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Yaoroshi Tuff Kaji Research Group, 1980

• Tephra
• Pliocene (2.5 Ma, FT)

• Lithofacies: Pumiceous tephra

• Thickness: 30 cm
• Host: Hanno Formation

• Distribution: Irumagawa river, Yaoroshi, Hanno city, Saitama pref.

• Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)