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Chohanyama Lava

• Volcanic rocks
• Pliocene
• Correlation: Togakushiyama Formation?

• Sedimentary facies: Hyaloclastite
• Lithofacies: Olivine-bearing pyroxene andesite

• Distribution: Mount Chohan, Nojiri, Shinano city, Kamiminochi county, Nagano pref.; Mount Masugata, Nagano city, Nagano pref.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)