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Hakkoda-Kokumoto Tephra

Abbr.: Hkd-Ku

Synonym: Ku1

• Tephra
• Pleistocene (0.76 Ma; 0.7 Ma, FT)
• Correlation: OT21 (Oga, Akita), Yk9a (Choshi, Chiba), Hkd1, Imakuma I

• Source: Hakkoda caldera, Aomori pref., Japan
• Host: Kokumoto 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
• 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.)
• Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)