Takasaka Acid Volcanic Rock

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Takasaka Acid Volcanic Rock (Taguchi, 1959) Tsuchiya, 1989

Invalid synonym: Takasaka Green Tuff Member

Volcanic rocks
Miocene

Sedimentary facies: Lava flow, Lava dome
Lithofacies: Rhyolite - Dacite lava, Volcanic breccia (Hyaloclastite), Tuff breccia, Pumice tuff
Lithofacies (Minor): Andesite tuff breccia

Thickness: 300 m or thinner
Upper limit: Conformity (Kamikomata Sandstone and Conglomerate Member)
Lower limit: Conformity (Kabuyama Andesite), Interfingered (Kusanagi Formation)

Kusanagi Formation (Sakata, Yamagata pref.)
[ Upper ]
--------------
Kannonji Basalt
--------------
[ Lower ]

Kusanagi Formation (Shinjo, Yamagata pref.)
[ Upper ]
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Kamikomata Sandstone and Conglomerate Member
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Takasaka Acid Volcanic Rock
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Kabuyama Andesite
--------------
[ Lower ]

Shinjo basin, Yamagata pref.
[ Upper ]
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Furukuchi Formation
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Kusanagi Formation
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Aosawa Formation
?--?--?--?--?-
[ Lower ]

Fukura, Yamagata pref.
[ Upper ]
--------------
Kusanagi Formation
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Okawa Formation
?--?--?--?--?-
[ Lower ]

Sakata - Tsuruoka, Yamagata pref.
[ Upper ]
--------------
Kitamata Formation
--------------
Kusanagi Formation
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Aosawa Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Yamagata pref.

Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)