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Stage IIIa
- Type locality: Mount Chokai, Yamagata prefecture - Akita prefecture
- Stratovolcano
- East Chokai edifice and flank volcano
- Volcanic rocks
- Pleistocene - Holocene (ca. 0.02 Ma - 2.5? ka)
- Stage IIIa
- [ Upper ]
- ~~~~~~~~~~~~~~
- Saruana Lava
- ~~~~~~~~~~~~~~
- [ 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.)