Stage III

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Stage III

Type locality: Mount Chokai, Yamagata prefecture - Akita prefecture
Stratovolcano
East Chokai edifice
Volcanic rocks
Pleistocene - Holocene (ca. 0.02 - 0.0 Ma)

Lithofacies: Calc-alkaline andesite

Eruptive volume: 4.3 km³

Stage III
[ Upper ]
+__+__+__+__+_
Stage IIIb
~~~~~~~~~~~~~~
Kisakata Debris Avalanche Deposit
~~~~~~~~~~~~~~
Stage IIIa
~~~~~~~~~~~~~~
[ Lower ]

Chokai volcano
[ Upper ]
+__+__+__+__+_
Stage III
~~~~~~~~~~~~~~
Stage II
~~~~~~~~~~~~~~
Stage I
~~~~~~~~~~~~~~
[ 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.)
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.)