[ Top ] [ Japanese ]

Shirado Group (Nakamura, 1913) Nemoto et al., 1996

Invalid synonym: Nakayama Formation

• Type locality: Minamishirado, Taira, Iwaki city, Fukushima prefecture
• Coherent formation
• southern Yezo Forearc basin (Jobanoki basin)
• early Miocene
• Correlation: Sukohata Siliciclastic Rock Member

• Sedimentary facies: Marine, Fluvial

• Thickness: ca. 50 - 170 m
• Upper limit: Unconformity (Takaku Group, Sendai Group, Taga Group)
• Lower limit (East): Conformity (Yunagaya Group)
• Lower limit (West): Unconformity (Misawa Formation, Honya Formation, Kamenoo Formation, Mizunoya Formation, Goyasu Formation)

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

• Distribution: Minamishirado, Taira, Iwaki city, Fukushima pref.; Yusuji seashore, Hirono city, Futaba county, 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.)
• 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.)
• Iwao and Matsui (1961) Taira and Kawamae, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 17p.)