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Masugatayama Lava

• Volcanic rocks
• Pleistocene (2.0 Ma, K-Ar)

• Lithofacies: Basaltic andesite

• Thickness: 150 m or thicker
• Lower limit: Unconformity (Uonuma Formation)

• Distribution: Summit - Eastern flank of Mount Masugata, Minamiuonuma city, Niigata pref.

• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)