Younger Ontake Volcanic Rocks

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Younger Ontake Volcanic Rocks

Volcanic rocks
Composite stratovolcano
middle Pleistocene - Present (ca. 90 - 0 ka)

Lithofacies (Upper): Andesite
Lithofacies (Lower): Rhyolitic dacite

Younger Ontake Volcanic Rocks
[ Upper ]
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Marishiten volcano group
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Takigoshi Formation
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Mamahahadake volcano group
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[ Lower ]

Younger Ontake Tephra Group
[ Upper ]
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Younger Ontake Tephra Group (Upper)
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Younger Ontake Tephra Group (Lower)
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[ Lower ]

Ontake volcano
[ Upper ]
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Younger Ontake Volcanic Rocks
~~~~~~~~~~~~~~
Older Ontake Volcanic Rocks
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[ Lower ]

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

Distribution: Gifu pref., Nagano pref.

Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)