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Ontake-Byakubi Tephra

Abbr.: On-Byk

Synonym: Byk-E, Ku2.3, TNTT

• Tephra
• Pleistocene (0.77 Ma)
• Correlation: YUT5

• Lithofacies: Vitreous volcanic ash

• Source: older Ontake volcano, Nagano pref., Japan
• Host: Kokumoto Formation

• Distribution: Obuta, Chonan city, Chosei county, Chiba pref.; Baba - Sekiyatsu, Mutsuzawa city, Chosei county, 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.)