Oshiromoriyama Lavas

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Oshiromoriyama Lavas

Invalid synonym: Oshiromori Lava domes

Volcanic rocks
early Pleistocene
Intruded in: Lacustrine deposit, Kasshi Volcanic Rocks

Sedimentary facies: Terrestrial
Lithofacies: Hornblende orthopyroxene clinopyroxene dacite, Orthopyroxene clinopyroxene dacite

Tonohetsuri Formation
[ Upper ]
~~~~~~~~~~~~~~
Nagurasawa Pyroclastic Flow Deposit = Post-caldera stage
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Kasshi Volcanic Rocks / Oshiromoriyama Lavas / Lacustrine deposit = Post-caldera stage
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Ashino Pyroclastic Flow Deposit = Caldera-forming stage
~~~~~~~~~~~~~~
[ Lower ]

Tonohetsuri caldera
[ Upper ]
~~~~~~~~~~~~~~
Tonohetsuri Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Matami - Mount Nakayama - Mount Takakura - Mount Kamafusa - Mount Nabeyama, Shimogo city, Minamiaizu county, Fukushima pref.; Mount Oshiromori - Mount Koshiromori, Tenei city, Iwase county, Fukushima pref.

Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)