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Okutadami Green Tuff Formation

• Volcanic rocks
• Miocene
• Intruded by: Ryolite dikes

• Lithofacies: Dacite tuff, Sandy tuff, Lapilli tuff, Pumiceous tuff breccia
• Lithofacies (Basal): Conglomerate

• Lower limit: Unconformity (Granite)

• Distribution: Lake Okutadami, Uonuma city, Niigata pref. - Hinoemata city, Minamiaizu county, Fukushima pref.; Tadami river - Kitanomata river - Koinomata river, Uonuma city, Niigata 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.)