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O4 Tephra

Abbr.: O4

• Tephra
• Pleistocene
• Correlation: O-kb1, TR-3A

• Lithofacies: Vitreous tephra

• Host: Otadai Formation
• Thickness: 5 cm or thinner

• Distribution: Yagami, Misaki town, Isumi city, Chiba pref.

• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)