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Otsu Formation Yamauchi and Dozen Research Group, 1997

• Type locality: Nishinoshima park, Nishinoshima city, Oki county, Shimane prefecture
• Coherent formation
• early - middle Miocene
• Intruded by: Oyama Quartz Syenite
• Correlation: Josoji Formation

• Sedimentary facies: Marine
• Lithofacies: Mudstone

• Upper limit: Unconformity (Ichibu Formation, , Takuhiyama Pyroclastic Cone)

• Distribution: Nishinoshima park - Mita dam, Nishinoshima city, Oki county, Shimane pref.
• Fossils: Foraminifera, Radiolarians

• Chiba et al. (2000) Geology of the Urago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 3p.)