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Ka2.7 Tephra (Kawai, 1952) Nanayama et al., 2016
Abbr.: Ka2.7
- Distribution: Satsubo, Chonan city, Chosei county, 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.)