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Toburodani Formation Hattori et al., 1983

Invalid synonym: Kimidani Group

• Type locality: Toburodani, Misato city, Ochi county, Shimane prefecture
• Volcanic rocks
• late Oligocene - early Miocene (24.5, 22.9 Ma, FT)
• Intruded by: Minamiyama Dikes, Makihara Complex

• Sedimentary facies: Terrestrial
• Lithofacies (Upper): Andesite hyaloclastite, Volcanic breccia, Volcanic conglomerate, Lithic lapilli tuff, Agglutinate
• Lithofacies (Lower): Dacite - Andesite Tuff breccia, Tuff
• Lithofacies (Minor): Tuffaceous sandstone, Mudstone
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Doubly-graded bedding

• Thickness: ca. 600 m
• Upper limit: Unconformity (Hata Formation, Tsunozu Group)
• Lower limit: Unconformity (Komatsuji Formation), Abut unconformity (Yugakaigawa Volcanic Rocks, Takayama Volcanic Rocks)

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Toburodani - Kyoranbra - Beppu, Misato city, Ochi county, Shimane pref.; Komatsubara, Oda city, Shimane pref.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Kano et al. (2001) Geology of the Yunotsu and Gotsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 129p. (in Japanese with English abstract 5p.)
• Kano et al. (1998) Geology of the Iwami-Oda and Oura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 118p. (in Japanese with English abstract 5p.)
• Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)