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Yunagaya Group (Watanabe, 1926) Otuka, 1939

• Type locality: Jobankamiyunagaya town, Iwaki city, Fukushima prefecture
• Coherent formation
• southern Yezo Forearc basin (Jobanoki basin)
• early Miocene (18 - ? Ma)

• Sedimentary facies: Marine, Fluvial

• Thickness: ca. 50 - 330 m
• Upper limit: Unconformity (Taga Group, Dainenji Formation, Sodetamayama Formation)
• Upper limit (East): Conformity (Shirado Group)
• Upper limit (West): Unconformity (Shirado Group)
• Lower limit: Unconformity (Shiramizu Group, Gozaisho Metamorphic Rocks)

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

• Distribution: Jobankamiyunagaya town, Iwaki city, Fukushima pref.; Hisanohama, Hisanohama town, Iwaki city, Fukushima pref.

• Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
• Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
• 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.)
• Kano et al. (1973) Geology of the Takanuki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 109p. (in Japanese with English abstract 6p.)