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Pumice Tephra Yokoyama, 1971

Invalid synonym: Karegawa Tephra

• Type locality: Makitagawa river, Shimoyama, Kamiishizu town, Ogaki city, Gifu prefecture
• Tephra
• Pliocene - Pleistocene (1.79 Ma, FT)
• Correlation: Mushono Tephra, Kitawaki Tephra, Sugitani III Tephra, Ebs-Fkd, Shinden Tephra (Osaka Group)

• Lithofacies: Pumiceous volcanic ash
• Sedimentary structures: Graded bedding, Parallel stratification, Convolute foliation, Planar cross-stratification, Slump structure

• Host: Oizumi Formation, Lower most part of Osaka Group
• Thickness: 3 - 15 m

• Distribution: Makitagawa river, Shimoyama - Kamitara, Kamiishizu town, Ogaki city, Gifu pref.; Fujiwara town - Inabe town, Inabe city, Mie pref.; Nishikaino - Ageki - Mukohira, Hokusei town, Inabe city, Mie pref.; Kuwana city, Mie pref.; Uzunawa, Asahi city, Mie county, Mie pref.

• Yoshida et al. (2003) Geology of the Omi-Hachiman District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
• Takada et al. (1979) Geology of the Tsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 56p. (in Japanese with English abstract 5p.)
• Miyamura et al. (1976) Geology of the Hikonetobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 6p.)
• Huzita and Kasama (1982) Geology of the Osaka-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 8p.)