Kasshi Volcanic Rocks

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Kasshi Volcanic Rocks

Formerly considered as a member of Kasshiasahidake volcano.

Volcanic rocks
early Pleistocene
Interfingered: Lacustrine deposit
Intruded by: Oshiromoriyama Lavas

Sedimentary facies: Terrestrial
Lithofacies: Orthopyroxene clinopyroxene andesite lava, Volcanic breccia (Hyaloclastite), Tuff breccia
Lithofacies (Minor): Siltstone, Sandstone

Thickness: ca. 500 m
Upper limit: Conformtiy (Nagurasawa Pyroclastic Flow Deposit), Unconformity (Kasshiasahidake volcano)

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 Kashi - Mount Kashi-Asahidake, Nishigo city, Nishishirakawa 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.)