Karasawa Lavas

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Karasawa Lavas Takahashi and Nishiki, 2006

Type locality: Karasawa creek, Saku city, Nagano prefecture
Volcanic rocks
early Pleistocene (1.00 - 0.98 Ma, K-Ar)

Lithofacies: Basalt
Lithofacies: Lavas (more than 10 flow units), Debris flow deposits

Source: Tokin-no-iwa rock - Okawara pass
Eruptive volume: 6.7 km³
Thickness (Overall): 30 - 350 m
Thickness (A unit): 1 - 5 m
Lower limit: Nagato Lavas

Kasuga Volcanic Rocks
[ Upper ]
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Okawaratoge Pyroclastics
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Karasawa Lavas
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Nagato Lavas
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Manitazawa Lava
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Mochizuki Volcaniclastics
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Tatamiishi Lava
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[ Lower ]

Tokin-no-iwa volcanic body
[ Upper ]
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Kasuga 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: 1,500 - 2,000 m above sea level, Karasawa creek - Kakuma river, Saku city, Nagano pref.; 1,100 - 1,450 m above sea level, Manita creek, Saku city, Nagano pref.

Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI