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Mizunagasawayama Welded Tuff Formation Kobayashi et al., 1976

• Volcanic rocks
• end of Miocene - Pliocene

• Lithofacies: Augite dacitic welded tuff

• Thickness: ca. 150 - 200 m
• Lower limit: Unconformity (Okutone Group, Makihatayama Granodiorite)

• Distribution: Mount Mizunagasawa - Mount Echigosawa - Mount Ozawadake - Mount Mitsuishi, Minakami city, Tone county, Gunma pref.

• Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)