Goka Rhyolite

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Goka Rhyolite

Volcanic rocks
late Miocene

Lithofacies: Rhyolite lava (3 flow units)

Distribution (Major axis, 2nd flow unit): 5 km
Thickness (2nd flow unit): ca. 50 - 370 m

Goka Rhyolite
[ Upper ]
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Mimizaki Trachyte
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[ Lower ]

Lower part (West)
[ Upper ]
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Goka Rhyolite
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[ Lower ]

Omosu Formation
[ Upper ]
~~~~~~~~~~~~~~
Upper part
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Middle part
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Lower part
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[ Lower ]

Oki-Dogo island, Shimane pref.
[ Upper ]
~~~~~~~~~~~~~~
Omosu Formation
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Tsuma Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Dakesan - Shiro - Kori - Omosu bay - Mount Takaosan - Fukuura - Nagaoda, Okinoshima city, Oki county, Shimane pref.
Tephra: Pyroclastic Rock 1, Pyroclastic Rock 2, Pyroclastic Rock 3

Yamauchi et al. (2009) Geology of the Saigo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 118p. (in Japanese with English abstract 3p.)