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Younger period
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)
- Younger period (Mount Nakayama)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Nakayama Lava
- ~~~~~~~~~~~~~~
- [ Lower ]
- Younger period (Mount Tengudake)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ashidaira Lava
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Yatsugatake, Nagano pref.
- 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.)