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Stage I

• Type locality: Mount Chokai, Yamagata prefecture - Akita prefecture
• Stratovolcano
• Old edifice
• Volcanic rocks
• Pleistocene (ca. 0.6 - 0.4 Ma)

• Lithofacies: Calc-alkaline andesite
• Lithofacies (Minor): High alumina basalt

• Eruptive volume: 47 km³

------ 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.)
• Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)