculana sp., Patinopecten sp., Petunculus sp., Turritella sp.
- Fossils (Foraminifera): Angulogerina kokozuraensis, Cassidulina japonica, Cassidulina yabei, Cibicides pseudoungerianus, Dentalina sp., Elphidiella sp., Elphidium subgranulosum, Globigerina bulloides, Globigerina cf. diplostoma, Guttulina sp., Pullanulina sp., Rotalia japonica, Sigmomorphina sp.
- Tephra: Upper Nanakura Tuff Member, Lower Nanakura Tuff Member
- Murakami et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.111-120 DOI
- Sumi and Moritani (1973) Geology of the Yonaizawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 46p. (in Japanese with English abstract 4p.)
- Hirayama and Sumi (1963) Takanosu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 7p.)
- Sumi et al. (1962) Dairakozan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 51p. (in Japanese with English abstract 7p.)