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Taga Group (Suzuki, 1954) Ando et al., 2011

Kokozura Formation is recognized as a member of Takaku Group, and the upper part of Taga Group is separated as Hitachi Group.

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