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U-Oki Tephra
Abbr.: U-Oki
- Tephra
- Pleistocene (10.0 ka, Ar-Ar; 10.7 ka, Lake Suigetsu core)
- Source: Ulleung-do island, Korea
- Distribution: east Chugoku region - Kanto region, Honshu island, Japan
- Okuno (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.41-53 DOI