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Hei Trachyte Uchimizu, 1966

• Intrusive rocks
• Pliocene (5.11 Ma, Rb-Sr)
• Intruded in: Omosu Formation, Kumi Formation, Kori Formation

• Sedimentary facies: Sills
• Sedimentary facies (Minor): Dikes
• Lithofacies: Trachyte

• Thickness: 430 m

• Distribution: Hei - Minaichi - Kaminishi - Utagi - Tsubame - Chikaishigawa river - Cape Sakiyamahana - Mount Oyamamine, Okinoshima city, Oki county, Shimane pref.

• Yamauchi et al. (2009) Geology of the Saigo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 118p. (in Japanese with English abstract 3p.)