Mizuyama Formation

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Mizuyama Formation

Type locality: Iwai river, Mizuyama, Ichinoseki city, Iwate prefecture
Volcanic rocks
Miocene

Lithofacies: Dacite weded tuff
Lithofacies (Minor): Interbedded tuff, tuffaceous sandstone and siltstone
Lithofacies (Basal): Conglomerate

Thickness: 300 m
Upper limit: Unconformity (Odaira Formation, Kunimiyama Andesite)
Lower limit: Unconformity (Mizuyama Formation, Maekawa Formation)

Mount Yakeishidake, Iwate pref.
[ Upper ]
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Mizuyama Formation
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Orose Formation
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Maekawa Formation
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Nishikozawa Formation
'''''''/,,,,,,
Oidegawa Formation
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Oarasawa Formation
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[ Lower ]

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

Distribution: Iwai river, Mizuyama, Ichinoseki city, Iwate pref.; Isawa river, Orose, Oshu city, Iwate pref.; Shitomae river - Mount Kobiyama - Mount Takahino, Oshu city, Iwate pref.

Kitamura (1965) Yakeishi-dake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 8p.)