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Shirakawa Akai-Kd18 Tephra

Abbr.: Sr-Aki-Kd18

Synonym: Kd18

• Tephra
• Pleistocene (1.52 - 1.46 Ma)
• Correlation: Sengen Tuff, Ob5aU3 (Choshi, Chiba), Akai Pyroclastic Flow Deposit (Fukushima), TR60 (Niigata), Tugm (Niigata)

• Source: Shirakawa, Fukushima pref., Japan
• Host: Kiwada Formation

• Distribution: Boso peninsula, Chiba pref.

• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Tamura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.23-39 DOI