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Sequence IV

Invalid synonym: Stage III

• Volcanic rocks
• Caldera
• Late Cretaceous - Paleogene (ca. 65 Ma, FT, 71.5 Ma, K-Ar)
• Intruded by: Iwase Granodiorite Porphyry, Sami-Kadowasa Parallel Dike Swarm

• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Rhyolite welded tuff

• Lower limit: Unconformity (Dokyo Granodiorite Porphyry)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Gifu pref. - Fukui pref. - Toyama 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.)
• Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (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.)
• Yamada et al. (1985) Geology of the Takayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)
• Kawada (1982) Geology of the Mikkamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 6p.)