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Tr 4 Tephra
Abbr.: Tr 4
- Lithofacies: Vitreous tephra
- Distribution: Kamimiwa, Miwa town, Machida city, Tokyo
- 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.)