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Onagi Welded Tuff
- Tephra
- Pleistocene - Holocene
- Sedimentary facies: Pyroclastic flow deposit
- Lithofacies: Welded tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: west - northwest of Mount Nantai, Nikko city, Tochigi pref.
- Kawata (1955) Nantaizan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 7p.)