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Chokai volcano

• Type locality: Mount Chokai, Yamagata prefecture - Akita prefecture
• Stratovolcano
• Volcanic rocks
• Pleistocene - Holocene (ca. 0.6 - 0.0 Ma)

• Lithofacies: Hypersthene augite andesite lava, Pyroclastic rocks

• Eruptive volume: 72.8 km³
• Eruptive volume (Remaining): 67.2 km³
• Upper limit: Unconformity (Older Fan Deposits, Kotaki Mudflow Deposits, Older Sand Dune Deposit)
• Lower limit: Unconformity (Nishime Formation, Onnagawa Formation, Funagawa Formation, Sasaoka Formation, Tateyama Formation, Maruyama Formation, Kannonji Formation, Shonai Group)

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

• Distribution: Mount Chokai, Yamagata - Akita pref.
• Distribution: Koyoshi river, Yurihonjo city, 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.)
• Ozawa et al. (1982) Geology of the Kisakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 4p.)
• Ikebe et al. (1979) Geology of the Sakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 3p.)