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Okumarusawa Granite Harayama, 1975

• Type locality: Okumarusawa creek - Suiendani valley, Okuhidaonsengo, Takyama city, Gifu prefecture
• Plutonic rocks
• Paleocene (ca. 54, 53 Ma, Rb-Sr)
• Intruded by: Takidani Granodiorite, Suiendani Source Vent
• Intruded in: Hidarimatadani Formation, Kasagatake Rhyolites

• Lithofacies: Biotite granite
• Lithofacies (Minor): Granite porphyry, Aplite

• Upper limit: Unconformity (Yarisawa Breccia, Hotaka Andesites, Shiramizudani Pyroclastic Rocks)

• Distribution: Okumarusawa creek - Suiendani valley - Iosawa creek - Konabedani valley - Migimatadani valley - Nakasaki ridge - Hidarimatadani valley, Okuhidaonsengo, Takyama city, Gifu pref.

• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)