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Tsunozu Group (Imamura, 1957) Sanin Quaternary Research Group, 1969
Invalid synonym: Oya Group, Oe Group, Gotsu Group
- Type locality: Tsunozu, Gotsu city, Shimane prefecture
- Coherent formation
- Pliocene - middle Pleistocene
- Intruded by: Kawamoto Minette
- Sedimentary facies: Marine, Freshwater
- Sedimentary facies (Upper): Sand dune, Seashore
- Sedimentary facies (Middle): Fluvial
- Sedimentary facies (Lower): Seashore
- Sedimentary facies (Lower): Lagoon and Shoreface under the influence of rivers
- Lithofacies (Upper): Sands
- Lithofacies (Middle): Gravels
- Lithofacies (Lower): Sands, Gravels, Mud
- Thickness: 10 - 170 m or thinner
- Upper limit: Unconformity (Kawamoto Minette)
- Lower limit: Unconformity (Togane Formation, Omori Formation, Gotsu Volcanic Rocks, Arifuku Quartz Diorite, Mihara body, Yakami body, Komatsuji Formation, Minamiyama Dikes, Toburodani Formation, Kozogawa Volcanic Rocks, Kawai Formation, Kuri Formation, Ochi Group, Onbara Granite)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tsunozu, Gotsu city, Shimane pref.; Yunotsu - Hane town - Shizuma town, Oda city, Shimane pref.; Hamada city, Shimane pref.; Oura, Oda city, Shimane pref.; Hatano, Kawamoto city, Ochi county, Shimane pref.; Mount Mengameyama, Iinan city, Iishi county, Shimane pref. - Miyoshi city, Hiroshima pref.
- Takahashi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.9, pp.474-492 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.)
- Matsuura (1990) Geology of the Akana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (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.)