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Nambayama Formation Omura, 1930
Invalid synonym: Nanbayama Formation, Kubiki Group, Hiuchiyama Formation, Nishihiyama Formation, Shiundani Formation, Hiyama Formation
- Type locality: Shiun valley - Kanba creek, Nadachi river, Nadachi ward, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- middle Miocene (13.5 - ? Ma)
- Intruded by: Nishikubiki Hypabyssal Rocks
- Sedimentary facies: Marine
- Sedimentary facies: Submarine fan (Sandy radial fan type)
- Sedimentary facies: 5 times marine regression - transgression sequences
- Sedimentary facies: Turbidite
- Depth of water: Middle bathyal (Foraminifera)
- Lithofacies: Interbedded sandstone and mudstone, Shale
- Lithofacies (Minor): Gravel-bearing mudstone, Glendonite
- Sedimentary structures: Groove marks, Flute marks, Rpple marks, Load structure, Slump structure, Clastic dykes
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shiun valley - Kanba creek - Nadachi river, Nadachi ward, Joetsu city, Niigata pref.; Tsunako river - Nakanomata river - Nishiyachi river - Kuwatori river - Nogawa river - Mount Shigekura, Joetsu city, Niigata pref.; Mount Aota-Nanbayama - Mount Kagomachi-Nanbayama - Mount Awadachiyama, Myoko city, Niigata pref.;
- Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
- Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
- Akahane and Kato (1989) Geology of the Takada-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 3p.)