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Hikodani Welded Tuff

• Volcanic rocks
• Caldera
• Late Cretaceous - Paleogene
• Intruded by: Granodiorite porphyry, Granite porphyry

• Lithofacies: Rhyolite - Dacite welded tuff
• Lithofacies (Minor): Hornfels

• Source: Hikodani valley or northern area of Hikodani valley
• Thickness: 500 m or thicker
• Upper limit: Unconformity (Tsumetadani Formation, Akadani Welded Tuff, Genjidake Welded Tuff, Nyukawa Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Yamanokuchigawa Welded Tuff, Nihongi Formation, Koidodani Formation, Mitarai Formation, Mugishima Granite)

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

• Distribution: Kawakamigawa river - Miyagawa river - Mitadani valley - Hikodani valley - Makiguchi - Natsumaya - Odoritoge pass, Kiyomi town, Takayama city, Gifu pref.; Maeharadani valley, Yokamachi town, Takayama city, Gifu pref.

• 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.)