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Otakizawa Pumiceous Volcaniclastic Rocks (Kato et al., 1958) Nagamori et al., 2013

Invalid synonym: Otakizawa Formation

• Type locality: Otaki creek, Shinjo river, Aomori city, Aomori prefecture
• Volcanic rocks
• late Pliocene (2.9, 2.6 Ma, FT)
• Contemporaneous heterotopic facies: Lower Isodayama Formation

• Sedimentary facies: Marine
• Lithofacies: Pumiceous tuff breccia
• Lithofacies (Top, Minor): Tuffaceous sandstone, Lapilli tuff

• Thickness: ca. 150 m

• Distribution: Otaki creek, Shinjo river, Aomori city, Aomori pref.

• Nagamori et al. (2013) Geology of the Aomori-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 67p. (in Japanese with English abstract 4p.)