Junitaki Acid Volcanic Rock

[ Top ] [ Japanese ]

Junitaki Acid Volcanic Rock Sato, 1986

Volcanic rocks
Submarine volcanic edifice
Lava dome, Intrusive rocks
Miocene

Sedimentary facies: Marine
Lithofacies: Rhyolite - andesite lava, Volcanic breccia, Tuff breccia
Lithofacies (Minor): Andesite lava

Lower limit: Conformity (Omatagawa Mudstone Member)

Aosawa Formation (Shonai)
[ Upper ]
--------------
Junitaki Acid Volcanic Rock
--------------
Taizoyama Andesite
--------------
Lower part
--------------
[ Lower ]

Aosawa Formation (Shinjo)
[ Upper ]
--------------
Hachimori Andesite
--------------
Omatagawa Mudstone Member
--------------
[ Lower ]

Kisakata - Yashima, Akita pref.
[ Upper ]
--------------
Onnagawa Formation
--------------
Aosawa Formation
--------------
Yashiozawakawa Formation
?--?--?--?--?-
[ Lower ]

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

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

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

Distribution: Mount Yakushi, Kaneyama city, Mogami county, Yamagata pref.; Junitaki fall - Sumiishi, Sakata city, 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.)