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Ikenouchi Formation Suzuki et al., 1990
- Type locality: Ikenouchi, Minamiboso city, Chiba prefecture
- Coherent formation
- Landward slope basin of trench
- early - middle Pleistocene
- Sedimentary facies: Marine
- Lithofacies: Mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ikenouchi - Shimohori - Masakioka - Karagasaku - Higashikoto, Minamiboso city, Chiba pref.; Eda - Takinotani, Tateyama city, Chiba pref.
- Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)