Yokomagaura volcano

[ Top ] [ Japanese ]

Yokomagaura volcano Isshiki, 1959

Type locality: Hachijo city, Tokyo
Volcanic rocks
Stratovolcano
Pleistocene - Holocene
Intruded by: Basalt - Andesite dikes

Lithofacies: Tholeiite series
Lithofacies: Augite hypersthene andesite, Hypersthene andesite lava, Tuff breccia
Lithofacies (Minor): Augite olivine basalt, Hypersthene augite olivine basalt scoriaceous lava

Upper limit: Unconformity (Pre-caldera cone)

Old volcanoes
[ Upper ]
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Kojima volcano
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Goshotai volcano
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Yokomagaura volcano
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[ Lower ]

Hachijojima volcano
[ Upper ]
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Nishiyama volcano
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Higashiyama volcano
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Old volcanoes
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[ Lower ]

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

Distribution: Yokomagaura, Hachijo city, Tokyo

Isshiki (1958) Hachijo-jima, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 5p.)