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Tonono Formation
- Type locality: Miyatanigawa river, Gojo city, Nara prefecture
- Accretionary complex
- Early Cretaceous
- Sedimentary facies: Marine
- Lithofacies: Sandstone, Shale, Slate
- Lithofacies (Minor): Chert, Limestone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Miyatanigawa river - Funanokawa river, Gojo city, Nara pref.; Amanokawa river, Tenkawa city, Yoshino county, Nara pref.
- Fossils (Radiolarians): Alievium sp., Archaeodictyomitra cf. conica, Archaeodictyomitra cf. elegantissima, Archaeodictyomitra cf. praevenata, Archaeodictyomitra cf. sliteri, Cryptomphorella sp., Dicolocapsa sp., Dictyomitra cf. carpatica, Gongylothorax sp., Hemicryptocapsa sp., Hemiptocapsa sp., Mirifusus sp., Praeconocaryomma sp., Protunuma cf. brouweri, Stichocapsa sp., Tricolocapsa sp., Zhamoidellum sp.,
- Shiida et al. (1989) Geology of the Sanjogatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 100p. (in Japanese with English abstract 5p.)