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Nyunokawa Formation Kishu Shimanto Research Group, 1977

Invalid synonym: Hatenashi Group

Various interpretations are under discussion: Hidakagawa Group, Otonashigawa Group, or a part of Uridani Formation in Shimanto Supergroup.

• Type locality (N1, N2): Mount Toragamine - Hirose, Tanabe city, Wakayama prefecture
• Type locality (N3, N4, N5): Sakatai - Kazai - Kshokuchi, Tanabe city, Wakayama prefecture
• Accretionary complex
• Paleogene, or Late Cretaceous, Campanian

• Sedimentary facies: Marine
• Sedimentary facies: Continental shelf, Upper continental slope
• Lithofacies: Terrigenous coarse clastic rocks
• Lithofacies (Minor): Green rocks

• Thickness: 2,900 - 3,300 m
• Upper limit: Gobo - Totsukawa Thrust fault
• Lower limit: Hatenashi Thrust fault, Gobo - Hagi Tectonic Line

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

• Distribution: Higashi - Nyunogawa river, Ryujin town, Tanabe city, Wakayama pref.; Mount Toragamine - Hirose - Sakatai - Kazai - Kshokuchi, Tanabe city, Wakayama pref.; Kamiyukawa river, Totsukawa city, Yoshino county, Nara pref.;

• Tokiwa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.12, pp.625-635, DOI
• Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI
• Tokiwa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.6, pp.270-273 DOI
• Win et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.4, pp.133-145 DOI
• Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)