Okuro Lava

Okuro Lava Ozawa and Sumi, 1958

Type locality: Okuro creek, Tazawako, Senboku city, Akita prefecture
Volcanic rocks
Stratovolcano
Pleistocene (2.2 Ma, K-Ar)

Lithofacies: Augite-bearing olivine basalt, Anorthite-bearing hypersthene andesite
Lithofacies: Lava, Tuff breccia, Tuff

Pre-caldera stratovolcano
[ Upper ]
~~~~~~~~~~~~~~
Maego Lava
~~~~~~~~~~~~~~
Okuro Lava
~~~~~~~~~~~~~~
Kowase Altered Andesite
~~~~~~~~~~~~~~
[ Lower ]

Pre-caldera stratovolcano
[ Upper ]
~~~~~~~~~~~~~~
Akazawa Lava
~~~~~~~~~~~~~~
[ Lower ]

Kayodake volcano
[ Upper ]
~~~~~~~~~~~~~~
Post-caldera lava
~~~~~~~~~~~~~~
Parasitic cone
~~~~~~~~~~~~~~
Pre-caldera stratovolcano
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Okuro creek, Tazawako, Senboku city, Akita pref.; Sendatsu river, Shizukuishi city, Iwate county, Iwate pref.

Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)
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.)
Ozawa and Sumi (1958) Tazawako, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 23p. (in Japanese with English abstract 4p.)