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Koura Formation

• Type locality: Koura, Kashima village, Matsue city, Shimane prefecture
• Coherent formation
• early Miocene (20 - 18 Ma)

• Sedimentary facies (Upper): Brackish
• Sedimentary facies (Middle): Fluvial, Lacustrine
• Sedimentary facies (Lower): Fluvial, Lacustrine
• Lithofacies: Conglomerate, Sandstone
• Lithofacies (Minor): Shale, Andesite lava, Pyroclastic surge deposit, Rhyolite pyroclastic flow deposit, Volcanic debris flow deposit

• Upper limit: Bottom of black shale dominated beds of Josoji Formation

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

• Distribution: Shimane peninsula, Shimane pref.
• Distribution: Hoda, Mihonoseki village, Matsue city, Shimane pref.
• Fossils: Daijima flora
• Fossils (Upper): Corbicula sp.
• Fossils (Middle- Lower): Animals, Plants, Shellfishes (Freshwater)

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Nomura et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.2, pp.95-109 DOI
• Sakai et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.285-299 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