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Iwatakeyama Welded Tuff (Hirabayashi, 1996) Nakano et al., 2002

• Type locality: Mount Iwatakeyama, Hakuba city, Kitaazumi county, Nagano prefecture
• Tephra
• Pliocene
• Correlation: Horinouchi Member, Mikkaichiba Welded Tuff

• Lithofacies: Biotite dacite welded tuff

• Thickness: 280 - 300 m or thicker
• Lower limit: Unconformity

• Distribution: Mount Iwatakeyama - Mount Yazakiyama, Hakuba city, Kitaazumi county, Nagano pref.

• Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)