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Ks13 Tephra
Abbr.: Ks13
- Distribution: Shibuya tunnel, Mobara city, Chiba pref.
- Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)