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Okumatashiro Granite Harayama, 1979

• Type locality: Okumatashirodani valley, Kamikochi, Azumi, Matsumoto city, Nagano prefecture
• Plutonic rocks
• Early Cretaceous - Paleogene (59.3 Ma, K-Ar)
• Intruded by: Byobunoatama Granophyre, Pyroclastic rock dyke, Andesite dykes
• Intruded in: Sawando Complex
• Correlation: Ichinosawa Granite

• Lithofacies: Hornblende-bearing biotite granite, Biotite granite
• Lithofacies (Minor): Aplite

• Upper limit: Unconformity (Yarisawa Breccia, Maehotakadake Welded Tuff)

• Distribution: Okumatashirodani valley - Sakamaki hotspring - Ubuyasawa creek - Mount Kasumizawadake - Myojin - Byobuiw - Ichinomatadani valley - Ninomatadani valley - Yarisawa creek, Azumi, Matsumoto city, Nagano pref.

• Harayama (2015) Jour. Geol. Soc. Japan, vol.121, no.10, pp.373-389, DOI
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)