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Muko-ga-oka Formation Yamauchi et al., 2005

• Type locality: Mukogaoka, Okinoshima city, Oki county, Shimane prefecture
• Coherent formation
• Pliocene

• Sedimentary facies (Upper): Fluvial
• Sedimentary facies (Lower): Marine
• Sedimentary facies (Lower): Inner bay
• Sedimentary facies: Debris flow deposit
• Lithofacies (Upper): Sands, Gravels, Gravel-bearing mud, Mud, Clay
• Lithofacies (Upper, Minor): Basalt lava, Pillow lava
• Lithofacies (Middle): Clay
• Lithofacies (Middle, Minor): Sands, Gravels
• Lithofacies (Lower): Conglomerate
• Lithofacies (Lower, Minor): Mud, Sands

• Thickness: ca. 40 - 90 m
• Upper limit: Conformity (Omineyama Basalt, Daimanjisan Basalt, Soramineyama Basalt, Kama Basalt)
• Lower limit: Unconformity (Kumi Formation, Kori Formation, Omosu Formation, Tsuzurao Formation, Oki Metamorphic Rocks)

• Distribution: Mukogaoka - Mount Omineyama - Mount Daimanjisan - Mount Soramineyama - Kaminagu - Ozuku - Tsuma - Utagi, 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.)