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Kd23 Tephra

Abbr.: Kd23

• Tephra
• Pleistocene (ca. 1.6 Ma)
• Correlation (Kd23B): Nakakochi

• Lithofacies: Tuff

• Thickness (Upper): 20 cm
• Thickness (Lower): 30 cm
• Host: Kiwada Formation, Ofuna Formation

• Distribution: Chiba pref.; Kanagawa pref.; Nojima town, Kanazawa ward, Yokohama city, Kanagawa pref.; Ofuna town, Kamakura city, Kanagawa 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.)
• Noda et al. (2017) Geology of the Kan-onji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 96p. (in Japanese with English abstract 4p.)
• Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
• Mitsunashi and Kikuchi (1982) Geology of the Yokohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 105p. (in Japanese with English abstract 4p.)