[ Top ] [ Japanese ]
Onoda Formation (Shoji, 1958) Kitamura et al., 1981
Upper part is separated as Takashimizu Formation by Matsuno (1967).
Invalid synonym: Semine Formation
- Type locality: Naruse river, Kami city (former name: Onoda city), Kami county, Miyagi prefecture
- Coherent formation
- late Pliocene - middle Pleistocene (3.3 - 0.62 Ma, FT)
- Contemporaneous heterotopic facies (Middle): Miyatoko Tuff Member
- Contemporaneous heterotopic facies (Lower): Sanbongi Formation
- Lithofacies: Tuffaceous sandstone, Siltstone, Pumice tuff Tuff
- Lithofacies (Minor): Conglomerate, Lignite
- Sedimentary structures: Cross stratification, Graded bedding, Wave ripples
- Thickness: 50 - 200 m
- Upper limit: Conformity, partly unconformity (Takashimizu Formation), Unconformity (Iketsuki Tuff, Shimoyamasato Tuff, Nizaka Tuff, Yanagisawa Tuff, Higashihara Formation)
- Lower limit: Conformity (Miyatoko Tuff Member), Unconformity (Tatsunokuchi Formation, Onomatsuzawa Formation, Kuzumine Formation, Hosokura Formation, Odogamori Formation)
- Distribution: Naruse river - Karasu river - Koyama - Tsukizaki, Kami city, Kami county, Miyagi pref.; Iwadeyama - Furukawa - Sanbongi - Eai river, Osaki city, Miyagi pref.: Hikouemon bridge, Ohira city, Kurokawa county, Miyagi pref.
- Tephra: Ot1, Ot2, Ot3, Ot4, Ot5, Ot6, Ot7
- Tsuchiya et al. (1997) Geology of the Iwagasaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 96p. (in Japanese with English abstract 4p.)
- Kitamura et al. (1983) Geology of the Yoshioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 5p.)
- Kitamura et al. (1981) Geology of the Furukawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 4p.)