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Oritoyama Basalt

• Type locality: Mount Orito, Oma city, Shimokita county, Aomori prefecture
• Intrusive rock
• Miocene
• Intruded in: Oma Formation

• Lithofacies: Olivine augite basalt

• Distribution: Mount Orito, Cape Oma - Ikokuma, Oma city, Shimokita county, Aomori pref.

• Uemura (1962) Oma and Sai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 6p.)