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Fr Tephra
Abbr.: Fr
- Lithofacies: Vitreous tephra, Pumice
- Distribution: Furusawa, Aso ward, Kawasaki city, Kanagawa pref.; Fujigaoka - Ikebe town, 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.)