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Yb1 Tephra Tokuhashi and Endo, 1984

Abbr.: Yb1

• Tephra
• Pleistocene

• Lithofacies: Volcnic ash
• Sedimentary structures: Graded bedding

• Host: Yabu Formation
• Thickness: ca. 6 cm

• Distribution: Jizodo, Kisarazu city, Chiba pref.; Ichihara Chuo Highschool, Tsuchiu, Ichihara city, Chiba pref.; Oiwake, Nagara city, Chosei county, 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.)