Yabashira volcanoes

Yabashira volcanoes Nishiki et al., 2007

Early Pleistocene volcanoes of Yatsugatake volcanoes in Kitayatsugatake area was separated and re-defined as Yabashira volcanoes.

Type locality: Northern Mount Yatsugatake, Nagano prefecture
Volcanic rocks
early Pleistocene (1.2 - 0.8 Ma)

Lithofacies: Basalt, Andesite, Dacite

Eruptive volume: 172 km³

Upper limit: Unconformity (Usonokuchi Gravel Bed)

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: Northwest of Mount Yatsugatake, Nagano pref.

Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI
Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 DOI