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Yt-Kw Tephra
Abbr.: Yt-Kw
- Distribution: Mameyaki bridge, Otaki, Chichibu city, Saitama pref.
- Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)