Ochi Group

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

Invalid synonym: Akatsuka Rhyolite

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 lapilli tuff, Tuff

Upper limit: Unconformity (Takahoriyama Formation)

Ochi Group
[ Upper ]
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Yadani Formation
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Ichiibara Formation
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[ Lower ]

Mochigase stage volcanic rocks
?--?--?--?--?-
Hikimi Group
?--?--?--?--?-
Abu Group
?--?--?--?--?-
Ochi Group
?--?--?--?--?-
Yakumo Volcanic Rocks
?--?--?--?--?-

Sanin Belt
[ Young ]
~~~~~~~~~~~~~~
Tamagawa stage volcanic rocks
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Younger Inbi stage intrusive rocks
?--?--?--?--?-
Older Inbi stage intrusiv rocks
?--?--?--?--?-
Inbi stage volcanic rocks
~~~~~~~~~~~~~~
Mochigase stage intrusive rocks
?--?--?--?--?-
Mochigase stage volcanic rocks
~~~~~~~~~~~~~~
[ Old ]

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

Distribution: Ichiibara - Hanbe - Yadani, Kawamoto, 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.)