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Stage IIIb
- Type locality: Mount Chokai, Yamagata prefecture - Akita prefecture
- Stratovolcano
- East Chokai central cone
- Volcanic rocks
- Holocene (AD 1801 -)
- Stage IIIb
- [ Upper ]
- +__+__+__+__+_
- AD 1974 Phreatic explosion
- ~~~~~~~~~~~~~~
- AD 1834 eruption
- ~~~~~~~~~~~~~~
- Shizan Lava
- ~~~~~~~~~~~~~~
- AD 1740 eruption
- ~~~~~~~~~~~~~~
- AD 1659 eruption
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- AD 871 eruption
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- Kojingatake Lava
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Chokai, Yamagata - Akita pref.
- Hayashi and Yamamoto (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.87-95 DOI
- Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)