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Nishimyo Formation Niigata prefecture, 1963
Invalid synonym: Shitagura Tuff Breccia
- Type locality: Nishimyo, Uonuma city, Niigata prefecture
- Coherent formation
- Miocene (16 - 14 Ma, Diatoms, Foraminifera)
- Correlation: Nanatani Formation
- Intruded by: Porphyrite dyke
- Sedimentary facies: Marine
- Sedimentary facies: Submarine pyroclastic flow deposit
- Lithofacies: Rhyolite - Dacite tuff breccia, Pumice tuff, Tuff, Mudstone
- Lithofacies (Minor): Rhyolite, Dacite lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nishimyo - Mount Toyagamine - Shitagura - Koide - Suhara, Uonuma city, Niigata pref.
- Fossils (Foraminifera): Globigerina praebulloides, Globoquadrina venezuelana, Globorotalia scicula praescitula, Hopkinsina shinboi, Orbulina suturalis
- Fossils (Diatoms): Actinocyclus cfr. ellipticus, Actinocyclus ingens var. ingens, Actinocyclus var. nodus, Actinocyclus moronensis, Actinocyclus octanarius, Actinoptychus senarius, Actinoptychus splendens, Arachnoidiscus sp., Cestodiscus pepulum, Clavicula polymorpha, Cocconeis scutellum, Cocconeis vitrea, Coscinodiscus endoi, Coscinodiscus lewisianus, Coscinodiscus marginatus, Coscinodiscus perforatus, Coscinodiscus praenodulifer, Coscinodiscus radiatus, Coscinodiscus vetustissimus, Crucidenticula ikebei, Cymatosira aff. loreziana, Diploneis cfr. smithii, Delphineis penelliptica, Delphineis surirella, Denticula norwegica, Denticulopsis hyalina, Denticulopsis lauta, Denticulopsis praelauta, Grammatophora spp., Goniothecium odontella, Hemiaulus polymorphus, Kisseleviella carina, Liradiscus bipolaris, Mediaria splendida, Melosira scopos, Melosira sol, Nitzschia challengeri, Odontell aurita, Paralia sulcata, Planifolia tribranchiata, Porosira gracilis, Pseudodimerogramma elongata, Pseudodimerogramma filiformis, Rhaphidodiscus marylondicus, Rhaphoneis gemifera, Rhaphoneis miocenica, Rhaphoneis parilis, Rhizosolenia interposita, Rouxia naviculoides, Rossiella paleucea, Rutiralia epsiron var. longicornis, Sawamuraia quadriseriata, Stephanodiscus sp., Stephanogoia hanzawae, Stephanopyxis turris, Symbolophora spp., Synedra jouseana f. jouseana, Synedra jouseana f. linealis, Thalassionema nitzschioides,Thalassiosira leptopus, Thalassiothrix lungissima, Thalassiothrix miocenica, Triceratium arcticum, Triceratium condecorum, Trochosira spinosa, Zircoceras sp.
- Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI
- Takahashi et al. (2004) Geology of the Suhara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 80p. (in Japanese with English abstract 4p.)
- Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)