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Kaibushi Member Otsuka, 1944
- Type locality: Kaibushi, Shimizu ward, Shizuoka city, Shizuoka prefecture
- Coherent formation
- Trough basin-fill deposit at the collision boundary between Izu-Bonin-Mariana arc and Southwest - East Japan island arc
- Back-arc basin volcanic activity at the back-arc basin of Izu-Bonin-Mariana arc
- late Miocene (Foraminifera)
- Correlation: Jishabatake Formation
- Sedimentary facies: Marine
- Lithofacies: Mudstone
- Lithofacies (Minor): Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kaibushi - Okitsugawa river, Shimizu ward, Shizuoka city, Shizuoka pref.; Tsukiyonodan, Narushima, Nanbu city, Minamikoma county, Yamanashi pref.
- Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)