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Tsuchishio Formation
- Sedimentary facies: Marine
- Lithofacies: Diatomic siltstone
- Lithofacies (Minor): Sandstone, Felsic tuff
- Thickness: ca. 300 m
- Upper limit: Conformity (Yagii Formation)
- Upper limit: Lithofacies boundary
- Lower limit: Konan Fault (corresponds to Niwaya Unconformity, 15.4 - 15.1 Ma)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ara river, Yorii city, Saitama pref.
- Arai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.223-241 DOI
- Takahashi and Yanagisawa (2004) Jour. Geol. Soc. Japan, vol.122, no.12, pp.625-635.
- Makimoto and Takeuchi (1992) Geology of the Yorii District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)