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Shioi Formation
- Type locality: Nara prefecture
- Coherent formation
- Miocene
- Sedimentary facies: Fluvial
- Sedimentary facies: Alluvial fan
- Lithofacies: Conglomerate
- Lithofacies (Minor): Sandstone
- Sedimentary structures: Graded bedding, Channel structure
- Thickness: 0 - 70 m
- Lower limit: Unconformity (Ryoke Belt)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Igami - Nagano - Shioi, Soni city, Uda county, Nara pref., Shikizu, Mitsue city, Uda county, Nara pref.; Ono - Fukano, Muro, Uda city, Nar a pref.; Toro - Yachi - Ishinahara, Misugi town, Tsu city, Mie pref.
- Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI
- Nishioka et al. (2001) Geology of the Sakurai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 141p. (in Japanese with English abstract 5p.)
- Nishioka et al. (1998) Geology of the Nabari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 5p.)