Abstract
As a rusult of the writers, surbey, the so-called "Taga Series" developed in the neighbourhood of Hitachi City, Ibaraki Pref., has been divided into the following formations : Tertiary Upper Pliocene Hatsuzaki group Lower Pliocene Taga group Hanareyama tuff member? Hitachi sandy shale member Uppermost Miocene Kawarago formation The Kawarago formation is overlain by the Hitachi sandy shale member with a clino-unconformity., The former belongs to the Uppermost Miocene, while the latter to the Lower Pliocene., As the so-called "Taga Series" is consisted of two parts different in age and structure, it becomes necessary to re-examine the stratigraphy of all the "Taga Series" in the eastern district of Abukuma Plateau.,
