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Otaki Mudstone and Tuff Member Ozawa and Sumi, 1961

• Coherent formation
• late Miocene

• Lithofacies: Mudstone, Tuff
• Lithofacies (Minor): Sandstone, Volcanic conglomerate

• Thickness: 130 - 200 m
• Lower limit: Bottom of the volcanic conglomerate member or the tuff-bearing horizon
• Lower limit: Transitional (Kagamizawa Mudstone Member)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: 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.)