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Nishigo Pyroclastic Flow Deposit

Invalid synonym: Nn4 Pyroclastic Flow Deposit, Kuromoritoge Tuff

• Volcanic rocks
• Caldera-overflow pyroclastic deposit
• Pleistocene (1.0 Ma, FT)

• Lithofacies: Pyroclastic flow deposit
• Lithofacies (Lower): Pyroclastic surge deposit
• Lithofacies: Orthopyroxene clinopyroxene hornblende dacite
• Lithofacies: Pumiceous tuff breccia, Pumice lapilli tuff
• Lithofacies (Lower): Volcanic ash

• Source: Narioka caldera
• Host: Nanaorezaka Formation, Sakaibayashi Formation
• Thickness: 20 - 150 m or thicker

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kannon river, Osawa - Komatsugawa, Shimogo city, Minamiaizu county, Fukushima pref.; Koyama, Habuto, Nishigo city, Nishishirakawa county, Fukushima pref.

• Suzuki (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.121-133 DOI
• Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
• Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)
• Yamamoto and Yoshioka (1992) Geology of the Wakamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)