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Yk Tephra

Abbr.: Yk

• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash

• Thickness: 5 cm
• Host: Iimuro Formation

• Distribution: Iimuro, Tama ward, Kawasaki city, Kanagawa pref.; Shinishikawa, Midori ward, Yokohama city, Kanagawa pref.

• Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)