PALYNOLOGICAL STUDIES ON THE RECONSTRUCTION OF THE PAST VEGETATION MAP IN HAKKODA MOUNTAINS : WITH SPECIAL REFERENCE TO THE PERIOD JUST BEFORE THE TOWADA-A ASH FALL

Abstract

In order to determine to the same time zone of the past in Hakkoda Mountains, Aomori prefecture, the horizon of tephra layers in 24 pollen diagrams were compared. From this horizon, isopollen map, displaying the distributional pattern of pollen was drawn, and based on these results the past vegetation map at the period just before the Towada-a ash fall in Hakkoda Mountains was drawn.