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Nigorigo volcano

Invalid synonym: Sengendaru Lava

• Type locality: Shintani valley, Osaka town, Gero city, Gifu prefecture
• Volcanic rocks
• late Pleistocene (ca. 80 ka, K-Ar)

• Lithofacies (Upper): Augite hypersthene andesite, Hornblende-bearing augite hypersthene andesite
• Lithofacies (Lower): Hypersthene olivine augite basaltic andesite
• Lithofacies (Upper): Lava, Scoria agglomerate, Pyroclastic rocks, Pyroclastic flow deposit
• Lithofacies (Lower): Scoria agglomerate
• Lithofacies (Lower, Minor): Sands

• Source: upper reaches of Shintani valley
• Thickness: ca. 50 - 150 m
• Upper limit: Unconformity (Kusakidani volcano)
• Lower limit: Unconformity (Mamahahadake volcano group)

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

• Distribution: Shintani valley - Iozawa creek - Kusakidani valley - Nigorigogaw river - Nigorigo hotspring - Oiwake - Hatasakodani valley - Ochiai, Osaka town, Gero city, Gifu pref.; Sengendarusawa creek, Takane town, Takayama city, Gifu pref.

• Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
• 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.)