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Yamuke Formation Funayama and Kitamura, 1947
- Type locality: Mogami river, Yamuke, Masugata, Shinjo city, Yamagata prefecture
- Coherent formation
- Pliocene (3.7 - 3.0 Ma, FT)
- Correlation: Kannonji Formation, lower Oriwatari Formation
- Sedimentary facies (Upper): Marine
- Sedimentary facies (Lower): Fluvial
- Sedimentary facies (Upper, North): Fore shore, Upper shoreface
- Sedimentary facies (Upper, Center - South): Lower shoreface, Inner shelf
- Lithofacies (Upper): Sandstone
- Lithofacies (Lower): Interbedded sandstone and mudstone
- Lithofacies (Lower, Minor): Lignite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mogami river, Yamuke, Masugata, Shinjo city, Yamagata pref.; Oriwatari, Funagata city, Mogami county, Yamagata pref.; Iwaki - Ishinazaka, Sakekawa city, Mogami county, Yamagata pref.
- Tephra: HO
- Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.389-404 DOI
- Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.1-15 DOI
- Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)