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Jinzai Formation Takayasu and Nakamura, 1984

• Type locality: Lake Jinzaiko, Jinzai, Izumo city, Shimane prefecture
• Coherent formation
• Miocene (14 - 13 Ma)
• Correlation: Matsue Formation

• Sedimentary facies: Marine, Brackish
• Depth of water: Shallow - Continental shelf
• Depth of water (Upper): Tidal zone
• Depth of water (Lower): Upper sublittoral zone
• Depth of water (Upper): 0 - 50 m
• Depth of water (Lower): 20 - 50 m
• Lithofacies: Conglomerate, Sandstone, Siltstone
• Lithofacies (Bottom): Alkali basalt lava, Pyroclastic rocks
• Lithofacies (Minor): Lignite
• Sedimentary structures: Parallel stratification, Ripple stratification

• Thickness: 330 m or thicker
• Upper limit: Unconformity (Sashimi Formation)

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

• Distribution: Jinzai - Chiimiya town - Oda, Izumo city, Shimane pref.
• Fossils: Pipe rocks
• Fossils (Shellfishes): Crassostrea gigas, Laevicardium? shiobarense, Phacosoma hataii

• 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
• Sato et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.439-450 DOI
• Kano et al. (1998) Geology of the Iwami-Oda and Oura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 118p. (in Japanese with English abstract 5p.)
• Kano et al. (1994) Geology of the Matsue District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 126p. (in Japanese with English abstract 5p.)
• Kano et al. (1991) Geology of the Imaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 5p.)