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Rikuchu Group (Onuki et al., 1960) Sugimoto, 1974

It had been defined as a member of Taro Belt. Nowadays, it is interpreted as a part of Akka-Tanohata Sub-belt in North Kitakami Belt.

• Type locality: Omoto, Iwaizumi city, Shimohei county, Iwate prefecture
• Accretionary complex
• Accretion: Jurassic

• Sedimentary facies: Marine

• Upper limit: Raga Formation

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

• Distribution: Omoto, Iwaizumi city, Shimohei county, Iwate pref.; Tanohata city, Shimohei county, Iwate pref.; Jodogahama seashore, Miyako city, Iwate pref.; Mount Junijin - Mount Osawa, Miyako city, Iwate pref.

• Umetsu et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.82-95 DOI
• Tsuchiya et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.159-179 DOI
• Yoshida and Katada (1984) Geology of the Miyako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 44p. (in Japanese with English abstract 6p.)
• Shimazu et al. (1970) Geology of the Taro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)