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Oamamiyama Group

Invalid synonym: Oamamiyama Volcanics

• Type locality: Mount Oamami, Takayama city, Gifu prefecture
• Volcanic rocks
• Late Cretaceous

• Lithofacies (Top): Vitreous welded tuff
• Lithofacies (Upper): Rhyolite lava, Tuff
• Lithofacies (Middle): Rhyolite welded tuff
• Lithofacies (Lower): Tuff, Tuff breccia
• Lithofacies (Basal): Conglomerate

• Thickness: ca. 300 m
• Lower limit: Unconformity (Funatsu Granitic Rocks)

• Distribution: Jusanbogi pass - Osaka pass, Kokufu town, Takayama city, Takayama city, Gifu pref.; Mount Yasumineyama - Kanbara pass, Furukawa town, Hida city, Gifu pref.; Mount Kunimiyama - Mount Oamamiyama - Arakigawa river, Nyukawa town, Takayama city, Gifu pref.; Kurabashiragawa river, Kamitakara town, Takayama city, Gifu pref.
• Fossils: Aquilapllenites

• Suzuki et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.4, pp.307-322 DOI
• Nozawa et al. (1975) Geology of the Hida-Furukawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 9p.)
• Isomi and Nozawa (1957) Funatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 8p.)