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O26 Tephra

Abbr.: O26

• Tephra
• Pleistocene

• Lithofacies (Upper): Scoria silt
• Lithofacies (Lower): Tuff (3 fall units or less)
• Sedimentary structures (Lower): Graded bedding

• Thickness: 14 - 58 cm
• Thickness (Upper): 3 - 5 cm
• Thickness (Lower): 11 - 53 cm
• Host: Otadai Formation, Ofuna Formation

• Distribution: Okawasaki - Honoki, Futtsu city, 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.)
• 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.)