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O18 Tephra
Abbr.: O18
- Lithofacies (Upper): Scoria tuff
- Lithofacies (Middle): Tuff (2 fall units)
- Lithofacies (Lower): Tuff (2 fall units)
- Host: Otadai Formation
- Thickness (Upper): 1 - 2 cm
- Thickness (Middle): 2 - 4 cm
- Thickness (Lower): 13 - 23 cm
- O18 Tephra
- [ Upper ]
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- Upper
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- Middle
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- JA-O18L
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Honoki, Futtsu city, 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.)
- 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.)