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Nakanotake Metagabbros Chihara et al., 1976

• Plutonic rocks
• Ophiolite
• Paleozoic - Triassic
• Intruded by: Daikura Granite, Cretaceous granites, Porphyrite, Metadiabase, Quartz porphyry, Rhyolite, Dacite

• Lithofacies (Upper): Hornblende gabbro
• Lithofacies (Upper, Minor): Dunite, Peridotite, Cortlandite
• Lithofacies (Middle): Gabbro
• Lithofacies (Lower): Olivine gabbro
• Lithofacies (Lower, Minor): Cortlandite

• Distribution (East-West): ca. 15 km
• Distribution (South-North): ca. 6 km
• Upper limit: Unconformity (Sakadoyama Sandstone and Shale Member, Okura Andesite Member)

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

• Distribution: Saguri river - Udazawa river - Nonaka creek - Ikazawa river - Mount Kinjosan, Minamiuonuma city, Niigata pref.
• Deposit: Nanetsu mine

• 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.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)