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Tt4 Tephra Takeuchi and Kato, 1994
Abbr.: Tt4
- Distribution: Iida river, Yamaguchi, Maki ward, Joetsu city, Niigata pref.
- Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)