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Koyashiro Tephra Miyamura et al., 1981

• Type locality: Onbegawa river, Koyashiro town, Suzuka city, Mie prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Volcanic ash

• Host: Sakuramura Formation
• Thickness: 150 cm

• Distribution: Koyashiro town - Ueno, Suzuka city, Mie pref.

• Miyamura et al. (1981) Geology of the Kameyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 9p.)