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Iidesan Granodiorite Takahashi et al., 1996

• Plutonic rocks
• late Cretaceous - Paleogene (51.3 Ma, K-Ar)
• Intruded by: Granophyre, Rhyolite dikes, Basaltic - andesitic pyroclastic dikes
• Intruded in: Ashio Belt

• Lithofacies: Hornblende biotite granodiorite, Quartz diorite

• Upper limit: Unconformity (Meganebashi Formation)

• Distribution: Mount Iide, Fukushima pref. - Niigata pref. - Yamagata pref.; Mount Eboshi - Mount Dainichi - Mount Onishidake - Mount Jizodake, Niigata pref. - Yamagata pref.; Sanekawa river, Aga city, Higashikanbara county, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)
• Yanagisawa and Yamamoto (1998) Geology of the Tamaniwa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
• Takahashi et al. (1996) Geology of the Iidesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 3p.)