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Hongogawa Pumiceous Volcaniclastic Rocks Nagamori et al., 2013

• Type locality: Hongo river, Yunosawa, Aomori city, Aomori prefecture
• Volcanic rocks
• early Pleistocene (younger than 1.5 Ma)
• Contemporaneous heterotopic facies: Upper Isodayama Formation

• Sedimentary facies: Shallow marine
• Sedimentary facies (Upper): Reworked
• Lithofacies: Pumiceous tuff breccia
• Sedimentary structures: Parallel stratification

• Thickness: 140 m or thinner
• Source: Okiura caldera

• Distribution: Yunosawa - Mount Tengudaira, 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.)