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Iizuna Pyroclastic Flow Deposit Hayatsu, 1985

Invalid synonym: Gairinzankoki Tuff Breccia, Iizuna proper strato-volcanic products

• Type locality: Iizunahigashi highland, Nagano city, Nagano prefecture
• Volcanic rocks
• Pleistocene

• Lithofacies: Pyroclastic flow deposit (Multiple flow units)
• Lithofacies: Block-and-ash flow deposit
• Lithofacies: Scoriaceous flow deposit

• Thickness: ca. 100 m
• Upper limit: Unconformity (IZ-FM, Iizuna Volcanic-Fan Deposit, Shimizu Formation, Fujimiyama Lava)
• Lower limit: Unconformity (Hiderida Formation, Mure Debris Avalanche Deposit)

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

• Distribution: Iizunahigashi highland, Nagano city, Nagano pref.; Mure, Iizuna city, Kamiminochi county, Nagano pref.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)