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Ongata Tephra

• Tephra
• Pliocene (1.7 Ma, FT)

• Lithofacies: Pumiceous tephra

• Thickness: 20 cm
• Host: Ongata Formation

• Distribution: Kawamachi town, Hachioji city, Tokyo

• 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.)