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Shoheizugawa Pumiceous Volcaniclastic Rocks Nagamori et al., 2013

A part of Nijikai Formation?

• Type locality: Aizawa, Namioka, Aomori city, Aomori prefecture
• Volcanic rocks
• early Pleistocene (2.4 Ma, FT, Diatoms)
• Contemporaneous heterotopic facies: Lower Isodayama Formation

• Sedimentary facies: Marine
• Sedimentary facies: Turbidite
• Sedimentary facies (Tuff): Turbidite dust
• Lithofacies: Pumiceous tuff breccia (Hornbelnde crystals are included.)
• Lithofacies (Upper, Minor): Tuff

• Thickness: ca. 10 - 250 m

• Distribution: Aizawa, Namioka, Aomori city, Aomori pref.; Mount Tomori, Kareizawa, Namioka, Aomori city, Aomori pref.
• Fossils: Diatoms

• 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.)