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Susai Formation Suzuki et al., 2003
- Type locality: Akaiwashi-Yoshii ground, Kuso, Akaiwa city, Okayama prefecture
- Coherent formation
- Eocene, Priabonian - Oligocene, Rupelian (34.3 Ma, FT; 32.61 Ma, U-Pb)
- Correlation: Tomiyoshi Formation
- Sedimentary facies: Fluvial
- Lithofacies: Conglomerate
- Lithofacies (Minor): Sandstone
- Sedimentary structures: Imbricate structure
- Paleocurrent: from North to South
- Thickness: 10 - 30 m or thicker
- Lower limit: Unconformity (Ejiri Unit, Cretaceous igneous rocks)
- Kibi Group (Akaiwa, Okayama pref.)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Susai Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Susai - Yoshiigawa river - Tonodani - Hieda - Sakuragaoka - Sanyo - Nagao - Kuso - Lake Okandaike, Akaiwa city Okayama pref.; Chichiibara, Wake city, Wake county, Okayama pref.; Jodokitagawa - Urama, Okayama city, Okayama pref.
- Sato et al. (2022) Geology of the Wake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 106p. (in Japanese with English abstract 4p.)
- Sato et al. (2016) Geology of the Banshu-Ako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p. (in Japanese with English abstract 3p.)
- Suzuki et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.139-151 DOI