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Takashibiyama Formation, Kano and Yoshida, 1985

• Type locality: Chikumi - Tako - Kaka - Nonami - Mount Takashibiyama, Matsue city, Shimane prefecture
• Volcanic rocks
• Submarine volcano complex
• Miocene (14.0 - 12.0 Ma)
• Correlation: Matsue Formation
• Intruded by: Porphyrite dikes

• Sedimentary facies (Upper): Gravity flow deposits
• Sedimentary facies (Lower): Gravity flow deposits, Subqqueous pyroclastic flow deposits
• Lithofacies: Tholeiite
• Lithofacies (Upper): Basalt - Andesite hyaloclastite, Lava, Tuff breccia
• Lithofacies (Middle): Andesite - Dacite hyaloclastite, Pillow lava, Volcanic breccia, Tuff breccia, Tuff
• Lithofacies (Lower): Andesite - Dacite tuff breccia, Tuff
• Lithofacies (Lower, Minor): Mudstone
• Sedimentary structures (Lower): Graded bedding, Parallel stratification, Slump structure

• Source (Lower): Katsurajima island
• Thickness: 1,300 - 1,500 m
• Lower limit: Conformity (Furue Formation)

• Distribution: Chikumi - Tako - Kaka - Nonami - Mount Takashibiyama - Kasaura, Matsue city, Shimane pref.
• Fossils (Shellfishes): Cardiomya sp., Dosinia sp., Glycymeris sp., Nemocardium sp., Palliolum sp., Pancturella sp., family Pectinidae
• Fossils (Foraminifera): Cribrostomoides cf. crassimargo
• Fossils: Trace fossils

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Utada (2007) Jour. Geol. Soc. Japan, vol.113, no.8, pp.438-453 DOI
• Kano and Yoshida (1985) Geology of the Sakaiminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)