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Sada Formation Sawada et al., 2008
- Type locality: Yawatabara, Sada village, Izumo city, Shimane prefecture
- Coherent formation
- early Miocene (21.8, 19.3 - 16.9 Ma, K-Ar)
- Lithofacies: Basaltic andesite - andesite - dacite - rhyolite lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yawatabara - Takatsuya, Sada village, Izumo city, Shimane pref.
- Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
- Sawada et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.267-284 DOI