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OA Tephra

Abbr.: OA

Invalid synonym: OR

• Type locality: Komatsu forest road, Chikura town, Minamiboso city, Chiba prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies (Upper): Tuffaceous sands
• Lithofacies (Upper, Minor): Crystalline pumice
• Lithofacies (Middle): Pumice, Scoriaceous sands
• Lithofacies (Lower): Pumice
• Lithofacies (Lower, Minor): Scoria

• Host: Mera Formation
• Thickness (Upper): 1.2 m
• Thickness (Middle): 8 cm
• Thickness (Lower): 24 cm

• Distribution: Komatsu forest road, Chikura town, Minamiboso city, Chiba pref.

• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)