[ Top ] [ Japanese ]

Mukaiyama Formation Shibata, 1953

Invalid synonym: Kitayama Formation (Lower main part), Yagiyama Formation (Lower main part), Shimoda Formation, Shionosawa Formation, Soma Formation, Kayakura Formation, Otagawa Formation

• Type locality: Hirose river, Hyojogawara, Aoba ward - Mukaiyama, Taihaku ward, Sendai city, Miyagi prefecture
• Coherent formation
• early Pliocene (3.7 - 3.4 Ma, Paleomagnetic)
• Contemporaneous heterotopic facies: Sanbongi Formation
• Correlation: Omotezawa Formation, Kuboma Formation?

• Sedimentary facies: Fluvial, Brackish
• Sedimentary facies (Upper): Estuary
• Sedimentary facies (Upper): Lagoon
• Sedimentary facies (Lower): Meandering river
• Sedimentary facies (Lower): Lacustrine in backmarsh
• Sedimentary facies (Lower, Minor): Braided river
• Lithofacies (Upper): Sandstone, Siltstone, Tuff, Lignite
• Lithofacies (Lower): Sandstone, Siltstone, Lignite
• Lithofacies (Lower, Minor): Conglomerate, Felsic tuff
• Sedimentary structures (Upper): Bioturbation
• Sedimentary structures (Lower): Trough cross-stratification, Imbrication

• Thickness: 20 - 220 m
• Thickness (Upper): 20 - 30 m
• Thickness (Lower): ca. 0.5 - 8 m
• Upper limit: Bottom of the marine sandstone horizon overlying interbedded mudstone and sandstone
• Upper limit: Conformity, partly unconformity (Dainenji Formation), Unconformity (Dainohara Terrace Deposit)
• Lower limit: Unconformity (Tatsunokuchi Formation, Tochikubo Formation, Akashiba Formation, Goyasu Formation, Mizunoya Formation), Abut unconformity (Mitaki Formation)

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

• Distribution: Hyojogawara - Kamiaishi - Shionosawa - Dainohara, Aoba ward, Sendai city, Miyagi pref.; Mukaiyama, Taihaku ward, Sendai city, Miyagi pref.; Nishitanaka - Yakegawara, Izumi ward, Sendai city, Miyagi pref.; Natori river, Kumanodo, Takadate, Natori city, MIyagi pref.; Azukishima, Natori city, Miyagi pref.; Iwanuma city, Miyagi pref.; Namie city - Tomioka city, Futaba county, Fukushima pref.; Fukano, Haramachi ward, Minamisoma city, Fukushima pref., Hatsuno, Soma city, Fukushima pref.; Ota river, Katakura, Haramachi ward, Minamisoma city, Fukushima pref.; Yashiki - Yamadorisaku, Haramachi ward, Minamisoma city, Fukushima pref.; Kawabusa river, Kitanouchi, Odaka ward, Minamisoma city, Fukushima pref.; Murohara - Takakura, Namie city, Futaba county, Fukushima pref.; Ishikuma, Okuma city, Futaba county, Fukushima pref.
• Fossils: Marine shellfishes, Freshwater - brackish diatoms

• Miyamoto et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.27-46 DOI
• Fujiwara et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.96-119 DOI
• Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
• Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)
• Kubo et al. (1994) Geology of the Namie and Iwaki-Tomioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 7p.)
• Kubo et al. (1990) Geology of the Haramachi and Omika District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
• Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)
• 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.)
• Oide and Fujita (1975) Geology of the Iwanuma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)