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Soni Formation Shiida et al., 1960
Invalid synonym: Soni Group, Muro Group
- Lithofacies (Upper): Pyroclastic flow deposit
- Lithofacies (Lower): Conglomerate, Interbedded sandstone and mudstone
- Thickness (Upper): ca. 400 m
- Thickness (Lower): 30 m or thinner
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shimotaguchi, Uda city, Nara pref.; Takigawa river - Byobu-iwa - Mount Yoroidake - Mount Sumitsukayama - Mount Kurosoyama, Soni city, Uda county, Nara pref.; Mount Oborayama - Mount Amagatake, Misugi town, Tsu city, Mie pref.
- Fossils (Lower): Styrax microcarpa
- 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.)