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Takasawa Sandstone Member Ozawa and Sumi, 1961
- Type locality: Mamuro river, Takasawa, Mamurogawa city, Mogami county, Yamagata prefecture
- Coherent formation
- Miocene - Pliocene
- Lithofacies: Sandstone
- Lithofacies (Minor): Pumice tuff, Lignite, Conglomerate, Siltstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mamuro river, Takasawa - Kawanouchi - Mokkoe - Ninomatsu - Uchimachi, Mamurogawa city, Mogami county, Yamagata pref.
- Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)