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Arasawadake Dacite-Quartz Porphyry Complex

• Volcanic rocks
• Hypabyssal-extrusive rock complex
• Pliocene (4.3 Ma)

• Lithofacies (Exntrusive facies): Dacite (7 - 8 units)
• Lithofacies (Intrusive facies): Intrusive breccia, Quartz porphyry
• Lithofacies (Basal): Conglomerate

• Distribution (East-West): 9 km
• Distribution (South-North): 5.5 km
• Lower limit: Unconformity (Granite, Okutone Group)

• Distribution: Mount Arasawa - Mount Hainomata, Uonuma city, Niigata pref.

• Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)