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Somanakamura Group (Masatani, 1950) Mori, 1963

Invalid synonym: Soma Group

• Coherent formation
• Middle Jurassic - Early Cretaceous

• Sedimentary facies: Shallow marine, Fluvial
• Depth of water: Coastal
• Lithofacies: Sandstone, Shale
• Lithofacies (Minor): Conglomerate, Limestone

• Thickness: 2,300 m
• Distribution (East - West): 3 -4 km
• Distribution (South - North): 27 km
• Upper limit: Unconformity (Tatsunokuchi Formation, Mukaiyama Formation)
• Lower limit: Unconformity (Karosan Formation)

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

• Distribution: Soma city - Minamisoma city, Fukushima pref.

• Taketani and Osozawa (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.68-81 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. (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.)
• Fujita et al. (1988) Geology of the Kakuda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 99p. (in Japanese with English abstract 9p.)