Abstract
During the Lower and Middle Miocene, the marine sediments which consist of green tuff, mud, sand and lava had been formed throughout the Green Tuff Area of the Southern part of Tohoku District, Japan. The uplifting movements characterized by the tilting or flexure with the axis of NW-SE or N-S direction were caused in the several parts during the Late Miocene, and consequently the inland basins (i. g. the Palaeo-Aizu Basin) were formed. The terrestrial sediments had been formed in these inland basins from the Upper Miocene to Lower Pleistocene, though the basins more or less migrated through these ages. These sediments were transformed by the tectonic movements during the latter half of Early Pleistocene or the early half of the Middle Pleistocene. The subsiding movement which may be caused by the depression or flexure began anew crossing with the inland basins mentioned above during the Middle Pleistocene. This movement formed the recent basins which are represented by the Aizu, Koriyama and Fukushima Basins. The volcanic activities changed in the nature and situation with the changes of the sedimentary basins since the Miocene.
