Shirashima Rhyolite

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Shirashima Rhyolite

Volcanic rocks
late Miocene
Contemporaneous heterotopic facies: Yokooyama Trachyte

Lithofacies: Rhyolite lava

Upper part (North)
[ Upper ]
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Shirashima Rhyolite / Yokooyama Trachyte
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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 ]
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Omosu Formation
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Tsuma Formation
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[ Lower ]

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

Distribution: Shirashima seashore, Okinoshima city, Oki county, Shimane pref.
Tephra: Pyroclastic Rock 12

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.)