Older Ontake Volcanic Rocks

Volcanic rocks
Composite stratovolcano
middle Pleistocene (0.75 - 0.42 Ma)

Lithofacies: Andesite - Basalt
Paleocurrent (Lava): to Southwest - West
Paleocurrent (Pyroclastic rocks): to Northeast - East

Eruptive volume: ca. 80 km³

Older Ontake Volcanic Rocks
[ Upper ]
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Mikasayama volcano
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Kamidawarayama volcano
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Tsuchiurazawa volcano
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Tobu volcano
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[ Lower ]

(Invalid) Older Ontake Volcanic Rocks
[ Upper ]
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(Invalid name) Mikasayama Lava = Mikasayama volcano
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(Invalid name) Mizoguchigawa Lava
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(Invalid name) Nunokawa Lava
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(Invalid name) Suzugasawa Lava
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(Invalid name) Sengendaru Lava = Nigorigo volcano
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(Invalid name) Kuragoehoara Lava = Tobu volcano
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(Invalid name) Makuiwagawa Lava
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(Invalid name) Hakotani Lava
~~~~~~~~~~~~~~
(Invalid name) Shiranunodani Lava
~~~~~~~~~~~~~~
(Invalid name) Tsuchiurazawa Lava = Tsuchiurazawa volcano
~~~~~~~~~~~~~~
[ Lower ]

Ontake volcano
[ Upper ]
~~~~~~~~~~~~~~
Younger Ontake Volcanic Rocks
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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.)