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Ochi Group Research Group for the San'in Late Mesozoic Igneous Activity, 1979

Invalid synonym: Akatsuka Rhyolite

• Type locality: Ichiibara - Yadani, Kawamoto, Ochi county, Shimane prefecture
• Volcanic rocks
• Late Cretaceous (92 Ma, FT)
• Intruded by: Takahata Granite, Onbara Granite, Kawamoto body,Mihara body, Asuna Granite, Ijimi Granite
• Correlation: Takada Rhyolites

• Lithofacies: Rhyolite - Dacite lapilli tuff, Tuff

• Upper limit: Unconformity (Takahoriyama Formation, Takayama Volcanic Rocks)

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

• Distribution: Ichiibara - Hanbe - Yadani - Tada, Kawamoto, Ochi county, Shimane pref.; Shirinashigawa river - Somori - Takahata - Hongo - Hamahara dam - Motoyama - Mukatani - Take - Hibira, Misato city, Ochi county, Shimane pref.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Kano et al. (2001) Geology of the Yunotsu and Gotsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 129p. (in Japanese with English abstract 5p.)
• Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)