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Nonomigawa Pyroclastic Rock Member Shimazu et al., 1976

Invalid synonym: Nonomigawa Volcanic Rocks, Kuwanagawa Volcanic Rocks, Hotokegamine Formation

Some researchers consider as a part of Naradate Formation.

• Type locality: Nonomi river, Nishiotaki, Iiyama city, Nagano prefecture
• Volcanic rocks
• early Pleistocene (1.6 - 1.1 Ma; 1.55, 1.16, 0.7 Ma, FT)
• Correlation: Nakajogawa Member, Kenashiyama volcano

• Sedimentary facies: Terrestrial
• Lithofacies: Augite hypersthene andesite volcanic breccia, Tuff breccia, Lava
• Lithofacies (Minor): Felsic tuff, Sandstone, Mudstone

• Thickness: 1,000 m
• Lower limit: Conformity, Interfingered (Main part of Ogawa Formation)

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

• Distribution: Nonomi river, Nishiotaki, Iiyama city, Nagano pref.; Chikuma river - Hotokegamine - Mount Kuroiwa - Tomikura pass - Io - Yashiki, Iiyama city, Nagano pref.

• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)