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Omori Formation
- Coherent formation
- middle Miocene (14.8, 14.6, 13.7 Ma, K-Ar)
- Sedimentary facies (Upper): Shallow marine
- Sedimentary facies (Lower): Terrestrial, Shallow marine
- Depth of water: Shallow
- Lithofacies (Upper): Conglomerate, Sandstone, Turbidite
- Lithofacies (Lower): Andesite - Dacite - Rhyolite lava, Pyroclastic rocks, Tuffaceous clastic rocks
- Lithofacies (Bottom): Conglomerate
- Lithofacies (Minor): Basalt - andesite - dolerite - porphyrite dikes
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Gotsu city - Oda city, Shimane pref.; Mount Kasen, Matsue 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
- Hayashi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.300-311 DOI
- Sato et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.439-450 DOI
- Utada (2007) Jour. Geol. Soc. Japan, vol.113, no.8, pp.438-453 DOI