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Sanno Formation
- Type locality: Sanno, Kamogawa city, Chiba prefecture
- Coherent formation
- Sedimentary facies: Marine
- Lithofacies: Shale
- Lithofacies (Minor): Marl, Siltstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sanno - Takiyama - Shiratakifudo - Fukawa, Kamogawa city, Chiba pref.
- Nakajima et al. (1981) Geology of the Kamogawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 7p.)