Oshosan products

Volcanic rocks
Pleistocene (0.6 - 0.4 Ma, K-Ar/FT)

Lithofacies: Calc-alkaline series
Lithofacies (Minor): Tholeiite series
Lithofacies: Andesite
Lithofacies: Lava, Volcanic breccia, Pyroclastic flow deposit

Source: northwest of Mount Oshosan
Volume: ca. 15 km³

Oshosan products
[ Upper ]
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Sennyodaira Lava
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Maegatake Lava
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Yamazaki Debris Avalanche Deposit
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Oshosan Lava
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Otaki Lava
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Akagidaira Lava
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Maegatakenishi Lava
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Choshigataki Lava
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Yakushidake Lava
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Choshigataki Pyroclastic Flow Deposit
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Dake Lava
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Nagasaka Pyroclastic Flow Deposit
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Endogataki Lava
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[ Lower ]

Adatara volcano
[ Upper ]
+__+__+__+__+_
Minowasan-Adatarayama products
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Oshosan products
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Sogodai Lava
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Numajiri Pyroclastic Flow Deposit
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[ Lower ]

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

Distribution: Mount Adatara, Fukushima pref.

Sakaguchi (1995) Geology of the Nihonmatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 4p.)