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N1
- Type locality: Mount Toragamine - Hirose, Tanabe city, Wakayama prefecture
- Accretionary complex
- Paleogene, or Late Cretaceous, Campanian
- Sedimentary facies: Marine
- Sedimentary facies: Continental shelf, Upper continental slope
- Lithofacies: Mudstone-dominant interbedded sandstone and mudstone
- Lithofacies (Minor): Felsic tuff
- Lithofacies: Shale, Gravel-bearing mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Thickness: 140 - 850 m or thicker
- Nyunokawa Formation
- [ Upper ]
- /--/--/--/--/-
- N5
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- N4
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- N3
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- N2
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- N1
- /--/--/--/--/-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Toragamine - Hirose - Sasanokawa river - Totsugawa river, Tanabe city, Wakayama pref.
- 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.)