Yatsugatake volcanoes

Classification by Older period and Younger period was modified recently but strata described based on old definitions when new definition has not been described.

The volcanic activity at northern Yatsugatake area is separated as Yabashira volcanoes.

Type locality: Mount Yatsugatake, Nagano prefecture
Volcanic rocks
middle Pleistocene or later (ca. 50 - 0.0 Ma)

Yatsugatake volcanoes (North of Natsuzawa pass)
[ Upper ]
+__+__+__+__+_
Northern Yatsugatake volcanoes
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[ Lower ]

Yatsugatake volcanoes (South of Natsuzawa pass)
[ Upper ]
+__+__+__+__+_
Southern Yatsugatake volcanoes
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[ Lower ]

Yatsugatake volcano
[ Upper ]
+__+__+__+__+_
Younger period
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Older period
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[ Lower ]

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

Distribution: Mount Yatsugatake, Nagano pref.

Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 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.)
Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)
Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)