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Sojima Welded Tuff Koido and Sato, 1979
- Type locality: Sojima, Maze, Gero city, Gifu prefecture
- Volcanic rocks
- Caldera
- Late Cretaceous - Paleogene
- Lithofacies: Rhyolite - Rhyolitic dacite welded tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sojima - Hiwadatoge pass - Mazegawa river, Maze, Gero city, Gifu pref.
- Wakita and Koido (1994) Geology of the Gero District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 5p.)
- Mizutani and Koido (1992) Geology of the Kanayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)
- Kawada et al. (1988) Geology of the Hagiwara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 10p.)