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Kotaki Formation (Ujihara, 1985) Nagamori et al., 2010
Invalid synonymj: Kotaki Complex, Kotaki Olistostrome
- Type locality: Kotaki, Itoigawa city, Niigata prefecture
- Volcanic rocks
- middle Permian (Radiolarians)
- Deposition (Limestone): early - middle Carboniferous (Fossils)
- Deposition (Chert): middle Permian (Radiolarians)
- Deposition (Siliceous shale): middle Permian (Radiolarians)
- Correlation: Shiroumadake Formation, Tsugaike Complex
- Sedimentary facies: Marine
- Lithofacies (Upper): Interbedded mudstone and siliceous tuff
- Lithofacies (Middle): Sandstone
- Lithofacies (MIddle, Minor): Limestone breccia, Mudstone
- Lithofacies (Lower): Interbedded mudstone and mafic tuff
- Lithofacies (Bottom): Basalt lava (Pillow lava), Volcanic breccia
- Lithofacies (Minor): Chert
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tsuchikurazawa creek, Kotaki, Itoigawa city, Niigata pref.; Uta, Itoigawa city, Niigata pref.
- Fossils (Radiolarians): Follicucullus sp., Nazarovispongus? sp., Paronaella? sp., Pseudoalbaillella aff. longicornis, Pseudotormentus sp.
- Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
- Niko and Ibaraki (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.259-262 DOI
- Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
- Ibaraki et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.423-426 DOI