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Oyama Quartz Syenite Chiba et al., 2000

• Type locality: Oyama dam, Nishinoshima city, Oki county, Shimane prefecture
• Plutonic rocks
• Miocene (before ca. 7 Ma; 7.02 - 6.18 Ma, K-Ar)
• Intruded by: Takuhiyama Pyroclastic Cone
• Intruded in: Mita Formation, Otsu Formation

• Lithofacies: Quartz syenite
• Lithofacies (Minor): Syenite porphyry

• Distribution (East - West): ca. 2 km
• Distribution (South - North): ca. 2 km
• Upper limit: Unconformity (Takuhiyama Pyroclastic Cone)

• Distribution: Oyama dam, Nishinoshima city, Oki county, Shimane pref.

• Chiba et al. (2000) Geology of the Urago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 3p.)