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1st stage Nagamori et al., 2003

• Type locality: Caldera of Mount Iizuna, Nagano prefecture
• Volcanic rocks
• Pleistocene (0.34 Ma, K-Ar; ca. 0.35 Ma or later)

• Sedimentary facies: Lava flow, Pyroclastic rocks, Pyroclastic flow deposit, Pyroclastic fall deposit
• Sedimentary facies (Minor): Debris avalanche deposit
• Lithofacies: Hornblende hypersthene andesite
• Lithofacies (Minor): Basalt, Hornblende andesite, Dacite

• Thickness: 200 m or thicker
• Upper limit: Unconformity (Iizuna Basalts)

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

• Distribution: Caldera of Mount Iizuna, Nagano pref.; Mount Meno, Nagano city, 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.)