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O5 Tephra

Abbr.: O5

• Tephra
• Pleistocene

• Lithofacies (Upper): Pumice
• Lithofacies (Lower): Crystalline volcanic ash

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

• Distribution: Enokisawa, 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.)