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Tsunotani Formation Yoshida, 1961

• Type locality: Tsunotanigawa river, Misato city - Onan city, Ochi county, Shimane prefecture
• Accretionary complex
• late Paleozoic?
• Intruded by: Onbara Granite, Asuna Granite, Granite porphyry dikes, Basalt dikes

• Lithofacies: Hornfels
• Lithofacies (Protolith): Sandstone
• Lithofacies (ProtolithMinor): Shale, Conglomerate

• Thickness: 400 m or thicker
• Upper limit: Unconformity (Yadani Formation, Shinzojiyama Rhyolites)

• Distribution: Tsunotanigawa river, Misato city - Onan city, Ochi county, Shimane pref.; Utsui - Mount Seigojiyama? - Takami, Onan city, Ochi county, Shimane pref.; Kotakuji, Misato city, Ochi county, Shimane pref.

• Matsuura (1990) Geology of the Akana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)