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Kumi Formation

• Coherent formation
• Miocene (16.5 - 9.5 Ma)
• Intruded by: Trachyte

• Lithofacies (Upper): Mudstone
• Lithofacies (Upper, Minor): Diatomite
• Lithofacies (Lower): Sandstone-dominant interbedded sandstone and mudstone

• Upper limit: Unconformity (Tsuma Formation, Omosu Formation, Mukogaoka Formation)
• Lower limit: Unconformity (Kori Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Utagi, Okinoshima city, Oki county, Shimane pref.
• Fossils (Foraminifera): Lenticulina sp., Miogypsina sp., Operculina sp., Sphaerogypsina sp.

• 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.)