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Ichido Mudstone and Sandstone Member Mikami, 1955
- Type locality: Ichido, Atsugi city, Kanagawa prefecture
- Coherent formation
- Trough-fill deposit at the collision boundary between Oceanic arc of Paleo-Izu-Bonin arc (Ocean crust) and Honshu arc (Island arc)
- late Miocene
- Sedimentary facies: Marine
- Lithofacies: Interbedded conglomerate and sandstone, Interbedded sandstone and mudstone
- Lithofacies (Minor): Dacite tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ichido - Daimon?, Atsugi city, Kanagawa pref.
- Oka et al. (1979) Geology of the Fujisawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 5p.)