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Nb 1 Tephra

Abbr.: Nb 1

• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash

• Thickness: 20 cm
• Host: Iimuro Formation

• Distribution: Noborito, Tama ward, Kawasaki city, Kanagawa pref.; Hiyoshi, Kohoku 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.)