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Yb3 Tephra Tokuhashi and Endo, 1984

Abbr.: Yb3

Invalid synonym: SY

• Tephra
• Pleistocene

• Lithofacies (Upper): Pumice
• Lithofacies (Middle): Pumice
• Lithofacies (Lower): Volcanic ash

• Host: Yabu Formation
• Thickness (Upper): ca. 30 cm
• Thickness (Middle): ca. 10 cm
• Thickness (Lower): 3 cm

• Distribution: Yado, Kisarazu city, Chiba pref.; Kaigarazaka slope, Nagai, Kisarazu city, Chiba pref.; Semata, Ichihara city, Chiba pref.

• Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)