Byobuiwa volcanic body

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Byobuiwa volcanic body

Type locality: Nagano prefecture
Volcanic rocks
early Pleistocene (0.9 - 0.85 Ma)

Lithofacies: Hypersthene augite andesite, Dacite lava (3 flow units)

Eruptive volume: 3.7 km³
Thickness: 20 m
Running distance: 8 km
Lower limit: Unconformity (Kasuga Volcanic Rocks)

Byobuiwa volcanic body
[ Upper ]
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Fukinotaira Volcanic Rocks
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[ Lower ]

Yabashira volcanoes
[ Upper ]
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Kengamine volcanic body
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Byobuiwa volcanic body
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Yabashirayama volcanic body
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Ryugamine volcanic body
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Tokin-no-iwa volcanic body
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[ Lower ]

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

Distribution: Hosokoji river, Kasuga, Saku city, Nagano pref.

Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI
Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)