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Otonashigawa Group Hatenashi Research Group, 1977
Invlid synonym: Otonashigawa Belt, Inami Formation, Inami Group, Otonashimuro Formation
- Accretionary complex
- Paleocene - Eocene
- Intruded by: Felsic pyroclastic dikes, Quartz porphyry dikes
- Sedimentary facies: Marine
- Thickness: 1,400 - 1,800 m or thicker
- Upper limit: Unconformity (Kumano Group, Tanabe Group)
- Northern limit: Gobo - Totsukawa Thrust fault, Gobo - Hagi Tectonic Line
- Southern limit: Chikatsuyu Thrust fault, Hongu - Minachi fault
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Kirime - Cape Hatano, Inami city, Hidaka county Wakayama pref.; Fuzono - Chikatsuyu - Fukusada, Tanabe city, Wakayama pref.
- Tokiwa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.12, pp.625-635, DOI
- Bessho and Nakaya (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.423-438 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.)
- Suzuki et al (1979) Geology of the Kurisugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 5p.)
- Murayama (1954) Shingu, Atawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 6p.)