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Kawai Formation

Invalid synonym: Oro Formation (a part of Kawai Formation)

• Coherent formation
• middle Miocene (15.4 Ma, K-Ar)

• Sedimentary facies: Marine
• Sedimentary facies (Minor): Lacustrine
• Lithofacies: Conglomerate, Sandstone, Andesite hyaloclastite, Dacite submarine pyroclastic flow deposit, Rhyolite lava, Volcanic debris flow deposit

• Thickness: 100 m or thicker
• Upper limit: Interfinggered (Kuri Formation)
• Lower limit: Lithofacies boundary (bottom of felsic tuff), Unconformity (Sada Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Gotsu city - Oda city, Shimane, Shimane pref.; Shinji village, Matsue city, Shimane pref.; Yonago city, Shimane pref.; Takakubo, Mitoya village, Unnan city, Shimane pref.
• Fossils: Plants, Shellfishes (Freshwater), Vicarya cf. japonica, Anadara daitokudoensis, Foraminifera, Fishes, Diatoms

• 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