Oyachi Lava

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Oyachi Lava

Type locality: Oyachi creek, Hachimantai city, Iwate prefecture
Volcanic rocks
Pleistocene - Holocene

Lithofacies: Augite hypersthene olivine basalt lava
Lithofacies (Minor): Agglomerate, Interbedded lava and agglomerate

Chausudake volcano
[ Upper ]
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Maemoriyama Lava
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Iwahatayama Lava
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Chausudake Lava
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Onagane Lava
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Oyachi Lava
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Daikokumori Agglomerate
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Marumori Tuff
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Lower Onagane Lava
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Ishiyama Lava
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Kamotayamagairinzan Lava
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[ Lower ]

Hachimantai volcanic group
[ Upper ]
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Obukadake volcano
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Chausudake volcano
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Hachimantai volcano
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[ Lower ]

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

Distribution: eastern Mount Chausu 1,490 m peak - Oyachi creek - Appi river - Akazawa creek, Hachimantai city, Iwate pref.

Kawano and Uemura (1964) Hachimantai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 36p. (in Japanese with English abstract 8p.)